1.5 um Brillonin-based fibre optic distributed temperature sensor with high spatial resolution of 20cm

Spatial resolution is an important parameter in distributed optical fiber Raman temperature sensor system (DOFRTS). In this paper, a 10 kilometers long DOFRTS with spatial resolution of about 6 meters is constructed. The spatial resolution is limited by electrical bandwidth of the photodetector circuit and the data acquisition part. The abrupt temperature changes along the fiber axis are treated as temporal pulse signals, and a linear amplitude coefficient modification algorithm is used to improve the spatial resolution. The experimental results show that the temperature amplitudes from 3 meters region to 6 meters can be modified accurately. Therefore, a DOFRTS of high spatial resolution but low system cost could be successfully constructed.

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Two-Dimensional Spatial Resolution in Plane Temperature Monitoring Based on Raman Distributed Temperature Sensor

Machine Learning and Artificial Intelligence - Frontiers in Artificial Intelligence and Applications ◽

10.3233/faia200795 ◽

2020 ◽

Author(s):

Junfan Chen ◽

Ning Sun ◽

Zhongxie Jin

Keyword(s):

Temperature Field ◽

Field Distribution ◽

Spatial Resolution ◽

Temperature Sensor ◽

Temperature Sensing ◽

Two Dimensional ◽

Distributed Temperature Sensing ◽

Temperature Field Distribution ◽

Sensing System ◽

Distributed Temperature Sensor

Spatial resolution is an important parameter that characterizes the detection capability of a system, and there are extremely high requirements for spatial resolution in important fields such as the fossil energy industry and nuclear industry. In order to realize the high-precision distributed monitoring of the optical fiber distributed temperature sensing system (DTS), the factors affecting the spatial resolution of the DTS system were analyzed, and a two-dimensional planar temperature field distribution monitoring scheme based on Raman distributed temperature sensor (RDTS) was proposed. In this scheme, based on the layout of the two-dimensional RDTS heat source positioning system, multimode fiber was adopted. After comparing several sensing fiber routing schemes, the 45∘ skew 2D wiring method of sensing fiber was finally selected. According to the experimental results, the spatial resolution of the temperature field distribution in the monitoring area can break through the limitation of the system resolution. It has more application value than the traditional one-dimensional distributed temperature sensing system.

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A superior cathodoluminescence spectral analysis and imaging system for semiconductor characterisation

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100088506 ◽

1991 ◽

Vol 49 ◽

pp. 838-839

Author(s):

P J Wright

Keyword(s):

Spectral Analysis ◽

Electron Microscope ◽

Spatial Resolution ◽

High Spatial Resolution ◽

Imaging System ◽

Fibre Optic ◽

Transmission Losses ◽

The Past ◽

Improved Performance ◽

Electron Microscopes

Cathodoluminescence is a useful technique in the structural and electro optical characterisation of semiconductors. When performed in a electron microscope, both high spatial resolution images and spectra may be obtained by use of the correct equipment.Many designs for instruments suitable for cathodoluminescence spectral analysis and imaging in electron microscopes have been described in the literature during the past 25 years. These have often exhibited improved performance when compared with commercially available systems. The prime reason for this has been the willingness of the dedicated CL researcher to mount large, heavy monochromators directly to the chamber of their microscope. The result has been a microscope committed to CL analysis. However, many potential CL users have to use shared facilities and may not compromise the performance or appearance of the microscope. Subsequently, many CL systems have had the monochromator decoupled from the CL collection optics by either fibre optic bundles or quartz fibres. This has allowed the monochromator and its associated detectors to be easily decoupled from the SEM when not in use. Considerable transmission losses have been incurred and in many cases, it has been necessary to duplicate detectors to allow both spectral analysis and imaging. This has resulted in instruments which were less than optimum in both efficiency and operation.

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