Research on simultaneous temperature and relative humidity measurement based on tapered PCF Mach-Zehnder interferometer

Zhang, Jietong; Tong, Zhengrong; Zhang, Weihua; Zhao, Yang; Li, Jiaxin

doi:10.1016/j.yofte.2020.102408

Cited by 9 publications

(2 citation statements)

References 27 publications

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“…In 2020, Chunmei et al proposed a sensing structure based on a Fabry-Perot cavity (FPC) and Sagnac loops for measurement of temperature and strain, the FPC consists of a micropiece of chemical etched multimode fiber end face, welded with another single mode fiber [10]. In 2021, Jietong et al fabricated the MZI based on tapered PCF which was sandwiched between two SMFS for simultaneous temperature and relative humidity (RH) [11]. In 2021, Xun et al presented a hybrid sapphire dual-Fabry-Perot cavities sensor using a double-sided polished sapphire solid wafer in series with a double-sided parallel sapphire C-ring and a single-sided polished sapphire mirror to form the hybrid Fabry-Perot interferometer for high temperature and RI measurement [12].…”

Section: Introductionmentioning

confidence: 99%

“…, respectively. According to equation(10), wavelength drift can be expressed in matrix form as:In equation(11), the first item on the right side of the equation is called the sensitivity matrix K and simplified to obtain the change value of temperature and strain as follows: is the characteristic equation of the sensor, where K −1 is the inverse matrix of the sensitivity matrix K, as shown in equation(13).…”

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confidence: 99%

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High temperature and strain dual-parameters fiber sensing based on intermodal interference and femtosecond laser fabricated fiber Bragg grating

Li¹,

He²,

Tan³

et al. 2023

Phys. Scr.

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In this paper, the sensor was proposed by combination of grapefruit photonic crystal fiber (GPCF) and femtosecond laser fabricated fiber Bragg grating (FBG) based on Sagnac interferometer. The GPCF was sandwiched between two single-mode fibers (SMFS) to form a SMF-GPCF-SMF structure, which was based on intermodal interference. The FBG with a central wavelength of 1535.32 nm was inscribed through polyimide coating and cladding by the femtosecond laser point-by-point inscribing method. The spectrum drift data of sensing structure were collected and the dual-parameters matrix of temperature-strain was constructed to realize the simultaneous measurement of temperature and strain. The experimental results showed that the linear range of the strain measurement was from 0 με to 2,000 με at different temperature, the wavelength of FBG and GPCF was red drift and blue drift, respectively, the average strain sensitivity at different temperature was 1.25 pm/με and -2.05 pm/με, all the linearity R2 are higher than 0.999, and has the high repeatability. The linear range of temperature measurement was from 20 ℃ to 450 ℃, the wavelength of FBG and GPCF was red drift and blue drift, respectively, the temperature sensitivity of FBG and GPCF was 15.17 pm/℃ and -8.87 pm/℃, the linearity was 0.99983 and 0.99989, respectively.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%