NDIR technology-based infrared gas sensor
A gas sensor and infrared technology, applied in the field of sensors, can solve the problems of large volume and short optical path, and achieve the effect of long optical path, small volume and accurate detection results
Pending Publication Date: 2020-11-03
成都凯能光电科技有限公司
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[0004] The purpose of the present invention is to provide an infrared gas sensor based on NDIR technology, which aims to solve the problems of large volume and short optical path of gas sensors in the prior art
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[0029] Please also refer to Figure 2-4 , as an embodiment of the present invention, the annular optical path conduction assembly 3 includes a first reflector 32 disposed inside the gas chamber 311, the first reflector 32 has a first reflective end face, preferably, the first reflective end face and the light source The optical path of the infrared light emitted by the module 1 forms an included angle of 45 degrees. The angle between the first reflector 32 and the optical path is 45 degrees, which can gather the infrared light emitted by the light source module 1 on the first reflector 32 as much as possible, and reflect the infrared light to the gas chamber 311 through the first reflective end surface At the same time, it can also reduce the light loss caused by light scattering when the infrared light is irradiated from the light source module 1 .
[0030] Preferably, the optical path of the infrared light emitted by the light source module 1 is perpendicular to the horizon...
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The invention relates to the technical field of sensors, and discloses an NDIR technology-based infrared gas sensor, which comprises a light source module for generating infrared light, a detection module for receiving the infrared light, and an annular light path conduction assembly for conducting the infrared light emitted by the light source module to the detection module; the annular light path conduction assembly comprises a shell, a gas cavity used for containing gas to be detected is formed in the shell, the light source module and the detection module are both arranged in the gas cavity, and infrared light emitted by the light source module irradiates the detection module after being reflected multiple times in the gas cavity. The detection module detects the gas concentration of the target gas in the gas chamber according to the intensity of the received infrared light. According to the infrared gas sensor based on the NDIR technology provided by the invention, light is reflected for multiple times in the gas chamber, so that the optical path of the sensor is longer, the detection result is more accurate, and meanwhile, the size of the sensor is smaller.
Description
technical field [0001] The invention relates to the technical field of sensors, in particular to an infrared gas sensor based on NDIR technology. Background technique [0002] The infrared gas sensor based on NDIR (non-dispersive infrared technology) technology uses a broad-spectrum blackbody radiation source as the light source of the infrared sensor, and the light passes through the measured gas in the optical path and reaches the infrared detector. Its working principle is based on the near-infrared spectrum selective absorption characteristics of different gas molecules, and uses the relationship between gas concentration and absorption intensity (Lambert-Beer law) to identify gas components and determine their concentration. [0003] Wherein, the longer the optical path traveled by the light in the sensor, the more accurate the detection result obtained by the sensor. The optical path of the existing NDIR gas sensor is mostly linear optical path. In order to make the d...
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IPC IPC(8): G01N21/3504G01N21/01
CPCG01N21/3504G01N21/01
Inventor 肖龙伟张文勇陈永刚牟晓晖
Owner 成都凯能光电科技有限公司