Laser Doppler Flowmeter Calculation Selection for Precision
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Solution Overview
Problem
Laser Doppler flowmetry has limited versatility due to variations in measurement systems, making it challenging to obtain accurate flow rate measurements across different setups, as the degree of wavelength shift caused by the Doppler effect is influenced by fluid properties and measurement environment factors.
Innovation Solution
The measurement system performs multiple types of calculations on light reception signals from scattered light and selects the appropriate calculation based on measurement conditions, using a calculation determination unit to identify the best regression equation for converting flow rate equivalent values to actual flow rates, enhancing versatility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single calculation method is used for flow rate measurement, then the measurement process is simple, but the measurement precision deteriorates due to variations in measurement systems and fluid properties
Solution Approach 1:
The patent applies parameter changes by performing multiple types of calculations (first, second, and third calculations) with different mathematical approaches on the light reception signal. Each calculation method uses different parameters and formulas to compute flow rate equivalent values, allowing the system to adapt to variations in measurement conditions and fluid properties, thereby improving measurement precision without significantly increasing system complexity
Solution Approach 2:
The patent implements universality by creating a multi-functional calculation system that can perform multiple types of calculations depending on the measurement conditions. The calculation determination unit selects the appropriate calculation method based on the specific situation, making the measurement system universally applicable to various fluid types and measurement scenarios while maintaining simplicity through automated selection
2Measurement precision
If multiple calculation methods are implemented to improve measurement accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent applies self-service by implementing an automated calculation determination unit that automatically selects the appropriate calculation method based on the measurement conditions and fluid properties. The system serves itself by autonomously determining which calculation approach (first, second, or third calculation) is most suitable, eliminating the need for manual intervention and reducing the operational complexity despite having multiple calculation methods available
Solution Approach 2:
The patent implements dynamics by making the calculation system adaptive and flexible. The calculation determination unit dynamically selects the appropriate calculation method based on real-time measurement conditions, fluid properties, and measurement environment factors. This dynamic approach allows the system to optimize measurement precision for each specific situation without requiring a fixed complex structure
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 accurate and versatile flow rate measurements across various systems by determining the optimal calculation and regression equation, reducing errors and improving the system's ability to handle different measurement targets.
Implementation Method 1
information based on a beat signal generated due to the Doppler shift of light
Data Source
AI summary
A measurement system according to an aspect of the present disclosure is a measurement system that measures a degree of motion of a moving measurement target. In the measurement system, a calculation unit performs M (M is an integer of 2 or more) types of calculation with respect to a light reception signal generated by receiving scattered light from the measurement target, in order to calculate M calculation values. A calculation determination unit determines, based on M×N of the calculation values obtained by performing N (N is an integer of 2 or more) measurements and based on N standard values corresponding to the N measurements, a calculation to be employed.