Gas leakage concentration quantitative detection device and method based on infrared thermal imaging technology

Abstract

The invention discloses a gas leakage concentration quantitative detection device and method based on an infrared thermal imaging technology. The device comprises a passive thermal infrared imager, aconcentration-measured value quantitative relation model is pre-stored in the passive thermal infrared imager, and a portable standard infrared air chamber is installed in front of a lens of the passive thermal infrared imager in a replaceable mode. During on-site inspection, the method adopts the passive thermal infrared imager to acquire three groups of data respectively, i.e. an infrared imageof a leakage point, an infrared image of a leakage-free scene and an infrared image of the leakage-free scene after a standard infrared air chamber is additionally arranged, and the passive infrared thermal imager can calculate the gas concentration of the on-site leakage point in real time according to the three groups of data and in combination with the concentration-measured value quantitativerelation model.

Description

technical field [0001] The invention relates to the field of gas detection, in particular to a gas leakage concentration quantitative detection device and method based on infrared thermal imaging technology. Background technique [0002] In petrochemical and other industries, there are a large number of dangerous gas storage or transportation equipment with complex structures. Effective monitoring of the leakage of these equipment is an important prerequisite for ensuring safe production. At present, contact leak detection equipment is widely used, and the sensor of the equipment needs to be in contact with the detection target gas to detect the leakage. However, some leaking points may be leaking, but most of the potential leaking points have not leaked yet, so the operator must personally check and detect each potential leaking point, which is very inefficient and will cause harm to the health and safety of the inspectors. harm. [0003] At present, the infrared thermal ...

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Problems solved by technology

However, it is still inefficient to search for leaks in the case of using this non-contact laser gas detector alone, and the real leak can only be found by detecting all possible leaks one by one

[0009] Through the above, it is not difficult to find that if the quantitative detection of the leaked gas concentration is to be realized at the same time, the thermal imaging camera for gas leak detection must be used in conjunction with at least one set of auxiliary equipment such as a contact electrochemical sensor or a non-contact laser gas detector. The number of equipment is large, the volume is large, and it is difficult to carry, which brings a lot of inconvenience to the on-site operation

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