Electronic chopping
First Claim
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1. A radiation detector, comprising:
- (a) a first photoconductor biased by a first voltage source, said first photoconductor positioned to receive input radiation; and
(b) a second photoconductor biased by a second voltage source, said second photoconductor positioned to receive input radiation, said first and second photocondutors connected in parallel to a signal detector;
(c) wherein said first voltage source provides a constant voltage and said second voltage source provides a voltage which periodically alternates polarity and thereby emulates chopping of radiation to said photoconductors by alternatingly adding and canceling the currents from said first and second photoconductors.
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Abstract
A sensor with radiation detectors with two or more photoconductor elements and bias polarity switching of one element to emulate mechanical chopping of input radiation. This electronic chopping permits higher chopping frequencies than mechanical chopping for bolometers because the scene settling time does not limit electronic chopping. The detectors may be within a single vacuum integrated circuit package with separate narrow passband filters for chemical spectral analysis.
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Citations
4 Claims
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1. A radiation detector, comprising:
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(a) a first photoconductor biased by a first voltage source, said first photoconductor positioned to receive input radiation; and (b) a second photoconductor biased by a second voltage source, said second photoconductor positioned to receive input radiation, said first and second photocondutors connected in parallel to a signal detector; (c) wherein said first voltage source provides a constant voltage and said second voltage source provides a voltage which periodically alternates polarity and thereby emulates chopping of radiation to said photoconductors by alternatingly adding and canceling the currents from said first and second photoconductors. - View Dependent Claims (2, 3)
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4. A radiation detector array, comprising:
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(a) an array of pixels, each of said pixels including; a first photoconductor biased by a first voltage source, said first photoconductor positioned to receive input radiation; and a second photoconductor biased by a second voltage source, said second photoconductor positioned to receive input radiation, said first and second photocondutors connected in parallel to a signal detector; wherein said first voltage source provides a constant voltage and said second voltage source provides a voltage which periodically alternates polarity and thereby emulates chopping of radiation to said photoconductors by alternatingly adding and canceling the currents from said first and second photoconductors; and (b) circuitry coupling said pixels.
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Specification