Light Measurement Device Optical Axis Adjustment
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Solution Overview
Problem
Light measurement devices face challenges in maintaining high measurement precision due to changes in the optical system, such as loosening of parts causing shifts in optical axes and refractive index changes from environmental factors, leading to difficulties in continuous alignment and interference maintenance.
Innovation Solution
A light measurement device with a phase-changing unit, phase-fixing unit, adjustment mechanism, multiplexer, and imaging element, where the control unit adjusts the propagation direction based on luminance values of bright portion points in the interference image to maintain precise optical axis alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the optical system is used for light measurement, then measurement capability is achieved, but measurement precision deteriorates due to optical axis shifts and phase changes
Solution Approach 1:
The patent implements a feedback mechanism where the imaging element detects the interference image, the control unit analyzes the position of bright portion points in the interference image, and automatically adjusts the propagation direction of light beams through the adjustment mechanism to maintain optimal optical axis alignment. This closed-loop feedback system continuously corrects deviations caused by environmental factors or mechanical loosening, thereby maintaining high measurement precision.
Solution Approach 2:
The system performs self-alignment by automatically detecting its own optical axis deviation through the interference image and correcting it without external intervention. The control unit monitors the interference pattern and autonomously adjusts the optical components to maintain proper alignment, enabling the system to self-correct for stability issues.
2Measurement precision
If automatic adjustment is implemented to maintain optical axis alignment, then measurement precision is maintained, but device complexity increases
Solution Approach 1:
The imaging element serves multiple functions: it captures the interference image for measurement purposes and simultaneously detects the position of bright portion points for optical axis alignment verification. The control unit also performs dual roles in analyzing both the interference pattern for measurement and the bright portion positions for alignment detection, reducing the need for separate dedicated components.
Solution Approach 2:
The patent combines the measurement function and the alignment detection function into a single interference image analysis process. By using the same optical path and imaging element for both purposes, the system avoids adding separate alignment detection optics, thereby minimizing the increase in device complexity while maintaining measurement precision.
3Stability of the object's composition
If environmental factors are controlled to maintain refractive index stability, then optical axis stability improves, but ease of operation deteriorates due to stringent environmental requirements
Solution Approach 1:
Instead of relying on stringent environmental control, the system uses active feedback to detect and correct optical axis deviations caused by refractive index changes. The imaging element continuously monitors the interference image, and the control unit adjusts the optical path to compensate for environmental variations, allowing the system to operate in normal environmental conditions without sacrificing stability.
Solution Approach 2:
The patent replaces passive mechanical stabilization (such as rigid mounting and thermal isolation) with active optical correction. Rather than mechanically preventing optical axis shifts through environmental control, the system uses electronic detection and automated optical adjustment to maintain alignment, thereby improving ease of operation while maintaining stability.
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 solution enables the maintenance of high measurement precision by continuously adjusting the optical axis and phase alignment, ensuring consistent interference images and improved measurement accuracy.
Implementation Method 1
two split light beams realized by splitting transmitted light or reflected light of the light from the measurement object
Implementation Method 2
a phase-changing unit that changes a phase of first light that is one beam from among two split light beams; a phase-fixing unit that maintains a phase of second light that is the other beam
Implementation Method 3
a multiplexer that causes interference between the first and second light that are supplied from the phase-changing unit and the phase-fixing unit, respectively
Implementation Method 4
an imaging element that detects light that is interfered with by the multiplexer
Data Source
AI summary
A light measurement device that maintains high measurement precision. The light measurement device includes: light source that irradiates light upon measurement object; branch part that splits transmitted light or reflected light from measurement object; phase-changing unit that changes the phase of one beam of the branched light beams; phase-fixing unit that maintains the phase of the other beam of the branched light beams; adjustment mechanism, which is provided in phase-changing unit or phase-fixing unit, for adjusting the propagation direction of light; multiplexer that causes the light emitted by each of phase-changing unit and phase-fixing unit to interfere with each other; detection unit that detects light that is interfered with by multiplexer; and control unit that controls the adjustment mechanism on the basis of the luminance values of an interference image that is detected by detection unit and adjusts the propagation direction of light in phase-changing unit or phase-fixing unit.