Double Aperture System for Multi-Angle Light Scattering Detectors
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Solution Overview
Problem
Existing devices for measuring static multi-angle light scattering in liquid media face interference from scattered light from unobserved angular ranges and remissions, leading to unstable and clipped detector signals due to the small volume of glass measuring cells, which complicates accurate characterization of sample properties.
Innovation Solution
A device with a cylindrical measuring cell and a double aperture system consisting of a first inner and a second outer aperture system, both circular and concentric around the axis, is used to illuminate the sample transversely with a laser beam, allowing only specific angular ranges of scattered light to reach detectors while blocking out unobserved scattered light and remissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a small volume glass measuring cell is used, then the liquid flow can be maintained homogeneous and peak broadening is avoided, but scattered light from unobserved angular ranges and remissions interfere with detector signals causing instability and clipping
Solution Approach 1:
The aperture system is divided into multiple independent aperture elements arranged in specific patterns. Each aperture element independently defines a specific angular range, allowing the system to segment the scattered light from different angles and block unwanted directions while maintaining the small measuring cell volume for homogeneous flow.
Solution Approach 2:
The aperture system introduces local optical properties at specific positions within the measuring cell. By placing apertures at strategically located positions and orientations, the system creates localized light blocking zones that prevent scattered light from unobserved angular ranges from reaching detectors, while leaving the rest of the cell volume small enough for homogeneous flow.
2Adaptability or versatility
If detectors are arranged to measure scattered light at multiple angles, then comprehensive sample characterization is achieved, but scattered light from unobserved angular ranges and remissions cause signal interference and instability
Solution Approach 1:
The aperture system segments the optical path for each detector, creating dedicated angular acceptance windows. Each detector receives light only from its specific angular range defined by corresponding aperture elements, preventing cross-contamination from scattered light at other angles and ensuring stable, interference-free measurements across multiple angles.
Solution Approach 2:
The aperture system acts as an intermediary optical element between the measuring cell and detectors. It selectively transmits or blocks light based on angular direction, mediating the interaction between scattered light from the sample and the detectors to ensure only desired angular ranges reach each detector, thereby improving signal reliability.
3Productivity
If the measuring cell volume is kept small to avoid peak broadening, then flow homogeneity is maintained, but remissions from laser beam interfaces shift closer to scattering centers causing signal disturbance
Solution Approach 1:
The aperture system introduces local light blocking properties at specific positions within the small measuring cell volume. By strategically placing aperture elements near interfaces where remissions occur, the system locally suppresses harmful reflected light without increasing the overall cell volume, thereby maintaining measurement efficiency and flow homogeneity while eliminating signal disturbance from remissions.
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 minimizes interference from unobserved angular range scattered light and remissions, enhancing measurement sensitivity and stability, enabling precise detection of light scattered within defined angular ranges from 3° to 172°, thus improving the accuracy of sample characterization.
Implementation Method 1
A sample is illuminated with a laser beam and the scattered light is measured at different scattering angles
Implementation Method 2
the first inner aperture system and the second outer aperture system are designed and arranged in a circular and concentric manner around the axis of the measuring cell... so that only light of a certain angular range falls into the corresponding detector
Data Source
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AI summary
The device has a laser (1) which illuminates a liquid medium with a sample in a polymer or glass measuring cell (3) by radiating a laser beam (2) transversely to the filling or flow direction of liquid medium within the measuring cell. The detectors (6) are arranged outside of an outer diaphragm system (5), for collecting the light scattered on the sample at different angle ranges. The inner diaphragm system (4) and outer diaphragm system are arranged circularly and concentrically around the axis of measuring cell. Independent claims are included for the following: (1) method for measurement of light scattering properties of sample in liquid medium; and (2) use of light scattering properties measurement device.