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ALC crystal oscillator based pressure and temperature integrated measurement system for high temperature oil well applications

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3 Author(s)
R. A. Bianchi ; TIMA Lab., Grenoble, France ; J. M. Karam ; B. Courtois

An application specific integrated circuit for the pressure and temperature measurement at the high temperature oil well bottom conditions, is presented in this paper. The system is mainly composed of three high performance Automatic Level Controlled (ALC) oscillator circuits which drive three external crystals (the sensitive elements), and of some mixing and filtering stages. The integrated system was successfully tested up to 220°C, showing a frequency resolution of 0.0003 ppm (0.0007 psi, for the pressure measurement) and a drift of 1.5 Hz/month (~0.5 psi/month), concerning respectively the short and long term measurement stability. A drastic reduction of the whole measurement tool size and cost will be allowed by means of this application specific BiCMOS integrated circuit

Published in:

Frequency and Time Forum, 1999 and the IEEE International Frequency Control Symposium, 1999., Proceedings of the 1999 Joint Meeting of the European  (Volume:2 )

Date of Conference:

1999