VARIABLE FREQUENCY SIGNAL GENERATOR

摘要

PROBLEM TO BE SOLVED: To provide a variable frequency signal generator and a variable frequency signal generating method which provide a light source of two wavelengths in which an interval between oscillation wavelengths changes due to strain, and creates a signal of a frequency corresponding to the interval between the oscillation wavelengths by beating two light signals of respective wavelengths.SOLUTION: A variable frequency signal generator includes: a light source creating a light signal; a resonator into which the light signal by the light source is input; a structure deformable due to strain; a first optical fiber grid which is disposed on the structure, is transparent to the light signal in a wavelength band including a first wavelength and a second wavelength, and is optically connected to the resonator; a second optical fiber grid which is optically connected to the resonator and filters out the light signal of the first wavelength and the second wavelength; and a photoelectric transducer which is optically connected to the resonator and creates a signal of a frequency corresponding to an interval between the first wavelength and the second wavelength. The interval between the first wavelength and the second wavelength accords to a degree of deformation of the structure.