Refrigerating system for CCD (Charge Coupled Device) detector

Abstract

The invention provides a refrigerating system for a CCD (Charge Coupled Device) detector, which comprises a cold plate, a semiconductor refrigerating sheet, a temperature sensor, a temperature controller and a conversion unit, wherein the cold plate is provided with a first face, a second face and a side wall; the cold face of the semiconductor refrigerating sheet is contacted with the first face of the cold plate, and the cold face cools the CCD detector through the second face of the cold plate; the temperature sensor is used for detecting the current temperature of the cold plate and outputting a temperature indicating signal; the temperature controller reads the current temperature of the cold plate according to the temperature indicating signal and compares the current temperature with the first predetermined temperature to obtain a control signal; and the conversion unit is used for adjusting the current temperature of the cold face to the first predetermined temperature selectively by supplying power to the semiconductor refrigerating sheet through a power supply according to the control signal. According to the refrigerating system, the temperature of the CCD detector can be freely controlled, so that influence of high temperature on the CCD detector is reduced. In addition, the temperature of the CCD detector is ensured to change stably through the cold plate, so that the service life of the CCD detector is prolonged.

Description

technical field [0001] The invention relates to the technical field of CCD detectors, in particular to a cooling system for CCD detectors. Background technique [0002] CCD (Charge-coupled Device) detector technology is one of the mainstream technologies used in DR (Digital Radiography, direct digital X-ray photography system) products in the world, with stable and reliable performance. [0003] However, due to the technical characteristics of the CCD chip itself, it is determined that its dark current noise and readout noise are large under normal temperature conditions, which will affect the final image imaging results, especially in the X-ray environment, where the illumination itself is very low and the influence of noise The signal-to-noise ratio of the image is worse than that of the visible light environment. Therefore, it is necessary to use a cooling device to cool the CCD detector. [0004] When the semiconductor refrigeration sheet used in the prior art is used ...

AI Technical Summary

Problems solved by technology

[0004] When the semiconductor refrigeration sheet used in the prior art is used to cool the CCD detector, due to users in different regions, the indoor temperature may vary greatly, so the temperature difference of the cold surface of the semiconductor refrigeration sheet used in different regions is relatively large. In turn, the signal-to-noise ratio of the detection photo of the CCD detector may be very low, affecting the image quality

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