In addition to the advantages of ordinary sensors — anti-electromagnetic interference, high sensitivity, small size, light weight, low cost, and suitability for high-temperature and corrosive environments — the fiber Bragg grating temperature measurement system also has the unique advantages of strong intrinsic self-correlation capability and the use of multiplexing technology on one fiber line to realize multi-point reuse and multi-parameter distributed differential measurement. So what is the development direction of the fiber Bragg grating temperature measurement system? Let's take a look below.

The development of the fiber Bragg grating temperature measurement system is mainly considered from three aspects: the light source, the fiber Bragg grating sensor and the signal demodulation. For the improvement of the sensing system, the purpose is to configure different light sources, sensors and demodulation systems according to the number of sensors, sensor sensitivity and demodulation system resolution, according to specific measurement needs, so as to achieve low cost, small error and high measurement accuracy. For the future digital requirements of fiber Bragg grating sensing systems, light sources with good reliability, broadband and high power should be used. Erbium-doped, neodymium-doped and ytterbium-doped low-temperature plasma light beams are the key to future development.

Fiber Bragg grating sensors can realize both single-parameter and multi-parameter measurement. For single-parameter measurement, the sensitivity and detection precision of the sensor should be improved. In practical applications, attention should be paid to the balance between sensor sensitivity and measurement range: when the sensitivity is high, the measurement range naturally becomes smaller, mainly because the strain of the fiber Bragg grating has a specified value — above this value the fiber sensor will be damaged. In order to achieve quasi-distributed measurement, the number of multiplexed sensors is relatively large. When arranging sensors for tunnel temperature measurement fiber, sometimes several sensors with different sensitivities need to be arranged at one point to achieve a wide range measurement of ambient temperature and pressure. Since the sensing quantity is mainly a subtle wavelength shift as the medium, a practical signal demodulation scheme must have a strong wavelength resolution. Secondly, the detection of dynamic and static signals must be solved, especially the combined detection of the two, which has become a difficult problem in the practical demodulation technology of fiber optic sensing. The great advantage of the fiber Bragg grating temperature measurement system lies in the good reuse of sensors to achieve distributed sensing.