Patent ID: 9234837
Filing Date: 2016-01-12
CPC Classification: G01N

Claim Text:
1. An optical gas analyzer, comprising: an optical gas cell to pass infrared (IR) radiation therethrough, an IR source, located at the inlet of the optical gas cell, a detector of the IR radiation, located at the outlet of the cell, and a control unit, connected to the IR radiation source and the IR radiation detector and adapted to change operation modes of the IR radiation source and to process the IR radiation received by the detector, to display a gas concentration result of the processing, wherein the optical gas cell is made mirrored and multi-path and adapted to concentrate the IR radiation passing therethrough on the IR radiation detector, wherein the IR radiation detector comprises a differential receiving device, a filter window, and a filter mirror, the differential receiving device comprising a measuring photovoltaic detector and a reference photovoltaic detector, the filter window being located at the inlet of the IR radiation detector, the filter mirror, being located inside the IR radiation detector, the filter window and filter mirror being adapted to compensate external influence upon the IR radiation path trajectory within the cell on the gas concentration result, resulting spectral transmission and reflection characteristics of the filter window and filter mirror being correlated with the absorption spectrum for the gas to be measured and with the radiation spectrum of the IR radiation source, respectively, the radiation spectrum of the IR source being in the range between about 2.8 and about 3.8 μm, the transmission spectrum of the filter window being in the range between about 2.8 and about 3.8 μm, the transmission spectrum of the filter mirror being in the range between about 3.1 and about 3.5 μm, and wherein the IR radiation source includes an infrared impulse source of the LED type.