Heterodyne interrogation system for TDM interferometric fiber optic sensors array

Fang, Gaosheng; Xu, Tuanwei; Li, Fang

doi:10.1016/j.optcom.2014.12.018

Cited by 19 publications

(5 citation statements)

References 18 publications

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“…Multiplexing divides the capacity of the communications channel between several logical channels, one for each multiplexed sensor. The inverse process consists of extracting the original channels in the receiver and is called demultiplexing [37,38].…”

Section: Multiplexed Remote Fos Networkmentioning

confidence: 99%

Truly remote fiber optic sensor networks

Soto

López-Amo

2019

J. Phys. Photonics

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An overview of truly remote fiber optic sensors is presented in this work. It starts with a brief introduction of fiber optic sensor networks, showing their advantages and multiple applications. Then, the definition of truly remote networks is provided, and their main challenges discussed, such as increasing the sensing distance and the number of sensors interrogated. Several multiplexing techniques have been compared, such as wavelength, time and coherence division multiplexing. In relation to this, the most recent works showing multi wavelength fiber lasers for wavelength division multiplexing have been grouped and their versatility analyzed. Finally, recent and relevant truly remote fiber optic networks have been gathered and some of the most representative schemes explained in detail, comparing their multiplexing capability and the remoteness of the monitored sensors. Random distributed feedback fiber lasers form part of a number of these schemes, proving the suitability of this type of lasers for their use in ultra-long truly remote sensing applications.

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Section: Multiplexed Remote Fos Networkmentioning

confidence: 99%

Truly remote fiber optic sensor networks

Soto

López-Amo

2019

J. Phys. Photonics

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“…The FBG sensor has the advantages of small volume, light weight, high reliability, high accuracy, anti-electromagnetic interference, long life, moisture proof and good resistance to causticity [ 9 , 10 , 11 , 12 , 13 , 14 ]. In particular, with the development of multiplex technology [ 15 ], FBG will have a broad application prospect.…”

Section: Introductionmentioning

confidence: 99%

Research on Strain Measurements of Core Positions for the Chinese Space Station

Shen

Zeng

Luo³

et al. 2018

Sensors

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The Chinese space station is designed to carry out manned spaceflight, space science research, and so on. In serious applications, it is a common operation to inject gas into the hull, which can produce strain of the bulkhead. Accurate measurement of strain for the bulkhead is one of the key tasks in evaluating the health condition of the space station. This is the first work to perform strain detection for the Chinese space station bulkhead by using optical fiber Bragg grating. In the period of measurements, the resistance strain gauge is used as the strain standard. The measurement error of the fiber optical sensor in the circumferential direction is very small, being less than 4.52 με. However, the error in the axial direction is very large with the highest value of 28.93 με. Because the measurement error of bare fiber in the axial direction is very small, the transverse effect of the substrate of the fiber optical sensor likely plays a role. The comparison of the theoretical and experimental results of the transverse effect coefficients shows that they are fairly consistent, with values of 0.0271 and 0.0287, respectively. After the transverse effect is compensated, the strain deviation in the axial detection is smaller than 2.04 με. It is of great significance to carry out real-time health assessment for the bulkhead of the space station.

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“…Generally, there are three widely used signal demodulation methods to faithfully calculate the sensing measurand, called the heterodyne [5,6], the phase generated carrier (PGC) [7] and the

3 \times 3

coupler [8,9]. In addition, a new demodulation method called the “rectangular-pulse binary (RPB) phase modulation” was recently proposed [10] by our group.…”

Section: Introductionmentioning

confidence: 99%

Precisely Automatic Time Window Locating for an Interferometric Fiber-Optic Sensor Array Based on a TDM Scheme

Cui

Ren

Qian

et al. 2018

Sensors

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Interferometric fiber-optic sensors are often organized in the form of large-scale arrays by lending the technique of time division multiplexing (TDM) to reduce the system cost. Discriminating the time windows for different sensor units is the prerequisite to successfully demodulate the sensing message, but it traditionally calls for a very time-consuming manual calibration process. To combat this problem, a novel automatic time window locating method is proposed in this paper. It introduces the concept of shape function and carries out the cross-correlation operation between the shape function and the sensor signal. The shape function is defined as the function whose curve profile reflects the main data characteristics of the sensor signal. The time window information is then extracted from the correlation result. This whole process is carried out automatically by the interrogation controller of the sensor system without any manual intervene. Experiments are conducted to validate this method. The proposed method can greatly reduce the complexity of locating time windows in large-scale TDM sensor arrays, and make the practical use of the TDM scheme much more convenient.

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Heterodyne interrogation system for TDM interferometric fiber optic sensors array

Cited by 19 publications

References 18 publications

Truly remote fiber optic sensor networks

Truly remote fiber optic sensor networks

Research on Strain Measurements of Core Positions for the Chinese Space Station

Precisely Automatic Time Window Locating for an Interferometric Fiber-Optic Sensor Array Based on a TDM Scheme

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