Optical system for multi-channel infrared detector

Abstract

The embodiment of the invention discloses an optical system for a multi-channel infrared detector. The system comprises an infrared light source, a concave collimating reflector, at least one plane reflector, a concave reflecting sub-mirror array and a multi-channel infrared detector, wherein the infrared light source is used for emitting an infrared light beam; the concave collimating reflector is used for reflecting and collimating the infrared beams; the plane mirror is used for prolonging the light path of the infrared light beam; the concave reflection sub-mirror array comprises a plurality of sub-mirrors; and detection channels in the multi-channel infrared detector are in one-to-one correspondence with the sub-mirrors. According to the system provided by the embodiment of the invention, the gas absorption length can be increased by prolonging the light path, so that the gas detection sensitivity is improved, and the light collection capability of a detection channel in the multi-channel infrared detector can be improved by focusing the infrared light beams by the sub-mirrors in the concave surface reflection sub-mirror array, so the sensitivity of the multichannel infrared detector is improved.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to an optical system for a multi-channel infrared detector. Background technique [0002] For low-cost multi-component infrared gas sensing applications, the use of broadband infrared light sources, multi-channel infrared detectors, and short optical path absorption cells is a widely adopted technical solution. Typical broad-spectrum infrared light sources include heating filament sources and resistive film heating sources based on MEMS technology, all of which have broad-spectrum and large divergence angle radiation distributions similar to black body thermal emission. [0003] The so-called multi-channel infrared detector refers to a detector that contains multiple detection units and can detect different wavelengths at the same time. Generally, each channel or detection unit has a narrow-band filter. In an N-channel infrared detector, usually N-1 channels are signal channels fo...

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Problems solved by technology

[0004] For multi-channel infrared detectors, due to the relatively large interval between infrared sensitive units in adjacent channels, the actual area to be irradiated greatly exceeds the area of ​​the focal spot of the lens, so the receiving plane of the detector is not exactly on the focal plane of the lens , but on a larger spot near the focal plane of the lens, which causes the energy density received by the sensitive units of each signal channel on the detector to be greatly reduced, affecting the sensitivity of the multi-channel infrared detector and the lower limit of gas detection

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