Measurement Probe Head Magnetic Sensing for CMM Temperature Compensation
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Solution Overview
Problem
Conventional coordinate measuring machines (CMMs) face inaccuracies due to probe/stylus deflection caused by ambient temperature variations, leading to unreliable measurements of workpieces.
Innovation Solution
A measurement probe temperature compensation system is introduced, featuring a magnetic sensor that emits a magnetic signal based on ambient temperature, allowing for the determination of positional offsets, which are used to adjust measurement data and compensate for deflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional CMM probes are used without temperature compensation, then the device complexity remains low, but measurement precision deteriorates due to probe deflection from temperature variations
Solution Approach 1:
The patent replaces mechanical temperature compensation methods with a magnetic sensing system. A magnetic sensor (such as a Hall effect sensor) detects the magnetic field generated by a magnet embedded in the probe, providing temperature-induced positional offset data without requiring mechanical feedback mechanisms or complex mechanical compensation structures.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the probe and the measurement system. The magnet embedded in the probe generates a magnetic field that serves as a mediator to transmit temperature-related positional information to the magnetic sensor, enabling indirect measurement of probe deflection without direct mechanical contact or complex sensing mechanisms.
2Measurement precision
If temperature compensation systems are added to CMM probes, then measurement precision improves, but device complexity increases due to additional sensors and processing requirements
Solution Approach 1:
The patent replaces complex mechanical or optical temperature compensation systems with a simple magnetic sensing approach. The magnetic sensor and embedded magnet provide a compact, low-complexity solution that directly measures probe position changes caused by temperature without requiring additional mechanical components, optical paths, or complex processing hardware.
3Measurement precision
If magnetic sensors are embedded in probes to detect temperature-induced offsets, then measurement accuracy improves, but the probe structure becomes more complex
Solution Approach 1:
The patent replaces complex mechanical sensing structures with a magnetic field-based detection system. The magnetic sensor and embedded magnet create a non-contact, field-based measurement mechanism that requires minimal structural modification to the probe while providing accurate temperature-induced offset detection.
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
The system provides accurate temperature-compensated measurements by accounting for stylus deflections at different ambient temperatures, ensuring precise measurement of workpieces.
Implementation Method 1
The active portion uses magnetic induction to produce the magnetic signal received by the passive portion
Data Source
AI summary
A measurement probe temperature compensation system for a coordinate measurement machine may include a measurement probe configured to measure a workpiece on the coordinate measurement machine and a magnetic sensor associated with the measurement probe. The measurement probe has a plurality of positional offsets at a plurality of different ambient temperatures. The magnetic sensor is configured to emit a magnetic signal based on a current ambient temperature in response to receipt of a magnetic field.