Scanning Mirror Delay Correction for Distortion-Free Light Measurement
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Solution Overview
Problem
Existing techniques for measuring the size and density of protein aggregates in a liquid sample are prone to measurement inaccuracies due to temperature and temporal changes affecting scanning mirrors, which are mechanical components, leading to distorted image information.
Innovation Solution
A light measurement device generates first and second image information by scanning a light spot in opposite orientations using a scanning mirror and determines a correction amount for the scanning mirror's operation delay based on these images to suppress distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If scanning mirrors are used to scan the light spot in opposite orientations, then measurement accuracy is improved, but image distortion occurs due to temperature and temporal changes in the mechanical components
Solution Approach 1:
The patent applies preliminary action by measuring the operation delay of the scanning mirror at multiple temperatures before actual measurement. The correction values are predetermined and stored in a lookup table, allowing real-time compensation without adding hardware complexity. This pre-characterization approach enables the system to account for thermal drift effects before they corrupt the measurement data.
Solution Approach 2:
The patent implements feedback by using the measured operation delay characteristics to correct the scanning mirror timing in real-time. The system continuously compensates for thermal drift by applying correction values based on the current temperature, creating a closed-loop system that maintains measurement accuracy despite environmental changes.
2Measurement precision
If angle sensors are added to correct operation delay, then measurement accuracy is improved, but device complexity and stray light increase
Solution Approach 1:
The patent replaces the mechanical/optical feedback system (angle sensors) with an electronic compensation system. Instead of using physical sensors to detect mirror position, the system uses pre-measured operation delay data and temperature compensation algorithms to correct timing electronically, eliminating the need for additional optical components.
Solution Approach 2:
The patent creates a computational model (lookup table) that copies the essential characteristics of the scanning mirror's thermal behavior. This virtual model allows the system to predict and correct operation delay without physically measuring it during operation, replacing complex hardware with simplified software-based compensation.
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 effectively suppresses image distortion caused by temperature and temporal changes without adding an optical system, ensuring accurate measurement of particle size and density.
Implementation Method 1
generates first image information and second image information of a sample by scanning a light spot of a laser beam irradiated to the sample in a first orientation and a second orientation opposite to the first orientation using a scanning mirror
Data Source
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AI summary
An object of the present invention is to provide a technique capable of suppressing distortion of image information associated with a temperature change or a temporal change of a scanning mirror without adding an optical system such as an angle sensor. A light measurement device according to the present invention generates first image information and second image information of a sample by scanning a light spot of a laser beam with respect to the sample in a first orientation and a second orientation opposite to the first orientation by a scanning mirror, and determines a correction amount for correcting an operation delay of the scanning mirror based on the first image information and the second image information (see