System and method for eliminating background level drift of infrared remote sensor

A technology of remote sensors and infrared detectors, applied in the field of aerospace remote sensing, can solve problems such as background level drift with temperature, and achieve the effect of suppressing the influence

Active Publication Date: 2016-06-01
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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Problems solved by technology

From the perspective of the system, the use of the optical path shielding device and the circuit cooperates to solve the problem of the background level of the infrared detector drifting with temperature and improve the quality of the output image of the infrared detector

Method used

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  • System and method for eliminating background level drift of infrared remote sensor
  • System and method for eliminating background level drift of infrared remote sensor
  • System and method for eliminating background level drift of infrared remote sensor

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Embodiment Construction

[0031] The present invention is described in detail below in conjunction with accompanying drawing, as figure 1 As shown, an infrared remote sensor background level drift elimination system includes an optical system, a mechanism control circuit, an optical path blocking device, a timing generation and signal processing circuit, and an infrared detector;

[0032] The optical system collects the target optical signal, uses the R-C optical system to pass the target optical signal through the optical system, and outputs the converged optical signal to the optical path blocking device;

[0033] The timing generation and signal processing circuit uses FPGA to provide the timing signal required for the infrared detector, uses the reference source to divide the voltage to realize the bias level output, and uses the output level of the linear voltage regulator block to supply power to the infrared detector. At the same time, the timing generation and signal The processing circuit send...

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Abstract

The invention discloses an ambient level drift cancellation system and a method of the ambient level drift cancellation system for an infrared remote sensor, belonging to the field of space remote sensing. The method is characterized by comprising the following steps that an infrared detector receives a convergence light signal which is periodically shielded by a light path shielding device, converts the convergence light signal into an electric signal, and transmits the electric signal to a time sequence generation and signal processing circuit; and the time sequence generation and signal processing circuit clamps an isolated direct current signal output from the infrared detector at the moment that the electric signal is shielded by a baffle in the light path shielding device to be zero, thereby eliminating the ambient level output from the infrared detector. Based on the system and with the combination of the light path shielding device and the circuit, the method solves the problems that dark current of an infrared focal plane detector changes along with working temperature and that the ambient level of a remote sensor output image changes because of degeneration of the detector, and has positive significance in habiting dark background of images, retaining the dynamic range of a camera and improving the image quality.

Description

technical field [0001] The invention relates to an infrared remote sensor background level drift elimination system and a method thereof, which belong to the technical field of spaceflight remote sensing. Background technique [0002] With the rapid development of aerospace optical remote sensor technology, the requirements for the imaging quality of optical remote sensors are getting higher and higher. The temperature rises and changes. In theory, its increasing trend is a monotonous increase. In fact, the output of the infrared detector without light is a non-monotonic curve. Due to the infrared detector cooling components, such as: radiation cooler or refrigerator, its performance will decay over time, and its cooling temperature cannot be kept ideally constant, so that the dark background of the output image of the space remote sensing camera changes with the operating temperature of the infrared detector And changes, especially due to the non-monotonicity between the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C11/02H04N5/33
CPCG01C11/02G01J5/10H04N5/33
Inventor 王杰马越周峰
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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