An acoustic emission wave detector that appropriately detects an acoustic emission wave is provided. The acoustic emission wave detector (3) is housed in the housing (3b), the optical fiber (3a) for guiding the light from the broadband light source (1) into the housing (3b), and the housing (3b). And an FBG (3c) having a diffraction grating (3g) that reflects light guided into the housing (3b), and the FBG (3c) is guided into the housing (3b) at one end thereof. The other end is fixed in the housing (3b) so as to receive light and receive an acoustic emission wave from the high-voltage device (G) at the other end.
展开▼
