Gas sensitivity characteristic response curve test device

Abstract

The invention discloses a gas-sensing characteristic response curve test device. The bottom of the sample carrier is provided with a heating plate, and the top surface of the sample carrier is used to carry the gas-sensitive material to be tested; the flange is provided with a first air inlet pipe, a second Two air inlet pipes and air outlet pipes, wherein the outlet end of the second air inlet pipe is connected with a universal bamboo pipe, and the first air inlet pipe and the second air inlet pipe are located above the sample carrier, and the universal bamboo pipe is close to the sample carrier. Top surface; the inner cover is a transparent cover, and the inner cover covers the sample carrier, the heating plate, the first probe, the second probe, the first air inlet pipe, the second air inlet pipe, the air outlet pipe and the universal bamboo tube , and the opening end of the inner cover is fixed to the outer circular surface of the flange, and the inner cover and the flange are sealed by an o-ring. In this case, on the basis of the existing structure, a non-detachable transparent inner cover is added. The inner cavity of the inner cover is insulated from the outside, so that the gas-sensitive material to be tested can be isolated from the temperature of the outside world, thereby avoiding the temperature of the outside world. Effect on gas-sensing properties.

Description

technical field [0001] The invention belongs to the field of gas-sensitive materials and gas-sensitive sensors, and in particular relates to a gas-sensitive characteristic response curve testing device, which can also be used in other fields related to gas pressure and components. Background technique [0002] As is well known to those skilled in the art, a gas sensor is made of a gas-sensitive material and is used to measure the type, concentration and composition of a gas, to detect a specific composition in the gas, and to convert the composition parameter into an electrical signal. Or device, it is also called gas sensor. The applications of gas sensors mainly include: carbon monoxide gas detection, gas gas detection, gas detection, Freon (R11, R12) detection, ethanol detection in exhaled breath, human oral bad breath detection, etc. [0003] The gas-sensing characteristic response curve of the gas-sensing material is an important parameter of the gas-sensing material, ...

AI Technical Summary

Problems solved by technology

[0005] 1. Since the existing test device has an open structure and is in contact with external temperature, light and impurities, it is impossible to isolate the influence of external temperature, light and impurities on the gas-sensing characteristics, resulting in the test accuracy of the gas-sensing characteristic response curve not tall;

[0006] 2. The existing structure is an open structure, and the gas-sensitive material has adsorption on gas, which leads to the unstable state of the gas near the surface of the gas-sensitive material to be tested during the test, with large randomness and irregular changes, which leads to test results Low reliability and poor repeatability of test data, making gas sensitivity testing meaningless

[0007] 3. During the test, it may be necessary to load light of a specific wavelength under the premise of shielding the external temperature, light and impurities in order to study the influence of light on the response curve of the gas sensitivity characteristic. However, the existing technology cannot meet this technical requirement at all.

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