Spectral Measurement Stray Light Correction Lookup Table

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Solution Overview

Problem

Conventional spectral characteristic measurement apparatuses face challenges in accurately and efficiently reducing the influence of stray light, which can affect measurement accuracy and require time-consuming calculations or complex apparatus configurations, limiting the ability to quickly measure spectral characteristics across the entire wavelength range.

Innovation Solution

A spectral characteristic measurement apparatus and method that includes a spectrometer and detection areas for different wavelength ranges, using a filter to cut off specific wavelengths and storing a stray light pattern to correct for stray light by adjusting its amplitude and offset based on wavelength changes, ensuring accurate measurement spectra.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional stray light correction methods are used, then measurement accuracy is improved, but measurement time increases significantly

Engineering Contradiction:

Improvestray light correction accuracyVSAvoidmeasurement time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent pre-calculates and stores correction values for stray light in a lookup table before actual measurement. During measurement, the system simply retrieves pre-computed correction data based on detected light intensity, avoiding time-consuming real-time calculations while maintaining correction accuracy

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent creates a simplified model of stray light characteristics by measuring and storing correction data in advance. This copied correction information is then applied during actual measurements, replacing complex real-time computation with efficient data retrieval and application

Inventive Principle:

Principle #26Copying

2Measurement precision

If multiple filters are used to correct stray light, then correction effectiveness is improved, but apparatus complexity increases

Engineering Contradiction:

Improvestray light correction effectivenessVSAvoidfilter configuration complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces the mechanical/optical approach of using multiple physical filters with an electronic/computational approach. The system uses a spectrometer to detect light intensity and applies software-based correction using pre-stored correction values, eliminating the need for complex filter assemblies

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the correction approach from optical parameter manipulation (using filters with specific transmission characteristics) to computational parameter adjustment. The system measures light intensity and applies correction factors stored in memory, transforming the problem from optical engineering to data processing

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If conventional stray light correction is applied, then measurement accuracy is improved, but the wavelength range detectable is reduced

Engineering Contradiction:

Improvestray light component correctionVSAvoiddetectable wavelength range

Core Design Contradiction:

Measurement precisionVSArea of stationary object

Solution Approach 1:

The patent creates a universal correction method that works across the entire detectable wavelength range of the spectrometer. By pre-calculating correction values for all wavelengths and storing them in a lookup table, the system maintains correction effectiveness without limiting the operational wavelength range

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 more accurate and rapid spectral characteristic measurements by dynamically correcting stray light patterns, reducing errors from stray light and dark current, and enabling higher precision across the detected wavelength range without the need for complex filter configurations or lengthy calculations.

Implementation Method 1

a spectrometer (typically, a diffraction grating) generally splits measured light from an illuminant or the like, which is a measurement target, into wavelength components

Methodology Applied

Scientific EffectDiffraction: Diffraction

Implementation Method 2

a filter arranged in a stage preceding the spectrometer, for cutting off the first wavelength range

Methodology Applied

Scientific EffectOptical filtering: Filter (optical)

Data Source

PatentUS9163985B2Spectral characteristic measurement apparatus and spectral characteristic measurement method

Publication Date: 2015.10.20 OTSUKA DENSHI CO LTD

AI summary

A spectral characteristic measurement apparatus includes a spectrometer for spatially dispersing incident light depending on wavelengths and a detection portion for receiving light dispersed by the spectrometer. The detection portion includes a first detection area on which a component in a first wavelength range is incident and a second detection area on which a component in a second wavelength range is incident. The apparatus includes a correction portion for correcting stray light detected by the detection portion derived from light to be measured. The correction portion corrects a stray light pattern based on a first amount of change with respect to wavelengths in the first wavelength range of the stray light pattern and a second amount of change with respect to wavelengths included in a result of detection in the first detection area of the detection portion, to calculate a stray light component derived from the light to be measured.