Based Pvdf Geophone

With the rapid development of modern industry, oil energy security has become an important strategic material to assure world economic development, political stability and military security, which restricts the development of the society. Therefore, all-round improvement of oil exploration technology, increase world oil reserves has become a top priority. Seismic exploration is an effective geophysical method to proven underground structures, looking for oil and gas. Seismic geophone is the first part to ensure seismic exploration instrument work and also is the most important part. Its performance directly affects the whole seismic exploration technology, determine the availability of good geological profile and the correct geological interpretation. However, conventional geophone is already unable to meet the requirements of modern exploration techniques because of frequency range and sensitivity. According with this situation, this paper designs a PVDF acceleration seismic geophone after studying the existing detectors, and analysis of this detector's design concept and methods.PVDF (polyvinylidene fluoride) is a new polymer-based sensing material with good piezoelectric properties, high sensitivity, low acoustic impedance, wide frequency response, easy layout, corrosion resistance, and so on. Therefore, under the PVDF detector structure and reasonable design, PVDF piezoelectric acceleration detector with high sensitivity, wide bandwidth, high dynamic range, small size, low cost and strong anti-interference ability, in line with the requirement of seismic explorations.In this paper, the properties of reflected wave which can reach the seismic geophone are researched, and geological exploration of the requirements of geophone is analyzed.Then, according to the PVDF sensitive element, the equivalent model sensing equations for PVDF piezoelectric films is explored and a theoretical basis for the design of the geophone sensitive element is provided.And then, the accelerometer and transfer function of PVDF acceleration seismic geophone was established. And its frequency response characteristics are analyzed. Studied the structural characteristics of the geophone, a kind of reverse compression detector structure which is center with cantilever beam was designed, and the various parts of the structure is analyzed and designed.In addition, design the geophone size of various parts of the specific parameters, discuss the geophone constraints between natural frequency and sensitivity and produce the geophone in-kind. Compared with the standard geophone to study the characteristics of the tested geophone, including:voltage sensitivity, frequency response characteristics and the voltage sensitivity of the non-linear characteristics and so on, and determine the frequency of the geophone scope of work. From these properties we know the geophone has good performance and meet the demand of geological exploration.Finally, further research directions with it are briefly discussed.