Fluid Measurement Device Using Doppler Shift Analysis
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Solution Overview
Problem
Conventional fluid measurement technologies face challenges in accurately measuring flow rates and velocities under various conditions, particularly in fluids that scatter light, and often require knowledge of the cross-sectional area of the flow channel, leading to reduced measurement accuracy and convenience.
Innovation Solution
A fluid measurement apparatus utilizing the Doppler effect on light, which includes an optical emitter and detector to calculate flow states by analyzing the frequency shift of scattered light, allowing for non-invasive and accurate estimation of flow rates and velocities without requiring information about the flow channel's cross-sectional area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical measurement methods are used to measure flow rate, then measurement can be performed, but measurement accuracy deteriorates in fluids that scatter light
Solution Approach 1:
The invention converts the harmful light scattering effect into a beneficial measurement mechanism by using the Doppler shift of scattered light. Instead of treating scattered light as noise to be eliminated, the patent utilizes the frequency shift caused by particle motion in scattered light to determine flow velocity, thereby transforming the scattering interference into a useful measurement signal.
Solution Approach 2:
The invention replaces conventional mechanical or direct optical blockage-based flow measurement methods with optical Doppler effect-based measurement. By using the frequency shift of light scattered by moving particles, the system achieves non-contact, non-invasive flow measurement that is insensitive to the optical properties of the fluid.
2Ease of operation
If conventional flow measurement methods are used, then flow rate can be measured, but knowledge of cross-sectional area is required, reducing convenience
Solution Approach 1:
The measurement system performs self-calibration by automatically determining the relationship between optical signal characteristics and flow rate without requiring external input of cross-sectional area information. The system uses the detected Doppler shift spectrum to directly calculate flow velocity, and the flow rate is derived from velocity and power relationships inherent in the optical measurement, eliminating the need for separate geometric measurements.
3Measurement precision
If conventional optical measurement is used, then measurement can be performed, but noise interference increases, reducing measurement accuracy
Solution Approach 1:
The invention extracts the useful Doppler shift signal from the noisy scattered light background by using spectral analysis. The system separates the frequency-shifted scattered light components corresponding to particle motion from the unshifted or differently shifted background light, effectively filtering out noise through frequency domain separation rather than requiring physical filtering or complex noise cancellation.
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
The apparatus improves measurement accuracy and convenience by reducing noise interference and enabling accurate flow state estimation across a wider range of conditions, including fluids with scattering substances, and allows for non-invasive measurements.
Implementation Method 1
A fluid measurement apparatus capable of calculating a flow state of a measurement target fluid by utilizing the Doppler effect on light
Implementation Method 2
Light radiated to an irradiation target including a measurement target fluid is scattered by the fluid, and its frequency is shifted (Doppler shift) due to the Doppler effect, in accordance with the flow state of the fluid
Data Source
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AI summary
A fluid measurement apparatus according to an embodiment includes an optical emitter capable of radiating light to an irradiation target including a fluid, an optical detector capable of receiving scattered light scattered by the fluid, and a controller that includes a generator configured to generate a frequency spectrum based on the scattered light and an estimation unit configured to estimate a flow state of the fluid, based on a characteristic component of the frequency spectrum. The controller causes the generator to generate a first frequency spectrum based on a measurement target fluid and a second frequency spectrum based on the fluid in a known flow state, and then causes the estimation unit to compare a characteristic component of the first spectrum and a characteristic component of the second frequency spectrum, whereby the controller can estimate a flow state of the measurement target fluid.