Design Of Off-Line Analysis System Based On Data Acquisition And Storing By Grating Sensor

The acquisition system obtains the geological information through the geophone in seism prospecting. Geophone is the special sensor that could convert signal of mechanical vibration into signal of electricity and could be used in seism prospecting or measure of project-field. It is also a special precision machining combined with electric instrument. Its capability directly affects recording quality of seismic wave and explaining of seismic data. It is the most important part during collecting seismic wave data. The seismograph has much better quality than geophone in the field of seism prospecting. So it is the bottleneck to progress the prospecting techniques. That is to say, the geophone restricts the seismograph to improve the precision of exploration.The up-to-date digital grating geophone has been developed based on moire technique. Using the subdivision technique, the geophone can improve its resolution further more. As the subdivision precision become higher and higher, the traditional direction-discriminating technology cannot meet the need of system. It has become the main factor that restricts the development of high precision subdivision technology. How to deal with the problems of traditional direction-discriminating technology has become one of the main tasks. So I study traditional direction-discriminating circuitries and other subdivision technology , have made a new type direction-discriminating circuitry in order to confirm the problems of traditional direction-discriminating circuitry. Take the characteristic of digital subdivision and moire fringe direction-discriminating signal into consideration , we can summarize the direction-discriminating measure using the digital signal. It can work with the digital subdivision technology, completes the digital grating geophone in digital signal processing. The resolution of the digital grating geophone can be markedly improved.The main achievements in scientific research are described as follow: (1) The compact flash , which has high speed, small figure and low power, is adopted to store the mass data. The mass vibrating signal data has been sampled and stored. And this is a practicable project for protable data sampling and storing. (2) The contradiction between direction-discriminating circuitry and digital subdivision technology has been found. A new type direction-discriminating circuitry has been made to confirm the problems in traditional direction-discriminating circuitry clearly exist. Traditional direction-discriminating circuitry undoubtedly restrict the development of subdivision technology. (3) The characteristics of the moire fringe...