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The Principle, Characteristics and Applications of Fiber Bragg Grating Temperature Sensing Fire Detection System

Fiber Bragg grating temperature measurement, as a new technology of fiber optic temperature measurement, has been widely developed and applied. It uses fiber optic as the signal transmission and sensing medium, and utilizes the temperature sensitivity of fiber Bragg grating and the principle of light reflection to detect temperature changes. The fiber Bragg grating linear temperature sensor made using fiber Bragg grating demodulator technology is particularly suitable for temperature monitoring in high and low voltage switchgear, cable joints, petroleum and petrochemical storage tanks, etc. in substations due to its on-site non electric detection, intrinsic safety and explosion-proof, anti electromagnetic interference, lightning protection, good insulation, long service life, and small size. It can detect fire hazards in a timely manner and prevent them before they occur.

Fiber Bragg Grating Temperature Sensing Fire Detection System

Fiber Bragg Grating (FBG) fire detector is a new type of fire detection system based on FBG temperature sensing technology. It has the characteristics of high sensitivity, good long-term stability, and distributed installation and measurement. Due to its all optical characteristics
The characteristics of fiber passive measurement are particularly suitable for use in harsh environments such as flammable, explosive, and strong electromagnetic. Fiber optic grating sensor is a new type of fiber optic sensor made of fiber optic gratings. It is an all fiber passive device developed in the 1990s. Various sensors can be made using fiber optic gratings, such as temperature, strain, stress, acceleration, pressure, etc. Different fiber optic grating sensors can have different operating wavelengths, so wavelength division multiplexing technology can be used to cascade multiple fiber optic grating sensors in a single fiber for distributed measurement, enhancing the flexibility of wiring. Fiber optic sensors have the characteristics of small size, light weight, compatibility with optical fibers, low insertion loss, and good long-term stability in performance.

Fiber optic temperature sensors are a rapidly developing application range in the field of fiber optic sensors. Fiber optic temperature sensors can replace traditional temperature sensors in some situations. Compared with traditional resistance strain gauges, fiber optic sensors have obvious advantages such as small size, light weight, no electromagnetic interference, radiation resistance, and distributed measurement. Therefore, they have been widely used in the field of temperature measurement.

Characteristics and Applications of Fiber Bragg Grating Temperature Sensing Fire Detection System

Fiber Bragg Grating (FBG) temperature fire detectors have the characteristics of high measurement accuracy, good long-term stability, distributed measurement, and high sampling frequency, making them suitable for many temperature detection needs. They are mainly used in the following areas: 1. Fire detection in residential areas; 2. Temperature monitoring of commercial buildings; 3. Temperature monitoring of oil tanks in oil depots; 4. Temperature monitoring in explosion-proof areas; 5. Civil and construction engineering monitoring; 6. The distribution of temperature underground in oil wells.

Fiber Bragg Grating (FBG) thermal fire detectors generally include FBG thermal sensor arrays, signal processors, service terminals, customer terminals, and fire alarm controllers

The fiber optic grating linear temperature fire detector has high reliability and stability in transmission lines, and has the ability to stably transmit data under harsh conditions. At the same time, it has excellent resistance to damage, flame retardancy, good water resistance, and high strength. It adopts a service terminal/customer split mode, which is convenient for system topology and can achieve rich remote management interfaces. It is convenient to connect with upper management systems and can provide customized interfaces. Easy to configure and provide multiple alarm methods. The setting method of the internal fiber optic grating can make the fiber optic grating closest to the measured environment to the maximum extent, greatly improving the temperature response time of the fiber optic grating. Especially in fire alarms that require rapid response, it can provide real-time feedback on temperature changes at the fire site, prevent losses caused by response delay, and also improve the protection strength of the fiber optic grating. By using passive fiber Bragg gratings to sense the deformation of elastomers as alarm triggering signals, it has advantages such as anti electromagnetic interference, long transmission distance, and intrinsic safety. It can also be used in places without power supply and in dark and humid environments.

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