Air ion detection device and calibration method thereof

Abstract

The invention discloses an air ion detection device and a calibration method thereof. The device includes: case, sampling head, sensor, mass flow controller, vacuum pump, micro-current amplifier, control module and power module; the case is a constant temperature case, and the sampling head is detachably installed outside the case for collecting air and sensor Inside the sampling head, the bottom of the sensor is connected to the mass flow controller and the vacuum pump in turn through the gas pipe, the sensor’s collection rod is connected to the micro-current amplifier through the BNC connector and the coaxial cable, and the control module is connected to the mass flow controller, the vacuum pump and the micro-current amplifier respectively. Connection for controlling the air flow and calculating the air ion concentration, the power module is connected to the control module. The air ion detection device and its calibration method of the present invention can detect and control the air flow passing through the sensor in real time, and can perform irregular calibration on the air flow and the amplifier, so as to ensure the measurement accuracy of the air ion concentration.

Description

technical field [0001] The invention relates to the technical field of environmental detection, in particular to an air ion detection device and a calibration method thereof. Background technique [0002] At present, most of the instruments used to measure the air ion concentration are air ion concentration testers. The existing air ion concentration testers usually use flat-plate collectors to collect air ions. The polarization of air ions between the polarizing plate and the collecting plate Under the action of the electric field, the charges with different polarities are transferred to the polarizing plate and the collecting plate to form a current and calculate the concentration of ions in the air; but due to the influence of air humidity and temperature, the existing The measurement accuracy of the flat-panel air ion tester is relatively low. Among them, in order to reduce the influence of air humidity and temperature changes on the measurement results, the existing ai...

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Problems solved by technology

[0004] Because the existing air ion concentration tester is equipped with a fan, the air flow and flow velocity of the tester will be unstable during the test, and it is easy to form turbulence; the existing tester does not measure the air flow. In this case, the stability of the air flow cannot be guaranteed, which will seriously affect the measurement accuracy of the air ion concentration; the existing tester has no temperature control, and there will be serious temperature drift during the test, resulting in inaccurate measurement results; in addition, the existing The tester cannot calibrate the air flow and amplifier, which may skew the final measurement

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