Measured Resonance Frequencies Research Articles

A compact square-shaped left-handed passive metamaterial with optimized quintuple resonance frequencies for satellite applications

The research aims to develop a more sophisticated novel left-handed and compact square-shaped metamaterial (SM) inspired multi-frequency bands like C-, X- and Ku-band applications. Even though the performance of existing satellite application devices are adequate, significant changes in technology over the past decades require advanced and more accurate techniques or devices. Hence, we approach the problem with a broader perspective by integrating a metamaterial structure in satellite application devices. As a general rule, the unconventional material known as metamaterial has extraordinary electromagnetic properties which are impracticable in commercially available materials. It represents an important study topic because this type of peculiar material is generally used in many field applications which encouraged us to experiment with the stated frequency bands by introducing a novel SM design. The novel SM design structure involved a 1.6 mm Epoxy Resin Fibre (FR-4) substrate material. This compact metamaterial design contains nine square rings with an altered small square ring joined in it. The numerical simulation of the SM design for satellite frequencies was performed using the Computer Simulation Technology (CST) Microwave Studio. The scattering parameters of the suggested SM design were determined by utilising Finite Integration Technique (FIT) in CST software. Several parametric studies that were analysed in this study include various design structure, types of substrate materials and SM array arrangement. Based on the adapted simulated frequency range (4 to 18 GHz), the unit cell SM exhibited five resonance frequencies at 5.49 and 7.33 GHz (in C-Band), 9.05 and 11.38 GHz (in X-Band) and 13.48 GHz (in Ku-Band). The measured resonance frequencies of the unit cell were 5.62 and 7.39 GHz (in C-Band), 9.15 and 11.32 GHz (in X-Band) and 13.51 GHz (in Ku-Band). The resonance frequencies obtained from both methods were similar. According to all three resonance frequencies, the SM design manifested a left-handed characteristic. Hence, on this basis, the proposed SM design with unique characteristics is deemed suitable for C-, X- and Ku-bands applications.

Speed of sound in the gaseous phase for HFO1234yf from 308 K to 370 K at pressures up to 1 MPa

2,3,3,3-tetrafluoropropene (HFO1234yf) has been regarded as a promising alternative refrigerant and gained increasing interesting due to its environmental friendly properties. The introduction of HFO1234yf requires knowledge of the accurate thermophysical properties. The accurate speed of sound data is important for the improvement of the dedicated equations of state and the application in energy-conversion system. The speed of sound in gaseous phase for HFO1234yf was measured by means of the acoustic resonance method using a fixed-path cylindrical resonator. Measurements were conducted in the temperature range from 308 K to 370 K with pressures up to 1 MPa. The speed of sound was obtained from the accurate measurements of acoustic resonant frequencies after being corrected for the perturbations from the viscous and thermal boundary layers, the gas filling duct, acoustic transducers and the shell motions. A total of 116 speed of sound data points were obtained with an expanded uncertainty less than 1.4 × 10−4 at the confident level of 0.95. The measured speed of sound shows good consistent with the literature data and the calculation of equation of state. The ideal gas heat capacities at constant pressure for HFO1234yf were deduced by fitting the measured speed of sound data along 13 isotherms. The determined ideal gas heat capacities at constant pressure are mainly consistent with the calculations of equation of state and the predictions of quantum mechanical calculations. A temperature dependent polynomial approximation of the ideal gas heat capacity at constant pressure for HFO1234yf was developed.

Identification of anisotropic viscoelastic moduli of CFRP by measurement of resonant frequencies

Measurement of the elastic moduli of carbon fiber-reinforced plastics (CFRP) can be difficult owing to the anisotropic and viscoelastic characteristics of CFRP. In this study, a technique based on resonant ultrasound spectroscopy is proposed that can identify the viscoelastic moduli of CFRP by measuring the resonant frequencies. The resonant frequencies of a CFRP specimen were measured by employing an experimental device comprising a pair of piezoelectric transducers and the spectrum analyzer software. The viscoelastic moduli were thereby identified by applying genetic algorithms. Considering the viscoelastic properties, it is possible to conduct highly accurate analysis as compared to the case in which the viscoelastic properties are not considered. Furthermore, by measuring the resonance modes that are significantly affected by the three independent viscoelastic moduli (, , ), each modulus can be identified with constant precision.

A Combination of Transmission Line Models as Design Instruments for Electromagnetically Coupled Microstrip Patch Antennas in the 2.45 GHz ISM Band

This communication presents an analytical framework that combines transmission line models for the design of electromagnetically coupled microstrip patch antennas for the 2.45 GHz industrial, scientific, and medical band. It provides initial values for all dimensions of the antenna, with measured resonance frequency errors below 6%. The initial design is optimized in two subsequent phases to center the resonance frequency and to increase the impedance bandwidth (BW), obtaining measured resonance frequency errors below 0.6% and BW enhancements of more than 1.2 times the original ones, respectively. The model has been validated with antenna prototypes based on rigid and textile materials, exhibiting excellent free-space measured BW of 4% and 5.12%, maximal measured gains of 4.28 and 7.33 dBi, and radiation efficiencies of 63.4% and 71.8%, respectively. Moreover, very stable on-body performance is obtained, with minimal frequency detuning when deploying the textile antenna on the human body. The measured maximum on-body gain for the textile antenna equals 5.5 dBi, with a simulated specific absorption rate of 0.323 W/kg at 2.45 GHz.

A novel resonance method for determining the complex permittivity of local inclusions in a rectangular waveguide

A novel resonance method for determining the complex permittivity of materials in the X-band is proposed. A distinctive feature of this method is that the sample under test, located in a radio-transparent isotropic and homogeneous dielectric matrix, is both a local inclusion and the excitation element of the resonance in the microwave module ‘waveguide–dielectric matrix–inclusion’. The complex permittivity of an inclusion is determined by comparing the measured resonance frequency and quality factor with the computed database value. The permittivity and loss factor of microwave ceramics, natural granite and ferrite are investigated, as well as crystals of lead fluoride PbF2 doped with holmium trifluoride HoF3 and erbium fluoride ErF3 of different concentrations. The method allows the permittivity and loss tangent to be determined with uncertainties of 0.1% and 5%, respectively.

Characterization of Fluid-Phase Behavior Using an Advanced Microwave Re-Entrant Cavity

To advance the thermodynamic models needed for many industrial processes, accurate measurements of fluid-phase behavior are essential. Therefore, we present a newly designed microwave re-entrant cavity apparatus to deliver improved phase-behavior measurements of pure and multicomponent fluids. The re-entrant geometry has spatially distinct resonant modes, which are used to determine the dielectric permittivity of the liquid and vapor phase and the liquid volume fraction (Λ). The first mode (fvac ≈ 320 MHz) is sensitive to small liquid volumes, the second (1.86 GHz) is sensitive to small vapor volumes, and the third (6.57 GHz) is sensitive to the interface location. At equilibrium, a system of three equations, one for each mode, allows for the dielectric permittivity of each phase and Λ to be determined from the measured resonant frequencies. The cavity’s suitability for solving this inverse problem was explored using finite element analysis and experiments with pure propane and pentane. A primary limitation of the method was the dependence of the mode-shape functions (Gn) on phase permittivities, which become measurable for high-frequency modes. We propose a solution to account for this dependence using finite element simulations that map the Gn surface as a function of Λ and the ratio of phase dielectric permittivities.

Is It Possible to Monitor Implant Stability on a Prosthetic Abutment? An In Vitro Resonance Frequency Analysis.

In order to apply the “one-abutment–one-time” concept, we evaluated the possibility of measuring resonance frequency analysis (RFA) on the abutment. This trial aimed to compare the Implant Stability Quotient (ISQ) values obtained by the PenguinRFA when screwing the transducer onto the implant or onto abutments with different heights and angulations. Eighty implants (VEGA®, Klockner Implant System, SOADCO, Les Escaldes, Andorra) were inserted into fresh bovine ribs. The groups were composed of 20 implants, 12 mm in length, with two diameters (3.5 and 4 mm). Five different abutments for screwed retained restorations (Permanent®) were placed as follows: straight with 1, 2, and 3 mm heights, and angulated at 18° with 2 and 3 mm heights. The mean value of the ISQ measured directly on the implant was 75.72 ± 4.37. The mean value of the ISQ registered over straight abutments was 79.5 ± 8.50, 76.12 ± 6.63, and 71.42 ± 6.86 for 1, 2, and 3 mm height abutments. The mean ISQ over angled abutments of 2 and 3 mm heights were 68.74 ± 4.68 and 64.51 ± 4.53 respectively. The present study demonstrates that, when the ISQ is registered over the straight abutments of 2 and 3 mm heights, the values decrease, and values are lower for angled, 3 mm height abutments.

A Method for Measuring LC Resonance Frequency by Impulse Response

LC circuit resonance frequency measurement often requires the use of professional analysis instruments such as LCR meters, vector network analyzers, but currently such instruments on the market are expensive, and it is difficult for non-professional institute personnel to access. Here comes unnecessary trouble. In view of this situation, a test method for measuring the resonance frequency using only a digital storage oscilloscope is proposed. Using the impulse signal to obtain the system response, the response waveform period can be observed through the oscilloscope.

A Helmholtz Resonator with Spiral Neck for Analyte Concentration Measurement in Low Frequency Range

Helmholtz resonators (HR) have been proven to have feasibility for sensor applications with good performance. However, for biosensor application, when the amount of test sample is limited, the operating frequency tends to be very high, which may bring challenges of resonance excitation and frequency measurement. In this paper, a modified HR was proposed for biosensor application at a lower frequency, by designing the neck of the HR as a type of an Archimedes spiral, which can increase the neck length as much as possible without occupying much space. The resonant frequency of the proposed HR was derived by treating it as an HR with a straight neck with the equivalent length. An analytical example was calculated and verified by acoustic finite element analysis, and the results clearly showed that the frequency decreases in comparison to that of the conventional HR. Based on the underlying theory, the measurement principle was proposed and the experiment setup was established using a 3D-printed structure. The experiment was done using test solutions with different glucose concentrations, whose results showed consistency with the analytical results and noticeable frequency increases with the glucose concentration. Prospective results of the proposed HR after miniaturization show an operating frequency around 3 kHz when the amount of test sample is 0.1 mL, which will facilitate use of the common acoustic power source and acoustic pressure sensors in the sensing system.

Flexible Wearable Pre-fractal Antennas for Personal High-Temperature Monitoring

This paper proposed a new flexible and wearable antennas design based on teragon pre-fractal geometry until the third level, for monitoring high-temperature in humans for wireless body area network operating band. The antennas were built in polyamide laminate dielectric material, which has suitable thermal and mechanical resistance characteristics for application in wearable antennas. The antenna’s structure was generated by teragon pre-fractal geometry using a MATLAB code and simulated with commercial software ANSYS. The application of teragon geometry allows controlling the resonance frequencies and radiation characteristics in comparison to simple square geometry. Teragon level 3 has provided maximum resonance frequency reduction, about 142.4%. In comparison of simulated and measured results on-body we noted that variation of resonance frequency is directly proportional to the fractal level, with the increase of fractal level there is greater variation in the difference between the simulated and measured resonance frequency, close results of gain, and higher simulated SAR value of 0.0653 mW/kg (K = 2), being within standard indicated by international institutions such as FCC and IEEE.

Resonance frequency measurement with accuracy and stability at the 10−12 level in a copper microwave cavity below 26 K by experimental optimization

Single-pressure refractive index gas thermometry (SPRIGT) is a novel primary thermometry technique, developed jointly by the Technical Institute of Physics and Chemistry (TIPC) of the Chinese Academy of Sciences (CAS) in China and LNE-Cnam in France. To help obtain a competitive uncertainty of 0.25 mK in thermodynamic temperature measurements, high-stability and low-uncertainty of microwave resonance frequency measurements better than 2 ppb have been demonstrated. This article describes how high-stability and low-uncertainty resonance frequency measurements were achieved using a copper microwave cavity. Microwave measurements were carried out under vacuum and isobarically at helium-4 pressures of 30, 60, 90, and 120 kPa over the temperature range of 5–26 K, with good consistency among microwave modes for the thermodynamic temperatures determined. Performance was optimized using an Allan variance analysis. In this way, with an integration time of 3 h, a stability and accuracy at the 10–12 level were obtained, an almost 20-fold improvement upon our previous result (Zhang et al 2019 Sci. Bull. 64 286–8).

THE EFFECT OF OSSEODENSIFICATION TECHNIQUE ON IMPLANT STABILITY (CLINICAL TRIAL)

Introduction: Dental implants primary or initial stability originates from the engagement with the cortical bone mechanically, whereas the secondary stability signifies the stability biologically by means of osseointegration through the bone formation and remodeling from the cancellous bone. Osseodensification is an innovative biomechanical technique to prepare the site. It uses Densifying Burs to produce low plastic deformation owing to its non-removal densifying method of site preparation, which preserves the bone enhancing the host site. Objectives: To evaluate the osseodensification (OD) technique used in implant site preparation by using the newly designed burs (Densah burs), and its effect on enhancing implant primary and secondary stability. Material and Methods: Twenty dental implants were placed in ten patients; each patient received one implant using the new Osseodensification drilling technique and one implant using the conventional drilling technique in the posterior maxillary ridge. Osstell was used in measuring resonance frequency (ISQ-scale) which is used to determine the amount of implant stability. Results: The results showed a significant improvement in both primary and secondary stability using densah burs. Conclusions: Densah burs produce better bone quality around the implant than conventional drills, and therefore, there is an improvement in the primary and secondary stability.

Radio Frequency Studies of Soot Loading and Ammonia Storage on a Diesel Particulate Filter with a SCR Catalyst Coating

In the exhaust system of some diesel vehicles, the diesel particulate filter (DPF) is loaded with a selective catalyst reduction (SCR) wash coat. This combined catalyst, referred to as a SDPF, serves two functions by trapping soot and by reducing NOx emissions. The latter is accomplished via reactions of NOx with NH3 stored on the SCR wash coat. The NH3 is dosed, as urea, upstream of the SDPF.

Electrodeposition of Au-Cu Alloys and the Micro-Mechanical Properties

Electrodeposited gold is used in movable micro-components of micro-electro-mechanical systems (MEMS) devices to allow further enhancement in the sensitivity and miniaturization of the device [1]. Mechanical strengths of gold are low among materials commonly used as structure materials in electronic devices. Electrodeposition method is advantageous in strengthening metallic materials because of the ability to refine the average grain size to nano-scale, which the mechanical strength increases along with a reduction in the grain size based on the grain boundary strengthening mechanism or the Hall-Petch relationship. Alloying of metallic materials is also an effective strategy to achieve the strengthening according to the solid solution strengthening mechanism.On the other hand, mechanical properties of metallic materials exhibit the sample size effect when dimensions of the specimen are reduced to micro or sub-micro scale. Therefore, mechanical property characterization of materials for MEMS applications should be conducted using specimens having dimensions in micro-scale. Various micro-mechanical testing methods have been developed in our group to characterize micro-specimens, such as micro-compression test [2,3], micro-tensile test [4], and micro-bending test [5]. Among them, micro-bending test is suggested to be the most suitable method to evaluate materials for applications in MEMS when compared with micro-compression and micro-tensile tests since cantilever-like structures are often applied in MEMS components, such as the micro-spring in a MEMS accelerometer.In this study, Au-Cu alloys are prepared by electrodeposition, and micro-mechanical properties of the electrodeposited Au-Cu alloys are characterized by a micro-bending test. Young’s modulus is an important information in design of movable micro-components. A non-destructive Young’s modulus evaluation method, resonance frequency measurement, is conducted using the Au-Cu alloy micro-cantilevers. Also, long-term vibration tests are conducted to reveal structure stability of the Au-Cu alloy micro-cantilevers.The Au-Cu electrolyte used in this work was a commercially available electrolyte provided by MATEX Co. Japan, which contained 17.3 g/L of X3Au(SO3)2 (X = Na, K), 1.26 g/L of CuSO4, and ethylenediaminetetraacetic acid as the additive with pH at 7.5. The electrodeposition was carried out at 50 °C, and the current density was varied from 0.1 to 8 mA/cm2. Specimens used in the micro-bending test were micro-cantilevers fabricated from the Au-Cu alloy films by focused ion beam. Dimensions of the micro-cantilevers fabricated were 10 µm × 10 µm × 50 µm. The micro-bending tests were conducted using a test machine equipped with a spherical diamond indenter at a constant displacement rate of 0.05 µm/s.For the Young’s modulus and long-term structure stability evaluations, the micro-cantilevers were prepared by electrodeposition combined with lithography process. The long-term vibration test was carried out under conditions of the cycle number in a range from 103 to 106, the frequency of 10.0 Hz, and the acceleration of 1.0 G (1 G = 9.8 m/s2). The structure stability was determined by evaluating height profiles of top surface of the micro-cantilevers before and after the vibration test by a 3D optical microscope.The Au-Cu alloy film electrodeposited at 5 mA/cm2 had the finest average grain size among films prepared in this work, which the grain size was 4.76 nm. Bending test of a micro-cantilever prepared from this film shows a high yield stress at 1826 MPa. Gold, copper, and Au-Cu alloys are known to be ductile materials, but brittle fracture was observed during the bending test when the current density used in prepared the film was higher than 5 mA/cm2.From the resonance frequency method, Young’s moduli of the Au-Cu alloy micro-cantilevers were ranged from 68.0 to 79.5 GPa, which were similar to the value of bulk-size specimens and indicated no sample size effect on the Young’s modulus. Regarding the long-term structure stability, after 106 cycles of the vibration test, all the micro-cantilever were still intact, and the height profiles did not change much after the vibration. Results obtained in this study confirmed high mechanical strength and structure stability in the electroplated Au-Cu alloys and demonstrated the advantage in applications as movable components in MEMS devices.[1] D. Yamane et. al. Appl. Phys. Lett. 104 (2014) 074102.[2] C.Y. Chen et. al. Electrochem. Commun. 51 (2016) 51-54.[3] H. Tang et. al. J. Electrochem. Soc. 164 (2017) 244-247[4] Y. Kihara et. al. Mater. Lett. 153 (2015) 36-39[5] K. Asano et. al. ECS J. Solid State Sci. Technol. 8 (2019) P412-P415.

Site response assessment and ground conditions at King Saud University Campus, Riyadh City, Saudi Arabia

Site response characteristics have a significant influence on ground motion vibrations. To evaluate the site response effects at King Saud University campus, the horizontal-to-vertical spectral ratio (HVSR) technique has been applied at 45 sites with about 400-m spacing. The recording time was more than 1 h at each site with a sampling rate of 100 Hz. The data were processed and analyzed using Geopsy software to produce measurements of fundamental frequency and minimum site amplification factor. Moreover, shear-wave velocity down to 30-m depth has been acquired at 10 measuring sites in the campus. In addition, geotechnical borehole data were collected from four boreholes within the campus. Generally, in majority of sites the H/V curve for amplitude spectra displayed a clear peak, signifying the presence of a sharp soil–bedrock impedance contrast between alluvial deposits and underlying bedrock. It is indicated that the fundamental frequency ranges between 0.64 and 1.94 Hz. Given the measured resonance frequency of around 1 Hz, buildings located on the alluvium that have 5 stories in height could experience soil-structure resonance, while the amplification factor varies from 1.19 to 11.22 indicating localized zones having high vulnerability index due to the considerable thickness of alluvial deposits. Moreover, shear-wave velocity ranges between 320 m/s and 684 m/s revealing zones of stiff soil to very dense soil/or soft rock which is correlated well with the geotechnical parameters of borehole data. Based on these results, the ground conditions of near-surface sediments in the King Saud University campus indicate weak zones that led to ground subsidence resulting in differential settlements of foundations.

Quantifying moisture damage in asphalt concrete using axisymmetric flexural vibration technique

ABSTRACT The Tensile Strength Ratio (TSR) test is commonly used to quantify the moisture susceptibility of asphalt mixtures. This test method is based on the indirect tensile strength, which is not a fundamental property and hence cannot be used in the asphalt mixture design process. Therefore, alternative test methods that use a fundamental property to quantify moisture sensitivity of asphalt mixtures are needed. This study investigates if the linear impact resonance shift and frequency spectrum bandwidth changes measured using Axisymmetric Flexural Vibration (AFV) technique can be used to quantify moisture damage. This test enables calculation of the dynamic elastic modulus of the disk, based on measured resonance frequency as well as quantification of vibration energy dissipation in the specimens based on the change in bandwidth of frequency spectrum. AFV test is used to quantify moisture damage susceptibility of asphalt mixture specimens with different moisture conditioning levels and different mixture designs. The results of the AFV test are compared with the TSR test. Also, the sensitivity of the AFV test to quantify the effect of thixotropic aging due to storage and temperature are discussed. The results show that the AFV technique can successfully quantify moisture damage and the effect of aging and temperature change.

Manufacture and characterization of graphene membranes with suspended silicon proof masses for MEMS and NEMS applications

Graphene’s unparalleled strength, chemical stability, ultimate surface-to-volume ratio and excellent electronic properties make it an ideal candidate as a material for membranes in micro- and nanoelectromechanical systems (MEMS and NEMS). However, the integration of graphene into MEMS or NEMS devices and suspended structures such as proof masses on graphene membranes raises several technological challenges, including collapse and rupture of the graphene. We have developed a robust route for realizing membranes made of double-layer CVD graphene and suspending large silicon proof masses on membranes with high yields. We have demonstrated the manufacture of square graphene membranes with side lengths from 7 µm to 110 µm, and suspended proof masses consisting of solid silicon cubes that are from 5 µm × 5 µm × 16.4 µm to 100 µm × 100 µm × 16.4 µm in size. Our approach is compatible with wafer-scale MEMS and semiconductor manufacturing technologies, and the manufacturing yields of the graphene membranes with suspended proof masses were >90%, with >70% of the graphene membranes having >90% graphene area without visible defects. The measured resonance frequencies of the realized structures ranged from tens to hundreds of kHz, with quality factors ranging from 63 to 148. The graphene membranes with suspended proof masses were extremely robust, and were able to withstand indentation forces from an atomic force microscope (AFM) tip of up to ~7000 nN. The proposed approach for the reliable and large-scale manufacture of graphene membranes with suspended proof masses will enable the development and study of innovative NEMS devices with new functionalities and improved performances.

High-Quality Nickel Ferrite Synthesized by a Modified Sol–Gel Technique Applied as Microstrip Patch Antenna Substrate

This paper presents the production of nickel ferrite powder synthesized by a sol–gel technique modified by ionic coordination reaction. Morphological powder characterization is presented via X-ray diffraction, scanning electron microscopy and energy-dispersive spectrometry. Bulk manufacturing by uniaxial press is developed, and its electrical characterization is shown. Three ferrite bulks were manufactured and characterized to evaluate the quality of the compression procedure. Permittivity and conductivity parameters were obtained and discussed according to reference papers. Characterized bulks were applied as a microstrip patch antenna with rectangular and circular geometries, designed by transmission line and cavity methods, respectively, to evaluate bulk features as substrate. Reflection coefficient and radiation patterns were simulated by a high-frequency structure simulator, and measurements of reflection coefficient were performed. The obtained radiation patterns presented good agreement between them and were consistent with the performed design. A maximum gain of 1.55 dB in the E plane could also be achieved despite the relatively high $$ tg\left( \delta \right) $$ for radiating devices. Simulated cross-polarization results are also displayed, where the maximum value obtained was −29.35 dB, highlighting the device's directivity. Good agreement between simulated and measured reflection coefficient was achieved in both geometries, reinforcing the high-quality ferrite powder production process. It was possible to reach 0.00% relative error between simulated and measured resonance frequency in one of the three circular patch devices, at 6.05 GHz. Maximum resonance frequency error presented in all performed measurements is 6.51%, associated with manufacturing and measurement issues. Despite that, the quality of the synthesized material could be observed in each discussed result.

Influence of the liquid injection hole to ripple frequency of the QCM sensor

The liquid injection is one of the crucial roles in the used of QCM sensors in a liquid application. Liquid sample injection should be controlled. As the liquid injected onto the QCM sensor surface using peristaltic pump, a short pressure pulse exists. The short pulse affect the stability of the resonance frequency of the QCM sensor. The pulsation flow of the peristaltic pump leads to a ripple resonance frequency of the QCM sensor. Resonance frequency measurement of the QCM sensor in the reaction cell injected using the peristaltic pump has been measured. Different injection holes size was made to observe the effect to the sensor stability. The result showed that frequency of the QCM sensor has a ripple frequency as the liquid injected using the peristaltic pump. It was observed that bigger injection hole at the exit flow resulted in a smaller ripple frequency. Further investigation is required to get the smallest ripple p frequency during the liquid injection using the peristaltic pump.

Piezoelectric Actuated Glass Plate for Liquid Density and Viscosity Measurement.

This paper reports on a new system for liquid density and viscosity measurement based on a freely suspended rectangular vibrating plate actuated by piezoelectric ceramic (PZT) actuators. The Lamb mode used for these measurements allows us to infer both the density and viscosity in a larger range as compared to the existing gold-standard techniques of MEMS resonators. The combination of the measured resonance frequency and quality factor enables extraction of density and viscosity of the surrounding liquid. The system is calibrated while performing measurements in water glycerol solutions with a density range from 997 to 1264 kg/m3 and viscosity from 1.22 to 985 mPa·s, which is a larger dynamic range compared to existing mechanical resonators showing an upper limit of 700 mPa·s. The out-of-plane vibrating mode exhibits quality factor of 169, obtained in deionized water (1.22 mPa·s viscosity), and 93 for pure glycerol with a viscosity of 985 mPa·s. This Lamb wave resonating sensor can achieve measurement in fairly large viscosity media while keeping a quality factor superior to 90. Measurements performed on oil validate the use of the Lamb system. Oil density is evaluated at 939 kg/m3 and dynamic viscosity at 43 mPa·s which corresponds to our expected values. This shows the possibility of using the sensor outside of the calibration range.