High-speed logarithmic photo-detector

Details High-speed logarithmic photo-detector High-speed logarithmic photo-detector

1998-01-23

1999-12-14

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214L, H01J 4330

Patent

active

060021225

ABSTRACT:
According to the present invention, a photomultiplier tube is used with a high-speed feedback mechanism to continuously modulate the gain of the tube in response to the size of the input signal. The gain of the tube and the anode current are independently converted to ideal logarithms. These signals are then subtracted from one another to reconstruct a true logarithmic representation of the optical signal. This log-light-level signal has a higher dynamic range and faster temporal response than has previously been achieved by other methods.

REFERENCES:
patent: 3586443 (1971-06-01), Hooper
patent: 3653763 (1972-04-01), Davies
patent: 3715586 (1973-02-01), Thomas et al.
patent: 3733491 (1973-05-01), Holland, Jr.

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