XRF Analyzer Volume Adjustment for Air Density Calibration
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Solution Overview
Problem
XRF analyzer instruments face challenges in maintaining calibration due to changes in measurement chamber characteristics, particularly air density, which can lead to unreliable analysis results and require laborious recalibration procedures.
Innovation Solution
A hermetically sealed measurement chamber with a volume adjustment assembly that maintains reference air density, allowing for automatic adjustment to restore calibration validity after changes in air density, thereby ensuring consistent analysis without the need for repeated empirical calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the measurement chamber is provided as vacuum or filled with helium to reduce X-ray absorption, then the X-ray transmission is improved, but the device complexity and cost increase due to vacuum systems or special gas handling
Solution Approach 1:
The patent changes the physical parameter of air density within the measurement chamber by providing adjustable volume control mechanisms. The system maintains calibration by dynamically adjusting chamber volume to compensate for density changes, rather than using vacuum or inert gases. This resolves the contradiction by achieving stable X-ray transmission through parameter adjustment rather than complex system design.
2Measurement precision
If empirical calibration is performed frequently to account for air density changes, then the measurement accuracy is maintained, but the time consumption and operational complexity increase
Solution Approach 1:
The patent implements preliminary action by establishing a reference calibration state at a defined air density before measurements begin. The volume adjustment mechanism is pre-configured to maintain this reference state automatically during operation, eliminating the need for frequent recalibration. This resolves the contradiction by preparing the system in advance to maintain accuracy without requiring repeated time-consuming calibration procedures.
Solution Approach 2:
The patent incorporates feedback mechanisms where sensors monitor air density conditions within the measurement chamber and automatically trigger volume adjustments to maintain the reference state. This closed-loop feedback system ensures measurement precision is maintained continuously without manual intervention or repeated calibration, resolving the time loss contradiction.
3Device complexity
If the measurement chamber volume is fixed, then the device simplicity is maintained, but the ability to compensate for air density changes is lost requiring frequent recalibration
Solution Approach 1:
The patent transforms the measurement chamber from a fixed-volume static structure to a dynamic system with adjustable volume. The chamber incorporates movable boundaries or expandable components that can change volume in response to air density variations. This dynamic capability maintains calibration validity without significantly increasing overall device complexity, resolving the contradiction between structural simplicity and calibration reliability.
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 enables continuous reliable elemental composition analysis by maintaining calibration integrity despite changes in air density, reducing the need for frequent recalibration and minimizing resource-intensive calibration procedures.
Implementation Method 1
a volume adjustment assembly arranged to adjust a volume of the measurement chamber for restoring the reference air density inside the measurement chamber after a change in air density inside the measurement chamber
Implementation Method 2
a hermetically sealed measurement chamber comprising air and provided with a measurement aperture that is sealed by a sample window
Implementation Method 3
an X-ray radiation source such as an X-ray tube for exciting a sample under study using the high-energy X-rays
Implementation Method 4
each element emits fluorescent X-rays exhibiting an energy spectrum that is characteristic to the respective element when subjected to the high-energy X-rays
Implementation Method 5
a solid-state detector such as a silicon drift detector (SDD) for capturing the fluorescent X-rays invoked from the sample by the high-energy X-rays
Implementation Method 6
Both the high-energy X-rays and the fluorescent X-rays are subject to absorption that takes place in the measurement chamber and, consequently, reliable and accurate XRF analysis requires precise calibration of the XRF analyzer instrument such that it accounts for conditions in the measurement chamber
Data Source
AI summary
Disclosed is an X-ray fluorescence analyzer instrument for analyzing the elemental composition of a sample, including: a measurement chamber including air and a measurement aperture sealed by a sample window; a radiation source inside the measurement chamber to invoke secondary radiation from the sample adjacent to the sample window exterior of the measurement chamber; a radiation detector having its receiver inside the measurement chamber, the radiation detector receiving the secondary radiation from the sample window and providing a measurement signal describing intensity of the received radiation; a controller analyzing composition of the sample based on an energy spectrum of the measurement signal based on a calibration established at a reference air density inside the measurement chamber; and a device adjusting a volume of the measurement chamber restoring the reference air density inside the measurement chamber after a change in air density inside the measurement chamber to maintain calibration validity.