Temperature measurements by laser beam deflection

Pablo G. Martinez; J. Bante; Juan Jose Alvarado-Gil

doi:10.1117/12.611902

14 February 2005 Temperature measurements by laser beam deflection

Pablo G. Martinez, J. Bante, Juan Jose Alvarado-Gil

Proceedings Volume 5776, Eighth International Symposium on Laser Metrology; (2005) https://doi.org/10.1117/12.611902
Event: Eighth International Conference on Laser Metrology, 2005, Merida, Mexico

Abstract

In this work, a system to perform the measurement of small changes of temperature in solids and liquids using a laser beam deflection is presented. It consists in a tungsten lamp that illuminates a solid material enclosed in a glass container filled with distilled water; generating heating of the sample. The monitoring of the temperature was made using a probe He-Ne laser whose path is altered by the local change in the index of refraction of the water close to the surface of the sample. A four quadrants position sensor monitors the movement of the spot of the laser using a lock-in amplifier. The lamp is modulated using a power circuit driven by the same lock-in amplifier. This configuration allows the study of very small changes in temperature due to the fact that the lock-in detects at the same frequency that drives the circuit of the lamp. In order to show the potential of our system, applications in pulsed and modulated form and for the measurement of thermal diffusivity are presented. The advantages and limitations as well as the possible improvements of our system are discussed.

Citation Download Citation

Pablo G. Martinez, J. Bante, and Juan Jose Alvarado-Gil "Temperature measurements by laser beam deflection", Proc. SPIE 5776, Eighth International Symposium on Laser Metrology, (14 February 2005); https://doi.org/10.1117/12.611902

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