High-pressure hydrogen leakage detection method and system

The invention relates to a high-pressure hydrogen leakage detection method and system. The method comprises the following steps: sensing ultrasonic waves generated when hydrogen leakage occurs in a high-pressure hydrogen storage device by using a fiber bragg grating; emitting initial light to the fiber bragg grating by using a wide-spectrum light source of a demodulator; the initial light generates reflected light on the deformed fiber bragg grating; carrying out wavelength detection on the reflected light by using the demodulator to obtain a specific wavelength; calculating a central wavelength drift distance according to the specific wavelength based on a temperature compensation principle; and judging whether a hydrogen leakage accident occurs or not according to the central wavelength drift distance. Based on the advantages of small size, wide detection range, high precision, strong stability, good real-time performance and the like of the fiber bragg grating, hydrogen leakage is identified by utilizing t