An optical fiber sensing technique for temperature distribution measurements in microwave heating

作者：Wada Daichi^*; Sugiyama Jun ichi; Zushi Hiroaki; Murayama Hideaki

来源：Measurement Science and Technology, 2015, 26(8): 085105.

DOI：10.1088/0957-0233/26/8/085105

• fiber Bragg grating
• fiber optic
• infrared
• microwaves
• temperature distribution measurement

We introduce an optical fiber sensing technique that can measure the temperature distributions along a fiber during microwave heating. We used a long-length fiber Bragg grating (FBG) as an electromagnetic- immune sensor and interrogated temperature distributions along the FBG by an optical frequency domain reflectometry. Water in a glass tube with a length of 820 mm was heated in a microwave oven, and its temperature distribution along the glass tube was measured using the sensing system. The temperature distribution was obtained in 5 mm intervals. Infrared radiometry was also used to compare the temperature measurement results. Time and spatial variations of the temperature distribution profiles were monitored for several microwave input powers. The results clearly depict inhomogeneous temperature profiles. The applicability and effectiveness of the optical fiber distributed measurement technique in microwave heating are demonstrated.

• 出版日期2015-8