X-ray Signal Processor Degradation Detection
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Solution Overview
Problem
Existing X-ray spectrometers using semiconductor detectors face challenges in accurately detecting performance degradation due to X-ray irradiation, electrical circuit failures, and insufficient cooling, as existing methods struggle to distinguish between changes caused by detector abnormalities and variations in X-ray intensity and energy, and cannot evaluate detector performance during continuous operation.
Innovation Solution
An X-ray signal processor with a semiconductor detector, preamplifier, counter, and judgment part that generates a ramp voltage signal, counts X-rays based on voltage changes, and determines performance degradation using first and second voltage change evaluation values, allowing for continuous monitoring and prediction of detector degradation without interrupting measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If leakage current monitoring is performed using an ammeter or current setting apparatus, then detector performance degradation can be detected, but it is impossible to distinguish whether current changes are caused by detector abnormalities or variations in X-ray intensity and energy
Solution Approach 1:
The patent segments the current monitoring into two distinct components: leakage current monitoring (for detector performance) and signal current monitoring (for X-ray detection). By separating these functions and evaluating them independently, the system can accurately identify whether current changes are due to detector degradation or variations in X-ray intensity, resolving the information loss problem.
Solution Approach 2:
The patent introduces an intermediary approach by using the signal current as a reference to evaluate leakage current. By comparing the leakage current against the signal current characteristics, the system can distinguish between detector abnormalities and X-ray variations, preventing false diagnoses.
2Reliability
If the semiconductor detector is replaced before performance degradation, then measurement accuracy is maintained, but unnecessary replacements increase cost and downtime
Solution Approach 1:
The patent implements continuous feedback monitoring of leakage current during detector operation. By constantly evaluating the leakage current and comparing it against threshold values, the system provides real-time information about detector health, enabling replacement only when actually needed rather than on a fixed schedule.
Solution Approach 2:
The patent performs preliminary evaluation of detector performance through leakage current monitoring before actual degradation affects measurements. This allows proactive scheduling of replacements at optimal times, avoiding both premature replacement and operation with degraded detectors.
3Measurement precision
If leakage current is monitored during continuous operation, then detector degradation can be detected in real-time, but the monitoring apparatus increases system complexity
Solution Approach 1:
The patent designs the control unit to perform multiple functions: it controls the high voltage supply to the X-ray source, processes spectral data, and monitors leakage current. By making the control unit multi-functional, the patent avoids adding separate dedicated monitoring hardware, thus minimizing system complexity while achieving real-time detection.
Solution Approach 2:
The patent merges the leakage current monitoring function with the existing control unit that manages X-ray source operation. By combining these functions in a single integrated unit rather than using separate devices, the system achieves real-time monitoring without significantly increasing overall system complexity.
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
Enables accurate detection and prediction of semiconductor detector degradation during X-ray measurement, differentiating between detector issues and circuit problems, and accounting for individual detector variations, allowing for timely replacement and preventing data loss.
Implementation Method 1
a semiconductor detector configured to generate a charge corresponding to energy of detected X-rays
Data Source
AI summary
Provided is an X-ray signal processor and an X-ray spectrometer that are configured to measure X-rays and, at the same time, accurately detect, with a simple method, the degree of performance degradation of a semiconductor detector. The X-ray signal processor includes: a semiconductor detector configured to generate a charge corresponding to energy of detected X-rays; a preamplifier configured to output a ramp voltage signal corresponding to the generated charge; a counter configured to count the X-rays for each voltage change amount due to the charge based on the ramp voltage signal; and a judgment part configured to determine whether the semiconductor detector has been degraded based on a first voltage change evaluation value corresponding to a total sum of products of the voltage change amount and an occurrence frequency thereof, and a second voltage change evaluation value corresponding to an increase amount of the ramp voltage signal.