Microwave interrogated large core fused silica fiber Michelson interferometer for strain sensing

Hua, Liwei; Yang, Song; Huang, Jie; Lan, Xinwei; Li, Yanjun; Xiao, Hai

doi:10.1364/ao.54.007181

Cited by 51 publications

(11 citation statements)

References 22 publications

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“…where is an integer and is the wavelength of the th order interference valley [7]. The distance between two adjacent minima of the spectrum, defined as the free spectrum range (FSR), can then be expressed as [8]…”

Section: Demultiplex Principlementioning

confidence: 99%

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An IFPI Temperature Sensor Fabricated in an Unstriped Optical Fiber with Self-Strain-Compensation Function

et al. 2016

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This paper describes an intrinsic Fabry-Perot interferometer (IFPI) temperature sensor with self-strain-compensation function. The sensor was fabricated on a buffer-intact optical fiber using a femtosecond (fs) laser system. The use of fs laser allows the sensor to be fabricated in an optical fiber without the necessity of removing the polymer buffer coating, thus not compromising its mechanical property. The sensor is composed of two cascaded IFPIs in different cavity length of 100 μm and 500 μm, respectively. The shorter IFPI serves as the temperature sensor, while the second IFPI serves as a compensation sensor, which is used to decouple the strain from the raw signal collected by the shorter FPI. The reflection spectrum of sensor, containing both sensory information and compensation information, is collected in wavelength domain and demultiplexed in the Fourier domain of reflection spectrum. An algorithm was developed and successfully implemented to compensate the strain influence on the proposed temperature sensor. The results showed that the proposed sensor structure holds a constant temperature sensitivity of 11.33 pm/°C when strained differently.

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Section: Demultiplex Principlementioning

confidence: 99%

“…where eff is the effective strain-optic coefficient, approximately 0.204 for fused silica material [8]. From 5, the strain sensitivity is dependent on the interrogated wavelength and the effective strain-optic coefficient [8].…”

Section: Demultiplex Principlementioning

confidence: 99%

An IFPI Temperature Sensor Fabricated in an Unstriped Optical Fiber with Self-Strain-Compensation Function

et al. 2016

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“…A simpler structure than the Mach-Zehnder interferometer is the optical fiber Michelson interferometer (OFMI), in which only one optical fiber mode coupler device is required to construct the interferometer. The OFMI as a fiber sensing device has been reported to measure refractive index [14], pressure [15], temperature [16], and strain [17] by using fiber structures based on tapered fiber, photonic crystal fiber, multicore fiber, and large core diameter fiber, respectively.…”

Section: Introductionmentioning

confidence: 99%

Adaptable Optical Fiber Displacement-Curvature Sensor Based on a Modal Michelson Interferometer with a Tapered Single Mode Fiber

Salceda-Delgado

Martı́nez-Rios

Selvas-Aguilar

et al. 2017

Sensors

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A compact, highly sensitive optical fiber displacement and curvature radius sensor is presented. The device consists of an adiabatic bi-conical fused fiber taper spliced to a single-mode fiber (SMF) segment with a flat face end. The bi-conical taper structure acts as a modal coupling device between core and cladding modes for the SMF segment. When the bi-conical taper is bent by an axial displacement, the symmetrical bi-conical shape of the tapered structure is stressed, causing a change in the refractive index profile which becomes asymmetric. As a result, the taper adiabaticity is lost, and interference between modes appears. As the bending increases, a small change in the fringe visibility and a wavelength shift on the periodical reflection spectrum of the in-fiber interferometer is produced. The displacement sensitivity and the spectral periodicity of the device can be adjusted by the proper selection of the SMF length. Sensitivities from around 1.93 to 3.4 nm/mm were obtained for SMF length between 7.5 and 12.5 cm. Both sensor interrogations, wavelength shift and visibility contrast, can be used to measure displacement and curvature radius magnitudes.

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“…Our group proposed use low coherence optical carrier based microwave interferometry (OCMI) for sensing applications 4 , and we found out that besides of the distributed sensing capability, another useful feature of OCMI Technology is that it has low dependence on multimodal interference. The concept has been demonstrated by sensing the high temperature through the sapphire fiber fabricated Michelson type-OCMI 5 , and sensing the strain through the the 200-um large core fused silica fiber fabricated Michelson type-OCMI under high temperature 6 .…”

Section: Introductionmentioning

confidence: 99%

Femtosecond laser fabricated multimode fiber sensors interrogated by optical-carrier-based microwave interferometry technique for distributed strain sensing

et al. 2016

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A multimode fiber (MMF) based cascaded intrinsic Fabry-Perot interferometers (IFPIs) system is presented and the distributed strain sensing has been experimentally demonstrated by using such system. The proposed 13 cascaded IFPIs have been formed by 14 cascaded reflectors that have been fabricated on a grade index MMF. Each reflector has been made by drawing a line on the center of the cross-section of the MMF through a femtosecond laser. The distance between any two adjacent reflectors is around 100 cm. The optical carrier based microwave interferometry (OCMI) technique has been used to interrogate the MMF based cascaded FPIs system by reading the optical interference information in the microwave domain. The location along with the shift of the interference fringe pattern for each FPI can be resolved though signal processing based on the microwave domain information. The multimode interference showed very little influence to the microwave domain signals. By using such system the strain of 10 -4 for each FPI sensor and the spatial resolution of less than 5 cm for the system can be easily achieved.

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Microwave interrogated large core fused silica fiber Michelson interferometer for strain sensing

Cited by 51 publications

References 22 publications

An IFPI Temperature Sensor Fabricated in an Unstriped Optical Fiber with Self-Strain-Compensation Function

An IFPI Temperature Sensor Fabricated in an Unstriped Optical Fiber with Self-Strain-Compensation Function

Adaptable Optical Fiber Displacement-Curvature Sensor Based on a Modal Michelson Interferometer with a Tapered Single Mode Fiber

Femtosecond laser fabricated multimode fiber sensors interrogated by optical-carrier-based microwave interferometry technique for distributed strain sensing

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