Infrared gas sensor
A gas sensor, infrared technology, applied in the direction of instruments, scientific instruments, measuring devices, etc., can solve the problems of reduced reflection efficiency, loss of luster on the inner wall of the optical path, and reduced sensor accuracy, so as to improve accuracy, improve accuracy and anti-interference ability, eliminate The effect of signal drift
Inactive Publication Date: 2020-05-29
PROMISENSE ELECTRONICS TECH CO LTD
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However, dual channels inevitably increase the complexity of the optical path. As far as the direct optical path is concerned, under the condition that the length of the signal channel remains unchanged, L signal -L ref
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[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0025] see Figure 1 to Figure 5 Shown is a schematic structural diagram of an infrared gas sensor in a preferred embodiment of the present invention. It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbitrarily during actual implementation, and the component layout type may also be more complicated.
[0026] see figure 1 and 2 As shown, it is an infrared gas sensor for measuring the concentration of ...
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The invention provides an infrared gas sensor. The sensor comprises a light source module, a light path module, a signal detection module and a circuit module in communication connection with the light source module and the signal detection module. The infrared gas sensor further comprises a light filtering module, a transflective module and a reference detection module, wherein the light filtering module and the transflective module are sequentially arranged between the light source module and the light path module; the reference detection module is connected to the transflective module and connected with the circuit module; interference gas capable of filtering out part of infrared light interfering with target gas in the infrared light emitted by the light source module is stored in thelight filtering module in a sealed mode. The transflective module can reflect the infrared light filtered by the light filtering module to the reference detection module and transmit the infrared light to the signal detection module. The infrared gas sensor disclosed by the invention is high in measurement precision and strong in anti-interference capability and is used for improving the problemof zero drift of a detection signal of an NDIR sensor in the prior art.
Description
technical field [0001] The invention relates to the field of infrared gas detection, in particular to an infrared gas sensor with high resolution and strong anti-interference ability to external environment changes. Background technique [0002] Non-dispersive infrared gas sensing (NDIR) technology is a gas sensing technology with high precision, good stability and long life. The light intensity contrast calculates the concentration of the gas, and Beer-Lambert's law: I=I 0 • exp(-μCL). Among them, I is the infrared light intensity reaching the detector when there is gas absorption, and I 0 is the light intensity when there is no gas absorption, C is the gas concentration in the chamber, L is the length of the chamber or the path length of infrared light, and μ is the absorption coefficient of the gas. Therefore, an NDIR sensor includes at least an infrared light source for generating infrared light, an infrared filter for filtering the infrared light from the infrared li...
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IPC IPC(8): G01N21/3504G01N21/01
CPCG01N21/3504G01N21/01
Inventor俞骁郭安波王新国刘玮吉泽欢
OwnerPROMISENSE ELECTRONICS TECH CO LTD