Reading circuit of infrared focal plane array detector
An array detector and infrared focal plane technology, applied in the field of infrared focal plane array detectors, can solve the problem that the non-uniformity correction effect of the readout circuit is not very good, etc.
Active Publication Date: 2014-04-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
[0009] The non-uniformity correction effect of the existing readout circuit that can correct the non-uniformity of the non-TEC uncooled infrared focal plane array detector will be affected by the difference between the same type of components due to the influence of the processing technology, etc. The impact of performance differences, so that the non-uniformity correction effect of this existing readout circuit is not very good
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[0023] In the embodiment of the present invention, the infrared focal plane array detector is an infrared focal plane detector based on a microbolometer, and the detecting unit in the detector is a microbolometer. That is, in this embodiment, the infrared focal plane detector includes a microbolometer array, and the microbolometer array constitutes a detection unit array of the infrared focal plane detector.
[0024] Usually, each microbolometer has a cantilever beam microbridge structure fabricated by micromachining technology. The bridge deck of the microbridge is deposited with a layer of heat-sensitive material with a high temperature coefficient of resistance (TCR). The bridge deck is usually composed of two A bridge leg with good mechanical properties and plated with conductive material is supported, and the contact point between the bridge leg and the substrate is a bridge pier, and the bridge pier is electrically connected to a readout circuit of a microbolometer. Thro...
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The embodiment of the invention discloses a reading circuit of an infrared focal plane array detector, comprising at least two line reading circuits, wherein each line reading circuit comprises a first transistor, a second transistor, a reference resistor and a line output end. The source electrode of the first transistor is connected to a micro-bolometer in a micro-bolometer array, the drain electrode is connected to the drain electrode of the second transistor, and the grid electrode is connected to a VFID. The source electrode of the second transistor is connected to one end of the reference resistor, and the grid electrode is connected to Veb. The reference resistors of the two line reading circuits are connected in parallel to each other. According to the embodiment of the invention, the reference resistors which are connected in parallel are connected with each line reading circuit. Though the performances of the reference resistor in some line are different from that in the other line, the current flowing to each line is the same when each row of the resistors work, so when the temperature is changed, the changes of the current flowing to each line are the same, the correction of the output result of each line is the same, and the uniformity of the output images is improved.
Description
technical field [0001] The invention relates to an infrared focal plane array detector, in particular to a readout circuit of the infrared focal plane array detector. Background technique [0002] According to Planck's radiation theorem, any object with a temperature higher than absolute zero will have molecular thermal motion inside it, thereby producing infrared radiation with different wavelengths. Infrared radiation has an important feature that its intensity and wavelength are directly related to the surface temperature of the object, providing rich information about the object. However, infrared radiation is an invisible electromagnetic wave. When using infrared radiation to obtain information about objects, it is necessary to convert this infrared radiation into a measurable signal. [0003] An infrared focal plane array detector is a device that converts infrared radiation into a measurable signal. The infrared focal plane array detector converts the temperature di...
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IPC IPC(8): G01J5/02G01J5/00
Inventor 吕坚周云杜一颖于彩灯吴张玉
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA