That transmission rate and the FWHM of the fiber grating F?P are very sensitivity for radial strain. But the central wavelength, mode number of the fiber grating F?P are insensitivity for radial strain.

• 发现光纤光栅F P干涉仪的透射率和光谱半宽度对轴向应变十分敏感,而F P腔的中心波长和工作模式却变化较小。