Metrology Probe Orientation Error Compensation
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Solution Overview
Problem
Metrology devices face challenges in accurately measuring due to orientation errors, such as cosine errors, which occur when the probe is not parallel or perpendicular to the surface being measured, leading to inaccurate readings, especially in tight spaces where alignment is difficult to set and identify.
Innovation Solution
Incorporating orientation sensors and a processor in the metrology device to detect misalignment and provide automated compensation by calculating a correction factor for the measurement, and optionally alerting the user to adjust the device for accurate readings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual alignment methods are used to orient the metrology device to the surface, then device complexity is reduced, but measurement precision deteriorates due to orientation errors
Solution Approach 1:
An intermediary computational system is introduced between the raw measurement and the final result. The processor receives raw measurement data along with orientation error information (from user input or sensors), calculates correction factors, and applies them to produce corrected measurements. This intermediary computation layer enables high precision without requiring complex physical alignment mechanisms.
2Ease of operation
If automated orientation detection sensors are added to the device, then ease of operation improves, but device complexity increases
Solution Approach 1:
The device is equipped with self-aligning capabilities through automated sensors (accelerometers, gyroscopes, magnetometers) that continuously monitor orientation and automatically provide correction data to the processor. The system serves itself by autonomously detecting orientation errors and applying corrections without requiring manual intervention, thereby improving ease of operation.
Solution Approach 2:
The sensor suite serves multiple functions: it detects device orientation, calculates correction factors, and can trigger alerts to users. This multi-functional approach consolidates what could be separate systems into a unified orientation management subsystem, minimizing the increase in device complexity while maximizing ease of operation.
3Measurement precision
If correction factors are calculated and applied automatically, then measurement precision improves, but loss of time increases due to computational processing
Solution Approach 1:
Correction factors are pre-calculated and stored in lookup tables based on known orientation error characteristics. When a measurement is taken, the system quickly retrieves the appropriate correction factor from memory rather than performing complex real-time calculations, significantly reducing processing time while maintaining measurement precision.
Solution Approach 2:
The system transforms the measurement problem by changing parameters from raw dimensional measurements to corrected measurements that account for orientation errors. By applying mathematical transformations (multiplication by correction factors) rather than physical adjustments, the system achieves high precision with minimal time loss.
4Ease of operation
If alerts are provided to users about misalignment, then ease of operation improves, but device complexity increases
Solution Approach 1:
The system implements feedback by monitoring orientation parameters and providing alerts to users when misalignment exceeds acceptable thresholds. This feedback loop enables users to quickly correct their positioning without requiring deep understanding of the underlying geometry, improving ease of operation through intuitive guidance.
Data Source
AI summary
A metrology device with automated compensation and/or alert for orientation errors. The device may include a processor, a probe portion and at least one orientation sensor. The probe provides an output representative of a raw measurement of a characteristic of a device under test and the orientation sensor provides a sensor output representative of an orientation of the metrology device to the device under test. The processor applies a correction factor to the raw measurement in response to the sensor output to establish a compensated measurement to compensate for misalignment of the metrology device to the device under test. In addition, or alternatively, the processor provides an alert indicating the existence and/or extent of the misalignment.