X-ray Fluorescence Dead Time Correction via Pulse Height Ranges
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Solution Overview
Problem
Conventional wavelength dispersive X-ray fluorescence spectrometers face inaccuracies in counting rate correction due to changes in the predetermined pulse height range, as the dead time is not accurately accounted for, leading to counting losses.
Innovation Solution
A wavelength dispersive X-ray fluorescence spectrometer with a counting loss correcting unit that stores correlations between pulse height ranges and dead times, allowing for accurate determination and correction of counting rates by referencing a standard spectrometer, and optionally considering energy resolution and pulse height distributions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed dead time value is used for counting loss correction, then the device complexity is reduced, but the measurement precision deteriorates when the pulse height range changes
Solution Approach 1:
The patent applies parameter changes by storing multiple dead time values corresponding to different pulse height ranges and selecting the appropriate dead time value based on the current measurement conditions. This allows the system to adapt the dead time parameter to match the actual operating parameters, thereby maintaining measurement precision without requiring complex real-time calculation systems.
2Adaptability or versatility
If the pulse height range is changed to optimize measurements, then the adaptability is improved, but the reliability of counting rate correction deteriorates due to inaccurate dead time values
Solution Approach 1:
The patent implements dynamics by making the dead time value dynamic rather than fixed. The system automatically selects the appropriate dead time value from stored values based on the current pulse height range settings, ensuring that the correction parameters remain synchronized with the measurement conditions. This dynamic adaptation maintains both adaptability and reliability.
3Measurement precision
If real-time dead time calculation is implemented for each pulse height range, then the measurement precision is improved, but the productivity is reduced due to additional computation time
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing dead time values for various pulse height ranges before actual measurements begin. During measurement, the system simply retrieves the pre-computed value corresponding to the current settings rather than performing real-time calculations, thus maintaining high precision while preserving measurement speed and productivity.
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 precise correction of counting rates even when the pulse height range changes, reducing errors and maintaining accurate measurements across varying conditions.
Implementation Method 1
a detector for receiving the fluorescent X-rays, which have been monochromated by the spectroscopic device, and generating pulses with a pulse height proportional to the energy of the fluorescent X-rays
Implementation Method 2
a spectroscopic device for monochromating fluorescent X-rays emitted from the sample
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
In the wavelength dispersive X-ray fluorescence spectrometer of the present invention, a counting loss correcting unit (11), when correcting a counting rate of pulses determined by a counting unit (10) on the basis of a dead time of a detector (7), stores beforehand a correlation between a predetermined pulse height range, within which pulses are selected by a pulse height analyzer (9), and the dead time and determines the dead time so as to correspond to the predetermined pulse height range during a measurement on the basis of the stored correlation.