Abstract

In this Letter, we present a particle image/tracking velocimetry (PIV/PTV) technique for simultaneous velocity measurement of both fluid and particle phases, adopting newly developed optical phase discrimination methods and novel optical particles. Spherical acrylic (PMMA) particles of diameter $\sim{\rm O}({100}\;\unicode{x00B5}{\rm m})$ were used as the particle phase, while fine ${\rm BAM}:{{\rm Eu}^{2 +}}$ phosphors of diameter $\sim{\rm O}({1}\;\unicode{x00B5}{\rm m})$ were used as the fluid tracer. Under Nd:YAG 355 nm laser excitation, both the laser-induced fluorescence (LIF) from PMMA and laser-induced phosphorescence (LIP) from ${\rm BAM}:{{\rm Eu}^{2 +}}$ provided sufficiently strong signals for PIV imaging with two non-intensified cameras and were clearly separable for phase discrimination using spectral filters and temporal profiles. The advantages of the PIV/PTV method include the relatively low cost of ${\rm BAM}:{{\rm Eu}^{2 +}}$ phosphors, high sphericity and narrow size distribution of PMMA particles with LIF emission, and direct optical discrimination eliminating artifacts, while requiring much less computational capacity for PIV/PTV processing of complex particle-laden flows.

© 2021 Optical Society of America

High-resolution velocimetry technique based on the decaying streaks of phosphor particles

Luming Fan, Patrizio Vena, Bruno Savard, Guangtao Xuan, and Benoît Fond
Opt. Lett. 46(3) 641-644 (2021)

Eu³⁺-doped Bi₂MoO₆ phosphors for highly sensitive and visible H₂S gas indicator material: optical and color properties, and gas sensing performance

Tae Wook Kang, Young Ji Park, Gyu Jin Jeong, Byungseo Bae, and Sun Woog Kim
Opt. Lett. 46(13) 3231-3234 (2021)

Structural modulation designed a thermally robust blue-cyan emitting phosphor Y₂Mg_0.8Sr_0.2 Al₄SiO₁₂:Eu²⁺ for the high color rendering index white LEDs

Huifang Yang, Panlai Li, Zejun Ye, Xiaoxue Huo, Qian Wu, Yu Wang, and Zhijun Wang
Opt. Lett. 46(22) 5639-5642 (2021)

Intense emission at ∼3.3 µm from Er³⁺-doped fluoroindate glass fiber

Huiyu He, Zhixu Jia, Tao Wang, Yasutake Ohishi, Weiping Qin, and Guanshi Qin
Opt. Lett. 46(5) 1057-1060 (2021)

Kerr-lens mode-locked Tm-doped sesquioxide ceramic laser

Yongguang Zhao, Li Wang, Weidong Chen, Pavel Loiko, Yicheng Wang, Zhongben Pan, Hanlin Yang, Wei Jing, Hui Huang, Jiachen Liu, Xavier Mateos, Zhengping Wang, Xinguang Xu, Uwe Griebner, and Valentin Petrov
Opt. Lett. 46(14) 3428-3431 (2021)