Schlieren technique to visualize the temperature gradient around an optical fiber tip

A. Guzmán-Barraza; N. I. Toto-Arellano; J. G. Ortega-Mendoza; A. Martínez González

doi:10.1117/12.2594945

7 September 2021 Schlieren technique to visualize the temperature gradient around an optical fiber tip

A. Guzmán-Barraza, N. I. Toto-Arellano, J. G. Ortega-Mendoza, A. Martínez González

Proceedings Volume 11815, Novel Optical Systems, Methods, and Applications XXIV; 118150T (2021) https://doi.org/10.1117/12.2594945
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Conference Poster

Abstract

In this work, an experimental analysis of the Schlieren technique is presented to get the temperature distribution that is generated around the optical fiber. Laser light (λ = 450 nm) travels through this fiber (multimode optical fiber, 105/125 μm) and on its tip contains silver nanoparticles. The thermal gradient arises from the absorption of laser radiation by the silver nanoparticles adhered on the fiber tip. Schlieren Z-type setup was used, which has of a light source, two parabolic mirrors, a knife, and the camera. The analysis of the temperature distribution was carried out by obtaining Schlieren images in air through the digital camera. As a temperature calibration factor, the boiling temperature of ethanol (78 °C) was used, that is, previously, the tip of the optical fiber was immersed in ethanol and the laser power was set to the value before the appearance of the boiling bubbles. Subsequently, the optical fiber was placed in the Schlieren arrangement, and taking the above we find that the tip of the optical fiber reaches ~ 80 °C when it is in the air, this value is approximate to the boiling temperature of ethanol, the possible cause of the temperature variation is given by the transfer of heat in and out of the ethanol.

Citation Download Citation

A. Guzmán-Barraza, N. I. Toto-Arellano, J. G. Ortega-Mendoza, and A. Martínez González "Schlieren technique to visualize the temperature gradient around an optical fiber tip", Proc. SPIE 11815, Novel Optical Systems, Methods, and Applications XXIV, 118150T (7 September 2021); https://doi.org/10.1117/12.2594945

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