Measurement of Temperatures on In-Flight Water Droplets by Laser Induced Fluorescence Thermometry

This work presents the use of laser induced fluorescence for instantaneous temperature measurements of 200 μm water droplets in a monodisperse stream while traveling downward in a standard stagnant atmosphere. The droplets are doped with small concentrations of a natural fluorescence dye (Pyrene), and with a surfactant substance, cetyldimetylbenzylammoniumchloride (CDBAC) to improve the fluorescence emission and the rate of its two band emission (excimer to monomer) is used to determine the temperature. The temperature distribution along the stream of droplets was determined for three different initial temperatures: 30°C, 40°C, and 50°C at the exit of the nozzle and it is compared very favorably with numerical results.

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Measurement of Temperatures on In-Flight Water Droplets by Laser Induced Fluorescence Thermometry

Heat Transfer: Volume 2 ◽

10.1115/ht2003-47100 ◽

2003 ◽

Author(s):

V. Salazar ◽

J. E. Gonza´lez ◽

L. A. Rivera

Keyword(s):

Temperature Distribution ◽

Fluorescence Emission ◽

Laser Induced Fluorescence ◽

Numerical Results ◽

Temperature Measurements ◽

Water Droplets ◽

Fluorescence Dye ◽

Instantaneous Temperature ◽

Natural Fluorescence ◽

Fluorescence Thermometry

This work presents the use of laser induced fluorescence for instantaneous temperature measurements of a 200μm diameter water droplets monodispersed stream traveling downward in a standard stagnant atmosphere. The droplets are doped with small concentrations of a natural fluorescence dye (Pyrene), and with a surfactant substance, cetyldimetylbenzylammoniumchloride (CDBAC) to improve the fluorescence emission. The rate of the two-band pyreme emission (excimer to monomer) is used to determine the temperature. The temperature distribution along the stream of droplets determined for different initial temperatures: (30°C, 40°C and 50°C) at the exit of the nozzle compared very favorably with numerical results.

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Development of a two-line OH-laser-induced fluorescence thermometry diagnostics strategy for gas-phase temperature measurements in engines

Applied Optics ◽

10.1364/ao.47.005871 ◽

2008 ◽

Vol 47 (31) ◽

pp. 5871 ◽

Cited By ~ 17

Author(s):

R. Devillers ◽

G. Bruneaux ◽

C. Schulz

Keyword(s):

Gas Phase ◽

Laser Induced Fluorescence ◽

Temperature Measurements ◽

Phase Temperature ◽

Fluorescence Thermometry

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Rhodamine Based Sensors for Laser Induced Fluorescence for Droplet Temperature Measurements

Volume 4 ◽

10.1115/ht-fed2004-56574 ◽

2004 ◽

Author(s):

V. Salazar ◽

J. E. Gonzalez ◽

L. Rivera ◽

L. A. Rivera

Keyword(s):

Rhodamine B ◽

Fluorescent Dyes ◽

Laser Sheet ◽

Laser Induced Fluorescence ◽

Temperature Measurements ◽

Temperature Sensitive ◽

Droplet Temperature ◽

Temperature Diagnostic ◽

Fluorescence Thermometry ◽

Spatial Temperature

Rhodamine based sensors for applications in laser induced fluorescence thermometry were tested, and optimized. Laser Induced Fluorescence (LIF) is an optical non intrusive technique for temperature measurements. The technique uses a temperature sensitive dye, which is excited by a laser sheet providing spatial temperature diagnostic. The fluorescent dyes Rhodamine B and the Rhodamine 110, were used in combination with water. Thus in the present work the main findings regarding to the sensors: RhodamineB-water, RhodamineB-ink, RhodamineB/110-water, and RhodamineB/110-ink, are reported.

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