Photodiode array spectrometer

Details Photodiode array spectrometer Photodiode array spectrometer

1989-04-14

1990-09-25

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01J 318, G01J 342

Patent

active

049589288

ABSTRACT:
A photodiode array spectrometer comprises an arry (40) of photosensitive elements for receiving a beam of light. Light impinging on a photodiode causes discharging of the associated capacitors. The capacitors are recharged periodically by a charge amplifier via a video line (30) by closing transfer switches (SW1, . . . , SW 768) associated with the photosensitive elements, repectively. The switches are group together in several segments which are independently addressable such that during a recharge scan only selected groups of photodioldes are recharged. The information which segments are to be sctivated, i.e. which groups of switches are to be closed, is contained in a segment control block (43). An integration control block (46) additionally permits to adjust the time intervals between successive recharge cycles separately for each selected segment. The invention permits to select regions of interest of the photodiode array for a specific application, whereas other regions are ignored for that application, leading to a reduced data rate with high spectral resolution and sensitivity.

REFERENCES:
patent: 4320971 (1982-03-01), Hashimoto et al.

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