Liner Plate Research Articles

Study of concrete de-bonding assessment technique for containment liner plates in nuclear power plants using ultrasonic guided wave approach

In this work, the guided wave de-bonding area-detecting technique was studied for application to containment liner plates in nuclear power plant areas. To apply this technique, an appropriate Lamb wave mode, symmetric and longitudinal dominance, was verified by the frequency shifting technique. The S0 2.7 MHz mm Lamb wave mode was chosen to realize quantitative experimental results and their visualization. Results of the bulk wave, longitudinal wave mode, and comparison experiments indicate that the wave mode was able to distinguish between the de-bonded and bonded areas. Similar to the bulk wave cases, the bonded region could be distinguished from the de-bonded region using the Lamb wave approach. The Lamb wave technique results showed significant correlation to the de-bonding area. As the de-bonding area increased, the Lamb wave energy attenuation effect decreased, which was a prominent factor in the realization of quantitative tomographic visualization. The feasibility of tomographic visualization was studied via the application of Lamb waves. The reconstruction algorithm for the probabilistic inspection of damage (RAPID) technique was applied to the containment liner plate to verify and visualize the de-bonding condition. The results obtained using the tomography image indicated that the Lamb wave-based RAPID algorithm was capable of delineating debonding areas.

Mitigating Wake Turbulence Risk During Final Approach via Plate Lines

To mitigate the risk of wake vortex encounters during final approach, so-called plate lines have been developed. Wake vortices generated by landing aircraft induce secondary vortices at the plates’ surfaces that approach the primary vortices and trigger premature wake vortex decay. Each plate line consists of several upright plates being installed underneath the approach slope. While the plate line extends perpendicular to the flight direction, its individual plates are oriented in parallel to the runway centerline. To obtain the approval of the authorities for the installation of the plate lines at runway 16 of Vienna International Airport, the plate design had to comply with airport requirements like obstacle clearance, stability, and frangibility. During a six-month campaign, wake vortex behavior of about 9500 landings with and without plates was measured simultaneously by three lidars complemented by a comprehensive suite of meteorological instrumentation. The analysis of over 1000 measured wake vortex evolutions indicates that the plate lines reduce the lifetimes of the vortices in a safety corridor along the final approach by 22–37% depending on the aircraft type. This corresponds to a reduction of vortex circulation by about 50% for the most relevant International Civil Aviation Organization separation (Medium behind Heavy).

Enhancement of wake vortex decay by air blowing from the ground

It is well-known that the long-lasted aircraft wake vortex above the airport runway jeopardizes flight safety. Therefore, the research on the enhancement of wake vortex decay is pretty much essential. The previous studies suggest that the wake decay process can be improved by introducing artificial perturbations [1]. For example, the plate lines on the ground can trigger the helical secondary vortex structures (SVS), propagating along with the primary vortices. As a result, the vortex decay will be enhanced. In the present research, active flow control methods on wake vortex decay, like air blowing or suction, are studied. Blowing/suction zones are embedded on the ground to generate airflow below the wake vortex tubes. Different sizes and shapes of the blowing/suction zones are tested. The large eddy simulation (LES) method is used to quantitatively investigate the blowing/suction effects on wake vortex decay. Furthermore, the coherent vortex structures observed and the acceleration mechanism on wake decay caused by active flow control are studied carefully. According to the present research, it is found that with a small blowing velocity (1.79 m/s) and a short blowing duration (13.15 s), the aircraft wake strength can be roughly reduced by 50% at t⁎=1. Based on the simulation results, it is revealed that the apparent effect on the wake vortex development is due to the detached vortex generated near the blowing zone rather than the blowing flow itself. Besides, a detached vortex with a scale of 0.2b0 is needed to achieve a better wake decay enhancement.

High-Precision Temperature Inversion Algorithm for Correlative Microwave Radiometer.

In order to achieve high precision from non-contact temperature measurement, the hardware structure of a broadband correlative microwave radiometer, calibration algorithm, and temperature inversion algorithm are innovatively designed in this paper. The correlative radiometer is much more sensitive than a full power radiometer, but its accuracy is challenging to improve due to relatively large phase error. In this study, an error correction algorithm is designed, which reduces the phase error from 69.08° to 4.02°. Based on integral calibration on the microwave temperature measuring system with a known radiation source, the linear relationship between the output voltage and the brightness temperature of the object is obtained. Since the metal aluminum plate, antenna, and transmission line will have a non-linear influence on the receiver system, their temperature characteristics and the brightness temperature of the object are used as the inputs of the neural network to obtain a higher accuracy of inversion temperature. The temperature prediction mean square error of a back propagation (BP) neural network is 0.629 °C, and its maximum error is 3.351 °C. This paper innovatively proposed the high-precision PSO-LM-BP temperature inversion algorithm. According to the global search ability of the particle swarm optimization (PSO) algorithm, the initial weight of the network can be determined effectively, and the Levenberg–Marquardt (LM) algorithm makes use of the second derivative information, which has higher convergence accuracy and iteration efficiency. The mean square error of the PSO-LM-BP temperature inversion algorithm is 0.002 °C, and its maximum error is 0.209 °C.

Antiglide plating for distal fibula fractures caused by supination-external rotation injury

Supination-external rotation type of fracture is the most common pattern of ankle fractures. Anatomical reduction of ankle is always desired and poor reduction usually leads to shortening of fibula, or alter the biomechanics of ankle leading to chronic pain as a result of failure of fixation always. Both lateral and antiglide plating of fibula achieve in accurate anatomical reduction of these fractures. But, maintaining the reduction until bony union is also required to avoid failure of hardware or non union. Antiglide construct enhances biomechanics strength of the fixation device due to its anti gliding effect of the applied plate upon weight bearing and thereby is more favourable. This study evaluated clinical outcomes and complications seen in fixations done by antiglide technique done during 2018-2021 among patients admitted with SER pattern injuries at our institute. A total of 24 patients were included in the study. Mean operative time in the study group was 57.5 ± 27.4 (range 20–120) minutes. The most commonly used plates were five-hole plates in 10 (42%) patients, six holed plates in 10 (42%) patients and seven holed in 4 (16%) patients. The median number of screws distal to the fracture line in the antiglide plate was 0.5 (range 0–2); 10 (50%) fibulas with no fixation, 8 (40%) with one and 2 (10%) with two screws. The AOFAS in the antiglide group performed at one year after surgery was 94.5 ± 6.0 (range 85–100).We conclude that the use of the antiglide plate in a posterolateral position, without using unreasonable distal screws, is an appropriate method of fixation in every short oblique lateral malleolus fractures occurring as a part of SER pattern injury of ankle.

Structural Integrity Evaluation of a Reactor Cavity during a Steam Explosion for External Reactor Vessel Cooling

Nuclear power is a major source of electricity in the international community. However, a significant problem with nuclear power is that, if a severe nuclear accident occurs, radiation may leak and cause great damage. As such, research on nuclear safety has become increasingly popular worldwide. In this paper, the structural integrity of a reactor cavity during a steam explosion—one kind of the aforementioned severe nuclear accidents—was evaluated. Steam explosions are primarily caused by fuel–coolant interactions (FCI), and result from issues in the cooling system that discharges the melt from the reactor core to the outside. A steam explosion can damage the nuclear power plant, and radiation leakage, the greatest concern, may occur. In the Chernobyl or Fukushima Daiichi accidents, significant radiation leakages resulted in damages extending beyond the country of origin. In this paper, a steam explosion was simulated using values given by the transient analysis code for explosive reactions (TRACER-II)—the only steam explosion code in Korea. The walls of the reactor cavity were modeled after the APR-1400 currently operating in Korea. The integrity of the concrete, rebars, and liner plate in the reactor cavity during a steam explosion was evaluated in terms of stress and ductile failure strain limits.

Defect Imaging Enhancement through Optimized Shape Factors of the RAPID Algorithm Based on Guided Wave Beam Pattern Analysis.

In this study, a modified imaging algorithm was implemented to improve the imaging accuracy for defects located on a structure. Based on analysis of the Lamb wave mode, a guided ultrasonic wave inspection technique was applied, which was able to illustrate images of defects in a 6 mm steel plate simulating containment liner plate (CLP) in nuclear power plants. The dominant Lamb wave mode was determined through short-time Fourier transform waveform analysis and imaging verification. Following tomography verification, limitations of the antisymmetric mode in the thick steel plate were identified. In addition, a modified shape factor, based on the energy distribution factor according to the beam pattern and beam width, was suggested for field applications and improved imaging accuracy. Results of the analysis revealed a beam skewing phenomenon for the Lamb wave mode. In the case of S0 2.7 MHz·mm, skewing as well as distortion effects are not observed in the experiment, while the S0 modes at 2.64 and 2.74 MHz·mm show either of them. Considering skewing width, the size of the shape function was modified. Application of the modified shape function allows us to obtain more accurate image to actual defect shape.

Mathematical Modelling of Spatial Position of 4-High Mill Housing

Nowadays with the rise of laser measure technique, the laser tracker is applied to measure and calibrate the spatial position of mill equipment in cold and hot rolling mills. How to analyze the spatial state of mill housing with the amount measured data via laser tracker is the key to the problem. However, there is still no effective model to study the spatial position of mill housing. In this paper, a comprehensive mathematical model of the spatial position of 4-high mill housing was established. The least square method was used to fit the liner plates. It can be used to calculate the spatial distance and inclination relationship of each liner plate. The model was validated by the measured data of the 4-high mill housing via laser tracker. The calculated results of the model were consistent with those of the spatial analysis software, and the relative deviation was less than 0.01%. The median and opening value and inclination state of the mill liner plates were further studied. The ability and efficiency of data analysis could be improved based on this model, which has good prospect in on-site application.

A Study of the Effect of Ligand-Metal Interactions on the Electrodeposition of Chromium from Trivalent Chromium Electrolytes

With electrolytic chromium coated steel (ECCS) technology, a thin layer of chromium and an outer layer of chromium oxide are deposited on packaging steel to provide corrosion protection and a suitable layer for adhesion of subsequent polymer coatings. In an ECCS plating line, the coating is deposited via a hexavalent chromium electrolyte. Hexavalent chromium has been found to be an environmental and health hazard and is therefore subject to restrictions under REACH legislation. A new coating process based on trivalent chromium chemistry has therefore been developed (TCCT).Coatings produced via trivalent chromium electrolytes have been found to provide comparable corrosion resistance to those achieved with the traditional Cr(VI)-based process [1]–[4]. However, there is limited understanding of the mechanism and kinetics of electrodeposition from trivalent chromium based electrolytes. This knowledge is key to optimizing process design of industrial plating lines. Formate ions are incorporated in the Cr3+ electrolyte as complexing agents to make Cr0 deposition possible. It has been shown that coating composition is dependent on the relative quantity of HCOO- ions present. The present study is comprised of two main research goals - to determine the complexes that form in solution as a function of the relative complexing agent (HCOO-) concentration and to determine the effect of this complex speciation on the deposition mechanism.Results of a multitechnique approach addressing the first of our research goals - complex speciation - will be presented. Density functional calculations have been used to establish the energetic feasibility of the reaction mechanisms suggested by results from UV Vis and FTIR spectroscopy and rotating cylinder cyclic voltammetry experiments. UV Vis and FTIR results show that a clear chemical transition occurs once the formate ion is introduced in the electrolyte – starting ratio 1:6 HCOO-:Cr3+. Beyond this point, no significant change in the spectrum apart from increasing absorbance up to a ratio of 12 HCOO-:Cr3+ is observed. These results suggest the formation of a single new complex in the solution upon introduction of the formate ion in the electrolyte solution which is not modified by further increase of the formate ion concentration.[1] M. Inman et al., ‘Green Process for Fuctional Trialent Crhromium Electroplating’, in 223rd ECS Meeting, 2012.[2] J. H. O. J. Wijenberg, M. Steegh, M. P. Aarnts, K. R. Lammers, and J. M. C. Mol, ‘Electrodeposition of mixed chromium metal-carbide-oxide coatings from a trivalent chromium-formate electrolyte without a buffering agent’, Electrochimica Acta, vol. 173, pp. 819–826, Aug. 2015.[3] J. E. Edy, H. N. McMurray, K. R. Lammers, and A. C. A. deVooys, ‘Kinetics of corrosion-driven cathodic disbondment on organic coated trivalent chromium metal-oxide-carbide coatings on steel’, Corrosion Science, vol. 157, pp. 51–61, Aug. 2019.[4] S. Hesamedini and A. Bund, ‘Trivalent chromium conversion coatings’, J Coat Technol Res, vol. 16, no. 3, pp. 623–641, May 2019.

Identification of Dendritic Cell Maturation, TLR, and TREM1 Signaling Pathways in the Brucella canis Infected Canine Macrophage Cells, DH82, Through Transcriptomic Analysis.

Research has been undertaken to understand the host immune response to Brucella canis infection because of the importance of the disease in the public health field and the clinical field. However, the previous mechanisms governing this infection have not been elucidated. Therefore, in vitro models, which mimic the in vivo infection route using a canine epithelial cell line, D17, and a canine macrophage, DH82, were established to determine these mechanisms by performing an analysis of the transcriptomes in the cells. In this study, a coculture model was constructed by using the D17 cell line and DH82 cell line in a transwell plate. Also, a single cell line culture system using DH82 was performed. After the stimulation of the cells in the two different systems infected with B. canis, the gene expression in the macrophages of the two different systems was analyzed by using RNA-sequencing (RNA-seq), and a transcriptomic analysis was performed by using the Ingenuity Pathway Analysis (IPA). Gene expression patterns were analyzed in the DH82 cell line at 2, 12, and 24 h after the stimulation with B. canis. Changes in the upregulated or downregulated genes showing 2-fold or higher were identified at each time point by comparing with the non-stimulated group. Differentially expressed genes (DEGs) between the two culture models were identified by using the IPA program. Generally, the number of genes expressed in the single cell line culture was higher than the number of genes expressed in the coculture model for all-time points. The expression levels of those genes were higher in the single cell line culture (p < 0.05). This analysis indicated that the immune response-related pathways, especially, the dendritic cell maturation, Triggering receptor expression on myeloid cells 1 (TREM1) signaling, and Toll-like receptor (TLR) signaling pathway, were significantly induced in both the culture systems with higher p-values and z-scores. An increase in the expression level of genes related to the pathways was observed over time. All pathways are commonly associated with a manifestation of pro-inflammatory cytokines and early immune responses. However, the Peroxisome proliferator-activation receptor (PPAR) signaling and Liver X Receptor/Retinoid X Receptor (LXR/RXR) signaling associated with lipid metabolism were reduced. These results indicate that early immune responses might be highly activated in B. canis infection. Therefore, these results might suggest clues to reveal the early immune response of the canine to B. canis infection, particularly TLR signaling.

Evaluation of Composite and Standard Liner Plates on Hydraulic Face Shovels Operating in Platinum Mines

Die artikel gee ’n uiteensetting van die resultate van navorsing wat gedoen is om te bepaal of die gebruik van chroom-karbied (CK) oorlegde voeringplate as ’n alternatief vir slytvaste (SV) plate aanbeveel kan word ter verlenging van die produksiesiklus van hidrouliese voorlaaiers in platinummyne. Navorsing toon dat slegs 53% van die RH340 voorlaaiers wat in die myn gebruik word ’n diensperiode van 3 500 uur in produksie haal alvorens meganiese herstelwerk genoodsaak word. ’n Alternatiewe voeringplaat met langer diensperiodes kan die produktiwiteit van die meganiese voorlaaierkomponente verhoog terwyl produksie-uitsette en hoë vlakke van doeltreffendheid gehandhaaf word. Die slytvastheid van saamgestelde CK- en standaard SV-plate is vergelyk deur twee RH340 voorlaaierbakke toe te rus met die onderskeie materiale, waarna die werkverrigting van die twee tipes plate onder normale produksietoestande gemonitor en gedokumenteer is tydens gereelde velddiensinspeksies. Die geldigheid van die navorsing is eerstens ondersteun deur ’n vergelykende literatuuroorsig van beide materiale. Tweedens is ’n reeks metallurgiese toetse uitgevoer op die twee materiale nà vergelykbare periodes in produksie, insluitend ’n vergelykende slytanalise. Die evaluering het aangedui dat saamgestelde CK-slytplate duurder is en dat die wagperiode van bestelling tot aflewering langer is, maar dat die CK-slytplaat minder weeg as die SV-slytplate. Die SV-slytplaat in hierdie studie het 3 283 ure in produksie voltooi, en die CK-slytplaat 4 803 ure. Die bevindinge van hierdie studie is van toepassing op komponente wat in platinummyne gebruik word, aangesien die slytasietempo van laaibakvoerings beïnvloed word deur die geologiese eienskappe van die las wat dit moet skuif. Die studieresultate ondersteun die aanbeveling van CK as ’n alternatief tot SV voerings. Verdere navorsing behoort gedoen te word om die plasing en oriëntasie van die CK-plate te optimaliseer.

Modernization of a Chemical Nickeling Unit for Metal Products

Metal protective coatings have a number of advantages, including high corrosion resistance, resistance to mechanical stress, and attractive appearance. The article analyzes the requirements for technological equipment for chemical nickel plating of items made of carbon steels, aluminum, titanium, copper and their alloys. The disadvantages of standard equipment (chemical nickel-plating units functioning as separate technological units) during its operation as a part of a plating line are formulated. The results of modernization and design development for an improved unit for chemical nickel plating of metal products with repeated use of the plating solution are presented. The calculation of the walls’ strength, thermal calculation of tubular electric heaters, the calculation of a single-side suction without blowing with a suction gap in the horizontal plane were performed. Pneumatic cylinders with the required working force and stroke were selected. The modernized unit is more compact, easier to maintain, and its design allows it to function as a part of a plating line. Testing of the unit in a plating section of a real manufacturing facility showed its high efficiency.

Structural analysis and design of irregular shaped reinforced concrete slabs using a simplified design method

This paper presents a simplified method to analyze and design the irregular reinforced concrete slabs based on structural safety and economy. The triangular, trapezoidal, and curved slab sections are selected in this study to be analyzed and designed using a simplified design method approach (SDM) as these sections are the most common type of irregular slab sections used in the construction industry. Flexural design formulas for triangular and curved slabs are derived based on the theoretical principles of plate and yield line theories and ACI building code of design constraints. Numerical examples are presented in this study to illustrate the method capability of designing the most commonly used irregular slabs sections. The complete design of four triangular slabs (TS-1 to TS-4) and four curved slabs (CS-1 to CS-4) is provided in this study. Besides, the required equivalent (triangular and rectangular) shaped sections are provided to deal with irregular trapezoidal slab section. The selected irregular slab sections (triangular and curved slab sections) are also analyzed and designed using the computer software (SAFE) and the results obtained are compared with the numerical solutions. The percentage difference of the simplified method with the finite element software (SAFE) ranges from 4% to 12%. The results obtained for all the selected irregular shaped slab sections indicates that the SDM is a good and quick approach to design irregular (triangular and curved) slab sections.

Root Cause Analysis of Cover Assembly Line of Clutch Plate

The cause and effect analysis mainly aims to reduce the consumer complaints with failure mode analysis and 8D principle. This work aims to reduce the run out defect percentage in clutch cover plate and most of the defects are produced due to run out. The overall defect observed from run out was usually 60-70%. The height difference between the fingers exceed the specified limit is named as run out defect for 18 finger diaphragm. The major parameters identified for measuring root-cause analysis of clutch plate are diaphragm finger uneven, diaphragm angle, diaphragm bi-cone height and diaphragm hardness. The root-cause defect was reduced by cause and effect method, 8 D analysis and 5W principle. The lean principle is employed in this work to utilize the men, material and resources with maximum efficiency. The lean principle reduces the waste and allows the company to supply the product in time with maximum accuracy.

Cyber-physical production system approach for energy and resource efficient planning and operation of plating process chains

Plating process chains are characterized by a high specific energy and resource demand as well as a high complexity due to dynamic interdependencies between and within processing steps. Planning and operating plating process chains should focus on aspects from cleaner production such as a high energy and resource efficiency, low impacts on the environment as well as on economic aspects. A high process transparency is required to meet these objectives and to evaluate the effects of improvement measures. An energy and resource flow simulation can support this by providing a fully parameterizable digital twin of the physical plating line. This simulation is integrated into a cyber-physical production system approach and connected to the IT environment of the plating company for the simulation of real scenarios. For the parameterization of the energy model, continuous and temporal measurements are combined systematically while the resource flow model is parameterized through information from the manufacturing IT systems. The successful implementation at a job plating company with an industrial acid zinc-nickel plating line indicated reachable electricity and resource savings of up to 10% in four scenarios. The electricity and plating metal demand was allocated to single carriers and products as basis for a product-based environmental and economic analysis. Especially in case of different carrier load levels, the energy and resource demand per product varies significant. The developed approach and its successful implementation emphasizes the need of a high process transparency for planning and operating plating process chains to accelerate the shift towards cleaner production.

Engineering diagnostics of shaft lining in Gubkin Mine

Shafts in Gubkin Mine, KMAruda have been in operation since the late 1940s. The shafts are sunk in difficult hydrogeological conditions. At the present time, due to transition to deeper levels, deeper mine dumps are required. It is necessary to reinforce shaft lining in watered rocks. During long-term service of shaft 1, due to corrosion, thickness of liner plates and horizontal ribs has decreased by 1.5–2 and 3–5 mm, respectively (two-side corrosion). As a result, the load-bearing capacity of the tubbing has lowered by 5–7%. At the same time, the actual stresses are not higher than 22 MPa, which is 10 times less than the design compression resistance of gray cast iron as per Construction Code SP 16.13330.2017. Field studies have been performed in Gubkin Mine toward improvement of operating safety of shafts during mineral mining at deeper levels. Stress state diagnostics of lining in shaft 1 shows that the lining preserves its load-bearing capacity in all types of rocks. Thus, safe operation can be continued without extra expenses connected with the lining reinforcement. The field studies in the cage shaft show that pressure on the lining in frozen rocks is 1.5–2 times higher than the design values. It is recommended to continue the studies to estimate effects of possible rock displacements on the lining during further mining.

The Influence of the Use of Polymer Lining within the Roller Press Gravity Feeder on Briquette Quality.

When considering the operation of roller presses for the consolidation of fine-grained materials, the main problems are disturbances in the proper flow of the material and its bridging in gravity feeders. This is especially true for small and medium capacity presses, where the hoppers for dosing the material are narrow. This article presents innovative laboratory tests of the impact of using a polymer plate lining in the gravity feeder of a roller press. Polymer materials Polyacetal C (POM C) and Ultra-High-Molecular-Weight Polyethylene (UHMW-PE) were used for the tests. The influence of the use of plates on the material flow and quality of briquettes was investigated in comparison with the case where such plates were not used. The research showed an improvement in the flow of fine-grained materials in the feeder and an increase of the briquette strength indexes, as compared to those cases when polymer linings were not used in the feeder.

Failure Analysis of Coke Dry Quenching Car Liners in Coke Plant

Coke dry quenching (CDQ) bucket is used to carry hot coke to CDQ chamber for cooling. The liners provided inside the bucket were getting buckled and cracked after 6–7 months of service. The thermography was carried out, and results showed that maximum temperature inside bucket is 600–650 °C. Chemical analysis revealed the failed liners were made of 600-QT spheroidized cast iron. Metallographic study showed decarburization, nodule decomposition, and thick scale in the hot(inner) side of liner plate. Pearlite graphite nodules decompose to cementite and ferrite, and hardness taken on the cementite globules (280 HV) confirms decomposition. Type IV and V graphites were observed in the heat affected zone, whereas in cold side of the liner plate VI graphite nodules were observed. Hardness variation was observed in the cracked sample along the thickness, and it showed lower hardness at hot surface due to ferritic structure, but at cold zone specified higher hardness was achieved. This nodules bursting, decarburization, and scale formation indicated microstructural degradation due to prolong use at high temperature (above 600 °C) in S.G iron. The microstructural deterioration resulted in lower hardness and decreased strength causing buckling and cracking. To enhance the service life of liner, austenitic heat-resistant casting steel with added Ni & Mo was recommended and it enhanced the service life by at least 150%.

A Plate Lines Up the Bone Better, But That Doesn't Seem to Matter Much: Commentary on an article by Andrew R. Stephens, BS, et al.: "Volar Locked Plating Versus Closed Reduction and Casting for Acute, Displaced Distal Radial Fractures in the Elderly. A Systematic Review and Meta-Analysis of Randomized Controlled Trials".

A Plate Lines Up the Bone Better, But That Doesn't Seem to Matter Much: Commentary on an article by Andrew R. Stephens, BS, et al.: "Volar Locked Plating Versus Closed Reduction and Casting for Acute, Displaced Distal Radial Fractures in the Elderly. A Systematic Review and Meta-Analysis of Randomized Controlled Trials".

High-Precision Noncontact Guided Wave Tomographic Imaging of Plate Structures Using a DHB Algorithm

The safety diagnostic inspection of large plate structures, such as nuclear power plant containment liner plates and aircraft wings, is an important issue directly related to the safety of life. This research intends to present a more quantitative defect imaging in the structural health monitoring (SHM) technique by using a wide range of diagnostic techniques using guided ultrasound. A noncontact detection system was applied to compensate for such difficulties because direct access inspection is not possible for high-temperature and massive areas such as nuclear power plants and aircraft. Noncontact systems use unstable pulse laser and air-coupled transducers. Automatic detection systems were built to increase inspection speed and precision and the signal was measured. In addition, a new Difference Hilbert Back Projection (DHB) algorithm that can replace the reconstruction algorithm for the probabilistic inspection of damage (RAPID) algorithm used for imaging defects has been successfully applied to quantitative imaging of plate structure defects. Using an automatic detection system, the precision and detection efficiency of data collection has been greatly improved, and the same results can be obtained by reducing errors in experimental conditions that can occur in repeated experiments. Defects were made in two specimens, and comparative analysis was performed to see if each algorithm can quantitatively represent defects in multiple defects. The new DHB algorithm presented the possibility of observing and predicting the growth direction of defects through the continuous monitoring system.