Aiming at problem of poor long-term stability

and poor anti-electromagnetic interference capability and difficult networking of traditional soil pressure sensors

a fiber Bragg grating（FBG）soil pressure sensor is designed based on matching principle of soil medium and pressure transducer to fulfill temperature and soil pressure monitoring simultaneously.The sensitivity coefficient

matching are analyzed theoretically.According to analysis result

the sensor is packaged and its pressure is calibrated and temperature self-compensation property experiment are carried out.Experimental results indicate that output wavelength shows good linear relation with soil pressure and temperature indiv

idually

coefficient of pressure sensitivity is 272.19 pm/MPa

resolution ratio is 0.36%

with a linear correlation of 99.989%;temperature sensitivity coefficient is 21.16 pm/℃ with a linear correlation of99.998%.temperature self-compensation capability at range of 0

4

0 X.is good

which meet requirements of engineering application.