TEC Cooling Control for Single-Photon Detectors
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Solution Overview
Problem
Existing single-photon detectors lack voltage protection for thermoelectric coolers (TECs) and fail to maintain performance when ambient temperature exceeds the maximum cooling capacity or TEC performance degrades, leading to reduced service life and unstable operation.
Innovation Solution
Implement a cooling control method and system that limits the maximum operating voltage of TECs, monitors operating voltage and temperature in real-time, and adjusts target temperatures and APD bias voltages to maintain stable operation under varying ambient conditions and TEC performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the TEC operates at high voltage to maintain target temperature under high ambient temperature or degraded performance, then the cooling capability is improved, but the service life of the TEC device deteriorates
Solution Approach 1:
The system implements feedback control by monitoring the operating voltage of the TEC in real-time and comparing it with a preset threshold value. When the operating voltage exceeds the threshold, indicating high ambient temperature or performance degradation, the system automatically adjusts the target temperature of the TEC to a lower value, thereby reducing the operating voltage and protecting the TEC from excessive stress. This closed-loop feedback mechanism ensures the TEC operates within safe voltage limits while maintaining stable detector performance.
2Measurement precision
If the TEC operates at maximum capacity to reach target temperature, then the temperature control precision is improved, but the system adaptability to extreme conditions deteriorates
Solution Approach 1:
The system dynamically adjusts the target temperature of the TEC based on real-time monitoring of its operating voltage. When the operating voltage exceeds a preset threshold, the target temperature is automatically reduced, and when it falls below the threshold, the target temperature is restored. This dynamic adjustment mechanism allows the system to adapt to varying ambient conditions and TEC performance states, maintaining both temperature control precision and system adaptability to extreme conditions.
3Device complexity
If no voltage protection is provided for the TEC, then the device complexity is reduced, but the reliability of the system deteriorates
Solution Approach 1:
The system incorporates a feedback control mechanism that monitors the operating voltage of the TEC and compares it with a preset threshold. When the voltage exceeds the threshold, the system automatically adjusts the target temperature to reduce the voltage, and when it falls below, the target temperature is restored. This feedback-based protection approach ensures system reliability without requiring complex protection circuits, as it uses the existing temperature control loop to achieve voltage limitation.
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
The solution prolongs the service life of TECs and single-photon detectors by maintaining stable performance parameters such as detection efficiency and reducing afterpulse probability, even under extreme conditions.
Implementation Method 1
a commonly used cooling control process of a TEC (thermoelectric cooler) is as follows
Data Source
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AI summary
Disclosed in the present invention is a single-photon detector cooling control method and system adaptive to temperature and TEC performance changes. The method limits the maximum working voltage of a TEC, monitors in real time a working voltage and a cooling temperature of the TEC, and automatically adjusts a target temperature and an APD working bias voltage according to a monitoring result, so as to effectively guarantee that the single-photon detector can still work stably when the working environment temperature is too high or the TEC performance is degraded. Meanwhile, when the environment temperature recovers to a normal temperature range, the present invention allows a cooling target temperature of the TEC to be recovered to an initial cooling target temperature, and synchronously adjusts the APD working bias voltage, so that the performance indexes of the single-photon detector, such as the detection efficiency, the dark count rate, the afterpulse probability, are synchronously recovered to a normal state, thus effectively prolonging the service life of TECs and single-photon detector devices, and improving the environmental adaptability of single-photon detectors.