Simultaneous distributed strain and temperature measurement

Smith, Jeff; Brown, Anthony W.; DeMerchant, Michael D.; Bao, Xiaoyi

doi:10.1364/ao.38.005372

Cited by 57 publications

(29 citation statements)

References 8 publications

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“…2,3 Measurements of both the frequency shift of inelastically scattered photons and the linewidth of the resulting Brillouin peaks provide unique information regarding mechanical properties of materials, such as strain, temperature, stiffness, and elasticity constants. [4][5][6][7][8] More recently, Brillouin spectroscopy has been extended from a point sampling technique into an imaging modality, 9 heralding potential applications in cellular imaging and in-vivo diagnostics. Recent progress with virtually imaged phased arrays (VIPAs) 10,11 has enabled a dramatic reduction of acquisition times.…”

Section: Spectral Broadening In Brillouin Imagingmentioning

confidence: 99%

Spectral broadening in Brillouin imaging

Antonacci

Foreman

Paterson

et al. 2013

Applied Physics Letters

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Brillouin microscopy is an emerging imaging modality that provides fundamental information about mechanical properties of media in a non-contact manner. To date, low numerical aperture (NA) optics have been used, due to noticeable angular broadening of the Brillouin spectrum at higher NAs. In this work, we investigate theoretically and experimentally the dependence of spectral broadening effects in Brillouin imaging on system NA, for both 90 degrees and 180 degrees scattering geometries. Lineshape deformations and broadening are found to be minimised in a backscattering geometry, hence paving the way for high resolution in-vivo mechanical imaging. (C) 2013 AIP Publishing LLC

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Section: Spectral Broadening In Brillouin Imagingmentioning

confidence: 99%

Spectral broadening in Brillouin imaging

Antonacci

Foreman

Paterson

et al. 2013

Applied Physics Letters

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“…By using the same principle, an improved system has been reported which achieved a temperature resolution of 4 ℃, a strain resolution of 290 micro-strain, and a spatial resolution of 10 m for a sensing length of 15 km with LEAF fiber [27]. The demonstration of Brillouin gain for the power and Brillouin shift provides better performance for simultaneous temperature and strain measurement interpretation over the standard communication fiber, it gives 3-m spatial resolution for the temperature resolution of 3 ℃ and strain resolution of 180 με [28].…”

Section: Simultaneous Temperature and Strain Sensing Using Distributementioning

confidence: 99%

Recent progress in optical fiber sensors based on Brillouin scattering at university of Ottawa

Bao

Chen

2011

Photonic Sens

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The distributed sensor is proven to be a powerful tool for civil structural and material process monitoring. Brillouin scattering in fiber can be used as point sensors or distributed sensors for measurement of temperature, strain, birefringence and vibration over centimeters (Brillouin grating length) for point sensor or the pulse length for the distributed sensor. Simultaneous strain and temperature measurement with a spatial resolution of 20 cm is demonstrated in a Panda fiber using Brillouin grating technique with the temperature accuracy and strain accuracy of 0.4 ℃ and 9 µε. This technique can also be used for distributed birefringence measurement. For Brillouin optical time domain analysis (BOTDA), we have developed a new technique to measure differential Brillouin gain instead of Brillouin gain itself. This technique allows high precision temperature and strain measurement over long sensing length with sub-meter spatial resolution: 50-cm spatial resolution for 50-km length, using return-to-zero coded optical pulses of BOTDA with the temperature resolution of 0.7 ℃, which is equivalent to strain accuracy of 12 µε. For over 50-km sensing length, we proposed and demonstrated frequency-division-multiplexing (FDM) and time-division-multiplexing (TDM) based BOTDA technique for 75-km and 100-km sensing length without inline amplification within the sensing length. The spatial resolution of 2 m (100 km) and Brillouin frequency shift accuracy of 1.5 MHz have been obtained for TDM based BOTDA and 1-m resolution (75 km) with Brillouin frequency shift accuracy of 1 MHz using FDM based BOTDA. The civil structural health monitoring with BOTDA technique has been demonstrated. Distributed fiber sensors based on Brillouin scatteringFor over two decades, distributed optical fiber sensors based on Brillouin scattering have gained much interest for their potential capabilities of monitoring temperature [1] and strain [2] in civil and structural engineering, environmental monitoring, and geotechnical engineering. Brillouin scattering occurs as a result of refractive-index fluctuations caused by acoustic waves resulted from thermally generated sound waves, and such thermal agitation is capable of scattering incident lightwaves with shifted frequencies. Stimulated Brillouin scattering (SBS) enhances the Brillouin scattering in a Brillouin optical time domain analysis (BOTDA) [3][4][5][6][7][8] with intense signal and better spatial resolution comparing with a spontaneous scattering based Brillouin optical time domain reflectometry (BOTDR) [9][10][11]. At present, there are two schemes to realize a BOTDA, including Brillouin gain [3][4][5] and Brillouin loss [6][7][8]. In a Brillouin-gain-based

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“…Another approach, called the distributed measuring method, can overcome these limitations in many ways. Distributed measurements exploit the optical transport properties of fibers; namely, the fact the reflectance or absorption of light is influenced by the measurement target so the light intensity, frequency, and polarization state can change [1][2][3]. By measuring these changes, we can measure physical quantities in a specific point in the fiber.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Brillouin Backscattering for Distributed Temperature Sensor Applications

Kim¹,

Kwon²,

Kwon³

et al. 2011

Journal of Sensor Science and Technology

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We present measurements of the Brillouin frequency shift in an optical fiber using a 1550 nm distributed feedback laser diode(DFB-LD) as a light source. By modulating the probe light with an electro-optic modulator, we confirm the stimulated Brillouin gain spectrum(BGS) and spontaneous BGS using the coherent detection method. We also confirm the applicability of the technique to distributed temperature sensors that measure the change in Brillouin frequency shift due to temperature variations.

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Simultaneous distributed strain and temperature measurement

Cited by 57 publications

References 8 publications

Spectral broadening in Brillouin imaging

Spectral broadening in Brillouin imaging

Recent progress in optical fiber sensors based on Brillouin scattering at university of Ottawa

Measurement of Brillouin Backscattering for Distributed Temperature Sensor Applications

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