Topological phase due to electric dipole moment and magnetic monopole interaction

We show that there is an anologous Aharonov-Casher effect on a neutral particle with electric dipole moment interacting with a magnetic filed produced by magnetic monopoles.Comment: 8 page

Diffuse-light absorption spectroscopy and chemometrics for discrimination and quantification of extra virgin olive oil adulterants

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Special Issue (1992) - I sensori a fibra ottica a modulazione d\u27intensit?: principio di funzionamento, problematiche e soluzioni

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Anti-biofouling coatings for optical fiber sensors

One of the most relevant problems of using optical fiber sensors in real-world environments is surface fouling, that is, the cumulative build-up of undesirable material on the working surface of the sensor. The present paper presents the results of tests of anti-biofouling coated fiber optic probes for reflectance spectroscopy in blood-simulating "foul" media, namely Bovine Serum Albumin (BSA) and Fibrinogen. The anti-biofouling coating was a cross-linkable polymer with silane functionality, to improve adhesion to silica-containing substrates

Analysis of a SD-OCT-based hyperspectral system for spectral reflectance measurements

In this study, we compare the hyperspectral imaging capabilities of a custom-built visible light OCT with those of a commercial grade hyperspectral camera. Using the Short-Time-Fourier-Transform algorithm on the OCT signal, we estimate the variation in the surface spectral response from two paint pigments. Our study aims at comparing the spectral measurements obtained from calibration samples and to estimate an optimal working point for OCT-based hyperspectral processing

Analysis of a SD-OCT-based hyperspectral system for spectral reflectance measurements

In this study, we compare the hyperspectral imaging capabilities of a custom-built visible light OCT with those of a commercial grade hyperspectral camera. Using the Short-Time-Fourier-Transform algorithm on the OCT signal, we estimate the variation in the surface spectral response from two paint pigments. Our study aims at comparing the spectral measurements obtained from calibration samples and to estimate an optimal working point for OCT-based hyperspectral processing

Avalanche photodiode based optical coherence tomography

Optical Coherence Tomography (OCT) is used to perform in vivo high-resolution imaging of biological tissue microstructures. In the present study, we evaluate the optimum conditions to use Avalanche photodiodes (APDs) in OCT to achieve maximum signal-to-noise (S/N) ratios. The optical sources employed in OCT have a large bandwidth. Due to beating within the source line-width, excess photon noise (EPN) is generated in addition to shot noise (SN). Usually, high speed OCT requires large optical power, which makes the EPN to dominate over the SN. Therefore, balanced detection is used to reduce the EPN. We analyse the optimisation of the OCT configuration with respect to the APD noise performance. When using APDs, another parameter has to be considered in the S/N analysis: that of the voltage across the APDs, which determines, both, the gain and the noise