OPTICAL ABSORPTION GAS ANALYZER Russian patent published in 1998 - IPC

FIELD: measurement technology, devices determining concentration of gases. SUBSTANCE: proposed gas analyzer has two electromagnetic radiation sources with wave length $$$ of absorption region and wave length $$$ of region of transparency of analyzed gas, gas dish made in the form of cavity which internal surface with light-reflecting coat is focusing element, two photodetectors which record radiation when illuminated from two opposite sides. Optical filters letting radiation with wave length $$$ of absorption region pass to first photodetector and radiation with wave length $$$ of region of transparency of analyzed gas pass to second photodetector which are mounted on opposite sides of each photodetector in path of radiation of first and second electromagnetic radiation sources. Single-channel signal processing unit has commutator of input pulses, amplifier, analog- to-digital converter, microcomputer, circuit controlling currents of electromagnetic radiation sources. EFFECT: simplified design and improved operational stability of analyzer. 2 dwg