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Evan Smith
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Helium Leak Detection Using High Pressure and High Temperatures
unalloyed gallium, etc. The second type of Helium detection device is the Vacuum System. It is important to note that both types of devices use vacuum systems to measure the amount of H

BriefingWire.com, 1/24/2021 - There are two primary methods for Helium Leak Detection : central testing or remote testing. The decision of which method to employ actually depends upon the situation, and what the end result will be utilized for. The central (naked) testing method clearly shows whether or not there's a leakage (often, only a few different leaks) - the remote (off-site) method reveals if there are several different leaks, and the results can also be interpreted with regards to whether or not the gas is stable, moving out of a certain pattern, etc. Holes in the fabric of an object would show up in either type of test. Of course, leakage cannot be detected by the naked eye - the other method involves high-tech equipment that can detect the presence of any flaws in a material. This equipment is called a Helium Leak Detection System (HLDS).

In the case of central tests, Helium gas is applied via electrodes to the material being tested. The electrodes act as probes, and they are placed within a material that has been prepared for this purpose. Various experiments involving the detection of bubbles, lines, or waviness (which is a common sign of helium leakage) take place. A high-tech analyzer like a mass spectrometer is used to determine the parameters of these experiments, so that the data can be interpreted.

The remote testing method of Helium leak detection uses an analytical instrument similar to a mass spectrometer. However, rather than the sample being analyzed in a lab, it is performed in an enclosed area. In other words, the analysis can be done in a nearby airtight space, but the analytical work can't be completely performed in an isolated laboratory. Because of this, it is necessary to maintain the proper room pressure. The pressure can be maintained by varying the amount of nitrogen in the surrounding air.

The second type of Helium Leak Detection (also known as Helium Flux Detection) involves the use of non-intrusive methods of Helium measurement. These include such methods as electron microscopy, which uses electron beams to investigate Helium leakage. Electron microprobe with attached atomic source can also use the presence of positron emission with high-energy light to illuminate defects in a material. Other non-intrusive methods include infrared spectroscopy, which uses infrared energy to determine if Helium is present or absent.

As opposed to the above mentioned Helium Leak Detection methods, another widely employed technique for Helium leak detection is by using pressurized chambers. When implemented properly, this method can prevent the loss of a significant amount of material during Helium leak testing. To achieve this, the test subject is held in a very rigid position. At the same time, the amount of gas created within the chamber is measured. If the leakage is detected, additional gas will be added until the equilibrium is achieved. This type of Helium leak testing can be a bit time-consuming because of the need to continuously monitor the gas level.

 
 
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