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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.


Measured temperature sensitivity of the FOS sensor with (a) PMMA nut, (b) Al nut, and (c) quartz nut.
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f8: Measured temperature sensitivity of the FOS sensor with (a) PMMA nut, (b) Al nut, and (c) quartz nut.

Mentions: Figure 8 shows the measured temperature sensitivity of the FOS sensor. According to Eqs 3 and 4, the temperature sensitivity can be tuned by changing the length ratio of the sleeve-nut and the adjustable-screw. With a fixed length of the tandem rod (LRod = LNut + LScrew = 13.6 mm), the temperature sensitivity is −0.15 and −0.07 dB/°C for 6 mm and 5 mm long PMMA nut (Fig. 8(a)), is −0.03, 0.0008 and 0.04 dB/°C for 11.0 mm, 6.5 mm and 2.0 mm long Al nut (Fig. 8(b)), and is 0.12 and 0.19 dB/°C for 2 mm and 7 mm long quartz nut (Fig. 8(c)), respectively.


A high sensitive fiber-optic strain sensor with tunable temperature sensitivity for temperature-compensation measurement
Measured temperature sensitivity of the FOS sensor with (a) PMMA nut, (b) Al nut, and (c) quartz nut.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f8: Measured temperature sensitivity of the FOS sensor with (a) PMMA nut, (b) Al nut, and (c) quartz nut.
Mentions: Figure 8 shows the measured temperature sensitivity of the FOS sensor. According to Eqs 3 and 4, the temperature sensitivity can be tuned by changing the length ratio of the sleeve-nut and the adjustable-screw. With a fixed length of the tandem rod (LRod = LNut + LScrew = 13.6 mm), the temperature sensitivity is −0.15 and −0.07 dB/°C for 6 mm and 5 mm long PMMA nut (Fig. 8(a)), is −0.03, 0.0008 and 0.04 dB/°C for 11.0 mm, 6.5 mm and 2.0 mm long Al nut (Fig. 8(b)), and is 0.12 and 0.19 dB/°C for 2 mm and 7 mm long quartz nut (Fig. 8(c)), respectively.

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.