Abstract
The performance evaluation of a low-cost macro-bend fiber based temperature sensor is examined in this paper. The temperature sensor is based on a macro-bend singlemode fiber loop employed in a ratiometric power measurement scheme and has a linear characteristic with temperature at a fixed wavelength and bend radius. The sensor head consists of a single turn of a bare bend sensitive singlemode fiber with an applied absorption coating. The temperature of the sensor head is varied up to 75 °C and the linearity of the response is studied with different applied absorption coatings. The impact of stress on the sensor is investigated by applying external forces to the sensor and an estimation of magnitude of the stress induced variation in the ratio of the system is determined. The proposed temperature sensor, based on a macro-bend fiber, has a wide range of applications such as in composite materials processing.
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