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Miniature infrared gas detection sensor

A technology of gas detection and sensor

Active Publication Date: 2014-07-30
西安坤瑞石油科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Infrared gas detection sensors in the prior art have the following defects and deficiencies: (1) At present, what are basically adopted in China are infrared gas detection sensors imported from abroad, resulting in high prices, and the price of each infrared gas detection sensor is 1500 ~2,500 yuan; (2) domestic mid-infrared light sources basically use filament light sources, which have high energy consumption, short life, and poor safety; (3) in the case of limited optical distance, the initial light intensity must be large, otherwise the light The absorbed amount is limited, so it is difficult to make the measured value accurate, but the increase of the initial intensity of light, on the one hand, will cause high energy consumption, on the other hand, the volume of the battery will increase, and the volume of the instrument will also increase, otherwise it will not meet the safety standard (AQ6211 -2008 standard) requires 10 hours of use, even if it can be used for 10 hours, it is very troublesome to charge every day

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0042] Such as figure 1 , figure 2 with image 3 As shown, the present invention includes a sensor housing 1 and an air chamber partition plate 5 that is arranged inside the sensor housing 1 and divides the air chamber inside the sensor housing 1 into two parts, an outer air chamber 3 and an inner air chamber 4. The air chamber partition plate 5 is provided with an opening, and the side edge of the air chamber partition plate 5 on one side of the opening is connected to the sensor housing 1, and the middle and lower part of the external air chamber 3 is provided with a The chamber 3 is divided into upper and lower partitions 14. The outer air chamber 3 is located below the upper and lower partitions 14 and is provided with a light-emitting part that passes through the upper and lower partitions 14 and is used to emit infrared light. Infrared light source 6, the upper part of the inner air chamber 4 is obliquely provided with a slant plate 7, the bottom of the inner air cham...

Embodiment 2

[0051] The difference between this embodiment and Example 1 is: the preparation method of the solid solution lead selenide thin film is: step 1, lead powder, water, anhydrous sodium sulfate and selenium powder are according to the mass ratio of 1:3:6:1 Mix, then stir at 90°C for 20 hours at a constant temperature, and obtain a solid material after filtration; step 2, make the solid material described in step 1 into a film with a thickness of 1.75mm; step 3, place the film described in step 2 in In a nitriding furnace, the temperature is 780° C., and the temperature is constant for 10 hours under a mixed atmosphere of nitrogen and hydrogen to obtain a solid solution lead selenide film. All the other structures are the same as in Example 1.

Embodiment 3

[0053] The difference between this embodiment and Example 1 is: the preparation method of the solid solution lead selenide thin film is: step 1, lead powder, water, anhydrous sodium sulfate and selenium powder are according to the mass ratio of 1:3:6:1 Mix, then stir at 80°C for 25 hours at a constant temperature, and obtain a solid material after filtration; step 2, make the solid material described in step 1 into a film with a thickness of 2 mm; step 3, place the film described in step 2 in a osmotic In a nitrogen furnace, at a temperature of 860° C. and a mixed atmosphere of nitrogen and hydrogen, a constant temperature treatment was carried out for 8 hours to obtain a solid solution lead selenide thin film.

[0054] The working process of the present invention is: the infrared light emitted by the mid-infrared light source 6 is first irradiated in parallel on the first outer reflective mirror 12-1 in the outer air chamber 3, and then irradiated into the second middle after ...

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Abstract

The invention discloses a miniature infrared gas detection sensor, comprising a sensor shell and a gas chamber partition board, wherein an opening is formed in the gas chamber partition board, the side edge located on one side of the opening of the gas chamber partition board is connected with the sensor shell, upper and lower partition boards and an intermediate infrared light source are arranged at the lower middle part in an external gas chamber, an inclined plate is obliquely arranged at the upper part of an internal gas chamber, a dual double-compensation pyroelectric infrared detector is arranged at the bottom of the internal gas chamber, two sensitive detector elements are integrated on the dual double-compensation pyroelectric infrared detector, a first light filter and a second light filter are respectively arranged on the upper surfaces of the two sensitive detector elements, and two semi-integral balls are arranged on the bottom surface of the inclined plate at an interval; a plurality of external reflection mirror surfaces are arranged on the inner wall of the sensor shell, a plurality of intermediate reflection mirror surfaces are arranged on the outer wall of the gas chamber partition board, and an internal reflection mirror surface is arranged on the inner wall of the side connected with the sensor shell of the gas chamber partition board. The miniature infrared gas detection sensor disclosed by the invention is small in volume, low in energy consumption, long in light path, high in gas detection stability and precision, high in reaction speed and long in service life.

Description

technical field [0001] The invention belongs to the technical field of intelligent sensors, and in particular relates to a miniature infrared gas detection sensor. Background technique [0002] In industrial production, flammable and explosive gas is the main danger of safe production, which not only causes casualties, huge property losses, but also pollutes the environment, and has received attention from all sides. [0003] At present, the methods for gas detection mainly include optical interference, carrier chemical reaction, thermal conductivity, infrared and other methods. [0004] The use of infrared absorption spectroscopy technology to detect gas concentration has high precision, reaction block, wide measurement range, long life, continuous analysis, and easy automatic control has become the focus of scientific and technological attention. According to the Beer-Lange infrared absorption law (I=I 0 × e -Kic , where I is the energy of infrared light absorbed by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3504G01N21/01
Inventor 李朝阳李东山
Owner 西安坤瑞石油科技有限公司
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