Photodiode

Details Photodiode Photodiode

1984-10-31

1986-09-30

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Ultraviolet light responsive means

250373, 313539, 313542, H01J 4016, G01N 2133

Patent

active

046148710

ABSTRACT:
A non-evacuated photodiode for detecting far-uv radiation. The photocathode is a cylindrical element surrounded by an annular anode. The photocathode is constructed of a metal (e.g., nickel) that emits electrons only in response to far-uv radiation of 140 nanometer or shorter wavelengths. A window (e.g., magnesium fluoride) is positioned at the entrance to the photodiode, to filter out far-uv radiation with wavelengths shorter than about 100 nanometers. The window and photocathode material serve to make the photodiode sensitive to radiation in a wavelength range to greater than 100 to 140 nanometers. A high-temperature perfluoroethylene material is used as an insulating layer for spacing the window from the anode and for spacing the anode from the photocathode. The photodiode is used in a gas chromatography detector.

REFERENCES:
patent: 1917854 (1933-07-01), Rentschler
patent: 3638059 (1972-01-01), Taylor
patent: 3771005 (1973-11-01), Erickson
Sampson, J. A. R., "Vacuum Ultraviolet", Wiley, 1965, pp. 224-245.
Canfield, L. R., Johnston, R. G., and Madden, R. P., "NBS Detector Standards for the Far Ultraviolet", Applied Optics, Jul. 1973, vol. 12, No. 7, pp. 1611-1617.
Driscoll, J. N. and Ferioli, P., "Detector for GC Works in Far UV", Research & Development, Sep. 1984, pp. 104-107.

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