Circuit arrangement for reading out sensors sensitive to light o

Details Circuit arrangement for reading out sensors sensitive to light o Circuit arrangement for reading out sensors sensitive to light o

1990-11-30

1992-10-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

35821331, H01J 4014

Patent

active

051534231

ABSTRACT:
A photodiode radiation sensor sensitive to luminous or x-ray radiation, has an inherent capacitance which is charged by the radiation. The charge is read out by a switching diode. The diode is placed in its conductive state by an auxiliary voltage and is switched off after the read-out process. The quantity of charge flowing during the read-out process is measured and used to determine the quantity of incident radiation. To measure relatively small quantities of charge, a voltage is coupled in when the auxiliary voltage is switched on to place the switching diode in a more strongly conducting state so that during the read-out process a larger quantity of charge flows away.

REFERENCES:
patent: 4797560 (1989-01-01), Berger et al.
patent: 4800557 (1989-01-01), Weber
patent: 4945419 (1990-07-01), Arques
patent: 4948966 (1990-08-01), Arques et al.

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