Electrical detector arrangements

Details Electrical detector arrangements Electrical detector arrangements

1987-08-03

1989-01-03

LaRoche, Eugene R.

Radiant energy

Infrared-to-visible imaging

Including detector array

250214DC, H01L 2500

Patent

active

047959045

ABSTRACT:
An electrical detector arrangement is provided having a chopper device for alternately exposing to and obscuring from a detector array a thermal radiation pattern to be detected and imaged. The outputs from the detectors of the array are multiplexed by a multiplexer and then digitized by means of a low cost analogue-to-digital converter. The digital output from the coverter during obscuration of the detector array from the thermal radiation pattern is stored in memory means and this stored data is converted to an analogue signal by a digital-to-analogue converter subtracted from the output of the multiplexer during exposure to and obscuration from the thermal pattern of the detector array by means of a differential amplifier. The output from the differential amplifier which substantially reduces the offset level of the multiplexed detector outputs is then fed to a further low cost analogue-to-digital converter.

REFERENCES:
patent: 4686566 (1987-08-01), Bucher
patent: 4694334 (1987-09-01), Bucher et al.
patent: 4724482 (1988-02-01), Duvent

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