Series Diode Electro-Thermal Circuit for Ultra-Sensitive Silicon Sensor
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Solution Overview
Problem
Conventional LWIR quantum detectors require cryogenic cooling, making them costly, heavy, and unreliable, while bolometers offer room temperature operation but with limited sensitivity, necessitating the development of ultra-sensitive silicon sensors for improved thermal isolation and sensitivity.
Innovation Solution
The implementation of an electro-thermal feedback circuit with a series temperature-sensing diode configuration in ultra-sensitive silicon sensors (USSS) to achieve active thermal isolation, reducing the effective thermal conductivity and enhancing photo-responsivity and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional bolometers are used for room temperature operation, then operational simplicity and cost are improved, but sensitivity is limited
Solution Approach 1:
The bolometer is divided into three distinct thermal stages: detector stage, intermediate stage, and heat bath stage. This segmentation allows each stage to be optimized independently, with the detector stage achieving ultra-sensitive thermal isolation while the heat bath remains at room temperature, resolving the contradiction between ease of operation and measurement precision
Solution Approach 2:
An intermediate stage is introduced between the detector stage and heat bath stage, serving as a thermal mediator. This intermediate stage with temperature T2 acts as a buffer, allowing the detector stage to maintain ultra-low thermal conductance G1* while the heat bath remains at accessible room temperature, thereby achieving both high sensitivity and operational simplicity
2Measurement precision
If quantum detectors are used for high sensitivity, then measurement precision is improved, but operational complexity and cost increase due to cryogenic cooling requirements
Solution Approach 1:
The cryogenic cooling requirement is extracted and removed from the system. The patent achieves high sensitivity through ultra-low thermal conductance G1* between the detector stage and heat bath, eliminating the need for cryogenic cooling while maintaining quantum-detector-level sensitivity through the three-stage thermal isolation architecture
Solution Approach 2:
The operating temperature parameter is changed from cryogenic to room temperature. By maintaining the detector stage at ultra-low temperature through passive thermal isolation rather than active cooling, the system achieves high sensitivity without the complexity of cryogenic systems, as the heat bath can remain at room temperature
3Measurement precision
If thermal isolation is increased to improve sensitivity, then measurement precision is improved, but thermal conductance increases
Solution Approach 1:
The thermal conductance is made dynamic through temperature-dependent behavior. The patent achieves ultra-low effective thermal conductance G1* that varies with temperature differences, allowing the system to maintain high sensitivity by adapting thermal isolation to operating conditions rather than relying on fixed high thermal conductance structures
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 results in a ten-fold improvement in thermal isolation, increasing photo-responsivity and corresponding sensitivity, thereby overcoming the limitations of conventional bolometers and quantum detectors.
Implementation Method 1
an electro-thermal feedback circuit with a series temperature-sensing diode configuration
Implementation Method 2
electro-thermal feedback circuit with a series temperature-sensing diode configuration
Data Source
AI summary
Electro-thermal feedback is utilized for reducing the effective thermal conductance between the detector stage of a bolometer pixel in a thermal radiation sensor assembly and the environment through its mechanical support structure and electrical interconnects, thereby coming closer to achieving thermal conductance limited primarily through photon radiation. Minimization of the effective thermal conductance associated with the mechanical support structure and electrical interconnects is achieved by electro-thermal feedback that adjusts the temperature of an intermediate stage and the mechanical support structure and electrical interconnects, connecting it to the detector stage, to equal the temperature of the bolometer pixel's detector stage (i.e., by active thermal isolation). Increased temperature sensitivity is preferably achieved through temperature sensing with reverse biased Schottky diodes connected in series.