What is Distributed Temperature Sensing (DTS) and How Does It Work?

With the rapid development of renewable energy and smart grids, monitoring the safety of critical infrastructure such as wind farms and battery storage facilities is highly important. In these high-load industrial environments, an abnormal cable temperature is often the earliest indicator of equipment failure or fire hazards. The Distributed Fiber Optic Temperature Sensing Analyzer is a real-time, online, and continuous monitoring system based on Raman scattering and optical time-domain scattering principles. It serves as a core solution to address these industrial pain points.

The Core Principles of Distributed Temperature Sensing (DTS)

DTS technology operates using the optical fiber as both the transmission medium and the sensing element. The system relies on two primary physical principles to function:

• Raman Scattering: When a pulsed laser is introduced into the sensing fiber, it interacts with the molecular thermal vibrations within the fiber core. This process generates inelastic scattering known as Raman scattering, which produces lower-frequency Stokes light and higher-frequency anti-Stokes light. The intensity of the backward anti-Stokes light is highly sensitive to external temperature changes, while the Stokes light is typically used as a reference signal. By evaluating the optical signal intensity, the system can demodulate the continuous temperature distribution along the fiber.

• Optical Time-Domain Reflectometry (OTDR): To accurately localize the spatial position of a temperature reading, the system measures the time $t$ from when the laser pulse enters the sensing fiber to when the backscattered light returns to the photodetector. Combined with the speed of light V in the fiber, the distance X to the scattering point can be calculated.

Core Technical Advantages of the HERTZINNO HZ-DTS System

Designed for complex industrial monitoring environments, HERTZINNO developed the HZ-DTS-1004/1008/1016 series analyzers. The equipment provides precise detection, identification, and accurate localization of temperature with the following key specifications:

• Long-Distance Monitoring with No Blind Spots: The sensor cable requires no power and provides a safety warning distance of up to 13 km. The system performs distributed measurement with no blind spots across this range.

• High Precision and Zero Missing Reports: The system maintains a spatial positioning distance accuracy within 1 m and a temperature accuracy of ±0.5°C, ensuring a missing report rate of zero.

• Low Power Consumption and Historical Storage: The system features low average power consumption per unit distance and includes 120GB of internal storage, which is capable of holding 5 to 10 years of history data.

Key Application Scenarios: Addressing Industrial Temperature Challenges

Due to its advantages such as resistance to electromagnetic interference and intrinsic safety, Raman distributed fiber sensing technology has significant application value in smart grids and large-scale infrastructure.

1. Detecting Abnormal Cable Temperatures

In long-distance power transmission, insulation aging or local overloads cause abnormal cable temperature rises. The HZ-DTS system is suitable for underground cable monitoring, analyzing the thermal state of the entire line. If abnormal temperature fluctuations occur, the system provides a rapid response time (2s for 2 km, less than 10s for 13km) to issue alerts.

2. Full-Line Safety Monitoring for Wind Farms

Wind farms are often situated in remote locations and contain extensive underground power collection cables. Utilizing the large monitoring range of the HZ-DTS system allows for long-distance automated monitoring, realizing unattended operation for the entire wind farm network. The fiber can be laid alongside the power cables to monitor the temperature continuously from the wind turbines to the substation.

3. Preventing Thermal Runaway in Battery Storage

Battery storage facilities contain dense clusters of cells that are vulnerable to thermal runaway caused by localized short circuits. Because the HERTZINNO sensor cable requires no power, it is intrinsically safe and can be routed directly through battery racks and critical electrical pathways. The 1 m spatial resolution guarantees continuous monitoring, ensuring that the system identifies any localized overheating immediately to trigger linked warnings.