Vibrating spool densitometer immune to cabling effects

Patent · Tue Feb 07 04:00:00 EST 1989

OSTI ID:6161540

Maier, L C

This patent describes an apparatus for use with a densitometer having a probe the probe having a probe output connected to a probe output cable having a signal conductor and a shield conductor, and a probe driver coupled to the probe, comprising: a loop circuit coupled between the probe output and the probe driver; amplifying means, coupled in the loop circuit, for amplifying a signal provided on the signal conductor with a phase shift independent of a length or capacitance loading of the probe output cable, the amplifying means including means for holding the signal provided on the signal conductor at ground potential as a current-varying signal; and phase/gain control means, coupled in the loop circuit between the amplifying means and the probe driver, for controlling the loop circuit to provide a loop gain of at least one and a substantially zero degree shift between the probe driver and the probe output signal.

• Assignee: Simmonds Precision Products, Inc., Tarrytown, NY
• Patent Number(s): US 4802360
• OSTI ID: 6161540
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
CABLES
CONTROL SYSTEMS
DENSIMETERS
DESIGN
ELECTRONIC CIRCUITS
MEASURING INSTRUMENTS
MECHANICAL VIBRATIONS
METERING
NATURAL GAS WELLS
OIL WELLS
PROBES
SIGNALS
WELLS