Air-sensitive characteristic response curve testing device with stirring blades

Abstract

The invention discloses an air-sensitive characteristic response curve testing device with stirring blades. A heating piece is arranged at the bottom of a sample bearing table, and the surface of thesample bearing table is used for bearing a to-be-tested air-sensitive material; a first air inlet pipe, a second air inlet pipe and an air outlet pipe are arranged on a flange disc, and a universal bamboo joint pipe is connected to an air outlet end of the second air inlet pipe; a stirring bracket is arranged in an inner cavity of an inner cover, a groups of driven magnets are fixedly arranged atthe outer end of the stirring bracket along the circumferential direction and are N-pole magnets, and the outer round surfaces of the driven magnets are in running fit with the inner wall of the innercover; and a connecting shaft is coaxially and fixedly arranged in the center of the stirring bracket, and a group of stirring blades are uniformly at each of two ends of the connecting shaft along the circumferential direction. 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 influencecaused 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 stirring blades. 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 ...

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. In the process of academic research, we found that in some test environments, the gas concentration and temperature field near the gas-sensitive material to be tested need to be uniform, so as to prevent the uneven gas concentration and temperature field from interfering and hindering the test. However, the existing technology can't solve

[0008] 4. 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.

Images