A laser wavelength stabilized simultaneous multipoint fiber Bragg grating acousto-ultrasonic sensing system

摘要

The present invention relates to a laser wavelength stabilizing multi-point simultaneous optical fiber Bragg grating acoustic ultrasonic sensing system, comprising: a short-wavelength tunable laser beam irradiation unit for irradiating a laser beam having a wavelength variability; A 1 × n beam splitter for branching the short width variable wavelength laser beam incident from the short width variable wavelength laser beam irradiation unit into n channels; N strain-sensitive acoustic ultrasonic sensors based on optical fiber Bragg grating for modulating and reflecting an optical signal incident upon branching from a 1 × n beam splitter; N optical cycles for transmitting an optical signal modulated and reflected by the optical fiber Bragg grating-based n strain-sensitive acoustic ultrasonic sensor unit; An asymmetric beam splitter connected to an optical fiber Bragg grating based strain-free acoustic ultrasonic sensor unit having an average wavelength characteristic among n optical fiber Bragg grating spectra of the n-strain-sensitive acoustic ultrasonic sensor unit based on the optical fiber Bragg grating; A power sensor connected to the asymmetric beam splitter; n photodetectors for receiving and detecting optical signals from the n optical cyclers; And an n + 1 channel measurement and control unit connected to a power sensor and n photodetectors for receiving an optical signal and stabilizing a wavelength of the laser beam irradiated from the short-wavelength wavelength variable laser beam irradiation unit.