Method for detecting leakage of sealed object by using infrared imaging technique

Abstract

A method for detecting the leakage of sealing object using the infrared imaging technique is disclosed that includes control device, infrared imaging technique, detection device and aerating device that characterized in that: the control device controls the valve to aerate the detected object and analytical judge automatically, and the control device collects the signal which is from the pressure sensor and temperature sensor by the inner analog / digital signal interface, and calculates the leakage amount, and at the same time the leaking point and leakage amount is determined by the pattern recognition and digital processing. The invention applies the infrared imaging technique for detecting the leakage of sealing object, and that can detect the leaking point and leakage amount quickly and accurately.

Description

(1) Technical field [0001] A method for detecting leakage of a sealed object, in particular a method for detecting leakage of a sealed object by using infrared imaging technology. (2) Background technology [0002] There are many ways to detect the leakage of sealed objects, such as filling the object under test with a certain pressure of gas (air is generally used as the medium), and then observe the pressure drop through the pressure gauge to check whether there is leakage; the advantage is that the method is simple, but due to The direct pressure is used to detect the pressure drop, the resolution is low, and it is difficult to detect when the leakage is small, and the detection result is greatly affected by the ambient temperature and the specific location of the leakage point cannot be determined. There is also a differential pressure leak detection method, which is to connect two identical measured objects (one of which has no leakage) to the two ends of the differenti...

AI Technical Summary

Problems solved by technology

[0002] There are many ways to detect the leakage of sealed objects, such as filling the object under test with a certain pressure of gas (air is generally used as the medium), and then observe the pressure drop through the pressure gauge to check whether there is leakage; the advantage is that the method is simple, but due to Direct pressure is used to detect pressure drop, the resolution is low, and it is difficult to detect when the leakage is small, and the detection result is greatly affected by the ambient temperature and the specific location of the leakage point cannot be determined

There is also a differential pressure leak detection method, which is to connect two identical measured objects (one of which has no leakage) to the two ends of the differential pressure manometer, and then fill the two measured objects with a certain pressure of gas at the same time, and observe The pressure difference between the two ends of the differential pressure manometer changes; its advantage is that it can offset the influence of the ambient temperature on the two measured objects, but it needs a measured object without leakage, and the specific location of the leak point cannot be determined

Another method is to immerse the measured object in water and check whether there is any leakage by observing the air bubbles. The advantage is that the method is relatively simple and the specific location of the leakage point can be known, but it is not easy to accurately calculate the leakage amount.

Other detection methods include helium mass spectrometry leak detection and hydrogen leak detection, that is, by filling helium or hydrogen into the measured object at a certain pressure, and then using a sensitive device for helium or hydrogen to detect whether there is helium or hydrogen from the Leakage from the measured object; its advantage is high detection accuracy, but it needs to be filled with special gas and the cost is high and the process is complicated