Patent ID: 9709498
Date: 2017-07-18
CPC Classifications: G01N

Claim:
1. A gas-sensor arrangement for measuring a target-gas concentration, the arrangement comprising: first and second separate nondispersive infrared-radiation emitters to one side of a space containing the target gas and projecting respective first and second beams of infrared light from the one side through the space to the other side thereof; an infrared-radiation receiver on the other side of the space and having first and second parts each positioned to be irradiated by only a respective one of the first and second beams projected by the emitters through the space for emitting first and second outputs respectively corresponding to the first and second beams and together forming a receiver signal corresponding to radiation received from the first and second beams, one of the emitters being optically farther from the receiver than the other of the emitters; a filter between the receiver and the space, traversed by the first and second beams, and permeable only to radiation of a wavelength range that corresponds to the target gas; and a controller connected to the radiation receiver for calculating the target-gas concentration on the basis of the receiver signal.