Optical Measurement Device Speckle Contrast Versatility
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Solution Overview
Problem
Existing speckle contrast measurement devices lack versatility in imaging conditions, failing to ensure compatibility with speckle contrasts obtained from different measurement devices under varying imaging conditions.
Innovation Solution
An optical measurement device with a two-dimensional sensor array and a calculation unit that maintains a constant size of the light-emitting region, determined by the diffraction limited spot and optical system parameters, allowing for consistent speckle or sparkle contrast calculation across different imaging conditions, including variations in imaging distance, focal length, and F-number.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the imaging conditions (imaging distance, focal length, F-number) are varied to improve measurement versatility, then the adaptability of the measurement device is improved, but the compatibility of speckle contrast measurements across different imaging conditions deteriorates
Solution Approach 1:
The patent applies parameter changes by establishing a specific relationship between imaging parameters (imaging distance d, focal length f, F-number F#) to maintain a constant light-emitting region size S. By changing parameters while satisfying the equation S = (R/m) × (f/(F# × d)), the device achieves both versatility in imaging conditions and compatibility in measurements.
Solution Approach 2:
The patent creates equipotentiality in measurement compatibility by ensuring that the light-emitting region size remains constant across different imaging conditions. This constant size ensures that speckle contrast measurements remain comparable and compatible regardless of variations in imaging distance, focal length, or F-number.
2Reliability
If the light-emitting region size is kept constant to ensure measurement compatibility, then the reliability of speckle contrast comparison is improved, but the flexibility in choosing imaging conditions deteriorates
Solution Approach 1:
The patent resolves this contradiction by showing that multiple parameter combinations can satisfy the constant light-emitting region size equation. Users can flexibly choose different imaging conditions (distance, focal length, aperture) as long as they maintain the relationship defined by the equation, thus achieving both reliability and flexibility.
Solution Approach 2:
The patent achieves universality by creating a universal constraint equation that applies across all imaging conditions. The equation S = (R/m) × (f/(F# × d)) serves as a universal guide that allows the device to operate reliably under any imaging condition while maintaining measurement compatibility.
3Measurement precision
If the diffraction limited spot size is reduced to improve measurement precision, then the measurement precision is improved, but the light-emitting region size becomes variable across imaging conditions
Solution Approach 1:
The patent addresses this by establishing that the diffraction limited spot size R is not fixed but varies with imaging parameters. By dynamically adjusting R according to the equation while maintaining constant light-emitting region size S, the device achieves both measurement precision and size stability across different imaging conditions.
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 ensures compatibility and equivalence of speckle or sparkle contrasts under diverse imaging conditions, enhancing the versatility of the measurement device and reducing structural limitations.
Implementation Method 1
a size of a light-emitting region on the measurement surface that contributes to formation of a diffraction limited spot of the emitted light on the two-dimensional sensor array surface
Implementation Method 2
an optical system that focuses emitted light that is emitted from a measurement surface
Data Source
AI summary
An optical measurement device includes an optical system that focuses emitted light that is emitted from a measurement surface of a light emitting electronic display or a light emitting surface of which a speckle contrast or a sparkle contrast is to be measured; a two-dimensional sensor array having a two-dimensional sensor array surface on which the emitted light is focused, the two-dimensional sensor array capturing an image of the emitted light; and a calculation unit that calculates the speckle contrast or the sparkle contrast based on the image of the emitted light captured under an imaging condition under which a size of a light-emitting region on the measurement surface is constant, the light-emitting region contributing to formation of a diffraction limited spot of the emitted light on the two-dimensional sensor array surface.