Infrared imaging method based on digital domain TDI (Time Delay Integration)

Abstract

The invention discloses an infrared imaging method based on digital domain TDI (Time Delay Integration), belongs to the technical field of infrared imaging and aims at solving the problem that according to a general infrared imaging method, flexible and continuous integral series selection and image collection of a large target range cannot be realized. A target radiation signal is gathered on an area array infrared detector through an optical lens. The area array infrared detector converts the target radiation signal into an analog voltage signal. Impedance matching and scale amplification are carried out on the signal through an operational amplifier, and an analog signal matching with an input end of an A / D converter is output. Digital quantification is carried out on the signal through the A / D converter, and then the signal is output to an FPGA circuit. Quantified image data is stored in the FPGA circuit by taking a frame as a unit. Caching and TDI superimposition algorithm are carried out on the multiple frames of image data. The processed image data is output finally. According to the method, the exposure time is effectively increased; the system sensitivity is improved; and a weak radiation target can be detected and sensed.

Description

technical field [0001] The invention belongs to the technical field of infrared imaging, and relates to an infrared imaging method using a digital domain to realize the function of time delay integration (TimeDelay Integration). Background technique [0002] The core of the infrared imaging system is the infrared detector, which determines the main performance indicators of the imaging system, so the design of the infrared imaging system is carried out around the infrared detector. Currently commonly used infrared detectors can be divided into TDI (Time Delay Integration) infrared detectors and area array infrared detectors according to their working methods. Therefore, conventional infrared imaging methods include TDI imaging methods and area array imaging methods. The former uses the pixel structure of the sensor to realize the transfer and exposure accumulation of each row of pixels, thereby increasing the exposure time to the target, obtaining sufficient signal energy, a...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the conventional infrared imaging method cannot realize flexible and continuous integral series selection and image acquisition of a large target range, the present invention proposes an infrared imaging method based on digital domain TDI, using the existing area array infrared detector, Realized the function of time-delay integration, effectively increased the exposure time, improved the sensitivity of the system, has the imaging capability of a large target range, can flexibly and continuously select the integration series, and can detect weak radiation targets

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