cover

B. S. Evenden; M. Pieuchot:

Seismic Prospecting Instruments. Volume 2

Instrument performance and testing.

Ed.: E Grau; P.N.S. O'Brien

1984. XIV, 158 pages, 94 figures, 17x24cm, 550 g
Language: English

(Geoexploration Monographs, Number 3)

ISBN 978-3-443-13014-5, bound, price: 35.00 €

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Keywords

seismic technologytelemetry systemsdigital seismic dataauxiliary equipment

Contents

Content Description top ↑

The first edition of this well accepted and widely used book was printed in 1971. It is evident, that many of the types of equipment described in this first edition became obsolete while the bulk of those in use over the recent years were not mentioned.

Seismic technology has been moving fast. At all times, seismic instrument manufacturers have made use of the most modern components available. The rate of technological improvements in the electronics industry kept on increasing even faster after the mid sixties with the development of data processing and the more recent boom on electronic computers of all kinds. As a result of this situation, the new edition does not deal any more with analogue recording on magnetic tape. Instead two separate parts were assigned to the description of the more complex digital systems.

Also, a new chapter was added dealing with telemetry systems which were not even in a development stage at the time of the first edition and which are still evolving at the present time. This book has been written for people with different scientific backgrounds. Its purpose is to make intelligible to geophysicists words and concepts developed and used by specialists and also to prevent geophysicists from being overwhelmed with esoteric names or abbreviations commonly used by observers and instrument men.

Contents top ↑

Seismic detectors 1
Geophones - The connection of geophones in groups - The testing of geophones
Introdution to seismic recording 29
Short history of seismic recording - The digital representation of waveforms - Technology. The basic electronic elements of a digital data acquisition system - Data flow in a digital seismic data acquisition system
Signal processing in digital seismic data acquisition systems 59
Synoptic diagram of a seismic data acquisition system - Seismic inputs - Pre-amplifier filters - The multiplexer - Sample and hold - Sampling window - The gain ranging amplifier - Analogue to digital conversion
Digital recording and playback 73
General description of a digital recorder - Computer transports - Field tape transports - Tapes and tape handling - Magnetic heads - Bit encoding - Tape drive system - Errors and defects in digital records - Formatting and formats - Digital playback in the field
The visual recorder 94
The recording camera - Testing the visual recorder
Auxiliary equipment 106
Blasters - Auxiliary channels - Line test and other test equipment - The reduction of a.c. pickup - Cable break detectors - Stackers - Correlators
Telemetry systems 126
Evolution of the spread configurations - The recording problem - The cable problem - Telemetry systems - Digitizing at the geophone location - The Communication link - Telemetry systems using conductors for data transmission - Telemetry systems using a radio transmission - A system storing the data in a cassette - Application of telemetry to off-shore recording - Advantages and inconveniences of each type of telemetry system - Telemetry vs. conventional systems
Instruments tests 140
The philosophy of testing - What is to be tested? - Recorded and un-recorded tests - The periodicity of tests - Noise and offset - Harmonic distortion - Channel to channel accuracy - Accuracy of the gain steps - Inpulse response - Cross-feed - Testing the tape skew - Polarity check
Bibliography, Index 154