Light Scattering Measurement Sensor Array for Gloss and DOI Analysis
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Solution Overview
Problem
Existing gloss meters are unable to accurately measure distinctness of image (DOI) and haze due to limitations in component selection and orientation, which prevent them from differentiating between these surface characteristics and standardizing results, especially on complex surfaces.
Innovation Solution
A system and apparatus that uses a sensor and lens arrangement to calculate gloss, DOI, and reflection haze by measuring light separation from the specular angle, with a collimated light beam directed at the sample and a sensor positioned at the focal point to determine surface characteristics based on light scattered away from the focal point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard gloss meters measure reflected light at ± several degrees from the specular angle, then the device structure is simple, but the device cannot accurately measure DOI and differentiate it from haze
Solution Approach 1:
The sensor is divided into multiple segments or zones (central region for specular reflection, outer regions for scattered light). Each segment detects light from different angular ranges, enabling separate measurement of DOI (light scattered by ±0.3 degrees) and haze (light scattered at larger angles like ±2 or ±5 degrees) without requiring multiple separate devices
Solution Approach 2:
The invention transitions from measuring only light intensity at a single angular position to measuring light distribution across a two-dimensional angular space. By arranging sensors at different positions corresponding to different scattering angles, the system captures spatial information about light scattering patterns, enabling differentiation between DOI and haze characteristics
2Measurement precision
If gloss meters use a fixed angle light beam, then the measurement setup is simple, but the device cannot evaluate light spread from the specular angle due to irregular surfaces
Solution Approach 1:
The measurement system is designed to perform multiple functions: it can measure gloss (specular reflection at fixed angle), DOI (light scatter at ±0.3 degrees), and haze (light scatter at larger angles). This multi-functionality is achieved through a single integrated sensor array that can detect light across various angular deviations from the specular direction, adapting to different surface conditions without requiring separate measurement devices
3Measurement precision
If prior art devices measure at a single position, then the device structure is simple, but the device is limited in determining true DOI and differentiating it from haze
Solution Approach 1:
A lens is introduced as an intermediary optical element between the sample and the sensor array. The lens focuses light from different angular directions to different positions on the sensor, creating a spatial mapping of scattering angles. This intermediary enables the sensor array to resolve angular information without requiring complex mechanical scanning or multiple precisely positioned detectors
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
Enables accurate and precise measurement of DOI and haze, allowing for better analysis of surface conditions on non-uniform surfaces, and can be adapted for both reflecting and transmitting samples, providing improved clarity and haze characterization.
Implementation Method 1
a lens assembly which focuses the reflected light onto the sensor array
Implementation Method 2
measuring the degree of scattering that light undergoes via reflection off the sample surface
Data Source
AI summary
An apparatus and method for providing a solution that enables technicians or other technical professionals to obtain accurate gloss, haze and DOI values for a reflecting sample due to the surface conditions of the sample. The apparatus and method allow for the generation of a data model of the surface of a sample using a sensor array designed to detect the divergence of a collimated beam of light reflected off the surface of the sample. The same principle enables technical professionals to obtain accurate haze and clarity values for a transparent or translucent sample that is trans-illuminated by light.