High sensitivity;

Geometric shape has many adaptability, and can be made into any shape of optical fiber sensor; ;

Electrical insulation and chemical stability. Optical fiber itself is a material with high insulation and stable chemical properties, which is suitable for harsh environments such as high-voltage isolation, flammability and explosion in power systems and chemical systems.

Good security. Optical fiber sensor is an electrical passive sensitive element, and there are no potential safety hazards such as electric leakage and electric shock when it is used for measurement.

Anti-electromagnetic interference Generally speaking, the frequency of light wave is higher than that of electromagnetic radiation, so the propagation of light in optical fiber will not be affected by electromagnetic noise;

Distributed measurement. Optical fiber can realize long-distance continuous measurement and control, and can accurately measure strain, damage, vibration, temperature and other information at any point, forming a large-scale monitoring area and improving the detection level of the environment;

Long service life. The main material of optical fiber is timely glass, covered with polymer material, which is more durable than metal sensor.

Large transmission capacity. Taking optical fiber as the bus, the information of each sensing point is collected and stored by using large-capacity optical fiber instead of bulky multi-core underwater cable, and distributed optical fiber sensor monitoring is realized by multiplexing technology.

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A wide variety of sensors can be formed by using optical fibers, so some people call optical fiber sensors universal sensors. It can measure many physical quantities, and its application covers military, civil, commercial, medical and industrial control fields. Optical fiber can be used as a sensor to detect acceleration, speed, displacement, angular acceleration, angular velocity, angular displacement, pressure, bending, strain, torque, temperature, voltage, current, liquid level, flow rate, concentration, PH value, magnetism, sound, light, radiation and other physical quantities. Compared with the traditional sensors based on electricity, these sensors have essential differences in measurement principle. Traditional sensors are based on electromechanical measurement, while optical fiber sensors are based on optical measurement.

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Optical fiber sensor is a kind of sensor that converts the state of the measured object into measurable optical signal. The working principle of the optical fiber sensor is to send the light beam incident from the light source to the modulator through the optical fiber, and interact with the measured parameters in the modulator, which will change the optical properties of light, such as light intensity, wavelength, frequency, phase and polarization state, and become a modulated light signal, and then send it to the photoelectric device through the optical fiber, and obtain the measured parameters through the demodulator. In the whole process, the light beam is introduced through the optical fiber and emitted after passing through the modulator. The function of optical fiber is firstly to transmit light beam, and secondly to act as an optical modulator.