Spectrometer Correction Matrix for Variable Illumination Sources
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Solution Overview
Problem
Existing spectrometer methods require pre-determined correction values and specific components, leading to incorrect measurements when the medium or illumination light source differs, and fail to accurately produce reflection spectra, especially with unknown light sources.
Innovation Solution
A spectrometer equipped with a variable wavelength spectroscopic filter and a photosensor, which generates a correction matrix based on the inverse matrix of the spectral characteristics, allowing for real-time correction of spectral outputs without pre-prepared correction values, using only the spectrometer components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pre-determined correction values are used for spectrometer calibration, then measurement accuracy for standard media is improved, but measurement accuracy deteriorates when the medium or illumination light source differs from calibration conditions
Solution Approach 1:
The system performs preliminary measurement of the actual illumination light source spectrum and medium reflection characteristics before final spectral analysis. By measuring the illumination spectrum Li(λ) and medium reflection spectrum Rm(λ) in advance, the system calculates correction values specific to each measurement condition, enabling accurate measurements adapted to the actual environment rather than relying on fixed pre-calibrated correction values
Solution Approach 2:
The system dynamically changes correction parameters based on measured illumination conditions and medium characteristics. Instead of using fixed correction values, the system calculates correction coefficients by dividing the target reflection spectrum by the product of measured illumination spectrum and medium reflection spectrum, allowing the correction parameters to adapt to different measurement conditions
2Measurement precision
If correction values are determined for specific spectrometer components, then measurement accuracy for those components is improved, but the system becomes inapplicable when different components are used
Solution Approach 1:
The system achieves universal applicability across different spectrometer configurations by measuring actual illumination and medium characteristics rather than relying on component-specific calibration data. The correction method works with any illumination source and medium combination by dynamically measuring their spectral characteristics and calculating appropriate correction values, making the system universally applicable without requiring separate calibration for each component configuration
3Loss of time
If pre-prepared correction values are required, then initial setup time is reduced, but flexibility to handle unknown or varying illumination sources is lost
Solution Approach 1:
The system performs self-calibration by automatically measuring the illumination light source spectrum and medium reflection spectrum during operation. Instead of requiring external preparation of correction values, the system autonomously acquires measurement data and calculates correction coefficients in real-time, enabling it to handle unknown or varying illumination sources without pre-prepared correction data
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 measurement of optical spectra without pre-prepared correction values, correcting for the characteristics of the spectrometer components and medium, and effectively handling different illumination sources, providing a versatile and accurate spectral analysis.
Implementation Method 1
a variable wavelength spectroscopic filter... causing light having a first wave number from a spectroscopic light source to be incident on the variable wavelength spectroscopic filter, causing the photosensor to receive light having a second wave number and outputted from the variable wavelength spectroscopic filter
Implementation Method 2
a photosensor... causing the photosensor to receive light having a second wave number and outputted from the variable wavelength spectroscopic filter
Data Source
AI summary
A spectroscopic camera includes a spectroscopic element and a light receiver, and a method for correcting the spectroscopic camera includes causing light having a first wave number from a spectroscopic light source to be incident on the spectroscopic element, causing the light receiver to receive light having a second wave number and outputted from the spectroscopic element, generating a matrix representing the spectral characteristics of the light having the second wave number based on the output from the light receiver, and generating a correction matrix based on the inverse matrix of the matrix and storing the correction matrix in a storage section.