KEYWORDS: Raman spectroscopy, Digital filtering, Signal to noise ratio, Sensors, Spatial resolution, Denoising, Temperature sensors, Electronic filtering, Signal attenuation
In this work, a deep convolutional adaptive filter is proposed to enhance the performance of a Raman based distributed temperature sensor system by the application of domain randomization methods for its training. The improvement of the signal-to-noise ratio in the Raman backscattered signals in the training process and translation to a real scenario is demonstrated. The ability of the proposed technique to reduce signal noise effectively is proved independently of the sensor configuration and without degradation of temperature accuracy or spatial resolution of these systems. Moreover, using single trace to noise reduction in the ROTDR signals accelerates the system response avoiding the employment of many averages in a unique measurement
A high-temperature distributed sensor solution based on a Brillouin Optical Time Domain Analyzer and a multimode gold-coated fiber is presented and experimentally validated in this paper. Distributed temperature measurements up to 600°C will be demonstrated.
In this paper we propose the employment of sub-pixel algorithms for the estimation of the central frequency of the
Brillouin Gain Spectrum in a Brillouin Optical Time Domain Analyzer. The experimental results will show that the
proposed solution shows a good performance when the chosen frequency step for the required frequency sweep is high.
If the improved computational efficiency in comparison to the traditional Lorentzian fitting is also considered, it can be
concluded that this approach may be of great interest for dynamic measurement scenarios.
A polarimetric Distributed Bragg Reflector (DBR) laser sensor in a low birefringent Er-doped fiber has been proposed. The spectral overlap of two uniform fiber Bragg gratings (FBG) has been employed as filtering technique to achieve a Single Longitudinal Mode (SLM) regime. By measuring the RF beat frequency between the two orthogonal polarized lasing modes and the absolute wavelength of one mode, both strain and temperature has been determined simultaneously.
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