INFRARED DETECTOR FOR MEASUREMENT OF CONCENTRATION OF MOLECULES OF TOXIC GASES IN AIR FLOW Russian patent published in 2013 - IPC G01N21/35 

FIELD: measurement equipment.

SUBSTANCE: detector includes a light emitting diode optically connected to a measurement channel and through a folding mirror to a reference channel, each of which consists of in-series located photodiode, a differential amplifier and a synchronous detector, as well as a scale amplifier, a signal divider, a recording device and a scale amplifier. Outputs of synchronous detectors are connected to a subtracting device. The detector also includes a clock generator, a signal divider, a power amplifier and a recording device; at that, the clock generator is connected to synchronous detectors of measurement and reference channels, and through a power amplifier to a light-emitting diode.

EFFECT: improving measurement accuracy of concentration of toxic gases and operating reliability of the instrument owing to excluding mechanical moving parts of the device and using synchronous detection.

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