Distributed Fiber Optic Online Temperature Measurement System（DTS）As a cutting-edge technology in the field of industrial temperature monitoring, relying on the physical properties of optical fibers and optical time-domain reflection（OTDR）The principle enables real-time perception and localization of temperature fields in long-distance and complex environments. Its technological core and significant features can be summarized as follows:

1、 Distributed temperature measurement principle based on Raman scattering

The system injects pulsed light into the fiber through a laser, and when the light is transmitted in the fiber, it undergoes inelastic collisions with molecules to produce Raman scattering light. The scattered light includes Stokes light with a slightly shorter wavelength and anti Stokes light with a slightly longer wavelength, where the intensity of the anti Stokes light is temperature sensitive. By using a wavelength division multiplexer to separate two optical signals, and after photoelectric conversion, the intensity ratio of anti Stokes light to Stokes light is utilized, combined with optical time-domain reflection technology to calculate the scattering point position, ultimately achieving accurate measurement of temperature along the fiber at the meter or even centimeter level. For example, in power cable monitoring, the system can capture real-time data0.1℃Temperature fluctuation at a certain level, with positioning accuracy of up to±1m.

2、 Technological breakthrough in fully distributed continuous monitoring

Compared with traditional point temperature measurement,DTSBreaking through spatial limitations. Its optical fiber is both a transmission medium and a sensor, capable of continuously collecting temperature data within a range of tens of kilometers, forming a dynamic temperature field without blind spots. In the scenario of tunnel fire warning, after laying optical fibers along the tunnel wall, the system can monitor changes in environmental temperature in real time. When the temperature rise rate in a certain area exceeds the set threshold, it immediately triggers constant temperature, differential temperature, or temperature rise rate alarms to save critical time for personnel evacuation.

3、 Characteristics of anti electromagnetic interference and intrinsic safety

Fiber optic cables are made of quartz material, which has electrical insulation properties and signal transmission is not affected by electromagnetic interference. This characteristic makes it perform excellently in strong electromagnetic field environments such as high-voltage cables and substations. At the same time, the passive working mode of the system avoids the risk of electric sparks, and its inherent lightning protection characteristics can resist high voltage shocks, effectively preventing safety accidents caused by static electricity in petrochemical tank monitoring.

4、 Long lifespan and low maintenance cost advantages

The lifespan of fiber optic sensors usually exceeds20Annual and does not require regular calibration. Its installation cost is only the same as that of traditional temperature measurement systems1/3Reduced maintenance volume90%In the bus duct monitoring project of a commercial building in Suzhou,3600Mi fiber optic coverage27Bus duct, realizing7×24Real time monitoring on an hourly basis, ensuring system stability99.9%The annual maintenance cost is less than 10000 yuan.

5、 Multi scenario adaptation and intelligent upgrade

The system supports multi-channel fiber optic synchronous measurement and is compatible with EthernetRS485Interface, can be integrated intoSCADASystem. Through the visualization platform, users can view temperature distribution curves, historical trends, and set multi-level alarm thresholds. In hydraulic engineering, the system combines strain and displacement parameter measurement to achieve early warning of dam leakage.

Distributed fiber optic online temperature measurement technology is reshaping the paradigm of industrial temperature monitoring through the integration of physical layer innovation and intelligence. Its continuous distributed measurement, anti-interference ability, and long-life characteristics provide safe and economical solutions for fields such as power, transportation, and petrochemicals.