设计并实验研究了一种基于机械微应变引入长周期光纤光栅 (MLPFG) 的横向压力传感系统。利用机械线加工技术制作周期为600 μm，长度为60 mm的不锈钢压力槽板，测定了槽板对待写制光纤施加的横向压力与MLPFG谐振峰峰值之间的关系，并借助布拉格光纤光栅(FBG)搭建了高精度横向压力解调系统。实验表明，在0～60 N的范围内，压力与MLPFG透射谱深度有很好的线性关系，线性度达0.9950，灵敏度约为0.35 dB/N。保持45 N的压力20 h，MLPFG谐振峰峰值最大波动小于0.06 dB，具备良好的稳定性。采用中心波长为1542.890 nm的FBG实现了系统解调，系统灵敏度为0.12 μW/N，进一步提高了检测系统的实用性。

A high precision transverse pressure sensing system using mechanically-induced long period fiber gratings(MLPFG), is designed and studied experimentally. 60 mm-long periodic pressure grooves are made by mechanical line processing technology with the groove period of 600 μm. The relation between transverse pressure and MLPFG resonance peak is measured. Furthermore, a demodulation system is constructed employing a fiber Bragg grating(FBG), the results show that MLPFG transverse pressure has good linear relation with MLPFG resonance peak in the range of 0～60 N. Linearity is up to 0.9950 and the sensitivity is about 0.35 dB/N. Keeping the MLPFG transverse pressure 45 N for more than 20 h, the MLPFG resonance peak′s maximum fluctuation is less than 0.06 dB. The FBG with central-wavelength at 1542.890 nm is adopted to realize system demodulation, the system sensitivity is 0.12 μW/N, and the practicality of detecting system is further improved.