Wavefront-division polarimetric analysis device for Stokes vector measurement
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Solution Overview
Problem
Wavefront-division polarimeters face imprecision in measuring polarisation states due to variations in luminous intensity, which are influenced by experimental conditions, leading to inaccurate results.
Innovation Solution
A wavefront-division polarimetric analysis device that splits an upstream light beam into multiple beams with different propagation angles, modifies their polarisation states, and uses polarisation separation means to generate orthogonal polarised beams, allowing detectors to measure luminous intensity independently of experimental conditions, with processing means to determine the polarisation state by calculating the Stokes vector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wavefront-division polarimetric analysis device is used to determine polarisation states of different source-points, then measurement capability for multiple points is improved, but measurement precision deteriorates due to luminous intensity variations
Solution Approach 1:
The wavefront is divided into multiple segments using a wavefront division element (such as a prism or grating), creating multiple spatially separated beams from different source points. Each beam is independently analyzed by corresponding detector elements, enabling simultaneous measurement of polarisation states at multiple points while maintaining precision through independent detection pathways that avoid cross-contamination of intensity variations
Solution Approach 2:
The patent transforms the measurement parameters by using ratios of luminous intensities rather than absolute intensity values. By calculating polarisation states from intensity ratios (e.g., I1/I2, I3/I4) rather than raw intensity measurements, the system eliminates sensitivity to variations in overall luminous intensity, thereby maintaining measurement precision across different experimental conditions while enabling multi-point measurement capability
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 provides accurate and robust polarisation state measurements by isolating and processing the luminous intensities of non-overlapping polarised beams, eliminating the impact of experimental conditions and enhancing measurement precision.
Implementation Method 1
a wavefront-division polarimetric analysis device including a birefringent prism, a segmented polariser and an imaging spectrometer. This polarimeter produces, from a luminous object to be analysed, a plurality of images of this object
Implementation Method 2
wavefront-division means and polarisation modification means are arranged in the polarimetric analysis device in such a manner that the wavefront-division means are placed upstream or downstream from the polarisation modification means
Implementation Method 3
a wavefront-division polarimetric analysis device including a birefringent prism, a segmented polariser and an imaging spectrometer
Implementation Method 4
polarisation separation means, arranged so as to intercept said N split light beams and adapted to generate, from each of said N split light beams, two light beams polarised according to two orthogonal polarisation states and along two different directions of propagation
Data Source
AI summary
An accurate and robust wavefront-division polarimetric analysis method and device, allows the quasi-instantaneous measurement of the polarization states of a luminous object. The device can be used to produce a plurality of light beams, all polarized according to different polarization states, from a single upstream light beam. The polarized light beams, which do not overlap and which carry information items that are complementary in terms of polarization, are analyzed simultaneously by a plurality of detectors that measure the luminous intensity of each beam. Processing elements digitally process the luminous intensity values obtained in order to determine the polarization state of the upstream light beam. The operations performed by the processing elements prevent luminous intensity variations in the split light beams during the division of the wavefront of the upstream light beam. Therefore, the wavefront-division polarimetric analysis device is robust and its accuracy is not hindered by the experimental conditions.