High resolution signal-processing method for extrinsic Fabry–Perot interferometric sensors

Xie, Jing; Wang, Fuyin; Pan, Yao; Wang, Junjie; Hu, Zhengliang; Hu, Yongming

doi:10.1016/j.yofte.2014.11.010

Cited by 36 publications

(20 citation statements)

References 12 publications

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“…For the real applications of fiber-optic FP sensors, one of the key issues is how to get the measured quantity through cavity length interrogation. Nowadays, the most commonly used methods are classified into two categories, laser interference method [5,6,7], and white light interference method [8,9,10,11,12,13,14,15,16]. The laser interference method uses the interfering effect of a single continuous-wave laser to measure cavity length changes of an FP sensor, which is relatively simple, but only relative cavity length changes in a limited range can be measured, and the laser wavelength has to be stabilized at the Q-point of the fiber FP cavity.…”

Section: Introductionmentioning

confidence: 99%

Absolute Single Cavity Length Interrogation of Fiber-Optic Compound Fabry–Perot Pressure Sensors Through a White Light Non-Scanning Correlation Method

Guo

Wang

et al. 2019

Sensors

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A white light non-scanning correlation interrogation system was proposed and built to interrogate absolute length of the air cavity of fiber-optic compound Fabry–Perot pressure sensors for the extraction of pressure value. By carefully choosing thickness range and tilt angle of the optical wedge used for cavity length matching, correlation interferometric signal of the basal cavity can be naturally filtered out. Based on peak positioning by Fourier transform, bandpass filtering in frequency domain, inverse Fourier transform back to time domain, envelope fitting and zero fringe finding through a gravity center method, cavity length can be determined with an accuracy of 0.04%. The system was used for the interrogation of a fiber-optic compound Fabry–Perot pressure sensor under different pressures. For a pressure range of 0.1~2.9 Mpa, the linear relationship between the air cavity length and the gas pressure imposed was successfully extracted.

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Section: Introductionmentioning

confidence: 99%

Absolute Single Cavity Length Interrogation of Fiber-Optic Compound Fabry–Perot Pressure Sensors Through a White Light Non-Scanning Correlation Method

Guo

Wang

et al. 2019

Sensors

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“…The most important technique for the real application of fiber FP sensors is cavity length interrogation. There are several kinds of methods for the cavity length interrogation of fiber FP sensors, such as single wavelength interrogation [10], dual wavelength interrogation [11], and white light interference interrogation [12,13,14,15,16,17,18,19,20,21,22]. For single wavelength interrogation, a continuous-wave laser with single wavelength output is used, which has to be stabilized at the Q-point of the fiber FP cavity, and only relative cavity length changes in a limited range can be measured.…”

Section: Introductionmentioning

confidence: 99%

“…This was also proposed for the absolute cavity length interrogation of fiber FP sensors, but with a relatively low length accuracy [17,18]. Another important and direct white light interference interrogation method, called white light spectral interrogation [19,20,21,22], uses an optical spectrum analyzer to directly determine the reflection spectrum of the fiber FP sensor and resolve the cavity length from the reflection spectrum.…”

Section: Introductionmentioning

confidence: 99%

“…In white light spectral interrogation, a data processing algorithm of a Fourier transform [19,20] or a digital correlation method [21,22] can be used to extract the absolute cavity length. The most commonly used optical sources in white light interference are amplified spontaneous emissions (ASEs) near the communication wavelength of 1550 nm; the 3-dB spectral width of such kinds of optical sources is usually below 50 nm.…”

Section: Introductionmentioning

confidence: 99%

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Two-Parameter Elliptical Fitting Method for Short-Cavity Fiber Fabry–Perot Sensor Interrogation

Zhang

Wang

Chen

et al. 2018

Sensors

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To solve the cavity interrogation problem of short cavity fiber Fabry–Perot sensors in white light spectral interrogation with amplified spontaneous emissions (ASEs) as the white light sources, a data processing method, using an improved elliptical fitting equation with only two undetermined coefficients, is proposed. Based on the method, the cavity length of a fiber Fabry–Perot sensor without a complete reflection spectrum period in the frequency domain can be interrogated with relatively high resolution. Extrinsic fiber Fabry–Perot air-gap sensors with cavity lengths less than 30 μm are used to experimentally verify the method, and are successfully interrogated with an accuracy better than 0.55%.

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“…With the widespread use of digital techniques in instrumentation and communication systems, full digital demodulation has become the current trend of fiber-optic Fabry-Perot sensor demodulation, which has the advantages of high speed, high precision, and good stability. However, the traditional full digital demodulation method still combines with large optical instruments [11][12][13][14]. This paper proposes a new demodulation algorithm based on the phase generated carrier (PGC) arc tangent function and the analysis of several mature demodulation methods.…”

Section: Introductionmentioning

confidence: 99%

An arc tangent function demodulation method of fiber-optic Fabry-Perot high-temperature pressure sensor

Ren

Hong

et al. 2017

Photonic Sens

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Abstract:A new demodulation algorithm of the fiber-optic Fabry-Perot cavity length based on the phase generated carrier (PGC) is proposed in this paper, which can be applied in the high-temperature pressure sensor. This new algorithm based on arc tangent function outputs two orthogonal signals by utilizing an optical system, which is designed based on the field-programmable gate array (FPGA) to overcome the range limit of the original PGC arc tangent function demodulation algorithm. The simulation and analysis are also carried on. According to the analysis of demodulation speed and precision, the simulation of different numbers of sampling points, and measurement results of the pressure sensor, the arc tangent function demodulation method has good demodulation results: 1 MHz processing speed of single data and less than 1% error showing practical feasibility in the fiber-optic Fabry-Perot cavity length demodulation of the Fabry-Perot high-temperature pressure sensor.

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High resolution signal-processing method for extrinsic Fabry–Perot interferometric sensors

Cited by 36 publications

References 12 publications

Absolute Single Cavity Length Interrogation of Fiber-Optic Compound Fabry–Perot Pressure Sensors Through a White Light Non-Scanning Correlation Method

Absolute Single Cavity Length Interrogation of Fiber-Optic Compound Fabry–Perot Pressure Sensors Through a White Light Non-Scanning Correlation Method

Two-Parameter Elliptical Fitting Method for Short-Cavity Fiber Fabry–Perot Sensor Interrogation

An arc tangent function demodulation method of fiber-optic Fabry-Perot high-temperature pressure sensor

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