Sensing of the contents of a bore

A sensor system (1) for sensing the contents of a bore comprises plural coils (11) disposed behind a non-metallic lining (10). An oscillator circuit (41) drives electrical oscillations in the coils to generate oscillating electromagnetic fields, and a detection circuit (42) outputs signals from each...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	Alan Patrick John Finlay, Martin Roy Harrison
Format:	Patent
Sprache:	eng
Schlagworte:	DETECTING MASSES OR OBJECTS EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS GEOPHYSICS GRAVITATIONAL MEASUREMENTS MEASURING MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PHYSICS TESTING
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	A sensor system (1) for sensing the contents of a bore comprises plural coils (11) disposed behind a non-metallic lining (10). An oscillator circuit (41) drives electrical oscillations in the coils to generate oscillating electromagnetic fields, and a detection circuit (42) outputs signals from each coil representing a parameter of the electrical oscillations that depends on the contents of the bore. The coils include a primary coil (5) and a secondary coil (6), wherein the oscillating electromagnetic field generated by the secondary coil has a lesser degree of interaction with the contents of bore than the oscillating electromagnetic field generated by the primary coil. The sensor system compensates the output signal from the primary coil for environmental effects using the output signal from secondary coil.