OPTICAL GAS ANALYZER Russian patent published in 1994 - IPC

FIELD: measuring equipment. SUBSTANCE: gas analyzer is provided with shaper 2 of parallel light flux, interference filter 3 provided with rocking drive 4, radiation detector 7, and electronic unit for processing a signal, which switches DC amplifier 8, low-frequency filter 9, band filter 10, which is adjusted on frequency multiple to frequency of rocking of interference filter 3, two amplitude detectors 11,12, and circuit 13 of a divider provided with indicator 14. The electronic unit for processing the signal extracts harmonics multiple to frequency of rocking of interference filter 3 and zero harmonic and divides amplitude of the harmonic, which is multiple to rocking frequency of the filter, by the amplitude of the zero harmonic. EFFECT: enhanced sensibility. 3 dwg