Automatic Measurement Device Research Articles

Automatic measurement device of laser-induced damage threshold and its experiment

Automatic measurement device of laser-induced damage threshold and its experiment

Device for automatic measurement of light pollution of the night sky

Research on light pollution of the night sky has been carried out in Toruń, Poland since 2017. Initially, the measurements were conducted within a network of 24 points using a handheld sky quality meter with lens (SQM-L) photometer (Unihedron, Canada). Based on these measurements, the first accurate maps of night sky pollution by artificial light in Toruń have been developed, both in seasonal and annual terms. Using the experience gained and elements of modern technology, a decision was made to construct an automatic network of mobile devices measuring light intensity at night, covering the entire city of Toruń. This paper presents the technical characteristics of the constructed automatic measurement devices that make up the distributed monitoring network and the process of testing and using the devices. The implementation of this project has started in 2020. To accommodate the evolving expectations of different user groups and the observed trends in the concept of Smart Cities, especially those related to the communication between devices of the Internet of Things, LoRaWAN was selected for data transmission. The first stage involved the construction of a prototype of an automatic, portable and cost-effective device, which was subjected to months of field testing under operational conditions. The device was built using off-the-shelf electronic components and a housing that met the requirements for outdoor use. The next stage was to calibrate the device by simultaneously comparing the obtained results with measurements taken using professional SQM devices. This was followed by the preparation of 35 identical devices, which are already operating in the measurement network in the city of Toruń. Elements of the network are prepared in a way that allows for further expansion and makes data available in the form of an application for many recipients.

Machine vision-based relative-angle measurement system between circular holes

In this study, the machine-vision technique is employed to measure the angle between two circular holes for the derailleur parts of a bicycle. A delta robot equipped with a motorized zoom lens is constructed as an automatic measurement device. In this way, we can detect the normal vectors of circular holes with different positions and sizes by using only one camera. By calculating the plane normal vectors of two circular holes within the camera coordinate system and performing the cross-product operation, the angle between the two circular holes is obtained. Simulation experiments reveal that the measurement method is influenced by the projection eccentricity error, and the error can be reduced by increasing the focal length and employing the virtual-center alignment method. The results show that the average error for measuring the derailleur parts is approximately 0.061°, and the standard deviation is 0.112°. Experimental analysis indicates that while the magnification of the image is larger, the average error of the measurement result is reduced, and the standard deviation is reduced as well. When the magnification is 0.4×, the measurement average error is 0.04°, and standard deviation is 0.101°. When the distance between the center of the circle and the center of the image is increased, the error in the angle calculation is also increased. A significant improvement is obtained by setting the fitting center position to the optical central position, which omits the influence of the error amplification caused by the distance of the circular hole from the optical axis.

Development of an automatic measurement device for double laser shield tail gap based on image recognition technology

Shield tail clearance is an important basis for the selection of segment assembly and shield attitude control. It is the most direct factor affecting shield tail brush wear. Poor shield tail clearance is prone to segment damage and shield tail seal failure. Using manual measurement of the shield tail gap, the measurement data has a certain hysteresis, and can not directly reflect the changing trend of the shield tail gap. Based on image recognition technology, a dual laser shield tail gap measurement device was developed to measure the changes in the shield tail gap during shield tunneling. The field test shows that: 1 The measurement device can monitor the shield tail gap in real time, and can simulate the ellipticity of the shield tail, monitor the deformation of the shield tail and the space state of the shield tail and the tube. 2 The acquisition device adopts a dual laser transmitter, meanwhile, the attitude of the shield machine cannot be controlled in real time, Can accurately establish the geometric relationship between the actual distance and the pixel distance, improve the test accuracy of the measuring device, and control the monitoring accuracy at 3.8 mm.

Пристрій для дослідження температурної сталості характеристик перетворювачів напруги в частоту

The article presents the research results on a device for automatic measurement of the temperature stability of the output characteristics of voltage-to-frequency converters. The device can be used to measure mechanical stresses in the ship's hull. The main source of information on the state of the mechanical stress on the hull of the ship is the integrated monitoring system. Monitoring methods are based on measuring the frequency of the output signals from the sensors based on strain gages, which have a wide scatter of values for parameters and characteristics and depend on external factors. A possible solution to this problem is to use a device that would convert the analog sensor signal into a more noise-immune signal of another type, for example, voltage-to-frequency converter. It is for such systems based on synchronous integrated converters that the authors have developed a device for automatic measurement of the temperature stability of the output characteristics of frequency converters. Such device can measure the thermal stability of the convertor automatically, which makes it possible to analyze the effect of temperature on the output characteristics of the converter and to experimentally study the sensors in a wide range of operating temperatures (from room temperature to 70℃). The study of the thermal stability of the characteristics of such sensors made it possible to confirm the quality of its electronic components and to determine which parameters need to be adjusted. The device is a set of units, one of them being a control circuit based on the ATmega-16 RISC microcontroller. This design and the developed algorithm for the device operation makes it possible to determine the output frequency with a high accuracy (with a measurement time of 1 sec, the accuracy reaches 0.05%). The developed device allows finding the ways to increase the thermal stability of mechanical stress sensors based on integral converters.

Development and Experiment of an Automatic Measurement Device for Water Coupling by Image Processing

This paper describes an automatic measurement device for water coupling, which can drive the water coupling doing automatic reciprocating motion and measuring the product indicator of air input by the result of image processing. The control software is developed by using STM32 processor, which deals with the reciprocating motion control and data acquisition. The correctness of working principle is verified through a series of experiments of automatic motion, and the product indicator is calculated based on image analysis theory. It can not only analyze and study the practical application for the products of water coupling, but also provide a new approach for automatic experiment and measurement in unmanned operation.

Endothelial Function Assessed by Automatic Measurement of Enclosed Zone Flow-Mediated Vasodilation Using an Oscillometric Method Is an Independent Predictor of Cardiovascular Events.

BackgroundA new device for automatic measurement of flow‐mediated vasodilation (FMD) using an oscillometric method has been developed to solve technical problems of conventional FMD measurement. This device measures enclosed zone FMD (ezFMD). The purpose of this study was to evaluate the prognostic value of endothelial function assessed by ezFMD for future cardiovascular events.Methods and ResultsWe measured ezFMD in 272 participants who underwent health‐screening examinations. First, we investigated cross‐sectional associations between ezFMD and cardiovascular risk factors, and then we assessed the associations between ezFMD and first major cardiovascular events (death from cardiovascular causes, stroke, and coronary revascularization). Univariate regression analysis revealed that ezFMD was significantly correlated with age, triglycerides, glucose, smoking pack‐years, estimated glomerular filtration rate, high‐sensitivity C‐reactive protein, and Framingham risk score. During a median follow‐up period of 36.1 months (interquartile range 18.8–40.1 months), 12 participants died (6 from cardiovascular causes), 3 had stroke, 8 had coronary revascularization, and 10 were hospitalized for heart failure. There was no episode of acute coronary syndrome during the study period. Participants were divided into tertiles (low, intermediate, and high) based on ezFMD. Kaplan–Meier curves for first major cardiovascular events among the 3 groups were significantly different (P=0.004). After adjustment for cardiovascular risk factors, the low group was significantly associated with an increased risk of first major cardiovascular events compared with the high group (hazard ratio 6.47; 95% CI 1.09–125.55; P=0.038).ConclusionsThese findings suggest that endothelial function assessed by ezFMD may be useful as a surrogate marker of future cardiovascular events.Clinical Trial Registration URL: https://upload.umin.ac.jp. Unique identifier: UMIN000004902.

Processing Data from Automatic Measurement Device

This article deals with the problem of automated data processing in automotive industry. Correct and productive control has an unprecedented importance and this area of Metrology is very intensively developed at the present. Researchers at University of West Bohemia in cooperation with company Astro-Kovo Plzeň developed progressive measuring device “Astro-box”, which allows highly progressive automatic control simple parts mass and mass production. The article contains a brief presentation of the CMM measuring unit along with reasons its use of this unit. The authors also present possibilities the location measuring device in real production conditions through environmental box. The main part of the paper, however, deals with the transfer of large amounts of data acquired in the automatic mode of the machine. This data may be used locally for basic binary analysis, or transmit through protocols in order complex statistical analysis required in the automotive industry.

Estimação da área foliar por método não destrutivo, utilizando medidas lineares das folhas de espécies de Passiflora

Objetivou-se, com este trabalho, desenvolver uma equação confiável, que possibilite calcular a área foliar de forma rápida e não destrutiva, utilizando medidas lineares da folha, para as diferentes espécies de Passiflora (P. alata, P. coccinea, P. gibertii, P. ligularis, P. misera, P. mucronata, P. nitida, P. setacea). Foram coletadas trezentas folhas, de diferentes tamanhos, de cada espécie. Realizaram-se análises de regressão da área foliar versus comprimento da nervura principal, maior largura da folha e o produto destas. A área foliar foi medida com um dispositivo de medição automática e as medidas lineares foram determinadas utilizando-se régua. O modelo linear escolhido, para todas as espécies, foi o que utiliza o produto das variáveis independentes, por apresentar maior coeficiente de determinação (R²) e maior significância do coeficiente de regressão. Os modelos apresentaram coeficiente de determinação ajustado superior a 0,927 e índice de desempenho ótimo, segundo a classificação de Camargo e Sentelhas. No processo de validação do modelo, mostrou-se que a correlação da área foliar medida com a área foliar observada foi muito alta. Os resultados obtidos neste estudo demonstram que a área foliar das espécies de Passifloras podem ser preditas, usando-se as determinações do comprimento e da largura das folhas.

Automatic Monitoring of the Amount of Deposited Precipitation

AbstractAn automatic device for measurement of the amount (weight) of deposited precipitation developed at the Institute of Atmospheric Physics, Academy of Sciences of the Czech Republic, is described. Examples of measurements of various types of deposited precipitation are presented. The paper also discusses the response of the measuring instrument to falling precipitation and the influence of wind on the measurements. The results of first measurements proved that the instrument is suitable for automatic and continuous monitoring of deposited precipitation.

Performance and Error Analysis for Automatic Measurement Device of Dissolved Oxygen

Dissolved oxygen (DO) is an important index of water environmental monitoring, to which accurate and rapid determination is of great significance. The automatic DO measurement device, which was launched by Core Company, is able to fast and batch determinate dissolved oxygen in water. Based on this advantage, this study further evaluated the performance of the dissolved oxygen meter as well as analyzed the precision and accuracy of dissolved oxygen determination in different water bodies using mathematical statistics method. The results show that the automatic DO measurement device completely meets the requirements of the national DO automatic analyzer. The instrumental measurement results show high precision and accuracy in different water bodies in addition to the industrial waste water and they keep in line with the traditional iodometry determination results. Experiments of parallel determination of pure water of saturation dissolved oxygen make clear that the determination values of the four electrodes of the apparatus have no significant difference.

Researches on Diameter Automatic Measurement Device of Artillery Gun Tube

The powder chamber of cannon gun tube was an important indicator which affected gun performance. The accuracy of fire, precision and the other technical indexes were inevitably affected by the chamber geometry parameters directly or indirectly. So the detection of cannon gun tube was an important part in the whole gun detection technology. This paper introduced the structure and the measuring principle about diameter automatic measurement device of cannon gun tube and made a prototype. Then the experimental verification was carried out. The experimental results showed that the automatic measuring device had the advantages of simple principle, convenient operation, high precision, and had a certain popularization value in use.

Development of the automatic device for measurement of superficial properties of substances

Development of the automatic device for measurement of superficial properties of substances

Gamma-Ray Attenuation for Characterization of Future Space Launcher Fuels

Gamma-ray attenuation is used to measure cryogenic mixture density. Parameters are optimized for specific space application. A simple error formula is established. The feasibility of the measurement is demonstrated. The effect of container's walls is measured. An automatic measurement device is built. A theoretical calculation is made for the geometry of Ariane V launcher

Gamma-ray attenuation for measuring cryogenic slush mixture density

Gamma-ray attenuation is used to measure cryogenic mixture density. Parameters are optimized for specific space application. A simple error formula is established. The feasibility of the measurement is demonstrated. An automatic measurement device is built.

The two-probe device for automatic measurement of the reflection coefficient

The two-probe device for automatic measurement of the reflection coefficient in the HF range is proposed and analyzed. The main parts in the instrument control system are the sum-and-difference bridge and the microprocessor.

A device for automatic measurement of writhing and its application to the assessment of analgesic agents

A device was developed for automatically measuring writhing in mice so as to be applied to the assessment of analgesic agents. The device was composed of a specially designed container equipped with a detector, namely, a mechanoelectro transducer for writhing. The detector was made up of units of a string, two plates, and two strain gauges. In the unit, each end of the string was connected to either of the plates to which either of the strain gauges was attached. The change in tension of the string due to writhing was converted into the mechanical strain of the plates and then the resistance change of the strain gauges. The resistance change was amplified by a Wheatstone bridge circuit that was connected to a differential amplifier, a high-pass filter, comparator(s), and a monostable multivibrator to obtain the electrical signal for writhing. Using this device, writhing was continuously measured, and evaluation of various types of analgesic agents was performed. The result suggests that this device has sufficient accuracy both for the detection of writhing and the evaluation of analgesics. It has the advantage of automatic measurement of writhing in contrast to the conventional visual observation method.

A Magneto-Optical Disk Testing System

A device for automatic measurement of bit error rates and identification of the position of errors in magneto-optical disks was constructed, and used in actual disk evaluations. The microcomputer-controlled device enables measurements on either individual tracks or on groups of tracks, and outputs bit error rates and error distributions. In actual tests, the bit error rate of grooved TbFeCo magneto-optical disks was found to be on the order of 10?4.

Device for automatic measurement of volume change. Technical note : Sharpe, P Geotechnique, V28, N3, 1978, P348–350

Device for automatic measurement of volume change. Technical note : Sharpe, P Geotechnique, V28, N3, 1978, P348–350

パルス法による温度伝導率の自動測定装置

パルス法による温度伝導率の自動測定装置