Radiation Analysis Sensitivity Correction via Temporal Data Association
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Solution Overview
Problem
Existing radiation analyzing apparatuses using superconductive transition edge sensors face challenges in maintaining accurate sensitivity correction due to fluctuations in detection data, leading to deteriorated correction accuracy.
Innovation Solution
The apparatus incorporates a sensitivity correction unit that arbitrarily sets temporal correspondence between physical quantities correlated with detection sensitivity and the detection signal, using time information to associate data accurately, thereby stabilizing sensitivity correction and maintaining desired accuracy and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensitivity correction is performed using detection data from the superconductive transition edge sensor, then sensitivity correction can be applied to maintain detection accuracy, but correction accuracy deteriorates due to fluctuations in the detection data
Solution Approach 1:
The patent applies preliminary action by measuring and storing the relationship between heater output and detection sensitivity in advance, before actual sensitivity correction is needed. This pre-established correlation data allows the system to perform accurate sensitivity correction without relying on fluctuating real-time detection data, thereby maintaining stable correction accuracy.
Solution Approach 2:
The patent introduces heater output as an intermediary parameter that mediates between the detection signal and sensitivity correction. Instead of directly using fluctuating detection data for correction, the system uses the stable heater output measurement as an intermediate reference to determine sensitivity changes, thereby stabilizing the correction process.
2Measurement precision
If the base line current flowing to the TES is kept constant using a SQUID amplifier, then high energy resolution can be achieved, but the system becomes sensitive to current fluctuations that deteriorate correction accuracy
Solution Approach 1:
The patent implements feedback by continuously monitoring the base line current flowing to the TES and using this information to adjust the sensitivity correction. The system measures the actual current and uses this feedback to compensate for fluctuations, thereby maintaining both high energy resolution and stable correction accuracy.
3Productivity
If detection data is used for sensitivity correction at any timing, then correction can be performed continuously, but errors in detection data cause deterioration in correction accuracy
Solution Approach 1:
The patent applies preliminary action by pre-measuring the correlation between heater output and detection sensitivity under various conditions. This allows the system to select and apply the most appropriate pre-measured correction data rather than continuously using potentially erroneous real-time detection data, thereby maintaining both high correction frequency and accuracy.
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 suppresses deterioration in correction accuracy caused by errors in detection data, ensuring precise sensitivity correction and improved energy resolution in radiation analysis.
Implementation Method 1
a detector including a superconductive transition edge sensor (hereinafter, referred to as a TES) is a high-sensitivity calorimeter using a sharp resistance change (for example, a resistance change is 0.1 Ω when a temperature change is several mK) when a metal thin film transitions from a superconductive state to a normal conductive state
Implementation Method 2
The TES analyzes a sample by detecting a temperature change occurring within the TES when fluorescent X-rays or characteristic X-rays generated from the sample by radiation irradiation with primary X-rays, primary electron beams, or the like are incident thereon
Implementation Method 3
a superconducting quantum interference device (hereinafter, referred to as a SQUID) amplifier is used to read out an extremely small current change in the TES
Implementation Method 4
there is known a radiation analyzing apparatus that corrects a wave height value of a signal pulse of a TES on the basis of correlation between an output of a heater embedded into a pedestal having the TES installed thereon
Data Source
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AI summary
A superconductive transition edge sensor detects radiation. A wave height analyzer generates an energy spectrum of radiation using a detection signal which is output from the superconductive transition edge sensor. A temperature control section and a base line monitor mechanism acquire a physical quantity of data having correlation with detection sensitivity of the superconductive transition edge sensor. A sensitivity correction arithmetic operation unit associates the physical quantity of a plurality of pieces of the acquired data at a plurality of different timings over a predetermined period of time with the detection signal at a certain timing and corrects the detection signal at the certain timing in accordance with the detection sensitivity of the superconductive transition edge sensor by using information regarding the correlation between the physical quantity of the plurality of pieces of data and the detection sensitivity of the superconductive transition edge sensor.