Microbolometer focal plane array with temperature compensated bias
First Claim
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1. A microbolometer imaging apparatus, comprising:
- an array of selectable substrate-isolated microbolometer detectors for being exposed to a target scene of interest, each detector, Dn, having corresponding resistance value, Rpixeln;
a detector selection controller coupled to the array of detectors for selectively coupling an electrical bias source to each detector; and
a readout circuit for establishing a corresponding output signal, Soutn, representative of the resistance value, Rpixeln associated with the nth detector, Dn, at a given instant, the readout circuit comprising;
a feedback bias control circuit comprising an integrating amplifier circuit that modulates the electrical bias source as a function of the microbolometer detector output signal, Sout.
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Abstract
A microbolometer imaging apparatus having an array of selectable substrate-isolated microbolometer detectors, a detector selection controller, and a readout circuit. The detectors may be exposed to a scene of interest, and each detector has a corresponding resistor value. The detector selection controller may selectively couple an electrical bias source to each detector. The readout circuit may establish an output signal representative of the resistance value of each detector. The readout circuit includes a feedback bias control circuit modulates the electrical bias source as a function of the output signal.
30 Citations
24 Claims
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1. A microbolometer imaging apparatus, comprising:
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an array of selectable substrate-isolated microbolometer detectors for being exposed to a target scene of interest, each detector, Dn, having corresponding resistance value, Rpixeln; a detector selection controller coupled to the array of detectors for selectively coupling an electrical bias source to each detector; and a readout circuit for establishing a corresponding output signal, Soutn, representative of the resistance value, Rpixeln associated with the nth detector, Dn, at a given instant, the readout circuit comprising; a feedback bias control circuit comprising an integrating amplifier circuit that modulates the electrical bias source as a function of the microbolometer detector output signal, Sout. - View Dependent Claims (2, 3)
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4. A microbolometer imaging apparatus, comprising:
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an array of selectable substrate-isolated microbolometer detectors for being exposed to a target scene of interest, each detector, Dn, having corresponding resistance value, Rpixeln; a detector selection controller coupled to the array of detectors for selectively coupling an electrical bias source to each detector; and a readout circuit for establishing a corresponding output signal, Soutn, representative of the resistance value, Rpixeln associated with the nth detector, Dn, at a given instant, the readout circuit comprising; a feedback bias control circuit that modulates the electrical bias source as a function of the microbolometer detector output signal, Sout; and a selection switch circuit for selectively coupling the microbolometer detector output signal, Sout, with the feedback bias control circuit. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A microbolometer imaging apparatus, comprising:
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an array of selectable substrate-isolated microbolometer detectors for being exposed to a target scene of interest, each detector, Dn, having corresponding resistance value, Rdetectorn; at least one temperature sensor associated in thermal proximity to selected ones of rows or columns of the array, each temperature sensor, Sm, having a corresponding electrical parameter value, Rsensorm; a detector selection controller coupled to the array of detectors and the at least one temperature sensor for selectively coupling an electrical detector-bias source to each detector and an electrical sensor-bias source to each temperature sensor; and a readout circuit for establishing an output signal, Sout, the output signal having (1) a detector output signal component, Soutn, representative of the resistance value, Rdetectorn, associated with the nth detector, Dn, at a given instant; and (2) a sensor output signal component, Soutm, representative of the electrical parameter value, Rsensorm, associated with the mth temperature sensor, Sm, at a given instant; the readout circuit comprising; a feedback sensor-bias control circuit that modulates the electrical sensor-bias source as a function of the sensor output signal component of the output signal Sout; and a feedback detector-bias control circuit that modulates the electrical detector-bias source as a function of the sensor-bias source and a detector bias offset. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification