Peltier Element Thermal Decoupling in X-Ray Detectors
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Solution Overview
Problem
Existing radiation detectors face challenges in achieving accurate and stable operation, particularly in maintaining optimal temperature conditions for conversion elements without inadvertently heating the readout circuits, which affects signal quality and stability.
Innovation Solution
A radiation detector design that incorporates a Peltier element with a heat source oriented towards the conversion element and a heat sink oriented towards the readout circuit, allowing for controlled heating of the conversion element while cooling the readout circuit, thereby maintaining different operational temperatures to enhance signal accuracy and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heating elements are integrated into the ASIC to stabilize temperature, then the total electrical power is kept constant, but the readout circuit is inadvertently heated which affects signal quality
Solution Approach 1:
The heating function is segmented from the readout circuit (ASIC) and placed as a separate heating device. This allows independent temperature control of the conversion element without thermally affecting the readout circuit, resolving the contradiction between temperature stability and readout circuit heating.
Solution Approach 2:
A thermal isolation structure acts as an intermediary between the heating device and the readout circuit. This mediator allows the conversion element to be heated while preventing heat transfer to the readout circuit, eliminating the harmful thermal effect on signal quality.
2Measurement precision
If the conversion element is heated to reduce polarization effects, then detection accuracy improves, but the readout circuit temperature increases reducing signal stability
Solution Approach 1:
The system is segmented into thermally independent zones: the conversion element can be heated to optimize detection accuracy while the readout circuit maintains a separate, stable temperature for signal stability, eliminating the trade-off between these two requirements.
Solution Approach 2:
Different thermal conditions are applied locally to different components: the conversion element receives heated treatment to reduce polarization and improve detection accuracy, while the readout circuit maintains a separate thermal environment to preserve signal stability.
3Use of energy by moving object
If heating device is integrated close to the conversion element, then heating efficiency increases, but thermal coupling with the readout circuit increases
Solution Approach 1:
A thermal isolation structure serves as an intermediary between the heating device and the readout circuit. This allows the heating device to be positioned close to the conversion element for efficient heating while the thermal mediator prevents heat transfer to the readout circuit.
Solution Approach 2:
A thin thermal isolation layer (such as an insulating film or interface layer) is introduced between the heating device and the readout circuit. This thin barrier provides effective thermal isolation while maintaining compact device geometry and high heating efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively decouples the heating of the conversion element from the readout circuit, allowing for optimal temperature control, reducing polarization effects and dark current, and improving the overall accuracy and stability of radiation detection.
Implementation Method 1
The heating device comprises a Peltier element, wherein the heat source of said Peltier element is oriented towards the conversion element and its heat sink is oriented towards the readout circuit
Data Source
AI summary
The invention relates to a radiation detector (100′) and a method for detecting radiation, particularly for detecting X-rays (X) in a CT imaging apparatus (1000′). According to a preferred embodiment, the radiation detector (100′) comprises a conversion element (110) for converting incident radiation (X) into electrical signals which are read out and processed by a readout circuit (120). A heating device comprising the heat source (135′) of a Peltier element is provided with which the conversion element (110) can controllably be heated in order to reduce negative effects, e.g. of polarization, on image accuracy, wherein the heat sink (137′) of the Peltier element is oriented towards the readout circuit.