一种低成本无缆地震仪采集站的研制

随着电子技术的发展,许多新技术被应用到地球物理仪器之中.其中,无缆地震仪采集站具有重量轻、易搬运的特点,适宜应用于如森林、沼泽、沙漠等地面状况复杂的区域,可以在复杂地质条件下方便地进行地震数据采集,是未来地震仪发展的方向.本研究研发了一种低成本无缆地震仪采集站,通过分析无缆地震仪的发展方向,确定了采集站的设计方案,该系统采用了微功耗设计,GPS授时同步与低成本晶振相结合的时钟机制,并设计了基于多项分解的软件滤波器提高24位Σ-ΔADC的动态范围,其低成本、小体积、低功耗的特点使其非常适用于复杂区域下的资源勘探,并可应用于高密度、宽方位等物探新技术当中.

Design of a low cost Non-cable seismic acquisition station

As the development of electronic technology, lots of new technologies are introduced into geophysical exploration. Non-cable seismic acquisition station with lightweight, portable characteristic is suitable to work at forest, swamp, desert and other extremely complex area. The Non-cable seismic acquisition station allows workers to acquire seismic data easily. It represents future development trend of geophysical instruments.A low cost Non-cable seismic acquisition station is developed; the system of Non-cable seismic acquisition station is composed with GPS time service system, storage unit, data acquisition unit etc. The article emphasizes on the design thought, working principle and implementation method of high precision analog-digital conversion, low noise acquisition channel, time service system and low cost storage, introduces the design of correlative hardware circuit and software flowchart. It adopts electronics technologies like Low-power design, the precise timing service combined of GPS receiver and inexpensive crystal, low noise acquisition channel with 24-bit Delta-Sigma A/D converters and polyphase decomposition filter. By analyzing the principle of software control system and the function requirement for data acquisition, the hardware platform design method of seismic acquisition station based on the LPC2103MCU is given; we present a hardware designation based on ARM7 unit. By analyzing the noise source of amplifying circuit, and comparing the performance of several operational amplifiers, MAX4252 is adopted in this design. To improve the precision of analog-digital conversion, this paper discusses how to design a polyphase decomposition software filter. Further, methods of the low power consumption instrument designing is discussed and the paper puts forward the conception and designing measure of ultra-low power consumption instrument.To verify the rationality and feasibility of the design, simulation and test about the station has been done. We test the data consistency between 20 stations. With experimental verification, the seismic acquisition station has excellent performance of high precision and low power consumption. With the advantage of low cost, small size and low power consumption, it can be applied to high-density, wide azimuth and other new geophysical technologies.