Electron discharge device having a narrow range spectral respons

Details Electron discharge device having a narrow range spectral respons Electron discharge device having a narrow range spectral respons

1985-10-11

1987-07-14

Boudreau, Leo H.

Electric lamp and discharge devices

Photosensitive

With optical device

313539, 313541, 313112, H01J 4002, H01J 4328

Patent

active

046805044

ABSTRACT:
A so-called "solar-blind" photomultiplier tube includes an envelope having a sidewall and an input faceplate formed from an ultraviolet transmitting filter. A photoemissive cathode is disposed within the envelope for providing photoelectrons in response to radiation incident thereon. The cathode has an intrinsic responsivity extending from the near-ultraviolet portion through the visible portion of the electromagnetic spectrum; however, the filter faceplate transmits only the ultraviolet portion of the spectrum to the photoemissive cathode. The combination of the filter faceplate and the photoemissive cathode therefore limits the tube to a responsivity within the wavelength range of about 300 to less than 400 nanometers.

REFERENCES:
patent: Re30249 (1980-04-01), Faulkner
patent: 2470666 (1949-05-01), Suffield
patent: 2655452 (1953-10-01), Barnes et al.
patent: 2676282 (1954-04-01), Polkosky
patent: 3143683 (1964-08-01), Duncan et al.
patent: 3247413 (1966-04-01), Bisso et al.
patent: 3753023 (1973-08-01), Sommer
patent: 3793552 (1974-02-01), Glascock, Jr. et al.
patent: 4196257 (1980-04-01), Engstrom et al.
patent: 4306188 (1981-12-01), Ibaugh
patent: 4405881 (1983-09-01), Kobayashi
RCA Electro-Optics Handbook, pp. 13 and 14 (1974).
Handbook of Optics, W. G. Driscoll, Editor, McGraw-Hill, pp. 7-24 (1978).
Product Bulletin 150X8S, EIMAC, San Carlos, CA, FIG. 5, (1011968).

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