Adaptive Laser Power Control for Fluid Flow Measurement
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Solution Overview
Problem
Existing measuring apparatuses face challenges in maintaining accurate measurements when the flow velocity of a fluid changes during measurement, as they often apply high laser light power regardless of fluid flow velocity, potentially applying excessive energy to the fluid.
Innovation Solution
A measuring apparatus with a controlling device that adjusts the light intensity or stops irradiation based on fluid flow velocity information, using a dimming device or threshold values to optimize light application and prevent excessive energy application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser light power is increased to improve signal to noise ratio, then measurement accuracy is improved, but excessive energy is applied to the fluid when flow velocity decreases
Solution Approach 1:
The laser light power is made dynamically adjustable based on real-time fluid flow velocity measurements. The controlling device modifies the irradiation intensity according to the detected flow conditions, transitioning from a static high-power mode to a dynamic adaptive power level that matches the actual measurement needs.
Solution Approach 2:
A feedback loop is established where the flow velocity measurement results are fed back to the controlling device, which then adjusts the laser light power accordingly. This closed-loop control ensures that the irradiation intensity is continuously optimized based on the actual fluid flow conditions.
2Reliability
If high laser light power is applied continuously, then measurement signal quality is maintained, but energy waste occurs when fluid flow velocity is low
Solution Approach 1:
The laser light power parameter is changed dynamically based on fluid flow velocity thresholds. When flow velocity exceeds a predetermined threshold, high power is maintained for reliable measurement; when flow velocity drops below the threshold, power is reduced to minimize energy waste while maintaining sufficient signal quality.
3Measurement precision
If laser irradiation is maintained at high power, then measurement accuracy is preserved, but fluid damage risk increases when flow velocity decreases
Solution Approach 1:
The system dynamically adjusts laser power levels based on real-time flow velocity detection, transitioning from static high-power irradiation to adaptive power control that preserves measurement accuracy while preventing fluid damage under low-flow conditions.
Solution Approach 2:
The controlling device takes preliminary protective action by reducing laser power before potential fluid damage can occur. When flow velocity drops below the threshold, the system proactively lowers irradiation intensity to prevent thermal or photonic damage to the fluid or measurement target.
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 and efficient measurement by adjusting light intensity according to fluid flow velocity, preventing excessive energy application and maintaining measurement accuracy across varying flow velocities.
Implementation Method 1
a first light receiving device configured to receive light scattered by the fluid, out of the light applied by the first irradiating device
Implementation Method 2
configured to correct a blood flow volume, which is calculated from a Doppler shift of the laser light
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A measuring apparatus is provided with: an irradiating device configured to apply light to a fluid; a light receiving device configured to receive light scattered by the fluid; an obtaining device configured to obtain fluid information, which indicates a flow volume or a flow velocity of the fluid; and a controlling device configured or programmed to control the irradiating device, on the basis of the fluid information.