Abstract
This paper describes the development and function of an optical fiber temperature sensor made out of a compound of epoxy and optical glass particles. Because of the different thermo-optic coefficients of these materials, this compound exhibits a strong wavelength and temperature dependent optical transmission, and it therefore can be employed for fiber optic temperature measurements. The temperature at the sensor, which is integrated into a polymer optical fiber (POF), is evaluated by the ratio of the transmitted intensity of two different light-emitting diodes (LED) with a wavelength of 460 nm and 650 nm. The material characterization and influences of different sensor lengths and two particle sizes on the measurement result are discussed. The temperature dependency of the transmission increases with smaller particles and with increasing sensor length. With glass particles with a diameter of 43 μm and a sensor length of 9.8 mm, the intensity ratio of the two LEDs decreases by 60% within a temperature change from 10°C to 40°C.
Highlights
Fiber optic temperature sensing enables monitoring in particular surroundings such as microwaves or explosion sensitivity [1,2,3,4]
This paper shows fiber optic temperature measurement with a compound comprised of glass particles and epoxy
This paper shows the implementation of a fiber optic temperature sensor based on different thermo-optic coefficients of a polymer and glass particles
Summary
Fiber optic temperature sensing enables monitoring in particular surroundings such as microwaves or explosion sensitivity [1,2,3,4]. Other sensors utilize Bragg gratings [7,8,9] or the temperature-dependent fluorescence intensity of certain materials [10] to measure the temperature. Another way is to analyze the Raman scattering in a glass fiber [11] or to analyze the temperature with a Fabry-Pérot interferometer (FPI) [12, 13] or with a Mach-Zehnder interferometer [14] integrated into an optic fiber. Most temperature sensing applications use glass fibers for information transport and measurement. The use of a polymer optical fiber (POF) has several advantages: POFs have low costs, high elastic strain limits, and high fracture toughness, [17] which enable sensing in deforming structures [18] amongst others
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