Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1995-09-22
1997-08-12
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
313103R, 313105R, 313534, H01J 4300
Patent
active
056568070
ABSTRACT:
A 360.degree. surround photon detector/electron multiplier having: i) a continuous annular inner wall formed of thin light-transmissive material defining an internal coaxial detection chamber; ii) an annular enclosed evacuated envelope integral with the inner wall; iii) a cylindrical photocathode positioned adjacent the vacuum side of the inner wall; and iv), an electron multiplier assembly housed within the envelope for multiplying photoelectrons emitted from the photocathode and operable as a plurality of adjacent, circumferentially arrayed electron multipliers, each including an output terminal. The outputs originating from various segments of the photocathode may be utilized with coincidence circuitry requiring simultaneous detection of light events in at least two different sections of the photocathode in order to eliminate spurious signals such as result from thermal electron emissions from the photocathode. The outputs may also be utilized to facilitate use in spectroscopic analysis, differentiating portions of the spectrum of light reaching the photocathode through an optional composite cylindrical array of adjacent light filters, each having different wavelength bandpass characteristics, which may be aligned with the electron multiplier sections and positioned within the detection chamber in close proximity to, and surrounded by, the inner wall of the envelope. Where possible, light-emitting sources or samples are placed within the detection chamber. Optionally, a reflector is positioned coaxially within the detection chamber to facilitate detection of light emanating from sources outside the detection chamber--e.g., i) external scintillation or luminescent samples, etc.; or ii), astronomical or other external light sources requiring collimators, microscopes, telescopes or the like.
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Cassidy, P.S. J. Robert
Lee John R.
Westin Edward P.
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