Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1986-06-09
1987-11-03
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
340540, G08B 2100
Patent
active
047045400
ABSTRACT:
A shock wave detection system used in a vacuum protection system constructed so that a high-speed shutter provided in a vacuum pipe connecting a vacuum system with an experimental apparatus is closed in response to the detection of an atmospheric shock wave that will rush into the vacuum system when an accidental vacuum breakdown occurs at the experimental apparatus. This shock wave detection system comprises an incident light window and an outgoing light window that are provided on the side of the vacuum pipe at the positions opposite to each other, an optical system for entering the light flux linearly polarized or not polarized the incident light window, another optical system for focusing the light flux outgoing from said outgoing light window, an optical fiber for receiving on its surface a diffraction image produced due to the change of light refractivity when the wave front of the shock wave crosses said light flux in the vacuum pipe, and a photo-detector for transforming the diffraction image into a signal for driving the high-speed shutter.
REFERENCES:
patent: 3731743 (1973-05-01), Marshall
patent: 3885162 (1975-05-01), Geertz
patent: 4297687 (1981-10-01), Fuzzell
patent: 4544273 (1985-10-01), Berndt
patent: 4553139 (1985-11-01), Tanigaki et al.
Hitachi , Ltd.
Nelms David C.
Oen William L.
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