A coaxial device has been developed which makes it possible to pinpoint a leak in a piece of vacuum hardware or tubing within a space of one‐sixteenth of an inch. The device consists of a delivery tube which directs the helium to a precise spot and a coaxial outer tube which pumps away the excess helium. This arrangement prevents diffusion or drift to a real leak in close proximity of the test area.
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Letter| May 01 1987
Coaxial helium leak detection probe
G. L. Fowler; Coaxial helium leak detection probe. J. Vac. Sci. Technol. A 1 May 1987; 5 (3): 390–391. https://doi.org/10.1116/1.574170
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