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Immersion leak test
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Technique in which the test object is pressurized and then submerged in detection fluid. the formation of bubbles from the object indicates a leak; the absence of bubbles indicates leaktightness. compare foam leak test.
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Pressurized, английский
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Infrared and thermal testing, английский
Nondestructive testing that uses heat diffusion and infrared radiation as interrogating energy.
Hot filament ionization gauge, английский
Absolute pressure gauge that monitors ion current proportional to gas density at pressures less than 0.1 pa (0.8 mtorr). electrons produced by a heated filament ionize the gas (the thermionic phenomenon) and produce a positive ion current that flows to a wire collector. this current is proportional to gas density over the absolute pressure range below 0.1 pa for a given gas composition. filaments may be of pure metal (such as tungsten), or oxide coated (such as yttria or thoria coated iridium). also called bayard-alpert gauge. compare cold cathode ionization gauge. 744 glossary i-k i
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