Novel distributed fibre sensor using microwave heterodyne detection of spontaneous Brillouin backscatter

Maughan, Sally M.; Mignani, A. G.; Lefèvre, H. C.

doi:10.1117/12.2302285

Cited by 11 publications

(19 citation statements)

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“…Figure 2 is a schematic diagram of microwave heterodyne detection in distributed optical fiber Brillouin sensing system [7][8][9]. The system uses a narrow linewidth laser as the light source, which is divided into a pump light and a reference light through the coupler.…”

Section: Fig 1 Distributed Optical Fiber Sensing Systemmentioning

confidence: 99%

The LabVIEW Based Distributed Optical Fiber Sensing System for the Concrete Bridges

Zhang

Zhou

Si-bao

2012

Lecture Notes in Electrical Engineering

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Abstract. The linear relationship among Brillouin frequency shift, strain and temperature has been analyzed in this paper. The microwave heterodyne detection for the Brillouin frequency shift was studied and employed to establish a bridge safety monitoring system. The detection and demodulation of the signals from the microwave heterodyne Brillouin sensing system have been simulated based on the LabVIEW through the development of VI programs.

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Section: Fig 1 Distributed Optical Fiber Sensing Systemmentioning

confidence: 99%

The LabVIEW Based Distributed Optical Fiber Sensing System for the Concrete Bridges

Zhang

Zhou

Si-bao

2012

Lecture Notes in Electrical Engineering

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“…And the Brillouin scattering of the probe light will transmit back into a 50/50 coupler. The other part of light (10%) is used as the local reference light and scrambled by a polarization scrambler (PS) to reduce the polarization noise [3] [10]. The scrambled reference light is injected into the same 50/50 coupler to mix with the Brillouin backscattering.…”

Section: A Optical Part Of the Systemmentioning

confidence: 99%

“…It can be utilized to measure the strain and/or temperature continuously along the fiber [1]~ [3]. Since the Brillouin scattering light is very weak and its SNR is low, D. Lee et al studied on the pulse coding/decoding technique in the BOTDR [4]~ [6].…”

Section: Introductionmentioning

confidence: 99%

Design of fast pulse coding/decoding system for BOTDR

Zhu

Zhang

et al. 2012

2012 Photonics Global Conference (PGC)

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Brillouin Optical Time Domain Reflectometry (BOTDR) has the ability to measure strain and temperature continuously in a fiber. It can be applied in the health structural monitoring for large-scale civil project such as bridges, dams and smart grid. Pulse coding/decoding technique can improve Signal to Noise Ratio (SNR) of BOTDR signal. However, at present, the data process of pulse coding/decoding technique generally relies on the software system. Such a system will be large in size and time consuming in the procedure of data transmission and processing. In this paper, we designed a dedicated hardware system with field programmable gate array (FPGA) using Simplex codes. We optimized the hardware structure and data processing algorithm to reduce the time cost. Experiments proved that this optimized design has the ability to obtain higher SNR of Brillouin backscattering signal than single pulse with less time consumption.

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“…The CRN are the fluctuations in backscatter intensity [75,76] that appear when the coherence length is greater than the pulse length [76]. This occurs due to the interference caused by the superposition of several light waves arriving at the detector with random phase [75,76]. The coherence length is given by…”

Section: High Dynamic Otdrmentioning

confidence: 99%

“…The Coherent Rayleigh Noise or Coherent Fading Noise is a major problem for OTDRs that use narrow linewidth laser sources and is common in coherent detection but it can appear even when intensity detection is used (incoherent) [74]. The CRN are the fluctuations in backscatter intensity [75,76] that appear when the coherence length is greater than the pulse length [76]. This occurs due to the interference caused by the superposition of several light waves arriving at the detector with random phase [75,76].…”

Section: High Dynamic Otdrmentioning

confidence: 99%

Automatic High-Dynamic and High-Resolution Photon Counting Otdr for Optical Fiber Network Monitoring

Calliari¹

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Novel distributed fibre sensor using microwave heterodyne detection of spontaneous Brillouin backscatter

Cited by 11 publications

References 0 publications

The LabVIEW Based Distributed Optical Fiber Sensing System for the Concrete Bridges

The LabVIEW Based Distributed Optical Fiber Sensing System for the Concrete Bridges

Design of fast pulse coding/decoding system for BOTDR

Automatic High-Dynamic and High-Resolution Photon Counting Otdr for Optical Fiber Network Monitoring

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