Geometric Phase Optical Mask for Vibration-Resistant Phase Detection
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Solution Overview
Problem
Conventional phase shifting methods for phase detection are vulnerable to external vibrations, requiring multiple cameras and complex setups, which increase cost and complexity, and are not suitable for industrial environments with irregular vibrations.
Innovation Solution
A phase detection device using a geometrical phase optical element with an optical mask that phase-shifts object and reference light, employing a circular polarization beam splitter and optical array to generate multiple phase-shifted interference patterns without multiple cameras, robust against vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple cameras are used to simultaneously photograph phase-shifted interference patterns, then vibration resistance is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple phase-shifted interference pattern photographs into a single photograph taken by one camera. The optical mask integrates multiple phase-shifting functions that would otherwise require multiple cameras, merging the capabilities of multiple devices into one unified component.
Solution Approach 2:
The optical mask performs multiple functions simultaneously: it generates multiple phase-shifted interference patterns in a single shot, acts as a beam splitter, and enables vibration-resistant measurement. This multi-functionality eliminates the need for separate cameras and complex synchronization systems.
2Reliability
If multiple cameras are used to simultaneously photograph phase-shifted interference patterns, then vibration resistance is improved, but cost increases
Solution Approach 1:
The optical mask creates multiple copies of the interference pattern with different phase shifts within a single photograph. Instead of using multiple expensive cameras to capture separate patterns, the system generates multiple pattern copies in one shot, dramatically reducing equipment costs.
Solution Approach 2:
The patent merges the functions of multiple expensive cameras into a single camera system with an optical mask attachment. This consolidation eliminates the need to purchase and maintain multiple high-cost imaging devices while achieving the same vibration-resistant measurement capability.
3Measurement precision
If sequential phase adjustment is used to obtain phase-shifted interference patterns, then measurement precision is maintained, but vulnerability to vibration increases
Solution Approach 1:
The optical mask pre-establishes multiple phase-shifted interference patterns before the measurement process begins. All phase-shifted patterns are created in advance within a single photograph, eliminating the need for sequential adjustment during measurement and making the system immune to vibration during data collection.
Solution Approach 2:
The optical mask creates periodic phase-shifted interference patterns (e.g., 0°, 90°, 180°, 270° shifts) that are all captured simultaneously. This periodic structure is embedded in the optical path before measurement, allowing precise phase detection without sequential scanning that would expose the system to vibration.
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 device achieves robust phase detection with a simple structure, reducing the need for multiple cameras and minimizing the impact of external vibrations, while maintaining high detection accuracy and efficiency.
Implementation Method 1
an optical array including a plurality of optical pixels that induce a geometrical phase effect that phase-shifts the object light and the reference light two times a predetermined optical axis rotation angle
Implementation Method 2
a circular polarization beam splitter configured to transmit some circular polarization components, among circular polarization components that pass through the optical array
Implementation Method 3
an optical mask configured to phase-shift object light and reference light having different circular polarizations generated through interferometry
Data Source
AI summary
Disclosed is a phase detection device using phase shifting, the device including a geometric phase optical element. According to one aspect of the present embodiment, provided is a phase detection device characterized by comprising an optical mask for phase-shifting object light and reference light having different circular polarizations and generated through an interferometer, wherein the optical mask comprises: an optical array including geometric phase optical pixels that phase-delay the object light and the reference light by twice a predetermined optical axis rotation angle; and a circular polarization beam splitter which is configured to transmit some of circular polarization component transmitted through the optical array.