Partially Coherent Light Processing Apparatus for Surface Layer Detection
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Solution Overview
Problem
Conventional techniques for acquiring dynamic information from body tissues using partially coherent light struggle to accurately extract interference components due to interference patterns caused by light scattered from deep tissue layers, which interfere with surface layer movements, such as ciliary motion and blood flow, leading to noise and reduced accuracy in detection.
Innovation Solution
A processing apparatus that emits partially coherent light with a coherence length equal to or greater than the inverse of the scattering coefficient but shorter than half the inverse of the reduced scattering coefficient of the body tissue, allowing for the extraction of interference components by excluding noninterference components from the scattered and returned light, thereby isolating signals from the surface layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional techniques use partially coherent light to detect body tissue, then dynamic information can be acquired, but interference patterns from deep tissue layers cause noise and reduce detection accuracy
Solution Approach 1:
The patent changes the coherence length parameter of the light source to a specific range (equal to or greater than the inverse of the scattering coefficient but shorter than half the inverse of the reduced scattering coefficient). This parameter optimization allows interference components to be generated only from the surface layer while preventing interference patterns from deep tissue layers, thereby resolving the contradiction between acquiring dynamic information and eliminating detection noise
Solution Approach 2:
The patent creates local quality differentiation in the light-tissue interaction by controlling the coherence length to generate interference components only in the surface layer region. This spatial localization of interference component generation ensures that surface layer movements can be detected without contamination from deep tissue interference patterns
2Illumination intensity
If light coherence length is increased to improve interference component generation, then surface layer signal strength increases, but interference patterns from deep tissue layers also increase causing noise
Solution Approach 1:
The patent optimizes the coherence length parameter to a precise range that balances two competing requirements: it is long enough to generate sufficient interference component intensity from the surface layer, but short enough to prevent interference patterns from forming in deep tissue layers. This parameter optimization simultaneously achieves strong surface layer signals while eliminating deep tissue noise
Solution Approach 2:
The patent applies partial action by using a coherence length that is sufficient to generate interference components in the surface layer but deliberately limited to prevent excessive penetration depth. This partial coherence length ensures that interference components are generated only where needed (surface layer) without the excessive action that would create deep tissue interference patterns
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 accurate detection of interference components from the surface layer of body tissues, reducing noise from deep tissue scattering and improving the resolution of dynamic information like ciliary motion and blood flow.
Implementation Method 1
a light source unit configured to emit partially coherent light having a coherence length that is equal to or more than inverse of a scattering coefficient of a light scattering body
Implementation Method 2
an interference component extracting unit configured to extract an interference component by excluding a noninterference component from the signal of the scattered and returned light
Data Source
AI summary
A processing apparatus includes: a light source unit configured to emit partially coherent light having a coherence length that is equal to or more than inverse of a scattering coefficient of a light scattering body and shorter than half of inverse of a reduced scattering coefficient of the light scattering body; an illumination unit configured to irradiate an illumination area on a surface of the light scattering body, with the partially coherent light emitted from the light source unit; a detection unit configured to detect, in a detection area including the illumination area, a signal of scattered and returned light from the light scattering body; and an interference component extracting unit configured to extract an interference component by excluding a noninterference component from the signal of the scattered and returned light detected by the detection unit.