Abstract

A novel technique for measuring droplet temperatures has been demonstrated. Laser-induced phosphorescence from thermographic phosphors, seeded to distilled water and iso-octane, was used to measure temperatures of single falling droplets. The phosphors were excited by the fourth and third harmonics of a Nd:YAG laser. The subsequent emission was evaluated by spectral and temporal investigations of the thermographic phosphors Mg₄FGeO₆:Mn and La₂O₂S:Eu, respectively. The spectral and the temporal methods permitted temperature measurements of free-falling droplets up to 433 K. Results from both methods, which show an estimated accuracy of better than 1%, are presented.

© 2004 Optical Society of America

Gas phase thermometry of hot turbulent jets using laser induced phosphorescence

Martin Lawrence, Hua Zhao, and Lionel Ganippa
Opt. Express 21(10) 12260-12281 (2013)

Thermometry in aqueous solutions and sprays using two-color LIF and structured illumination

Yogeshwar Nath Mishra, Fahed Abou Nada, Stephanie Polster, Elias Kristensson, and Edouard Berrocal
Opt. Express 24(5) 4949-4963 (2016)

Simultaneous temperature, mixture fraction and velocity imaging in turbulent flows using thermographic phosphor tracer particles

Benoit Fond, Christopher Abram, Andrew L Heyes, Andreas M Kempf, and Frank Beyrau
Opt. Express 20(20) 22118-22133 (2012)

Temperature and size of single transparent droplets by light scattering in the forward and rainbow regions

P. Massoli, F. Beretta, A. D’Alessio, and M. Lazzaro
Appl. Opt. 32(18) 3295-3301 (1993)

Surface temperature measurement of cooling and heating droplets by rainbow refractometry

Qimeng Lv, Yingchun Wu, and Xuecheng Wu
Appl. Opt. 61(25) 7455-7462 (2022)