Fourier analysis method for temperature compensation of a microcomputer-controlled piezoelectric crystal sulphur dioxide sensor

Abstract

A Fourier analysis method has been developed for correction of the temperature response of a microcomputer-controlled piezoelectric crystal sensor. The method can compensate for changes in frequency between 15 and 55 °C for a Quadrol [N,N,N′,N′-tetrakis(2-hydroxypropyl)ethylenediamine] coated crystal. When the crystal is used as a sensor for SO₂, however, the correction method fails to compensate for temperatures above 35 °C. It is thought that the failure is due to a change in absorption isotherms above this temperature. However, in the range 15–35 °C the compensation for temperature response works well.