Confocal Displacement Sensing With Dynamic Range Reset
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Solution Overview
Problem
Conventional displacement measuring devices face challenges in accurately measuring distances to measurement target surfaces, particularly for workpieces with anti-reflective coatings or multilayer structures, due to unstable reflected light and positional deviations, leading to incorrect processing of light reflections and inaccurate distance measurements.
Innovation Solution
A displacement measuring device and method that includes a light projecting part, a sensor head with a confocal optical system, and a control part that calculates distances based on received light, processing only values within a preset numerical range and dynamically resetting this range to ensure accurate measurements by focusing on peak light amounts and adjusting settings accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a displacement measuring device processes light reflected from multiple measurement positions, then it can measure distances to multiple surfaces, but it may incorrectly process light from wrong surfaces leading to measurement errors
Solution Approach 1:
The patent applies local quality by assigning different numerical ranges to different measurement target surfaces. Each surface has its own dedicated numerical range based on its distance from the sensor head. The control part selectively processes reflected light based on whether the calculated distance falls within the appropriate range for that specific surface, ensuring accurate identification and measurement of each surface without confusion.
2Device complexity
If the measurement range is fixed, then the device structure is simple, but it cannot adapt to positional displacements of the workpiece
Solution Approach 1:
The patent implements dynamics by making the numerical range adjustable and resettable. The control part can reset the numerical range based on actual measurement results and positional displacements. This dynamic adjustment allows the measurement system to adapt to workpiece positional changes while maintaining accurate measurement of the intended surface, resolving the conflict between fixed simplicity and adaptive flexibility.
3Quantity of substance
If the device processes all reflected light signals, then it captures all potential measurement data, but it includes unreliable data leading to measurement errors
Solution Approach 1:
The patent applies the extraction principle by selectively filtering reflected light signals based on whether their calculated distances fall within the preset numerical range. The control part extracts only the reliable measurement data corresponding to the intended measurement target surface and discards unreliable data from other surfaces. This selective extraction ensures high data reliability while maintaining comprehensive measurement capability.
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 approach allows for precise and accurate measurement of distances to each surface by filtering out non-reliable data and adjusting the measurement range, reducing error processing and enhancing data acquisition for surfaces with varying reflectivity and positional changes.
Implementation Method 1
a light projecting part (12) which generates light
Implementation Method 2
receiving light reflected by a measurement target surface of the measurement target from the irradiated light
Implementation Method 3
a sensor head (20) which irradiates a measurement target with the light and receives light reflected by a measurement target surface
Data Source
AI summary
A displacement measuring device capable of accurately measuring a distance to a measurement target surface is provided. The displacement measuring device includes a light projecting part generating light, a sensor head irradiating a measurement target with the light and receiving light of the irradiated light reflected by a measurement target surface of the measurement target, and a control part calculating a value indicating a distance to the measurement target surface on the basis of the light received by the sensor head. The control part processes the calculated value as the value indicating the distance to the measurement target surface on condition that the calculated value is included in a preset numerical range and resets the preset numerical range on the basis of the calculated value.