A New System for Acoustoelectronic Gas Sensors Analysis

Pasternak

2013

Acta Phys. Pol. A

Self Cite

In the surface acoustic wave sensors response analysis the inuence of dierent factors on acoustic wave propagation velocity and resonant frequency of the surface acoustic wave device plays an important role. Because the resonant frequency is commonly assumed to be a sensor response, knowing the magnitude of this inuence and its mechanisms is very important. The factors which interfere the most with the surface acoustic wave sensor response include: temperature, pressure, and humidity. The inuence of humidity is almost impossible to eliminate because of phenomena connected with water adsorption at the surface of the substrate as well as the electrodes of the device.

Section: Resultsmentioning

confidence: 99%

Influence of Humidity on SAW Sensor Response

Pasternak

2013

Acta Phys. Pol. A

Self Cite

“…Beside frequency changes the second setup enable to measure SAW amplitude attenuation. This setup has been described in detail in [11]. It consists of external ultrastable SAW excitation unit and digital output signal analyser.…”

Section: Measurement Resultsmentioning

confidence: 99%

The Influence of External Pressure on Resonant Frequency of SAW Resonator

Pasternak

2015

Acta Phys. Pol. A

Self Cite

The results of numerical simulations and experimental measurements of surface acoustic wave resonator centre frequency and amplitude dependence on external pressure changes in the range 01 atm are presented in the paper. According to the analytical model as well as numerical calculations the pressure inuence on the resonator centre frequency is linear. Unfortunately, in the real measurements the linearity is dicult to observe. Additional eects that modify the linear dependence of the centre frequency on pressure are caused by water particles. It is well visible especially in the low pressure range. The phenomenon can be applied for research of water contents in dry gases as well as construction of acoustoelectronic vacuometers.

“…To carry out the measurements described herein, two-port 196 MHz Rayleigh wave resonators [13] and measurement station of authors design were used [14,15]. It is indeed a precise, computerized system for measuring transmission parameters, dedicated to testing two-port SAW resonators and sensors based on them.…”

Section: Measuring Setmentioning

confidence: 99%

Surface acoustic waves application for gas leakage detection

Pasternak¹,

Grabka

2020

Diagnostyka

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.