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Leak detection knowledge

What is the working principle of helium leak detector?

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It is mainly composed of ion source, analyzer, collection amplifier and cold cathode ionization vacuum gauge. The ion source is gas ionization, forming a beam of ions with specific energy. The analyzer is a uniform magnetic field space, and the mass to charge ratio of different ions is different. In the magnetic field, the separation will be carried out according to the movement of different orbital radius, and only helium ions will fly out of the gap of the analyzer in the design; On the collector, the collector amplifier collects helium ion current and goes in and out of the current amplifier. The leakage rate can be known by measuring the ion current.
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