A Portable Trace Gas Detection System

Abstract

The invention discloses a portable trace gas detection system. The portable trace gas detection system comprises a sampling module, a detection module and an equipment master controller. The sampling module comprises an enrichment tube and a heating wire, wherein the enrichment tube is used for collecting and enriching gas samples within a predetermined enrichment time; and the heating wire is positioned in the enrichment tube and used for heating the gas samples in the enrichment tube, so as to release the gas samples concentrated in the enrichment tube by means of heating. The detection module comprises a sensing chamber, a check valve and a sensor array, wherein an inlet of the sensing chamber is communicated with an outlet of the enrichment tube through a first pipeline; the check valve is installed on the first pipeline; and the sensor array is positioned in the sensing chamber and used for detecting the gas samples sampled by the enrichment tube when the check valve is switched on. The equipment master controller is used for controlling the heating time of the heating wire, the switching on and off of the check valve, and the operation of the sensor array according to the enrichment time, and receiving a detection signal of the sensor array for data acquisition and processing.

Description

technical field [0001] The invention relates to a body detection system, in particular to a portable trace gas detection system. Background technique [0002] Gas detection equipment is widely used in air pollution control, food quality assessment, explosives alarm, poisonous gas monitoring, biochemical warfare agent early warning, medical diagnosis and other fields. [0003] The detection of gas components is generally divided into the following methods: 1) Chromatography, which has high precision and sensitivity, but the equipment is bulky and requires pure carrier gas, which is suitable for laboratory applications. The detection of gas components is carried out through the process of on-site sampling and offline analysis in the laboratory. 2) The optical method has high equipment precision and requires a stable external environment. 3) Semiconductor and electrochemical methods can test certain gas components in a targeted manner. The concentration of gas objects that ca...

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Problems solved by technology

2) The optical method, the equipment has high precision and requires a stable external environment

[0004] In more and more gas detection applications, the efficiency of on-site sampling followed by chromatographic analysis under laboratory conditions can no longer meet the detection needs, especially in high-risk situations such as toxic gas leakage monitoring, battlefield biochemical warfare agent detection, etc. High detection capability, real-time fast, portable and lightweight gas detection equipment is more needed to provide real-time danger alarm signals, and optical detection methods such as optical interference method and differential absorption spectroscopy are difficult to adapt to these harsh field conditions, and it is difficult to ensure stable and reliable detection. Work

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