PHOTOCOLORIMETRIC GAS ANALYZER Russian patent published in 1995 - IPC

FIELD: analytical instrumentation. SUBSTANCE: photocolorimetric gas Analyzer is intended for measurement of concentrations of noxious substances in air. It includes indicating element, two light emitting diodes, main and supplementary photodetectors manufactured in the form of planar photodiodes, registering device, thin flat glass with light- reflecting coat and optical trap. Supplementary photodiode is connected to inputs of light emitting diodes through amplifier of negative feedback. Such connection enables control over radiation intensity to be realized which can change depending on change of different external factors. In this case signal from main photodiode will be determined only by change of parameters of indicating element which leads to increased precision of gas Analyzer. EFFECT: increased precision of gas Analyzer. 2 dwg