DTS (Distributed Temperature Sensing)

Introduction

Distributed Temperature Sensor is designed and produced for a wide-range multi-point temperature measurement application. The DTS system can measure the distribution of temperature field where the optical fibers lay by one or more than one temperature measurement optical fibers through transceiver modules. They are flame-proof, explosion-proof, corrosion-resistant, high pressure resistant and anti-electromagnetic radiation. Besides, they are endowed with the characteristics of wide measurement range, high positioning accuracy and user-friendliness.

Measuring Principle

The Distributed Temperature Sensor adopts distributed optical fiber temperature sensing method. They make use of spontaneous Raman scattering signal and OTDR (Optical Time Domain Reflectance) generated by optical transmission in optical fiber to obtain the temperature field distribution information. When laser pulses with a certain energy and width are injected into the fiber, they will generate backward Raman scattered light during transmission in the optical fiber. The intensity of backward Raman scattered light will change according to the received temperature of fiber scattering points. The scattered Raman light wave will go through optical filter, photovoltaic conversion, light wave amplification and analog-to-digital conversion. And then temperature signal can be displayed isochronously while the Roman light waves are under the processing in signal processing system. And the temperature information is located according to the transmission speed of the light wave and time of back-scattered light optical echoes n in the optical fiber. The backward Raman scattered lights are very faint, so it requires a very high gain and low noise on thermometric indicator for the detection. Also in order to achieve accurate spatial orientation, the thermometer requires sufficient temporal resolution, that is to say, bandwidth and sampling frequency.

Technical Parameters

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