Linear Polarization Axis Detection Using Wave Plate Phase Retrieval
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Solution Overview
Problem
Conventional methods for detecting the angle of transmission axis in polarizers are costly, require large equipment, and have long measurement times, leading to inaccuracies that affect optical performance and user experience in products like 3D glasses and optical measurement systems.
Innovation Solution
A linear polarization component detection system and method using a light source, wave plate, and phase retrieval device to measure the phase difference induced by rotating the wave plate, allowing for accurate determination of the transmission axis angle without requiring complex equipment or specialized software.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If polarimetry method is used to detect transmission axis angle by rotating polarizer and observing light intensity changes, then the detection process is quick and straightforward, but the measurement accuracy is not satisfied
Solution Approach 1:
The patent introduces a wave plate as an intermediary component between the polarizer and detector. The wave plate transforms the polarization state of light in a controlled manner, enabling more precise measurement of the transmission axis angle. This intermediary element allows the system to achieve higher measurement precision while maintaining relatively simple operation and acceptable detection speed.
2Measurement precision
If interferometry method is used with two mutually perpendicular polarizers to observe optical interference fringes, then high accuracy is achieved, but large optical interferometers are required and measurement time increases
Solution Approach 1:
The patent extracts the essential interference measurement function from the complex optical interferometer system. By using a simplified configuration with a wave plate and single detector, it isolates the critical measurement mechanism while removing unnecessary complex components. This allows achieving high measurement precision without requiring large-scale optical interferometers.
Solution Approach 2:
The patent creates a simplified optical path that copies the essential measurement function of complex interferometry. Instead of using full optical interferometers, it employs a wave plate-based system that replicates the interference measurement capability in a compact form, reducing both device size and complexity while maintaining measurement accuracy.
3Difficulty of detecting and measuring
If image analysis method is used to capture transmitted light images and determine polarization direction, then detection capability is provided, but specialized image processing software and precise image capture devices are required
Solution Approach 1:
The patent replaces the complex image capture and processing system with a simpler optical-mechanical measurement approach. Instead of using image cameras and software analysis, it employs a wave plate-based optical system with a photodetector that directly measures polarization parameters. This substitution reduces both hardware complexity and software requirements while maintaining detection capability.
Data Source
AI summary
The present invention relates to a linear polarization component detection system. The system includes elements of a light source configured to emit a detection beam propagating along an optical path; a linear polarization component to be tested configured in the optical path and providing for the detection beam to pass through and transform into a polarized beam; a wave plate configured in the optical path and providing for the polarized beam to pass through and transform into a polarized interference beam; and a phase retrieval device configured to receive the polarized interference beam and sense a light intensity signal from the polarized interference beam.