FOG Based Inertial Strapdown System for Online Borehole Measurement

Gerhard Mutter, Herwig Malthan, Martin Hafen, and Christopher Noxon

Abstract:	This paper describes an Inertial Strapdown System developed for Measurement While Drilling applications WJD). The main objectives of this work are to demonstrate the potential of new sensor technologies in terms of in harsh environments, survivability accuracy and miniaturisation. Evaluation of results has shown that the FOG (Fibre Optic Gyro) and micro- mechanics sensor technologies have the capability/potential of fulfilling these objectives. A demonstration system has been developed and tested. The main elements of the system are a FOG-triad, an accelerometer-triad and a system CPU for the platform calculations. All elements are hard- mounted on a sensor block. Measurement results obtained so far fulfill the requirements and indicate that the applied Fibre Optic Gyro with accelerometer augmentation can provide a competitive alternative to the commonly used magnetic sensors or RLG or mechanical gyros. However, field trials results must be evaluated before a final statement can be made. Future work will include the miniaturisation of the system and increasing the operating temperature range.
Published in:	Proceedings of the 1994 National Technical Meeting of The Institute of Navigation January 24 - 26, 1994 Catamaran Resort Hotel San Diego, CA
Pages:	681 - 694
Cite this article:	Mutter, Gerhard, Malthan, Herwig, Hafen, Martin, Noxon, Christopher, "FOG Based Inertial Strapdown System for Online Borehole Measurement," Proceedings of the 1994 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 1994, pp. 681-694.
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