Infrared focal plane array detector unit, infrared imaging system and correction method

Abstract

The invention discloses an infrared focal plane array detector unit with a non-uniform correction function, an infrared imaging system and a non-uniform correction method thereof. The infrared focal plane array detector unit comprises a pixel and a blind pixel which are made of the same thermistor material; the pixel responds to incident infrared radiation, while the blind pixel does not respond to the incident infrared radiation; the pixel and the blind pixel are connected in series, and are electrically connected with the inverted input end of an integrated amplifier, and the other end of the blind pixel, which is opposite to the end electrically connected with the pixel, is electrically connected with a compensating blind pixel; like the blind pixel, the compensating pixel does not respond to the incident infrared radiation; and the compensating pixel is used for compensating the blind pixel and indirectly compensating and correcting the nonuniformity of the corresponding pixel. The invention can effectively compensate the nonuniformity of the resistance of the pixel, thus broadening the dynamic range of the effective output of a focal plane array and decreasing noise-equivalent temperature difference.

Description

technical field [0001] The invention relates to the field of infrared detectors, in particular to an infrared focal plane array detector unit, an infrared imaging system and a non-uniformity correction method thereof. Background technique [0002] Infrared detector technology (especially uncooled infrared detector technology) has been developed rapidly in the past ten years. On the one hand, the uncooled focal plane technology has developed from the initial medium and small scale to large-scale 640×480 arrays, and even 1024×1024 uncooled focal plane arrays. On the other hand, the pixel size is gradually reduced from 50 μm, 35 μm, and 25 μm to 17 μm or below. Due to its advantages of small size, low cost, and good reliability, uncooled focal plane detectors are widely used in many key fields such as industry, electric power, medical treatment, and fire protection. With the improvement of the circuit level and manufacturing process, the sensitivity of the uncooled focal plan...

AI Technical Summary

Problems solved by technology

However, since these back-end corrections are processed on the signals that have been amplified and output and sampled by A / D, the correction effect undoubtedly has certain limitations, and it will have a negative impact on the use of detectors and system costs

Also, correction after the detector output cannot resolve the limitation of the dynamic range of the non-uniform focal plane array output

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