Thermopile Radiation Sensor for Direct High-Dose Readout
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Solution Overview
Problem
Existing radiation sensors face challenges in accurately measuring radiation dose with low uncertainty, as they often require power and complex calibration, and are prone to uncertainties due to ionizing particle interactions.
Innovation Solution
The development of a thermopile radiation sensor that uses a series of thermocouple junctions with different thermal responses to directly measure radiation dose without the need for power, leveraging the Seebeck effect for accurate dose measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional radiation sensors (scintillators, semiconductors, gas detectors) are used to measure radiation dose, then sensitivity and detection capability are improved, but measurement uncertainty increases to 5% or greater due to reliance on inferred measurements and unknown interaction cross sections
Solution Approach 1:
The patent replaces indirect inference methods (optical, electrical) with direct thermal measurement. Instead of using scintillators that convert radiation to light or semiconductors that collect charge, the invention uses thermocouples to directly measure the temperature rise caused by radiation energy deposition, providing a direct measurement of ergs/gram without relying on interaction cross sections
Solution Approach 2:
The radiation sensor uses the radiation energy itself to create the measurement signal. The ionizing radiation directly heats the thermocouple junctions, and this self-generated thermal signal is measured to determine dose, eliminating the need for external power sources or complex calibration
2Measurement precision
If thermal devices (thermistors, resistive temperature sensors) are used to measure temperature rise from irradiation, then direct dose measurement capability is improved, but device complexity and power requirements increase due to imposed bias and continuous power needs
Solution Approach 1:
The patent replaces complex powered thermal measurement systems with passive thermocouple-based measurement. Instead of using thermistors or resistive sensors that require continuous power and complex electronics, the invention uses thermocouples that generate their own signal from the temperature difference created by radiation heating, eliminating the need for external power and complex calibration
Solution Approach 2:
The patent extracts only the essential thermal measurement function from complex powered systems. By using thermocouples that directly convert the radiation-induced temperature rise into a measurable voltage signal, the invention removes unnecessary power requirements, bias circuits, and complex calibration procedures
3Speed
If powered radiation sensors are used to provide continuous monitoring, then real-time detection capability is improved, but power consumption increases and calibration stability deteriorates over time
Solution Approach 1:
The radiation sensor is completely self-powered by the radiation energy it detects. The ionizing radiation directly heats the thermocouple junctions, generating a voltage signal that requires no external power source. This self-service mechanism eliminates continuous power consumption while maintaining real-time detection capability
Solution Approach 2:
The patent changes the operational state of the sensor from active (powered) to passive (self-powered). By utilizing the thermal effect of radiation directly through thermocouples, the system transitions from requiring external power and active electronics to using the radiation energy itself to generate the measurement signal
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 solution provides high dynamic range, fast time response, and accurate direct readout of radiation dose, achieving precision of 1% or better, while being radiation-hard and capable of operating in various environments.
Implementation Method 1
leveraging the Seebeck effect for accurate dose measurement
Data Source
AI summary
The present invention provides apparatuses comprising a plurality of junctions providing a Seebeck effect, configured as alternating hot and cold junctions. The apparatus can be configured such that the cold junctions exhibit a different thermal behavior than the hot junctions in response to incident radiation. The junctions can be connected in series, such that the sum of the Seebeck effect from the plurality of junctions provides a sensitive, inherently calibrated indication of heating of the apparatus responsive to incident radiation, and therefore of the radiation itself.