Half etched fiber Bragg grating (HEFBG) is designed and studied by spectral properties under applied axial force. To design the HEFBG, a half-length of a given FBG is thinned down to 12$\mu m$ diameter through the chemical corrosion with hydrofluoric acid. Under an applied axial force, the Bragg wavelengths due to etched and unetched parts of the HEFBG encounter different peak shifts and sensitivity. The peak-to-peak differences due to various axial forces are determined by analysing the spectral responses captured by an optical spectrum analyser (OSA). Theoretically and experimentally, it is observed that the peak-to-peak differences are a linear function of applied force. Using HEFBG as sensor probe, axial force sensitivity of 1.96 nm/N and resolution of 0.010 N are achieved over the range of applied force 0.20 N −2.50 N.

对半蚀刻光纤布拉格光栅（HEFBG）进行了设计，并在施加轴向力的情况下通过光谱特性对其进行了研究。为了设计HEFBG，将给定FBG的一半的长度减薄至12$\mu 米$直径通过氢氟酸的化学腐蚀而产生。在施加的轴向力下，归因于HEFBG蚀刻和未蚀刻部分的布拉格波长会遇到不同的峰移和灵敏度。通过分析由光谱分析仪（OSA）捕获的光谱响应，可以确定由于各种轴向力引起的峰峰值差异。从理论上和实验上，观察到峰间差异是施加力的线性函数。使用HEFBG作为传感器探头，在施加力0.20 N -2.50 N的范围内，可获得1.96 nm / N的轴向力灵敏度和0.010 N的分辨率。