Light source chopping structure of optical sensor

Abstract

The invention discloses a light source chopping structure of an optical sensor. The light source chopping structure comprises a chopping light source housing provided with a motor, wherein a light source bracket sleeved by a chopping wheel is embedded on the chopping light source housing, a base with a hole is arranged on the light source bracket, one end, corresponding to the hole of the base, is provided with a light source sealing plate inserted by a light emitting device in an embedding manner, a bracket sleeve used for sleeving the chopping wheel is arranged at the other end corresponding to the hole of the base, the bracket sleeve inserted by the chopping wheel is arranged in an inner cavity of the chopping light source housing in a sleeving manner, and is connected with an output shaft of a motor, the base of the light source bracket is fixedly connected with the chopping light source housing, and an optical material window body used for enabling the light-emitting device to emit light is arranged on the chopping light source housing. According to the light source chopping structure, chopping of an existing plane chopping piece is changed into chopping of the chopping wheel, and structures of the light-emitting device, the housing and the like are correspondingly changed, thus the volume of the whole chopping structure is greatly reduced, and the interference of outside gas to radial transmission is effectively isolated, so that the stability and the measurement precision of an instrument are improved when the light source chopping structure is applied to an infrared sensor.

Description

technical field [0001] The invention relates to an optical measuring instrument based on the optical principle, in particular to an optical sensor light source chopping structure. Background technique [0002] Modulation light sources commonly used in optical instruments, there are two methods of light intensity modulation: electrical modulation and mechanical modulation, among which mechanical modulation light sources are widely used in optical instruments, especially Infrared instruments are commonly used. The method involving mechanical modulation of the intensity of the irradiated light generally uses a planar chopper placed on the light path to modulate the light intensity. The planar chopper is a circle with a diameter of about 10 cm and 2 to 4 light-transmitting gaps. Shaped chopping plate, the chopping light source constructed by the traditional chopping plate, because the chopping plate needs a large circular movement space in the vertical direction of the optical ...

AI Technical Summary

Problems solved by technology

The method involving mechanical modulation of the intensity of the irradiated light generally uses a planar chopper placed on the light path to modulate the light intensity. The planar chopper is a circle with a diameter of about 10 cm and 2 to 4 light-transmitting gaps. Shaped chopping plate, the chopping light source constructed by the traditional chopping plate, because the chopping plate needs a large circular movement space in the vertical direction of the optical path, so the light-emitting components are arranged in the same chamber as the detection gas chamber and the receiving gas chamber. The position of the shaft is installed in series, and the light-emitting part is separated from the detection gas chamber by the chopper, and the motor shaft is also installed in parallel with the optical axis, so that the circular chopper of the installed sensor has complex structure and shape, mechanical parts, etc. It takes up a lot of space, it is difficult to integrate and assemble in the later stage, it is troublesome to install and fix, it is difficult to seal the whole, and the interference of external gas on light transmission cannot be avoided, etc.

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