A method for measuring a tilt angle of a vibrating mirror for scanning, the vibrating mirror comprising a first surface, wherein the vibrating mirror is disposed adjacent to a fixed second surface, an excitation coil is disposed on the first surface, and an induction coil (205, 2051, 2052) is disposed on the second surface, wherein the method comprises: - inputting a current signal with a preset frequency into the excitation coil; - detecting an induction voltage signal generated on the induction coil (205, 2051, 2052); - determining a variation of distance between the excitation coil and the induction coil (205, 2051, 2052) according to the induction voltage signal and an initial distance between the excitation coil and the induction coil (205, 2051, 2052); and - determining a tilt angle of the first surface according to the variation of distance, wherein the induction coil (205, 2051, 2052) comprises two coils, and each of the two coils is located at a different position on the second surface, wherein detecting the induction voltage signal generated on the induction coil (205, 2051, 2052) comprises: - detecting an induction voltage signal generated on each of the two coils, wherein determining the variation of distance between the excitation coil and the induction coil (205, 2051, 2052) according to the induction voltage signal and the initial distance between the excitation coil and the induction coil (205, 2051, 2052) comprises: - determining a variation of distance between the excitation coil and each of the two coils according to the induction voltage signal generated by each of the two coils and an initial distance between each of the two coils and the excitation coil, and wherein determining the variation of distance between the excitation coil and each of the two coils according to the induction voltage signal generated by each of the two coils and the initial distance between each of the two coils and the excitation coil comprises: - determining the variation of distance between the excitation coil and the induction coil (205, 2051, 2052) according to a difference between the induction voltage signals generated by the two coils, a sum of the induction voltage signals generated by the two coils, and the initial distance between the excitation coil and each of the two coils. wherein the method comprises: - inputting a current signal with a preset frequency into the excitation coil; - detecting an induction voltage signal generated on the induction coil (205, 2051, 2052); - determining a variation of distance between the excitation coil and the induction coil (205, 2051, 2052) according to the induction voltage signal and an initial distance between the excitation coil and the induction coil (205, 2051, 2052); and - determining a tilt angle of the first surface according to the variation of distance, - inputting a current signal with a preset frequency into the excitation coil; - detecting an induction voltage signal generated on the induction coil (205, 2051, 2052); - determining a variation of distance between the excitation coil and the induction coil (205, 2051, 2052) according to the induction voltage signal and an initial distance between the excitation coil and the induction coil (205, 2051, 2052); and - determining a tilt angle of the first surface according to the variation of distance, wherein the induction coil (205, 2051, 2052) comprises two coils, and each of the two coils is located at a different position on the second surface, wherein detecting the induction voltage signal generated on the induction coil (205, 2051, 2052) comprises: - detecting an induction voltage signal generated on each of the two coils, - detecting an induction voltage signal generated on each of the two coils, wherein determining the variation of distance between the excitation coil and the induction coil (205, 2051, 2052) according to the induction voltage signal and the initial distance between the excitation coil and the induction coil (205, 2051, 2052) comprises: - determining a variation of distance between the excitation coil and each of the two coils according to the induction voltage signal generated by each of the two coils and an initial distance between each of the two coils and the excitation coil, and - determining a variation of distance between the excitation coil and each of the two coils according to the induction voltage signal generated by each of the two coils and an initial distance between each of the two coils and the excitation coil, and wherein determining the variation of distance between the excitation coil and each of the two coils according to the induction voltage signal generated by each of the two coils and the initial distance between each of the two coils and the excitation coil comprises: - determining the variation of distance between the excitation coil and the induction coil (205, 2051, 2052) according to a difference between the induction voltage signals generated by the two coils, a sum of the induction voltage signals generated by the two coils, and the initial distance between the excitation coil and each of the two coils. - determining the variation of distance between the excitation coil and the induction coil (205, 2051, 2052) according to a difference between the induction voltage signals generated by the two coils, a sum of the induction voltage signals generated by the two coils, and the initial distance between the excitation coil and each of the two coils.