Vi. Anisimkin et al., GAS THERMAL-CONDUCTIVITY SENSOR-BASED ON SAW, IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 42(6), 1995, pp. 978-980
An uncoated surface acoustic wave (SAW) delay line integrated with a s
uitable film heater is used as a gas sensitive element based on therma
l conductivity change, It detects concentrations from 0.1-100% of H-2,
O-2, He, and Ar in N-2 in the temperature range from 20-150 degrees C
. The value and sign of the SAW gas response are controlled by substra
te material and reference gas.