Diffuse Optical Techniques Applied to Wood Characterisation

Bargigia, Ilaria; Nevin, Austin; Farina, Andrea; Pifferi, Antonio; D’Andrea, Cosimo; Karlsson, Marcus; Lundin, Patrik; Somesfalean, Gabriel; Svanberg, Sune

doi:10.1255/jnirs.1068

Cited by 33 publications

(29 citation statements)

References 45 publications

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“…39 The source is a supercontinuum fiber laser (SuperK Extreme, NKT Photonics, Denmark) emitting pulsed white light radiation over the spectral range from 450 to 1750 nm with an overall power of 5 W. Typical pulse duration is in the order of tens of picoseconds, with a repetition rate of 80 MHz. The white light is then dispersed by an F2-glass PellinBroca prism (Bernhard Halle Nachfl, Germany) and light of the selected wavelength is focused onto an adjustable slit to achieve better spectral selection.…”

Section: Time-resolved Near-infrared Spectroscopy Setupmentioning

confidence: 99%

“…As part of a basic characterization, we obtained the spectra of the absorption and reduced scattering coefficients of the homogeneous phantom in the wavelength range from 600 to 1200 nm from measurements of diffuse reflectance using the time-domain broadband diffuse spectrometer 39 toner overlapped with the specific spectral features of the epoxy base material in the region beyond 850 nm. The scattering spectrum is rather monotonous and decreasing from 11 cm −1 at 600 nm down to 4 cm −1 at 1200 nm.…”

Section: Bulk Optical Propertiesmentioning

confidence: 99%

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Mechanically switchable solid inhomogeneous phantom for performance tests in diffuse imaging and spectroscopy

et al. 2015

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Abstract. A mechanically switchable solid inhomogeneous phantom simulating localized absorption changes was developed and characterized. The homogeneous host phantom was made of epoxy resin with black toner and titanium dioxide particles added as absorbing and scattering components, respectively. A cylindrical rod, movable along a hole in the block and made of the same material, has a black polyvinyl chloride cylinder embedded in its center. By varying the volume and position of the black inclusion, absorption perturbations can be generated over a large range of magnitudes. The phantom has been characterized by various timedomain diffuse optics instruments in terms of absorption and scattering spectra, transmittance images, and reflectance contrast. Addressing a major application of the phantom for performance characterization for functional near-infrared spectroscopy of the brain, the contrast was measured in reflectance mode while black cylinders of volumes from ≈20 mm 3 to ≈270 mm 3 were moved in lateral and depth directions, respectively. The new type of solid inhomogeneous phantom is expected to become a useful tool for routine quality check of clinical instruments or implementation of industrial standards provided an experimental characterization of the phantom is performed in advance.

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Section: Time-resolved Near-infrared Spectroscopy Setupmentioning

confidence: 99%

Section: Bulk Optical Propertiesmentioning

confidence: 99%

Mechanically switchable solid inhomogeneous phantom for performance tests in diffuse imaging and spectroscopy

et al. 2015

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“…biological tissues -conveys information on the absorption and scattering properties of the medium explored by photons along their paths. Diffuse optics [5] is a powerful tool in many applications like functional brain imaging [6][7][8], oximetry [9], mammography [10], monitoring of neoadjuvant chemotherapy [11], quality assessment of food [12], wood [13], pharmaceuticals [14], investigations of photon migration in random media [15] and many others.…”

Section: Introductionmentioning

confidence: 99%

Fast silicon photomultiplier improves signal harvesting and reduces complexity in time-domain diffuse optics

Mora¹,

Martinenghi²,

Contini³

et al. 2015

Opt. Express

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Abstract:We present a proof of concept prototype of a time-domain diffuse optics probe exploiting a fast Silicon PhotoMultiplier (SiPM), featuring a timing resolution better than 80 ps, a fast tail with just 90 ps decay time-constant and a wide active area of 1 mm 2 . The detector is hosted into the probe and used in direct contact with the sample under investigation, thus providing high harvesting efficiency by exploiting the whole SiPM numerical aperture and also reducing complexity by avoiding the use of cumbersome fiber bundles. Our tests also demonstrate high accuracy and linearity in retrieving the optical properties and suitable contrast and depth sensitivity for detecting localized inhomogeneities. In addition to a strong improvement in both instrumentation cost and size with respect to legacy solutions, the setup performances are comparable to those of state-of-the-art time-domain instrumentation, thus opening a new way to compact, low-cost and high-performance time-resolved devices for diffuse optical imaging and spectroscopy.

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“…Diffuse optics found interesting applications like imaging of brain function [1]- [3], oximetry [4], optical mammography [5], food [6] or wood [7] quality assessment, and characterization of pharmaceutical solids [8]. The most common technique is represented by Continuous-Wave (CW) approach [3].…”

Section: Introductionmentioning

confidence: 99%

Towards next generation time-domain diffuse optics devices

et al. 2015

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Diffuse Optics is growing in terms of applications ranging from e.g. oximetry, to mammography, molecular imaging, quality assessment of food and pharmaceuticals, wood optics, physics of random media. Time-domain (TD) approaches, although appealing in terms of quantitation and depth sensibility, are presently limited to large fiber-based systems, with limited number of source-detector pairs. We present a miniaturized TD source-detector probe embedding integrated laser sources and single-photon detectors. Some electronics are still external (e.g. power supply, pulse generators, timing electronics), yet full integration on-board using already proven technologies is feasible. The novel devices were successfully validated on heterogeneous phantoms showing performances comparable to large state-of-the-art TD rackbased systems. With an investigation based on simulations we provide numerical evidence that the possibility to stack many TD compact source-detector pairs in a dense, null source-detector distance arrangement could yield on the brain cortex about 1 decade higher contrast as compared to a continuous wave (CW) approach. Further, a 3-fold increase in the maximum depth (down to 6 cm) is estimated, opening accessibility to new organs such as the lung or the heart. Finally, these new technologies show the way towards compact and wearable TD probes with orders of magnitude reduction in size and cost, for a widespread use of TD devices in real life.

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Diffuse Optical Techniques Applied to Wood Characterisation

Cited by 33 publications

References 45 publications

Mechanically switchable solid inhomogeneous phantom for performance tests in diffuse imaging and spectroscopy

Mechanically switchable solid inhomogeneous phantom for performance tests in diffuse imaging and spectroscopy

Fast silicon photomultiplier improves signal harvesting and reduces complexity in time-domain diffuse optics

Towards next generation time-domain diffuse optics devices

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