Beijing Tongwei Sensing distributed optical fiber temperature monitoring system DTS optical fiber sensing demodulation equipment

Distributed fiber optic temperature monitoring system DTS︱TV-4000

introduction

The distributed optical fiber temperature monitoring system has been developed in recent years and is used to measure the spatial temperature field in real time. The system uses optical fiber as a sensor and has great market development potential.

system introduction

DTS distributed optical fiber temperature monitoring system is a relatively mature distributed optical fiber temperature measurement technology used at home and abroad. The system uses optical fiber sensing signals and transmission signals,and uses advanced OTDR technology and the temperature-sensitive characteristics of Raman scattered light to detect The temperature changes at different locations along the optical fiber are analyzed intelligently based on the data to achieve truly distributed measurement,which can provide timely warning of fire hazards and accurately locate the location of the fire.

The DTS products of Technology Co.,Ltd.,the measurement channel and measurement distance are determined according to the actual situation. It adopts embedded industrial control technology,modular design and high reliability. At the same time,it relies on the advantages of high-speed signal processing technology to achieve high spatial resolution and technology. The indicators have reached the international advanced level. This product can provide DTS temperature measurement based on multi-mode optical fiber and single-mode optical fiber. It is especially suitable for online monitoring of high-voltage cables and has received good feedback in practical applications.

System principle

The basic principle of DTS is that Raman scattering occurs when laser light is transmitted in an optical fiber,and the Raman scattered light is divided into Stokes light and anti-Stokes light. When the optical fiber is heated,the in anti-Stokes light intensity is much larger than the in Stokes light intensity. Utilizing the characteristics of anti-Stokes light intensity and Stokes light intensity,the back-scattered Raman light signal with temperature information is collected through the wavelength division multiplexer and photodetector,and the real-time signal can be demodulated through signal processing. temperature information. In the time domain,the temperature point can be located based on the transmission rate of light in the optical fiber and the echo time of back-scattered Raman light using optical time domain reflection technology. Realize distributed measurement of optical fiber temperature field.

System composition

DTS distributed optical fiber temperature monitoring system consists of the following parts:

1. Alarm monitoring host

Function: Process the temperature signals collected by the temperature detection component group,and can observe the real-time temperature curve,historical temperature data,icon analysis data,etc. of each optical cable in real time.

2. Temperature detection component set

Function: Receive optical signals in real time,and output optical cable temperature data after processing and self-calibration.

3. Temperature measurement optical cable

Function: Lay out the optical fiber measuring cable (fiber) on site as a temperature sensor and lay it close to the measured object.

4. Configuration software

Function: Display optical cable real-time temperature curve,alarm information,historical data,analysis reports,etc.

5. Analysis software

Function: Runs in the temperature detection component,responsible for collecting light signals and converting them into temperature signals.

System Features

. Continuous distributed measurement

Distributed optical fiber sensors are truly distributed measurements,which can continuously obtain all temperature information along the detection optical cable. There is no measurement blind zone,the rate of false alarms and false alarms is greatly reduced,and real-time monitoring is achieved at the same time.

. Modular design,easy to install

Optical fibers are both sensors and transmission Modular design,very convenient to install and maintain.

. Anti-electromagnetic interference,can work normally in high-temperature electromagnetic environmentdo

The optical fiber itself is made of quartz material and is completely electrically insulated; at the same time,the signal of the optical fiber sensor is carried by the optical fiber,which is inherently safe and not subject to interference from any external electromagnetic environment.

.Innately lightning protection

Lightning often destroys a large number of electrical measuring sensors. Due to complete electrical insulation,fiber optic sensors can withstand high voltage and high current impacts.

. measurement distance,suitable for remote monitoring

The two outst advantages of are the large amount of transmitted data and low loss. It can achieve remote monitoring of more than ten kilometers without the need for relays.

. High sensitivity and high measurement accuracy

Theoretically,the sensitivity and measurement accuracy of most fiber optic sensors are better than ordinary sensors,and the actual application of mature products has proven this.

. life,low cost,simple system

The material of optical fiber is generally quartz glass,which has the characteristics of corrosion resistance,fire resistance,water resistance and life. It can usually serve for 30 years. Considering the sensor's own cost and future maintenance costs,the use of fiber optic sensors can greatly reduce the final operating cost of the entire project.

System parameters

Model: TV4000-XX-YY

TV4000—Distributed optical fiber temperature measurement system (Distributed Temperature Sensor)

XX: Number of channels.

YY—Kilometers.

Product parameters:

Application scope

Temperature measurement and fire monitoring in tunnels,subways,and highways

Power plants,coal mine underground,power equipment,cable status detection,cable tunnel and cable interlayer fire monitoring

Structural health monitoring of water conservancy dams,bridges,etc.

Condition monitoring of flammable material storage warehouses,oil depots,oil pipelines,etc.