Angular Spectral Filter Assembly for Spatially Resolved Light Scattering
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Solution Overview
Problem
Conventional laser light scattering techniques struggle to capture spatial structures and dynamic properties of test articles in harsh environments due to limited spatial information from point measurements and interference from strong stray light, particularly in applications like plasma diagnostics.
Innovation Solution
The use of angular spectral filters, such as Volume Bragg grating filters, positioned along a non-zero angle to the light axis, with adjustable pitch and yaw angles, allows for one-dimensional measurement and effective rejection of unwanted wavelengths, enhancing spatial resolution and capturing extended regions of light scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional point measurement techniques are used, then measurement simplicity is maintained, but spatial information and measurement precision are limited
Solution Approach 1:
The patent transitions from point measurements to line measurements by positioning the collection assembly at a non-zero angle relative to the light axis, enabling one-dimensional spatially resolved measurements along the light axis while maintaining measurement feasibility through angular spectral filtering
2Measurement precision
If angular spectral filters are positioned at non-zero angles, then spatial resolution and signal isolation are improved, but device complexity and alignment difficulty increase
Solution Approach 1:
The patent employs adjustable filter assemblies that can be dynamically positioned and oriented at optimal angles relative to the light axis, allowing the system to adapt to different measurement conditions and optimize signal isolation while managing alignment complexity through adjustability rather than fixed complex arrangements
Solution Approach 2:
The patent introduces angular spectral filters as intermediary components positioned between the test article and collection assembly, which mediate the light path by selectively filtering wavelengths at specific angles, thereby isolating weak scattering signals from strong stray light without requiring direct complex interactions between other system components
3Object-affected harmful factors
If multiple angular spectral filters are used, then unwanted wavelengths are effectively rejected, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent divides the filtering function into multiple angular spectral filters positioned at different angles relative to the light axis, where each filter segment handles specific wavelength ranges or angular ranges, collectively achieving comprehensive stray light rejection while maintaining manageable individual filter complexity
Solution Approach 2:
The patent utilizes angular spectral filters whose filtering characteristics change with orientation angle, allowing the system to reject unwanted wavelengths by adjusting filter angles rather than using multiple fixed filters, thereby reducing device complexity while maintaining effective stray light rejection
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 enables high-throughput, spatially resolved measurements of scattering properties, overcoming the limitations of point measurements by isolating weak Raman and Thomson scattering signals while maintaining high spatial resolution, suitable for applications like plasma diagnostics and medical scanning.
Implementation Method 1
the first angular spectral filter and the second angular spectral filter each comprise a Volume Bragg grating filter
Implementation Method 2
Laser light scattering is a diagnostic technique which allows non-perturbative access to test articles in physically harsh high-pressure/high-temperature environments
Data Source
AI summary
A system for measurement of light scattering from a test article includes a light emitting device, configured to emit a light beam onto the test article along light axis, a collection assembly configured to collect scattered light from the test article along a measurement axis that is oriented at a non-zero angle from the light axis, wherein the collection assembly includes a first angular spectral filter, and a second angular spectral filter spaced from the first angular spectral filter along the measurement axis, wherein a position or orientation of at least one of the first angular spectral filter and the second angular spectral is adjustable relative to the measurement axis.