US3967490A
Expired / Lapsed
US
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Vibration densitometer
Assignee: International Telephone and Telegraph Corp
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Filing: 1975-06-27
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Granted: 1976-07-06
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Expires: 1995-06-27
Abstract
Abstract A vibration densitometer having a strain gage pick-up to serve at least four functions one at a time or to serve two, three or four functions in any combination of two, three or four. The strain gage is bonded to or may embody a vibrating vane or body to be immersed in a fluid. The strain gage may be bonded to a vane with glass or an epoxy or other uniting agent. If glass is used, the densitometer may undergo unusually high temperatures and still perform reliably and accurately. The strain gage may be used (1) as a pick-up in an electromechanical oscillator embodied in the densitometer, (2) as a portion of a fluid temperature indicator, (3) for instrument frequency error correction (computable in two ways) as function of temperature, and (4) for producing an indication of what the fluid density would be at a selected constant temperature.
Inventors
- 👤 Edward R. Brady, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:49
CPC Classifications
G; G01; G01N; G01N9/00; G01N9/002
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
176 words
A vibration densitometer comprising: a structure mounted for immersion in a fluid; a strain gage bonded to said structure; first means connected from said strain gage to vibrate said structure at its resonant frequency f; second means connected from said first means for producing an output signal at said resonant frequency; and third means connected from said strain gage and said second means for producing an output directly proportional to the density d of said fluid where ##EQU7## A and B are calibration constants, K is one of the numbers + 1 and - 1, α t is the temperature coefficient of the resonant period, where the resonant period is defined as the reciprocal of the resonant frequency, ΔT is the change in the temperature of said fluid from a predetermined reference temperature, f (x) is one of two functions, one of said functions being a constant, the other of said functions being f(ΔT) where F (ΔT) = 1 - α d ΔT and α d is the temperature coefficient of the volume of said fluid.
Claim 2
Dependent Claim
176 words
A vibration densitometer comprising: a structure mounted for immersion in a fluid; a strain gage bonded to said structure; first means connected from said strain gage to vibrate said structure at its resonant frequency f; second means connected from said first means for producing an output signal at said resonant frequency; and third means connected from said strain gage and said second means for producing an output directly proportional to the density d of said fluid where ##EQU7## A and B are calibration constants, K is one of the numbers + 1 and - 1, α t is the temperature coefficient of the resonant period, where the resonant period is defined as the reciprocal of the resonant frequency, ΔT is the change in the temperature of said fluid from a predetermined reference temperature, f (x) is one of two functions, one of said functions being a constant, the other of said functions being f(ΔT) where F (ΔT) = 1 - α d ΔT and α d is the temperature coefficient of the volume of said fluid.
Claim 3
Dependent Claim
176 words
A vibration densitometer comprising: a structure mounted for immersion in a fluid; a strain gage bonded to said structure; first means connected from said strain gage to vibrate said structure at its resonant frequency f; second means connected from said first means for producing an output signal at said resonant frequency; and third means connected from said strain gage and said second means for producing an output directly proportional to the density d of said fluid where ##EQU8## A and B are calibration constants, K is one of the numbers + 1 and - 1, α t is the temperature coefficient of resonant period, where the resonant period is defined as the reciprocal of the resonant frequency, ΔT is the change in the temperature of said fluid from a predetermined reference temperature, f (x) is one of two functions, one of said functions being constant, the other of said functions being f (ΔT) where f (ΔT) = 1 - α d Δ T and α d is the temperature coefficient of the volume of said fluid.
Claim 4
Dependent Claim
176 words
A vibration densitometer comprising: a structure mounted for immersion in a fluid; a strain gage bonded to said structure; first means connected from said strain gage to vibrate said structure at its resonant frequency f; second means connected from said first means for producing an output signal at said resonant frequency; and third means connected from said strain gage and said second means for producing an output directly proportional to the density d of said fluid where ##EQU8## A and B are calibration constants, K is one of the numbers + 1 and - 1, α t is the temperature coefficient of resonant period, where the resonant period is defined as the reciprocal of the resonant frequency, ΔT is the change in the temperature of said fluid from a predetermined reference temperature, f (x) is one of two functions, one of said functions being constant, the other of said functions being f (ΔT) where f (ΔT) = 1 - α d Δ T and α d is the temperature coefficient of the volume of said fluid.
Claim 5
Dependent Claim
194 words
A vibration densitometer comprising: a structure mounted for immersion in a fluid; a strain gage bonded to said structure; first means connected from said strain gage to vibrate said structure at its resonant frequency f; second means connected from said first means for producing an output signal at said resonant frequency; and third means connected from said strain gage and said second means for producing an output directly proportional to the density d of said fluid where ##EQU9## A and B are calibration constants, α d is the temperature coefficient of volume of said fluid, ΔT is the change in the temperature of said fluid from a predetermined reference temperature, and f (y) is one of first, second and third functions, said first function being a constant, said second and third functions being f a (ΔT) and f b (ΔT), respectively, where f.sub.a (ΔT) = [1 + Kα.sub.t ΔT].sup.2 and K is one of the numbers + 1 and - 1, and α t is the temperature coefficient of the resonant period where the resonant period is defined as the reciprocal of the resonant frequency, and where f.sub.b (ΔT) = [1 + 2Kα.sub.t ΔT].
Claim 6
Dependent Claim
194 words
A vibration densitometer comprising: a structure mounted for immersion in a fluid; a strain gage bonded to said structure; first means connected from said strain gage to vibrate said structure at its resonant frequency f; second means connected from said first means for producing an output signal at said resonant frequency; and third means connected from said strain gage and said second means for producing an output directly proportional to the density d of said fluid where ##EQU9## A and B are calibration constants, α d is the temperature coefficient of volume of said fluid, ΔT is the change in the temperature of said fluid from a predetermined reference temperature, and f (y) is one of first, second and third functions, said first function being a constant, said second and third functions being f a (ΔT) and f b (ΔT), respectively, where f.sub.a (ΔT) = [1 + Kα.sub.t ΔT].sup.2 and K is one of the numbers + 1 and - 1, and α t is the temperature coefficient of the resonant period where the resonant period is defined as the reciprocal of the resonant frequency, and where f.sub.b (ΔT) = [1 + 2Kα.sub.t ΔT].
Claim 7
Dependent Claim
78 words
a vibration densitometer comprising: a structure mounted for immersion in a fluid; a strain gage bonded to said structure; first means connected from said strain gage to vibrate said structure at its resonant frequency f; second means connected from said first means for producing an output signal at said resonant frequency; utilization means connected from said second means; and third means connected from said strain gage for producing an output directly proportional to the temperature of said fluid.
Claim 8
Dependent Claim
78 words
a vibration densitometer comprising: a structure mounted for immersion in a fluid; a strain gage bonded to said structure; first means connected from said strain gage to vibrate said structure at its resonant frequency f; second means connected from said first means for producing an output signal at said resonant frequency; utilization means connected from said second means; and third means connected from said strain gage for producing an output directly proportional to the temperature of said fluid.
Claim 9
Dependent Claim
26 words
The invention as defined in claim 4, wherein said utilization means includes electrical means for producing an output directly proportional to the density of the fluid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |