Phosphorescent Particle Tracking for Flow-Field Velocity and Temperature
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Solution Overview
Problem
Existing technologies for simultaneous measurement of flow-field velocity and temperature suffer from limited measurement range and large errors in velocity and temperature measurement.
Innovation Solution
A method and apparatus utilizing temperature-sensitive phosphorescent particles with a phosphorescence decay process, combined with particle tracking velocimetry and thermal imaging, to determine flow-field velocity and temperature through continuous multi-frame sampling and gray-level analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing methods for simultaneous measurement of flow-field velocity and temperature are used, then measurement can be performed, but measurement precision is poor with large errors
Solution Approach 1:
The measurement process is segmented into distinct phases: particle injection, phosphorescence excitation, multi-frame image capture during decay, and separate analysis of velocity (from particle position) and temperature (from gray-level decay). This segmentation allows optimized measurement of each parameter independently, improving overall precision while reducing相互 interference errors
Solution Approach 2:
Phosphorescent particles are pre-injected into the flow field before measurement begins. The particles are excited by a laser pulse to initiate phosphorescence decay, and multi-frame images are captured in advance during the decay process. This preliminary preparation ensures that both velocity and temperature data are available simultaneously from the same particle trajectories, improving measurement reliability
Solution Approach 3:
Temperature-sensitive phosphorescent particles serve as intermediaries that carry both velocity information (through their motion trajectories) and temperature information (through their phosphorescence decay characteristics). These particles mediate between the flow field and measurement system, enabling simultaneous non-contact measurement of both parameters with high precision
2Adaptability or versatility
If existing simultaneous measurement methods are used, then velocity and temperature can be measured, but measurement range is limited
Solution Approach 1:
The system uses dynamic multi-frame image capture during the phosphorescence decay process, adapting the measurement window to the actual decay characteristics of the particles. This dynamic approach allows the system to adjust to different flow conditions and particle types, expanding measurement range while maintaining precision through real-time optimization of the capture sequence
Solution Approach 2:
The measurement system exploits changes in phosphorescence decay parameters (gray-level intensity over time) as a function of temperature. By monitoring how the decay rate changes with temperature, the system can measure a wide temperature range. Similarly, particle trajectory analysis adapts to different velocity ranges, enabling versatile measurement across diverse flow conditions without sacrificing accuracy
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 non-contact, instantaneous, and high-resolution simultaneous measurement of flow-field velocity and temperature with improved accuracy and a larger measurement range, avoiding interference and noise-related errors.
Implementation Method 1
particle timing frame images are images obtained by performing continuous multi-frame sampling for a phosphorescence decay process of the target temperature-sensitive phosphorescent particle
Implementation Method 2
determining a motion trajectory and a gray-level change of a target temperature-sensitive phosphorescent particle in particle timing frame images
Data Source
AI summary
The present application provides a method and apparatus for simultaneous measurement of flow-field velocity and temperature, and a storage medium. The method includes: determining a motion trajectory and a gray-level change of a target temperature-sensitive phosphorescent particle in particle timing frame images; determining a velocity of the target temperature-sensitive phosphorescent particle based on the motion trajectory of the target temperature-sensitive phosphorescent particle in the particle timing frame images; determining a decay-slope constant of the target temperature-sensitive phosphorescent particle based on the gray-level change of the target temperature-sensitive phosphorescent particle in the particle timing frame images; determining a temperature of the target temperature-sensitive phosphorescent particle based on the decay-slope constant of the target temperature-sensitive phosphorescent particle and a preset correspondence; and determining a velocity and a temperature of a flow field to be measured based on the velocity and the temperature of the target temperature-sensitive phosphorescent particle.