US3769831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Densitometer
Assignee: TDK Micronas GmbH
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Filing: 1971-10-13
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Granted: 1973-11-06
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Expires: 1991-10-13
Abstract
Abstract A vibration densitometer having means for producing an output signal which is a pulse train of a pulse repetition frequency that is the function of the density of a fluid in which a densitometer probe is immersed. The densitometer has a linearization circuit which is exceptionally accurate for both liquid and gas density measurement or the like, the linearization circuit producing an output voltage Eoo given by the equation Eoo AT2 + CT + B, where A, B and C are constants, and T is the reciprocal of the pulse repetition frequency.
Inventors
- 👤 G Schiatter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:03
CPC Classifications
G; G01; G01N; G01N9/00; G01N9/002; G01N2009/008
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
229 words
A device whose response is functionally dependent upon density, said device comprising: support means; a body mounted on said support means in a position to be vibrated within a fluid; a driver mounted on said support means and actuable to vibrate said body, said driver including electrical means; detector means mounted adjacent said body to produce an alternating output signal of a frequency equal to a resonant frequency, f, at which said body is vibrating; feedback means connected from said detector to said electrical means to sustain the vibration of said body at the said frequency of vibration thereof; output means connected from said feedback means for producing a series of output pulses at a pulse repetition frequency directly proportional to f; first means responsive to the output signal of said output means for producing an output signal of a magnitude directly proportional to T, where T 1/f; second means responsive to the output signal of said output means for producing an output signal of a magnitude directly proportional to T2; source means for producing an output signal of a constant magnitude; and an adder connected from said first, second and source means to receive all of the said output signals thereof for producing a composite output signal from said adder of a magnitude, Eoo, where Eoo AT2 + CT + B and A, B and C are constants.
Claim 2
Independent Claim
229 words
A device whose response is functionally dependent upon density, said device comprising: support means; a body mounted on said support means in a position to be vibrated within a fluid; a driver mounted on said support means and actuable to vibrate said body, said driver including electrical means; detector means mounted adjacent said body to produce an alternating output signal of a frequency equal to a resonant frequency, f, at which said body is vibrating; feedback means connected from said detector to said electrical means to sustain the vibration of said body at the said frequency of vibration thereof; output means connected from said feedback means for producing a series of output pulses at a pulse repetition frequency directly proportional to f; first means responsive to the output signal of said output means for producing an output signal of a magnitude directly proportional to T, where T 1/f; second means responsive to the output signal of said output means for producing an output signal of a magnitude directly proportional to T2; source means for producing an output signal of a constant magnitude; and an adder connected from said first, second and source means to receive all of the said output signals thereof for producing a composite output signal from said adder of a magnitude, Eoo, where Eoo AT2 + CT + B and A, B and C are constants.
Claim 3
Dependent Claim
31 words
The invention as defined in claim 6, including utilization means connected from said adder to receive said composite output signal, said utilization means indicating the magnitude of said composite output signal.
Claim 4
Dependent Claim
27 words
The invention as defined in claim 2, wherein said utilization means includes an electrical meter calibrated in the density of said fluid to indicate the same visually.
Claim 5
Independent Claim
179 words
A device whose response is functionally dependent upon density, said device comprising: support means; a body mounted on said support means in a position to be vibrated within a fluid; a driver mounted on said support means and actuable to vibrate said body, said driver including electrical means; detector means mounted adjacent said body to produce an alternating output signal of a frequency equal to a resonant frequency, f, at which said body is vibrating; feedback means connected from said detector to said electrical means to sustain the vibration of said body at the said frequency of vibration thereof; output means cOnnected from said feedback means for producing a series of output pulses at a pulse repetition frequency directly proportional to f, said output means output pulses having a pulse width directly proportional to T, where T 1/f; a first source of constant potential Eo; a first integrator connected from said output means and said first source to receive said output means output pulses and said potential Eo for producing an output signal at a magnitude directly proportional to
Claim 6
Independent Claim
179 words
A device whose response is functionally dependent upon density, said device comprising: support means; a body mounted on said support means in a position to be vibrated within a fluid; a driver mounted on said support means and actuable to vibrate said body, said driver including electrical means; detector means mounted adjacent said body to produce an alternating output signal of a frequency equal to a resonant frequency, f, at which said body is vibrating; feedback means connected from said detector to said electrical means to sustain the vibration of said body at the said frequency of vibration thereof; output means cOnnected from said feedback means for producing a series of output pulses at a pulse repetition frequency directly proportional to f, said output means output pulses having a pulse width directly proportional to T, where T 1/f; a first source of constant potential Eo; a first integrator connected from said output means and said first source to receive said output means output pulses and said potential Eo for producing an output signal at a magnitude directly proportional to
Claim 7
Dependent Claim
31 words
The invention as defined in claim 4, including utilization means connected from said adder to receive said composite output signal, said utilization means indicating the magnitude of said composite output signal.
Claim 8
Dependent Claim
27 words
The invention as defined in claim 5, wherein said utilization means includes an electrical meter calibrated in the density of said fluid to indicate the same visually.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |