Radiant energy – Invisible radiant energy responsive electric signalling – Semiconductor system
Patent
1987-10-20
1990-01-02
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Semiconductor system
25037008, 25037010, 25037014, 357 30, H01L 2714
Patent
active
048915211
ABSTRACT:
A detector for counting low levels of photons comprises a plurality of thin solid state wafers of a photons sensitive material such as gallium arsenide; the wafers being of the order of one-tenth to two millimeter thick depending upon use, and providing a depletion layer of 2 to 20 millimeters deep depending upon the energy of the photons to be detected. The electrical length of the wafer depends upon the use for which the panel is designed and may be one-tenth to two millimeters if two dimensional analysis is desired. Some of the wafers depending upon their materials have a region beyond the 2 to 20 millimeter depth in which is formed an integrated circuit including a detector, preamplifier, discriminator, scaler and read out buffer, each responsive to a different multiplexed, digitized address word. The wafers are connected as PIN diodes and are properly biased for such function. Those wafers using materials on which IC cannot be formed are connected to ICs by leads.
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Howell Janice A.
Rauchholz William F.
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