Aiming at the problem of surface structure investigation

the small refractometer analog detector string signal has low fidelity

high maintenance cost and serious signal attenuation

a low-power

croppable digital smallrefraction acquisition node is designed.The node is based on the high-performance STM32 F405.The front end uses high-fidelity signal conditioning circuit to preprocess the seismic signal.After the high-accuracy A/D conversion

the data is collected through the customized PPP communication protocol and the acquisition control center.Communication.The pre-sampling and time stamping method in the driver design makes the synchronous acquisition accuracy between distributed nodes better than 10 μs.The experimental results show that the equivalent noise level of the acquisition node is lower than 1 μV

and the inter-channel distortion is less than-100 d B

which can effectively improve the acquisition accuracy and construction efficiency of field seismic exploration.