Abstract
An intensive temperature sensor based on a liquid-core optical fiber has been demonstrated for the measuring the temperature of the environment. The core of fiber is filled with a mixture of toluene and chloroform in order to make the refractive index of the liquid-core and the cladding of the fiber close. The experiment shows that a temperature sensitivity of about 5 dB/K and a tunable temperature range (from 20 oC to 60 oC) can be achieved. Based on the dielectric-clad liquid core fiber model, a simulation was carried out and the calculated results were in good accord with the experimental measurement.
Highlights
Fiber-optical sensors have been developed in a lot of fields for many decades
We present a new kind of temperature sensor based on the intensity-modulated principle
As the temperature is increased, the refractive index of the mixture decreased in a near linear fashion
Summary
Fiber-optical sensors have been developed in a lot of fields for many decades. They were widely used in the measurement for temperature, strain, voltage, electric current, vibration and so on [1,2,3,4,5,6,7,8,9]. Of all these sensors, intensity-modulated fiber-optic sensors usually combine the lowest cost with the simplest structure. The sensitivity is low (about 7×10-3 dB/°C) at room temperature, which is hard to detect
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