Spatial Light Modulation Phase Patterns for Incident Position Estimation
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Solution Overview
Problem
Existing spatial light modulation devices face challenges in accurately estimating the incident position of light onto the spatial light modulation unit due to misalignment issues, which are exacerbated by external factors like vibration and temperature changes.
Innovation Solution
A spatial light modulation device comprising a spatial light modulation unit, a pattern setting unit, a detection unit, and an estimation unit, where the phase pattern is arranged to form focused light spots, and the estimation unit determines the incident position based on intensity information of these spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the near field pattern (NFP) of incident light is captured and its movement is observed to specify incident position, then the incident position can be specified based on NFP position in the captured image, but external factors such as vibration or temperature changes cause misalignment between the field of view and the spatial light modulation unit position
Solution Approach 1:
The system captures the spatial distribution pattern of focused light spots and uses this feedback information to determine the incident light position relative to the phase pattern. By continuously monitoring the pattern and comparing it with reference patterns, the system can identify misalignment caused by vibration or temperature changes and compensate for it, maintaining reliable alignment without requiring strict mechanical stability
Solution Approach 2:
The patent establishes a reference relationship between the detection unit field of view and the spatial light modulation unit position during a calibration phase before actual operation. This preliminary calibration creates a mapping that allows the system to interpret NFP movements in terms of incident light position while compensating for external disturbances, rather than requiring perfect mechanical alignment to be maintained throughout operation
2Measurement precision
If calibration is performed to associate the field of view with the spatial light modulation unit position for accurate incident position estimation, then accurate estimation becomes possible, but the system complexity and calibration time increase
Solution Approach 1:
The phase pattern serves multiple functions: it modulates the incident light for the primary processing function and simultaneously forms a detectable pattern of focused light spots that provides information about incident light position and alignment status. This multi-functionality eliminates the need for separate calibration procedures and position sensing mechanisms, reducing system complexity while maintaining high estimation accuracy
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 configuration enables easy and accurate estimation of the incident light position, effectively addressing misalignment issues and improving the precision of light processing in spatial light modulation devices.
Implementation Method 1
a phase pattern used for modulating incident light L is displayed, and light L is made incident on the phase pattern
Implementation Method 2
the phase pattern arranged to form a plurality of focused light spots on the detection unit 7 using the light L modulated by the set phase pattern
Data Source
AI summary
In a spatial light modulation device, a detection unit detects light modulated by a spatial light modulation unit. An estimation unit estimates an incident position of the light onto the spatial light modulation unit on the basis of a detection result obtained by the detection unit. A phase pattern set by a pattern setting unit includes a phase pattern arranged to form a plurality of focused light spots on the detection unit using the light modulated in the set phase pattern. The detection unit detects intensity information of the focused light spots. The estimation unit estimates the incident position of the light onto the spatial light modulation unit on the basis of a comparison result obtained from the intensity information of the plurality of focused light spots detected by the detection unit.