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A high sensitive fiber-optic strain sensor with tunable temperature sensitivity for temperature-compensation measurement

View Article: PubMed Central - PubMed

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.

No MeSH data available.


The optical photograph of the tandem rod.
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f3: The optical photograph of the tandem rod.

Mentions: As shown in Fig. 1 and Fig. 2, The FOS sensor consists of an elastic cantilever (a 15 mm long and 0.4 mm thick spring-steel slice with one polished surface for reflecting light beam), a tandem rod and an optical fiber collimator (with a diameter of 3 mm and a working distance of 8 mm). As shown in Fig. 3, the tandem rod is constructed by a stainless-steel adjuster-screw and a sleeve-nut (made from Al, PMMA, or quartz). The screw is fixed inside the nut, and its length outside the nut can be precisely tuned. Thus, TECRod can be tuned between the TECs of screw (stainless-steel) and nut (such as Al, PMMA or quartz).


A high sensitive fiber-optic strain sensor with tunable temperature sensitivity for temperature-compensation measurement
The optical photograph of the tandem rod.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5304330&req=5

f3: The optical photograph of the tandem rod.
Mentions: As shown in Fig. 1 and Fig. 2, The FOS sensor consists of an elastic cantilever (a 15 mm long and 0.4 mm thick spring-steel slice with one polished surface for reflecting light beam), a tandem rod and an optical fiber collimator (with a diameter of 3 mm and a working distance of 8 mm). As shown in Fig. 3, the tandem rod is constructed by a stainless-steel adjuster-screw and a sleeve-nut (made from Al, PMMA, or quartz). The screw is fixed inside the nut, and its length outside the nut can be precisely tuned. Thus, TECRod can be tuned between the TECs of screw (stainless-steel) and nut (such as Al, PMMA or quartz).

View Article: PubMed Central - PubMed

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.

No MeSH data available.