Gas refractometry using a hollow-core photonic bandgap fiber in a Mach-Zehnder-type interferometer

Shavrin, Igor; Novotny, Steffen; Shevchenko, Andriy; Ludvigsen, Hanne

doi:10.1063/1.3681171

Cited by 28 publications

(13 citation statements)

References 21 publications

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“…Photonic crystal fiber (PCF) with the intrinsic advantage of a microstructure holes structure is also suitable for gas RI sensing. For example, a Mach-Zender interferometer [3] using a hollow-core photonic bandgap fiber as one of the interferometer's arms was proposed for measuring the RI of an air-acetylene gas mixture. Longperiod gratings inscribed in PCF [4] have also been demonstrated for measuring the RI of Ar.…”

Section: Introductionmentioning

confidence: 99%

Hybrid optical fiber Fabry–Perot interferometer for simultaneous measurement of gas refractive index and temperature

Wang

Qiao

2014

Appl. Opt.

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We present a hybrid miniature optical fiber Fabry-Perot interferometer for simultaneous measurement of gas refractive index and temperature. The interferometer is fabricated by cascading two short sections of capillary tubes with different inner diameters. One extrinsic interferometer is based on the air gap cavity formed by the capillary tube with large diameter. Another section of capillary tube with small inner diameter performs as an intrinsic interferometer and also provides a channel enabling gas to enter and leave the extrinsic cavity freely. The experiment shows that the different dips or peaks in fringe exhibit different responses to the changes in gas refractive index and temperature. Owing to this feature, simultaneous measurement of the gas refractive index and temperature can be realized.

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Section: Introductionmentioning

confidence: 99%

Hybrid optical fiber Fabry–Perot interferometer for simultaneous measurement of gas refractive index and temperature

Wang

Qiao

2014

Appl. Opt.

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“…M-Z interferometric fiber sensors have also been demonstrated [14][15][16][17][18]. For example, I. Shavrin et al designed an M-Z interferometer that used a section of SMF as one arm and a section of HC-PCF as the other [16]. Coherent light output from the two fibers generated interferograms captured by a CCD camera.…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive Gas Refractometer Using Capillary-Based Mach–Zehnder Interferometer

Chen

et al. 2020

Sensors

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In this paper, we report a capillary-based Mach–Zehnder (M–Z) interferometer that could be used for precise detection of variations in refractive indices of gaseous samples. The sensing mechanism is quite straightforward. Cladding and core modes of a capillary are simultaneously excited by coupling coherent laser beams to the capillary cladding and core, respectively. An interferogram would be generated as the light transmitted from the core interferes with the light transmitted from the cladding. Variations in the refractive index of the air filling the core lead to variations in the phase difference between the core and cladding modes, thus shifting the interference fringes. Using a photodiode together with a narrow slit, we could interrogate the fringe shifts. The resolution of the sensor was found to be ~5.7 × 10−8 RIU (refractive index unit), which is comparable to the highest resolution obtained by other interferometric sensors reported in previous studies. Finally, we also analyze the temperature cross sensitivity of the sensor. The main goal of this paper is to demonstrate that the ultra-sensitive sensing of gas refractive index could be realized by simply using a single capillary fiber rather than some complex fiber-optic devices such as photonic crystal fibers or other fiber-optic devices fabricated via tricky fiber processing techniques. This capillary sensor, while featuring an ultrahigh resolution, has many other advantages such as simple structure, ease of fabrication, straightforward sensing principle, and low cost.

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“…Besides, the output of most of the above-mentioned fiber bend sensors are temperature dependent, and no devices operating in high temperature have been reported so far. Hollow core photonic crystal fibers (HC-PCFs) have been exploited to build sensor devices for applications like particle detecting [9], gas refractive index sensing [10], and strain sensing [11]. In this Letter, we report on an optical fiber inclinometer based on a fiber modal interferometer using simplified HC-PCF.…”

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confidence: 99%

Direction-independent fiber inclinometer based on simplified hollow core photonic crystal fiber

Liu

Hou

et al. 2013

Opt. Lett.

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A fiber optical inclinometer based on modal interferometer is demonstrated for bend angle sensing. The device consists of a piece of simplified hollow core photonic crystal fiber sandwiched between single mode fibers with lateral offset. The measurement of bend angles up to 45° is demonstrated, and the spectrum exhibits a blueshift of over 50 nm. The sensitivity is found to increase with the applied bend angles and reaches 2.4 nm/deg at 45°, and the response is independent of the direction of bending. A low temperature sensitivity of 0.5 pm/°C is observed between room temperature and 1000°C. Due to its capacity for withstanding high temperature, the device can work as a direction-independent inclinometer in high-temperature environments.

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Gas refractometry using a hollow-core photonic bandgap fiber in a Mach-Zehnder-type interferometer

Cited by 28 publications

References 21 publications

Hybrid optical fiber Fabry–Perot interferometer for simultaneous measurement of gas refractive index and temperature

Hybrid optical fiber Fabry–Perot interferometer for simultaneous measurement of gas refractive index and temperature

Ultrasensitive Gas Refractometer Using Capillary-Based Mach–Zehnder Interferometer

Direction-independent fiber inclinometer based on simplified hollow core photonic crystal fiber

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