Four-core optical fiber as a calorimetric gauge

作者：Guvenc Sema; Gokbulut Belkis; Kosoglu Gulsen; Yuksel Heba; Inci Mehmet Naci^*

来源：Applied Optics, 2016, 55(32): 9173-9177.

DOI：10.1364/AO.55.009173

A four-core optical fiber is demonstrated as a calorimetric gauge for investigation of one-dimensional heat transfer measurements. Transient heat pulses from a Nd:YAG laser of 600 ms duration with a repetition rate of the order of 10 s are delivered onto the cleaved distal end face of the four-core fiber, aiming at one of the single cores only, which cause an optical path length difference between four guiding cores due to the temperature-induced change in the index of refraction and physical length of the targeted fiber core of concern. This results in a shift in the fringe pattern, which is operated in the reflection scheme. A phase shift of 0.43 +/- 0.015 rad is measured with a CMOS camera for 40 mW pulses. The thermal heat diffusion length in the selected fiber core is determined to be 2.8 mm, which contains 10.9 +/- 0.38 kJ/m(2)s heat, causing a temperature rise of 1.43 +/- 0.05 K.

• 出版日期2016-11-10