地震仪数据采集技术的重大进展
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摘要
高分辨率地震勘探的发展要求地震仪能记录宽高频地震信号，这就需要地震仪具有很大的瞬时动态范围，然而以浮点放大器和逐次逼近型A／D为核心的传统数据采集电路却不能满足这一要求。新型的24位∑—ΔA／D转换器由于瞬时动态范围很大（达120dB），足可以使数据采集电路取消浮点放大器和所有模拟滤波器，而且允许以单个检波器取代检波器组合。24位A／D的应用是地震仪数据采集技术的一项重大进展。随着高分辨率地震勘探的发展，以24位A／D为核心的新型数据采集电路必将逐步取代传统的数据采集电路。
Sun Chuanyou and Jiang Chuzhu.Significant Progress iu Data Acquisition Technology of Seismic Instrument.PI,1995,9 (3): 125~132 Developments of high-resolution seismic prospecting require the seismic instrument to be able to record signals of Hi-frequency and wide bandwidth.Therefore,a very wide instantaneous dynamic range of seismic instrument is needed. However, the data acquisition circuit based on traditional IFPA and approximation Am converter connot meet this requirement. A new type of 24 bits ∑-ΔA/D converter has a instantaneous dynamic range of 120 dB, enough to miss IFPA and all analog filters,and even to replace geophone array by a single geophone. The application of this 24 bits A/D is a significant progress in seismic data acquisition technology.And with the development of Hi-resolution prospecting,the circuit with 24 bits A/D will ultimately replace the traditional ones.
Sun Chuanyou and Jiang Chuzhu.Significant Progress iu Data Acquisition Technology of Seismic Instrument.PI,1995,9 (3): 125~132 Developments of high-resolution seismic prospecting require the seismic instrument to be able to record signals of Hi-frequency and wide bandwidth.Therefore,a very wide instantaneous dynamic range of seismic instrument is needed. However, the data acquisition circuit based on traditional IFPA and approximation Am converter connot meet this requirement. A new type of 24 bits ∑-ΔA/D converter has a instantaneous dynamic range of 120 dB, enough to miss IFPA and all analog filters,and even to replace geophone array by a single geophone. The application of this 24 bits A/D is a significant progress in seismic data acquisition technology.And with the development of Hi-resolution prospecting,the circuit with 24 bits A/D will ultimately replace the traditional ones.
引文
1孙传友主编.遥测地震仪原理.北京:石油工业出版社,1992
2姚姚等编.地震勘探新技术与新方法.武汉:中国地质大学出版社,1991
3李庆忠.高分辨率地震勘探对地震仪器的技术改进要求.石油物探装备,1992(1)
4 I/O Inc.I/O SYSTEM TWO
5陆基孟.地震勘探原理.北京:石油工业出版社,1982
2姚姚等编.地震勘探新技术与新方法.武汉:中国地质大学出版社,1991
3李庆忠.高分辨率地震勘探对地震仪器的技术改进要求.石油物探装备,1992(1)
4 I/O Inc.I/O SYSTEM TWO
5陆基孟.地震勘探原理.北京:石油工业出版社,1982
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