美国航空航天局朗利研究中心和罗彻斯特大学的研究人员建造了一台全光纤傅里叶变换频谱仪。该设备测量通过它的信号波长,从紫外辐射产生的光纤相位光栅来的外耦合辐射角度是信号测量的基础。轴向反射器产生一反向传播束,以与光纤光栅中的传播束发生干涉,并向光纤包层投射相干图 Researchers at the NASA Longlee Research Center and the University of Rochester built an all-fiber Fourier transform spectrometer. The device measures the wavelength of the signal passing through it and the angle of out-coupling radiation from the fiber phase grating created by the UV radiation is the basis for the signal measurement. The axial reflector produces a backpropagation beam that interferes with the propagation beam in the fiber grating and projects a coherence map to the fiber cladding