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An Uncooled Infrared Focal Plane Array Readout Circuit Based on Exponential Model

An uncooled infrared and focal plane array technology, applied in the field of infrared focal plane, to eliminate the influence of substrate temperature and reduce circuit noise

Active Publication Date: 2020-07-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the resistance model that changes linearly with temperature can only conform to the relationship between the equivalent resistance of the microbolometer and the temperature change within a certain temperature range; beyond a certain temperature range, it will bring large errors

Method used

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  • An Uncooled Infrared Focal Plane Array Readout Circuit Based on Exponential Model
  • An Uncooled Infrared Focal Plane Array Readout Circuit Based on Exponential Model
  • An Uncooled Infrared Focal Plane Array Readout Circuit Based on Exponential Model

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Embodiment Construction

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0045] The object of the present invention is to provide an uncooled infrared focal plane array readout circuit based on an exponential model, which has no substrate temperature influence, low circuit noise, accurate reference signal and strong adaptability.

[0046] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the acc...

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Abstract

The invention discloses an uncooled infrared focal plane array readout circuit based on an exponential model, comprising: a first microbolometer unit for detecting infrared light signals of objects to be detected to obtain detection radiation signals; The thermal meter unit obtains a reference signal according to its own resistance; the conversion unit is respectively connected with the first microbolometer unit and the second microbolometer unit, and generates a detection signal and a reference signal according to the detection radiation signal; The subtraction unit is connected with the conversion unit, and the detection signal and the reference signal are subtracted to obtain a difference signal; the integration unit is connected with the subtraction unit, and the difference signal is integrated to obtain an electrical signal representing the infrared light signal to be detected. The invention performs bias conversion and calculation on the infrared light signal to be detected to obtain the infrared photoelectric signal irrelevant to the temperature, reduces the noise of the circuit, and eliminates the influence of the temperature on the final result.

Description

technical field [0001] The invention relates to the technical field of infrared focal planes, in particular to an uncooled infrared focal plane array readout circuit based on an exponential model. Background technique [0002] Uncooled infrared focal plane array detectors are widely used in military, industry, medicine, scientific research and other fields, the most representative of which is the microbolometer; the microbolometer is a photo-thermal-electric type The infrared detector, the detector array receives infrared radiation to cause the temperature change of the microbolometer, which leads to the change of its equivalent resistance; the infrared microbolometer readout circuit is to read the equivalent resistance of the microbolometer The change value of the corresponding target infrared radiation information is obtained by a dedicated circuit. [0003] Objects at different temperatures will emit infrared rays of different wavelengths, causing the pixels on the detec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J5/24G01J5/03
CPCG01J5/24H04N5/33G01J5/22G01J1/44G01J5/28H01L31/024
Inventor 阙隆成闵道刚杨凯张逸吕坚周云蒋亚东
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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