X-ray Thickness Gauge Calibration Using Single Plate
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Solution Overview
Problem
The existing X-ray thickness gauges require multiple reference plates for precise calibration, leading to complex operations and configurations due to the need for high precision in manufacturing and assembling these plates.
Innovation Solution
An X-ray thickness gauge with a simple calibration function using one calibration plate, which measures detected doses and performs calibration curve calibration processing by storing correction curves for disturbance factors, allowing calibration without multiple reference plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple reference plates are used for calibration, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent uses a single calibration plate that replicates the function of multiple reference plates by measuring detected dose rates at different positions (first, second, and third positions) and calculating detected dose change rates. This copying approach allows one plate to provide calibration data equivalent to multiple plates, reducing device complexity while maintaining measurement precision
Solution Approach 2:
The calibration process is segmented into multiple measurement positions (first, second, third positions) around a single calibration plate. By measuring at different positions and calculating change rates, the system extracts multiple calibration data points from one plate, achieving the precision of multiple plates without the complexity of having multiple physical reference plates
2Measurement precision
If multiple reference plates with different thicknesses are used, then calibration precision is improved, but ease of operation deteriorates
Solution Approach 1:
The single calibration plate serves multiple functions: it is used for initial calibration and for subsequent calibration curve calibration. The plate performs self-validation by providing reference data that the system uses to correct its own measurements, eliminating the need for operators to manually select and switch between multiple reference plates
Solution Approach 2:
The system changes measurement parameters (detector position, measured parameter type) rather than changing physical calibration objects. By measuring detected dose rates at different positions around the same calibration plate and calculating change rates, the system generates multiple calibration data points without requiring multiple plates with different thicknesses
3Measurement precision
If multiple reference plates are incorporated, then calibration accuracy is improved, but manufacturing precision requirements increase
Solution Approach 1:
Instead of requiring multiple precisely manufactured reference plates with different thicknesses, the system uses one calibration plate and copies its calibration value by measuring at different positions. This eliminates the need for multiple precision-manufactured plates, reducing manufacturing precision requirements while maintaining calibration accuracy
Solution Approach 2:
The system transitions from varying plate thickness (one dimension) to varying measurement positions (spatial dimensions). By measuring detected dose rates at different positions around a single calibration plate of fixed thickness, the system generates multiple calibration data points without requiring multiple plates with precisely controlled different thicknesses
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 thickness measurement by calibrating the calibration curve using a single calibration plate, reducing operational complexity and eliminating the need for multiple reference plates, while allowing for precise thickness measurement and material flexibility in calibration plate selection.
Implementation Method 1
irradiating the measured object with X-ray
Implementation Method 2
measure an amount of X-ray attenuated by the plate
Data Source
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AI summary
To provide an X-ray thickness gauge having a calibration curve calibration function with a cost further reduced. An X-ray thickness gauge according to an embodiment measures a plate thickness of a measured object, based on a detected dose obtained by irradiating the measured object with X-ray and a calibration curve, and can execute a calibration curve calibration processing to calibrate the calibration curve. The X-ray thickness gauge stores a correction curve indicating detected dose change rates at a plurality of calibration points defining desired thicknesses, for each disturbance factor varying the detected dose. In addition, the X-ray thickness gauge stores a detected dose in a first state in which a calibration plate is not inserted in an X-ray beam, a detected dose in a second state in which the calibration plate is inserted in the X-ray beam, and a detected dose in a third state in which the X-ray is blocked, here the detected doses are used at the time of creating the calibration curve. Furthermore, the X-ray thickness gauge corrects the detected doses at the respective calibration points using the correction curve, and calibrates the calibration curve, based on the relevant corrected detected doses.