Applicability of Different SAW Oscillators' Topologies for High Frequency Gas Sensors Construction

Pasternak, M.

doi:10.12693/aphyspola.118.1232

Cited by 8 publications

(4 citation statements)

References 7 publications

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“…The tests of the theory outlined here can be carried out using almost any system with a Rayleigh's wave device that allows easy measurement of its parameters. In general, self-excited generation systems are used for this purpose, using SAW delay lines or resonators [11,12]. However, these systems have the disadvantage of being only suitable for the measurement of frequency changes.…”

Section: Measuring Setmentioning

confidence: 99%

Surface acoustic waves application for gas leakage detection

Pasternak¹,

Jasek

Grabka

2020

Diagnostyka

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Surface Acoustic Waves (SAW) are by their nature very sensitive to changes in physical propagation conditions. This statement relates primarily to the properties of the substrate, i.e. the surface on which these waves propagate, but under certain conditions it also refers to the parameters of the gaseous environment directly in contact with the substrate. The influence of this environment on SAW parameters can be used to detect specific gases that are present in this environment and change its density. The basic research problem was to determine the dependence of the resonant frequency and attenuation of waves in a resonator with SAW on the parameters and concentrations of specific gases in the gaseous environment in which the resonator works. The secondary objective was to determine whether this dependence is strong enough to be used for the construction of sensors and whether it is possible to identify gases present in the environment based on such measurements. Two-port resonators from SAW and measuring stand of our own design were used for the research. The analyses conducted and laboratory measurements confirmed the existence of the abovedescribed dependence. It was found that it increases with the increase of the difference between the molar mass of the gas being tested and the average molecular mass of the gaseous environment. This fact makes the proposed method suitable for detection of gases of relatively low or high molar masses. In air it is possible to detect hydrogen, helium, krypton, xenon and vapour of volatile compounds with sufficiently high molar masses.

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Section: Measuring Setmentioning

confidence: 99%

Surface acoustic waves application for gas leakage detection

Pasternak¹,

Jasek

Grabka

2020

Diagnostyka

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“…A typical SAW device is essentially an oscillator where the wave energy is concentrated on the surface of the piezoelectric material. , LiNbO 3 is a good material for fabricating the SAW device, owing to its high electromechanical coupling and piezoelectric coefficients and smooth surface . Therefore, any disturbance on the surface of the SAW device (e.g., mass loading, electrical loading, elastic loading, etc.)…”

Section: Introductionmentioning

confidence: 99%

Surface Acoustic Wave Devices Based on Graphene Oxide/Au Nanorod Composites for Gas-Phase Detection of 2,4,6-Trinitrotoluene

Yang

Wang

Gao

et al. 2022

ACS Appl. Nano Mater.

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Surface acoustic wave (SAW) devices are extensively used to detect various gaseous chemicals, owing to their wireless passive potential and single-signal display. However, the sensitivity, selectivity, and long response time of the sensitive layers limit their use in detecting explosive gases. In this study, we developed a 2,4,6-trinitrotoluene (TNT) gas sensor based on the SAW device with GO/PDEA/AuNR/PATP nanocomposites. The GO/PDEA/AuNR/PATP-SAW sensor recorded a considerable negative frequency shift (−70.67 kHz) in detecting 80 ppm TNT at 25 °C/20 RH %, thus enabling the detection of 40 ppb to 80 ppm TNT with the limit of detection as low as 40 ppb (−3.02 kHz). Short response/recovery time (40 ppb: 6.2/11.8 s) with good cycling stability and selectivity were achieved. The high performance of the GO/PDEA/AuNR/PATP-SAW sensor is attributed to its large specific surface area, roughness, and porosity. The oxygen-containing and electron-rich amino groups of the GO/PDEA/AuNR/ PATP provide many active sites for adsorbing TNT gas. The primary sensing mechanism is the mass and electrical load of the nanocomposite in TNT gas. It has an optimum thickness of 380 nm and room temperature as the optimum operating temperature. Therefore, this study would serve as a good basis for the research and development of next-generation acoustic gas-phase explosive sensors.

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“…The resonant frequency of SAW devices used on sensing applications usually lies within 30-300 MHz [3]. Our choice of two-port resonators is based on the lower insertion loss and high Q factor of these devices, which make the circuit oscillation frequency more stable, lower phase noise and higher phase slope than delay lines and one-port resonators [5].…”

Section: Introductionmentioning

confidence: 99%