Title :
ALC crystal oscillator based pressure and temperature integrated measurement system for high temperature oil well applications
Author :
Bianchi, R.A. ; Karam, J.M. ; Courtois, B.
Author_Institution :
TIMA Lab., Grenoble, France
Abstract :
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
Keywords :
BiCMOS analogue integrated circuits; application specific integrated circuits; crystal oscillators; frequency stability; harmonic oscillators (circuits); high-temperature electronics; measurement systems; oil technology; pressure measurement; temperature measurement; 220 C; BiCMOS integrated circuit; application specific integrated circuit; automatic level controlled oscillator circuits; frequency resolution; frequency stability; fundamental mode oscillators; high temperature oil well applications; integrated measurement system; measurement stability; mixer structure; oil well bottom conditions; pressure measurement; temperature measurement; third harmonic mode oscillator; Application specific integrated circuits; Automatic control; Automatic logic units; Control systems; Integrated circuit measurements; Oscillators; Petroleum; Pressure measurement; Temperature measurement; Temperature sensors;
Conference_Titel :
Frequency and Time Forum, 1999 and the IEEE International Frequency Control Symposium, 1999., Proceedings of the 1999 Joint Meeting of the European
Conference_Location :
Besancon
Print_ISBN :
0-7803-5400-1
DOI :
10.1109/FREQ.1999.841487
