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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.


Relationship between the received optical power and the cantilever deflection.
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f7: Relationship between the received optical power and the cantilever deflection.

Mentions: As shown in Fig. 7, relationship between the received optical power (PRe) of the collimator and the cantilever deflection (ΔX) was obtained by using Eqs 1 and 2, and it was measured by precise tuning the adjuster-screw of the tandem rod. It can be seen that a deflection range between 0.01 mm and 0.035 mm can be obtained, which corresponds to a strain detection-range of 1.1 × 103 με with a LOb of 21.5 mm. For symmetric measurement of both tensile and compressive strain, a static working-point with an off-set deflection of 0.025 mm and a corresponding off-set optical power of −12.3 dBm was chose (Fig. 7).


A high sensitive fiber-optic strain sensor with tunable temperature sensitivity for temperature-compensation measurement
Relationship between the received optical power and the cantilever deflection.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f7: Relationship between the received optical power and the cantilever deflection.
Mentions: As shown in Fig. 7, relationship between the received optical power (PRe) of the collimator and the cantilever deflection (ΔX) was obtained by using Eqs 1 and 2, and it was measured by precise tuning the adjuster-screw of the tandem rod. It can be seen that a deflection range between 0.01 mm and 0.035 mm can be obtained, which corresponds to a strain detection-range of 1.1 × 103 με with a LOb of 21.5 mm. For symmetric measurement of both tensile and compressive strain, a static working-point with an off-set deflection of 0.025 mm and a corresponding off-set optical power of −12.3 dBm was chose (Fig. 7).

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.