Abstract A densitometer which utilizes a thin vane vibrated by a magnetostrictive tube. A piezoelectric crystal pickup feeds an amplifier and tracking filter to energize a coil around the magnetostrictive tube. The device is, in effect, an electromagnetic oscillator in that the coil is driven in phase with the detected signal. Vibration thus increases in amplitude until limited electrically. A linearization circuit provides an output D.C. .voltage directly proportional to fluid density, gas, or liquid, which may be impressed upon a conventional D.C. voltmeter calibrated linearly in density. A great many features, both in the mechanical structure and in the electronics, make it possible to easily calibrate the instrument to read, for example, to within an accuracy tolerance of + OR - 0.01 percent over a fluid density range of, for example, from about 0.08 pounds per cubic foot to 80.0 pounds per cubic foot. Another outstanding advantage of the invention relates to a probe type construction which may be used in a pipeline of any size.
Inventors
👤 C Miller
👤 G Schlatter
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-01 01:03
CPC Classifications
G; G01; G01N; G01N9/00; G01N9/002; G01N2009/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
The method of calibrating a vibration densitometer, said method of comprising the steps of: measuring a resonant frequency, fa, of the densitometer in a first fluid of known density, da; measuring the same resonant frequency, fb, of the densitometer in a second fluid of known density, db; causing the densitometer to produce an output directly proportional to the expression (A/f2) + B where, f is the densitometer resonant frequency, and A and B are constants; and adjusting the densitometer until A becomes equal to the expression (fa2 fb2 (da - db))/(fb2 - fa2) and B becomes equal to the expression (db fb2 - da fa2)/(fb2 fa2)
Claim 2
Independent Claim
106 words
The method of calibrating a vibration densitometer, said method of comprising the steps of: measuring a resonant frequency, fa, of the densitometer in a first fluid of known density, da; measuring the same resonant frequency, fb, of the densitometer in a second fluid of known density, db; causing the densitometer to produce an output directly proportional to the expression (A/f2) + B where, f is the densitometer resonant frequency, and A and B are constants; and adjusting the densitometer until A becomes equal to the expression (fa2 fb2 (da - db))/(fb2 - fa2) and B becomes equal to the expression (db fb2 - da fa2)/(fb2 fa2)