Low-level light detector and low-level light imaging apparatus

Details Low-level light detector and low-level light imaging apparatus Low-level light detector and low-level light imaging apparatus

2006-11-14

2006-11-14

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C327S514000

Reexamination Certificate

active

07135669

ABSTRACT:
A low-level light detector includes an avalanche photodiode (APD) to which is applied a bias voltage adjusted to produce a multiplication factor of not more than 30, and a capacitor for accumulating carriers produced by light in the APD and multiplied using the APD characteristics, the capacitor being connected to the avalanche photodiode. The detector detects the intensity of light impinging on the avalanche photodiode by periodically reading the capacitor voltage and obtaining time-based differences in the voltage, or by resetting the capacitor voltage to a predetermined voltage each time the capacitor voltage is read.

REFERENCES:
patent: 2002/0043614 (2002-04-01), Miyamoto et al.

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