ACOUSTOELECTRONIC AND OPTOELECTRONIC GAS-SENSITIVITY DETECTORS

Abstract

The possibility of widening of range of gases, which are being analysed, the increasing of sensitivity and stability of gas detectors, which operate based on acoustoelectronic and optoelectronic effects, are being considered. The possibility of widening of range of gases, which are being analysed, the increasing of sensitivity and stability of gas detectors, which operate based on acoustoelectronic and optoelectronic effects, are being considered. Formation of clusters of various configurations on a surface of the semiconductor during its processing by various methods leads to essential modifications of electronic and adsorption properties of a semiconducting material is shown. We have obtained a modification of characteristics of the piezoelectric sensors, which are using volume and superficial ultrasonic waves in a piezocrystal (a resonance frequency of oscillations, a wave velocity) at a modification of a mass of adsorbed material on a surface. Investigated devices work in the nano-grammes range, and their sensitivity inversely proportional to area of section of electrodes. At making of the fiber-optical detectors of gas the key elements of device are an light guide, light emitter both light receiver and an optical sensing element. Additionally the special circuits are necessary for connection between these devices or for forming of the full measuring system.