Snapshot Phase-Shifting Diffraction Module for Vibration-Immune Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing interference-based microscopy systems face challenges in producing accurate images quickly while being immune to environmental factors such as vibrations and temperature changes.
Innovation Solution
The implementation of snapshot phase-shifting diffraction modules and systems that utilize a polarization grating to generate circularly polarized beams, combined with a spatial filter and a polarization camera, enables high spatial and temporal resolution phase imaging with reduced phase noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional interference-based microscopy systems are used, then phase imaging can be performed, but the imaging speed and accuracy are insufficient and the system is sensitive to environmental factors
Solution Approach 1:
The spatial filter is segmented into multiple openings (first opening and second opening) that separately process different circularly polarized light beams. This segmentation allows independent filtering of specific diffraction orders while maintaining environmental stability through the common optical path
Solution Approach 2:
A polarization grating is introduced as an intermediary element that converts linearly polarized light into two circularly polarized beams with opposite polarizations. This intermediary enables the creation of interferograms that are less sensitive to environmental disturbances while maintaining high measurement precision
2Measurement precision
If traditional phase imaging methods are used, then phase information can be obtained, but the spatial and temporal resolution are insufficient
Solution Approach 1:
The system uses periodic phase shifting through the polarization grating to generate multiple interferograms with different phase differences. This periodic action enables accurate phase reconstruction through standard phase-shifting algorithms while maintaining high imaging speed by capturing all required interferograms in a snapshot manner
Solution Approach 2:
The patent transforms the problem from spatial domain to frequency domain by using Fourier transform processing on the captured interferograms. This dimensional change allows simultaneous achievement of high spatial resolution and fast imaging speed by separating the phase information extraction from the spatial sampling constraints
3Measurement precision
If multiple interferograms are captured for phase shifting, then phase measurement accuracy improves, but the imaging time increases
Solution Approach 1:
The polarization grating creates periodic phase shifts between the two circularly polarized beams, generating multiple interferograms with different phase differences simultaneously. This allows accurate phase measurement through standard phase-shifting algorithms without requiring sequential capture over time
Solution Approach 2:
The system merges the capture of multiple phase-shifted interferograms into a single snapshot by using a polarization-sensitive detector that can simultaneously record information from both circularly polarized beams. This combining eliminates temporal separation and removes the trade-off between accuracy and speed
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 simultaneous reconstruction of high spatial frequency phase images with improved accuracy and speed, while minimizing the impact of environmental factors.
Implementation Method 1
a polarization grating positioned to receive a linearly polarized light beam and to produce two circularly polarized light beams with opposite polarizations
Implementation Method 2
a first lens positioned to receive the two circularly polarized light beams, and a spatial filter positioned at a focal plane of the first lens to receive focused light corresponding to the two circularly polarized light beam
Implementation Method 3
The spatial filter includes a first opening configured to spatially filter a first one of the two circularly polarized light beams, and a second opening configured to allow a second one of the two circularly polarized light beams to pass therethrough substantially unchanged
Implementation Method 4
a second lens positioned to receive the two oppositely circularly polarized light beams after passing through the spatial filter and to focus the received light onto an image plane
Implementation Method 5
to enable a phase measurement based on a plurality of interferograms formed by a polarization sensitive device at the image plane based on the two oppositely circularly polarized light beams
Data Source
AI summary
Snapshot phase-shifting diffraction modules and associated systems and methods are described that enable high spatial and temporal resolution phase imaging with high immunity to environmental factors such as vibrations and temperature changes. One example optical diffraction phase module includes a polarization grating to produce two circularly polarized light beams with opposite polarizations, a first lens to receive the two circularly polarized beams, and a spatial filter positioned at a focal plane of the first lens. The spatial filter includes two openings, one to spatially filter one of the two circularly polarized light beams, and another opening to allow another circularly polarized light beam to pass. The module also includes a second lens to focus the received light onto an image plane and to enable a phase measurement based a plurality of interferograms. The phase module can be incorporated into a microscope system that operates a reflection or a transmission mode.