Beta-ray atmospheric particulate monitor and monitoring method thereof

Abstract

The invention provides a beta-ray atmospheric particulate monitor with high monitoring efficiency and high monitoring precision as well as a monitoring method of the Beta-ray atmospheric particulate monitor. The beta-ray atmospheric particulate monitor comprises a whirlwind sampling head, a dehydrating device, a particulate collecting hole, a paper tape transmission device and a flow sensor, wherein the dehydrating device is located below the whirlwind sampling head; the particulate collecting hole is located below the dehydrating device; the paper tape transmission device is used for moving the paper tape; the flow sensor is located below the dehydrating device and the paper tape; the flow sensor is connected with an automatic throttle which is connected with a vacuum pump; the flow sensor is connected with a main control circuit; a C14 radioactive source is arranged at one side of the dehydrating device; beta-ray detectors are arranged below the C14 radioactive source and the paper tape; the beta-ray detectors are connected with a signal processing unit which is connected with the main control circuit; and the main control circuit is also connected with a display, the dehydrating device and the paper tape transmission device.

Description

technical field [0001] The invention relates to a monitoring instrument, in particular to a beta ray atmospheric particle monitoring instrument and a monitoring method thereof. Background technique [0002] Air pollution is caused by one or more pollutants in the gaseous, aerosol or particle state present in the atmosphere, which can cause harm or abnormal effects to humans and other living things. Air pollution has a wide range of sources and a wide range of influences, and it has become a worldwide problem. [0003] Air pollutants mainly enter the human body through the respiratory tract. The size of the particles is different, the parts that are inhaled and deposited in the respiratory system are different, and the harm to the body is also different. Those larger than 5 μm mostly stay in the upper airway, and those smaller than 5 μm mostly stay in the bronchioles and alveoli. The smaller the particle, the deeper it can penetrate. Recent studies have found that fine pa...

AI Technical Summary

Problems solved by technology

The problem with the FH62C14 series particle monitor produced by Thermo is that the β-ray counter is placed under the particle collection port. During the sampling process, the detection surface of the counter is exposed to the 16.7L / min airflow, which will accelerate the damage of the counter and the contamination of the detection surface. , which affects the service life and detection efficiency of the counter; the problem with the BAM 1020 series particle monitor produced by Met One is that the existing paper feeding mechanism drives the paper tape to move through the rotation of the claw pole motor, and the accuracy of the paper tape movement is determined by the contact with the claw pole. The number of rotations of the finale shaft connected to the motor is achieved, so it is affected by factors such as machining accuracy and paper tape tightness.

At the same time, the two instruments use traditional heating methods, which will lose organic volatiles in the air and affect the test results.

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