发展了一种能够有效检测复合材料分层的光纤Mach Zehnder干涉仪。用一只2×2耦合器和一只3×3耦合器构成光纤干涉仪,输出信号经A/D转换后送入计算机,用软件进行信号解调。将此干涉仪的一个臂埋入材料内部或粘贴在复合材料表面,沿光纤逐点下压材料,通过光纤干涉仪测量出传感光纤形变的大小和方向,这样就能够有效的检测出材料内部是否存在分层。 A fiber Mach Zehnder interferometer that can effectively detect the delamination of the composite has been developed. A 2 × 2 coupler and a 3 × 3 coupler form an optical fiber interferometer. The output signal is converted to a computer by A / D conversion and demodulated with software. An arm of the interferometer is embedded in the material or pasted on the surface of the composite material, the material is pressed down along the optical fiber point by point, and the size and direction of the sensing optical fiber distortion are measured by the optical fiber interferometer so that the material interior can be effectively detected Whether there is stratification.