Spectral Measurement Device Dynamic Light Reduction
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Solution Overview
Problem
Current spectroscopic measurement devices face challenges in accurately measuring light emitted from biological components over a wide range, leading to saturation issues due to a fixed amplification factor, which affects the detection of small changes in glucose and cholesterol concentrations.
Innovation Solution
The device employs a light reducing device with a dark filter having regions of different transmittances, allowing interference lights of varying intensities to be detected, enabling the acquisition of interferograms and spectra from optimal regions, thereby preventing overflow and improving measurement accuracy across a wide range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the amplification factor is increased to improve detection sensitivity for small changes in biological component concentrations, then measurement precision is improved, but the A/D converter input range is exceeded causing overflow and saturation
Solution Approach 1:
The patent applies dynamics by making the amplification factor variable rather than fixed. The amplification factor is dynamically adjusted based on the intensity of the input light signal - higher amplification for weak signals and lower amplification for strong signals. This dynamic adjustment prevents overflow while maintaining detection sensitivity across varying light intensities from biological components.
Solution Approach 2:
The patent changes the parameter of amplification factor from a constant value to a variable value that adapts to different light intensities. By modifying this key parameter based on signal strength, the system achieves both high measurement precision for small concentration changes and prevents saturation, resolving the technical contradiction between sensitivity and reliability.
2Device complexity
If a fixed amplification factor is used to simplify the measurement system, then device complexity is reduced, but the measurement range is limited and cannot accommodate varying light intensities
Solution Approach 1:
The system transitions from a static amplification factor to a dynamic one that automatically adjusts based on light intensity. This dynamic control expands the measurement range to handle both weak and strong signals while maintaining relatively simple system architecture through automated adjustment rather than multiple manual settings.
Solution Approach 2:
The measurement system performs self-adjustment of the amplification factor based on the detected light intensity. The system automatically selects appropriate amplification levels without requiring external intervention or complex manual configuration, thereby expanding adaptability while keeping the control mechanism relatively simple through self-service operation.
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 configuration achieves a dynamic range for spectroscopic measurements, preventing A/D converter overflow and enabling accurate detection of glucose and cholesterol concentrations, regardless of light intensity, thereby enhancing measurement sensitivity and precision.
Implementation Method 1
object beams reflected from the two mirror units interfere with each other on an imaging plane
Implementation Method 2
The movable mirror unit is moved by a piezo element or the like, and a phase shift according to the moving distance of the movable mirror unit is given to the object beams
Implementation Method 3
a light reducing device which has a dark filter including a plurality of regions having different transmittances
Data Source
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AI summary
A spectral characteristics measurement device according to the present invention includes: an incident optical system that causes measurement light emitted from each of a plurality of measurement points inside of an object to be measured to enter a reflection surface of a fixed reflection unit and a reflection surface of a movable reflection unit; an imaging optical system that introduces fixed reflected measurement light reflected by the reflection surface of the fixed reflection unit and movable reflected measurement light reflected by the reflection surface of the movable reflection unit to the same point and forms interference light of the two reflected measurement lights; a light detection unit including a plurality of pixels for detecting an intensity of the interference light; a transmission filter that is arranged on an optical path between the imaging optical system and the light detection unit and includes a plurality of regions having different transmittances, the filter being configured such that the fixed reflected measurement light and the movable reflected measurement light that form the interference light that enters each pixel of the light detection unit are transmitted through the same region; and an arithmetic processing unit that obtains an interferogram of the measurement light from a detection signal of each pixel of the light detection unit when the movable reflection unit is moved, and obtains a spectrum of the measurement light based on the interferogram.