Sensors and Materials

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pp. 1049-1053
S&M1397
http://dx.doi.org/10.18494/SAM.2017.1567
Online Published: July 26, 2017

Development and comparison of fiber-optic water temperature sensors with different sized metal caps

Rinah Kim, Han Young Joo, and Joo Hyun Moon

(Received April 1, 2016; Accepted March 10, 2017)

Keywords: fiber-optic temperature sensor, sensing probe, metal cap, infrared optical fiber

In this study, we developed a contact-type fiber-optic temperature sensor (CFOTS) for remote and real-time measurements of water temperature. The CFOTS consisted of a sensing probe, a transmitting infrared (IR) optical fiber, a light measuring device, and a laptop. The transmitting IR optical fiber was a polycrystalline infrared (PIR) fiber based on silver halides (AgCl:AgBr). The light-measuring device was a thermopile-type photodiode detector module. The sensing probes were metal caps fabricated from metals of high thermal conductivity: copper and aluminum. Several metal caps of different materials and different inner diameters (1.5, 2.5, and 3.5 mm) were prepared and characterized to identify the optimal material and size of the sensing probe in terms of its detection performance. The CFOTS measured the water temperature of a sample in an oil bath over a range of 30–70 °C. The experimental results showed that the copper metal cap with an inner diameter of 3.5 mm was the best water temperature sensor.

Corresponding author: Joo Hyun Moon

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