A precise phosphorescent-decay particle tracking method based on Gaussian intensity optimization for simultaneous temperature and velocity measurements

IF 2.5 3区工程技术 Q2 ENGINEERING, MECHANICAL

Experiments in Fluids Pub Date : 2025-08-02 DOI:10.1007/s00348-025-04081-2

Di Luan, Ruiyu Fu, Di Peng, Yingzheng Liu, Tao Cai

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引用次数: 0

Abstract

The study of heat and mass transfer in thermal fluids relies on simultaneous temperature and velocity measurement techniques, and temperature-sensitive phosphor-particle-based velocimetry is an effective tool. Among the available methods, the lifetime method performs well in simplicity and precision. However, it faces challenges when capturing the position and phosphorescence intensity of a particle as it moves and decays. A precise phosphorescent-decay particle tracking (PDPT) method based on Gaussian intensity optimization was proposed in this study for phosphorescent particles whose center positions are coupled with the phosphorescence intensity. The PDPT method precisely obtains the center positions and phosphorescence intensities of moving phosphor particles that occupy only a few pixels in a single image, thereby enhancing the accuracy of thermometry and velocimetry. Tests with numerically synthesized particles and experimental measurements were employed to validate the proposed method, which achieved a relative trajectory error of < 0.25% at a particle velocity of 200 pixel/s and a relative temperature error of < 0.05% at 473 K. Compared with existing approaches, the PDPT method showed significant improvements in the tracking ability of the center positions and intensities of individual particles, representing a notable enhancement in the simultaneous temperature and velocity measurement of thermal fluids.

Graphical abstract

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一种同时测量温度和速度的基于高斯强度优化的磷光衰变粒子精确跟踪方法

热流体中传热传质的研究依赖于温度和速度同步测量技术，而基于温度敏感磷粒子的测速技术是一种有效的工具。在现有的方法中，寿命法具有简单、精确的优点。然而，在捕捉粒子运动和衰变过程中的位置和磷光强度时，它面临着挑战。针对中心位置与磷光强度耦合的磷光粒子，提出了一种基于高斯强度优化的磷光衰变粒子精确跟踪（PDPT）方法。PDPT方法可以精确地获得单幅图像中仅占几个像素的运动磷光粒子的中心位置和磷光强度，从而提高了测温和测速的精度。通过数值合成粒子实验和实验测量验证了该方法的有效性，在粒子速度为200像素/秒时的相对轨迹误差为0.25%，在473 K时的相对温度误差为0.05%。与现有方法相比，PDPT方法对单个粒子的中心位置和强度的跟踪能力有了显著提高，在热流体的温度和速度同步测量方面有了显著增强。图形抽象

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Experiments in Fluids 工程技术-工程：机械

CiteScore

5.10

自引率

12.50%

发文量

157

审稿时长

3.8 months

期刊介绍： Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.