Optical Sensor Non-Parallel Light Beam Ratio Estimation

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Solution Overview

Problem

Existing methods for measuring optical properties are complex and require special devices like integrating spheres, and are prone to instability due to variations in the arrangement and installation conditions of light source and detection modules.

Innovation Solution

An optical sensor that emits non-parallel light beams from multiple directions and uses a light detector to calculate the ratio of light amounts in different directions, comparing these ratios to pre-calculated models to estimate optical properties, thereby reducing the impact of module arrangement and installation conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If an integrating sphere is used to measure optical properties, then measurement precision is improved, but device complexity increases

Engineering Contradiction:
Improveoptical property measurement precisionVSAvoiddevice complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent uses pre-calculated simulation results as a virtual model (copy) of the complex integrating sphere measurement process. Instead of physically using an integrating sphere, the system creates a digital twin through Monte Carlo simulations that replicate the optical measurement process, allowing accurate optical property estimation without the complex physical device.

Inventive Principle:
Principle #26Copying

Solution Approach 2:

The patent replaces the mechanical/optical complex system (integrating sphere) with a computational system. By substituting the physical integrating sphere with computer-based Monte Carlo simulations and light transport modeling, the system achieves the same measurement precision while eliminating the need for complex mechanical and optical components.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If the distance between light source module and light detection module is changed to obtain optical properties, then adaptability is improved, but measurement stability deteriorates due to arrangement and installation conditions

Engineering Contradiction:
Improvemeasurement configuration flexibilityVSAvoidmeasurement stability
Core Design Contradiction:
Adaptability or versatilityVSReliability

Solution Approach 1:

The patent performs light transport simulations and pre-calculates the relationship between light source-detector distances and detected light amounts before actual measurements. By pre-establishing the expected light intensity patterns for various distances and configurations, the system can directly compare measured values against these pre-computed references, eliminating the need to physically adjust distances during measurement and thus maintaining stability.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent changes the approach from physically varying distance parameters to computationally varying simulation parameters. Instead of mechanically adjusting the distance between light source and detector modules, the system uses parameter changes in the Monte Carlo simulation to model different distance scenarios, then matches the actual measurement to the appropriate simulated scenario, maintaining measurement stability while preserving adaptability.

Inventive Principle:
Principle #35Parameter changes

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 allows for stable and accurate measurement of optical properties without the need for special devices, simplifying the measurement process and reducing variations associated with module placement.

Implementation Method 1

a light detector configured to detect a plurality of light beams that have been reflected within the object and have returned to the surface from a plurality of directions

Methodology Applied
Scientific EffectLight reflection: Reflection

Data Source

PatentUS10768095B2Optical sensor
Publication Date: 2020.09.08 RICOH CO LTD
  • US10768095B2 patent drawing
  • US10768095B2 patent drawing
  • US10768095B2 patent drawing

AI summary

An optical sensor includes a light emitter configured to irradiate a surface of an object with a plurality of non-parallel light beams, a light detector configured to detect a plurality of light beams that have been reflected within the object and have returned to the surface from a plurality of directions, a recording unit configured to store pre-calculated results of a plurality of models having different optical properties and physical structures, and a calculating unit configured to calculate a light amount ratio of the plurality of reflected light beams, and estimate an optical property of the object based on the calculated light amount ratio and the pre-calculated results.