Measuring and testing – Fluid pressure gauge – Photoelectric
Patent
1981-03-23
1983-09-06
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Photoelectric
73 493, 73 52, 340605, 340626, G01L 900
Patent
active
044022247
ABSTRACT:
The invention discloses a monitoring device for monitoring vacuum pressure of an electrical device employing an evacuated envelope. The invention provide, particularly, a pressure responsive monitoring device which comprises an electric field generating device of vacuum type, an electric field detector means including a light source for generating light, an electric field detector detecting change of the electric field of the electric field generator due to the change of vacuum pressure inside the envelope and controlling the light depending upon the change of the electric field, and photoelectric converter for converting the light controlled by the electric field detector to an electric signal which is employed to monitor the vacuum pressure of the envelope.
REFERENCES:
patent: 3594754 (1974-07-01), Voshall
patent: 4103291 (1978-09-01), Howe et al.
patent: 4163130 (1979-07-01), Kubota et al.
Kabushiki Kaisha Meidensha
Woodiel Donald O.
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