Probe Unit Correction for Thermal Expansion in Shape Measuring
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Solution Overview
Problem
Shape measuring apparatuses face inefficiencies and measurement errors due to the need for frequent calibration of multiple probe types and forms, especially when the measurement environment temperature fluctuates, leading to inaccurate readings.
Innovation Solution
A correction method for the probe unit that involves calibrating a standard and altered measuring tip, acquiring temperature data, calculating correction values for linear expansion, and applying these corrections to obtain accurate measurements in changing environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple probes or probe alteration forms are used to measure complicated workpieces, then measurement efficiency is improved, but calibration time and effort increase significantly
Solution Approach 1:
The patent establishes a universal calibration method where one standard probe calibrates multiple alteration forms through coordinate transformation. The calibration data obtained from the standard probe is reused across different probe configurations by applying mathematical transformations, making the calibration process multi-functional and eliminating the need for separate calibration of each probe type.
Solution Approach 2:
The patent changes the calibration approach from physical recalibration to parameter transformation. By using coordinate system transformations and parameter calculations, the system adapts calibration data from one probe configuration to another without physical re-calibration, thus reducing calibration time while maintaining measurement accuracy.
2Measurement precision
If calibration is performed frequently to maintain accuracy in fluctuating temperatures, then measurement precision is improved, but measurement efficiency deteriorates
Solution Approach 1:
The patent performs preliminary calibration with the standard probe once, storing the calibration data for reuse. This preliminary action eliminates the need for repeated calibration operations when measuring different probe alteration forms, maintaining measurement precision while improving efficiency by avoiding redundant calibration steps.
Solution Approach 2:
The patent creates a virtual copy of calibration data from the standard probe and applies it to alteration forms through coordinate transformation. Instead of physically recalibrating each probe, the system copies and transforms the calibration parameters, maintaining accuracy without the time cost of repeated physical calibration.
3Reliability
If all probes are calibrated in all alteration forms to ensure accuracy, then measurement reliability is improved, but device complexity and calibration effort increase
Solution Approach 1:
The patent segments the calibration process into two parts: (1) comprehensive calibration of the standard probe, and (2) mathematical transformation to derive alteration form parameters. This segmentation reduces calibration complexity by separating the actual measurement calibration from the configuration-specific parameter derivation.
Solution Approach 2:
The patent introduces coordinate transformation as an intermediary between the standard probe calibration and alteration form measurements. This intermediary mathematical process translates calibration data across different probe configurations, reducing the need for direct calibration of each form while maintaining 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 method allows for accurate measurement values even with temperature fluctuations, reducing the need for frequent recalibration of all probes and forms, thereby enhancing measurement efficiency and reducing calibration efforts.
Implementation Method 1
a reference tip coordinate correction step of calculating, as a reference tip correction coordinate value, a correction value of the reference tip coordinate value to which linear expansion is added
Data Source
AI summary
There is provided a probe unit correction method for correcting linear expansion of a probe unit to obtain an accurate measurement value. First, a probe offset value is calculated as a model. Then, a probe unit correction method includes a temperature data acquisition step of acquiring a temperature difference between a temperature at a time of calibration and a temperature of a current measurement environment, a reference tip coordinate correction step of calculating, as a reference tip correction coordinate value, a correction value of a reference tip coordinate value to which linear expansion is added, and a probe offset correction step of calculating, as a probe offset correction value, a correction value of a probe offset value to which the linear expansion is added.