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Uncooled infrared detector and automatic gain correction circuit thereof

An uncooled infrared, automatic gain technology, applied in the field of infrared imaging, can solve the problems of increasing the difficulty of use in application scenarios such as temperature measurement, lack of non-uniformity correction, and large differences in response rates.

Pending Publication Date: 2022-04-15
北方广微科技有限公司
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Problems solved by technology

The advantages of this architecture are simple structure and low power consumption, while the disadvantages are the lack of non-uniformity correction and the responsivity is inversely proportional to the pixel resistance
The latter causes a significant increase in the response rate at high temperatures, but a significant decrease in the response rate at low temperatures, making the noise equivalent temperature difference (NETD) unacceptable at low temperatures. Difficulty of using

Method used

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  • Uncooled infrared detector and automatic gain correction circuit thereof
  • Uncooled infrared detector and automatic gain correction circuit thereof
  • Uncooled infrared detector and automatic gain correction circuit thereof

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Embodiment Construction

[0021] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in this specification. It should be understood, however, that in developing any such practical embodiment, many implementation-specific decisions must be made in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and those Restrictions may vary from implementation to implementation. Moreover, it should also be understood that development work, while potentially complex and time-consuming, would at least be a routine undertaking for those skilled in the art having the benefit of this disclosure. Here, it should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only the device structure and / or processing steps closely related to the solution ...

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Abstract

The invention provides an uncooled infrared detector and an automatic gain correction circuit thereof. The automatic gain correction circuit comprises a responsivity stabilizing unit which is connected to a sensitive pixel of the uncooled infrared detector and is used for compensating deviation caused by responsivity change of a pixel resistor at different temperatures; and the reference voltage correction unit is connected to the response rate stabilization unit and is used for correcting the reference voltage to compensate for deviation caused by non-uniformity of the resistance of the sensitive pixel on the chip. Through the automatic gain correction circuit provided by the invention, the influence of non-uniformity of pixel resistance is suppressed; meanwhile, the response rate is no longer inversely proportional to the pixel resistance value, the stability of the response rate and the noise equivalent temperature difference at high and low temperatures is ensured, and the use of a user is facilitated.

Description

technical field [0001] The invention relates to infrared imaging technology, in particular to an uncooled infrared detector and its automatic gain correction circuit in the infrared imaging technology. Background technique [0002] At present, uncooled infrared imaging technology has important applications in military, industrial and agricultural, medical, astronomical and other fields. As the core of the uncooled infrared imaging technology, the infrared focal plane array includes two parts: an infrared detector array and a readout circuit. Among them, the microbolometer focal plane array (FPA) has high sensitivity and is the most widely used uncooled infrared focal plane array. Its working principle is that the temperature of the heat-sensitive material changes after absorbing the incident infrared radiation, thereby It causes the change of its own resistance value, and detects the magnitude of the infrared radiation signal by measuring the change of its resistance value....

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Application Information

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IPC IPC(8): G01J5/24
Inventor 谭果方辉卢蕊郭健海
Owner 北方广微科技有限公司
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