Due to its high measurement accuracy, wide dynamic measurement range, non-contact measurement, easy automation and digitalization of systems, the grating sensor has been widely used in the mechanical industry.
Advanced composite materials have good fatigue resistance and corrosion resistance, and can reduce the weight of ships or spacecraft, which is of great significance for rapid navigation or flight. Therefore, composite materials are increasingly used in the manufacture of aerospace and marine tools. To fully measure the condition of the ship's hull, it is necessary to understand the deformation torque, shear pressure, and impact force on the deck of different parts of the hull. A typical ship structure requires about 100 sensors, so wavelength-division multiplexed fiber grating sensors with strong multiplexing capacity are most suitable for ship detection.
The fiber optic grating sensing system can measure the bending stress of the ship's hull and can also measure the impact force of the waves on the wet deck. In addition, in order to monitor the strain, temperature, vibration, take-off and landing driving status, ultrasonic field, and acceleration of an aircraft, usually more than 100 sensors are required, so the weight of the sensor should be as light as possible, and the size should be as small as possible. Therefore, the most flexible fiber optic grating sensor is the best choice. In addition, in fact, there are two directions of strain in aircraft composite materials, and embedded fiber optic grating sensors are ideal intelligent components for multi-point and multi-axial strain and temperature measurement.
Most of the sensors used in medicine are electronic sensors, which are not suitable for many internal medical surgeries, especially in high microwave (radiation) frequency, ultrasonic field, or laser radiation high heat treatment. Because the metal conductors in electronic sensors are easily interfered by electromagnetic fields such as current and voltage, it can cause thermal effects around the sensing head or tumor, leading to incorrect readings.
In recent years, the use of high-frequency current, microwave radiation, and laser for thermal therapy to replace surgery has attracted more and more attention from the medical community. Moreover, the small size of sensors is very important in medical applications because small size causes less damage to human tissues, and fiber optic grating sensors are currently the smallest sensors that can be achieved. It can measure precise local information of temperature, pressure, and sound field inside human tissues through minimal invasive means.
Fiber optic grating sensors can also be used to measure the efficiency of the heart. In this method, the doctor inserts a thermal dilution catheter embedded with fiber optic gratings into the right atrium of the patient's heart and injects a cold solution to measure the temperature of the pulmonary artery blood, combined with pulse power to know the blood output of the heart, which is important for heart monitoring.