Abstract
An ultrasensitive hydrogen detector is described which has a detection sensitivity of a few parts per billion in the gas stream. The detector's performance, range, and accuracy were evaluated by analyzing titanium standards from NBS containing known amounts of hydrogen at the following levels: 32±5, 98±5, and 215±6 ppm. The fractional random error in the mean value of these standards at 95% confidence level was found to be ±5.01%, ±1.67%, and ±1.08%, respectively. The detector has been used on surface contamination, corrosion, hydrogen concentration gradient, and hydrogen embrittlement studies. When two such detectors are connected in a Y configuration, the system becomes a vacuum gauge calibrator which does not involve a flowmeter. The principle of operation and highlights of the above studies are presented along with the sensitivity factor for a Bayard–Alpert-type ionization gauge for hydrogen gas.
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