Air-sensitive characteristic response curve testing device with outer cover

Abstract

The invention discloses an air-sensitive characteristic response curve testing device with an outer cover. A heating piece is arranged at the bottom of a sample bearing table, a first air inlet pipe,a second air inlet pipe and an air outlet pipe are arranged on a flange disc, a universal bamboo joint pipe is connected to an air outlet end of the second air inlet pipe, the first air inlet pipe andthe second air inlet pipe are located above the sample bearing table, and the universal bamboo joint pipe is adjacent to the top surface of the sample bearing table; an inner cover is a transparent cover and externally covers the sample bearing table, the heating piece, a first probe, a second probe, the first air inlet pipe, the second air inlet pipe, the air outlet pipe and the universal bamboojoint pipe, an opening end of the inner cover is fixed with an outer round surface of the flange disc, the inner cover and the flange disc are sealed through an o-shaped ring, and a heating wire is arranged on the inner wall of the outer cover. Based on existing structures, the scheme has the beneficial effects that the non-removable transparent inner cover is additionally arranged, and the thermal insulation between the inner cavity of the inner cover and the outside is realized, so that the temperature isolation between the to-be-tested air-sensitive material and the outside is realized, and the influence caused by the external temperature to the air-sensitive characteristic is avoided.

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 with an outer cover. The device 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 t...

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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.

[0008] 4. The test object targeted by some gas-sensitive materials to be tested is liquid (such as alcohol) at room temperature. During the test, it needs to be heated to make it into a gaseous state, and it must be prevented from forming droplets after liquefaction during the test. Thereby ensuring the smooth progress of the gas sensitivity test, but the existing technology cannot realize

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