Abstract
Preliminary work on a spectral analysis type leak detector is described.The detector consists of a discharge tube, a spectrometer, a photomultiplier and an amplifier. An electrodeless discharge tube which is attached to the vacuum system is operated by a high frequency current of about 100 megacycles modulated by 60 cycles. The emitted light from the discharge tube is dispersed by a constant deviation prism spectrometer and received by a photomultiplier 1P 21. The audio frequency parts of the signals from 1P 21 are amplified and rectified so as to operate a D.C. milliammeter.When each small quantities of air, hydrogen and helium is introduced to the vacuum system through an adjustable leak valve, several peaks corresponding to the spectral lines characteristic of the gases appears in the meter. In the present experiment, the practically detectable leak quantities are about 104mmHg 1/sec for hydrogen and 105mmHg 1/sec for helium.Comparing with the mass spectrometer type leak detector, the new detector has the following features : 1) No need of vacuum system in the detector, 2) Portable and durable constructions, 3) Simple circuit and prompt operation.
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