Abstract
A high sensitive fiber-optic strain sensor, which consists of a cantilever, a tandem rod and a fiber collimator, was proposed. The tandem rod, which transfer the applied strain to the cantilever, was used for tuning the temperature sensitivity from −0.15 to 0.19 dB/°C via changing the length ratio of the rods. Moreover, due to the small beam divergence of the collimator, high strain sensitivity can be realized via incident-angle sensitive detection-mechanism. A strain detection-range of 1.1 × 103 με (with a sensing length of 21.5 mm), a detection limit of 5.7 × 10−3 με, and a maximum operating frequency of 1.18 KHz were demonstrated. This sensor is promising for compensating the thermal-expansion of various target objects.
Highlights
A high sensitive fiber-optic strain sensor, which consists of a cantilever, a tandem rod and a fiber collimator, was proposed
An intensity-modulation Fiber-optic strain (FOS) sensor with tunable temperature sensitivity was proposed for the first time, which consists of an elastic cantilever, a tandem rod and a fiber collimator
A high sensitive FOS sensor with tunable temperature sensitivity was proposed for the first time
Summary
It can be seen that the temperature sensitivity can be tuned in a wide range from positive to negative by increasing the TECNut (TECPMMA >TECAl >TECquartz), because larger TECNut would increase the cantilever deflection (ΔX) and result in larger coupling loss of the collimator (Fig. 1). In this case, for the target object made from joined Fe-Al plate, temperature insensitivity can be obtained with a 6.5 mm long Al nut. 3 mm (BL-5, WT&T Inc., www.wttechnology.com), is employed as micro-collimator, high temperature, compact and light weight sensor can be realized
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