Patent US3885140A successfully refreshed from Google Patents.
US3885140A
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Densitometer
Assignee: TDK Micronas GmbH
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Filing: 1974-08-12
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Granted: 1975-05-20
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Expires: 1994-08-12
Abstract
Abstract A vibration densitometer including a closed loop electromechanical oscillator for vibrating a fluid immersible vane. A digital output directly proportional to density is achieved through a unique digital squarer. The densitometer is an all digital system. In the loop, a tracking filter is provided. Separate search and track automatic gain control feedbacks are provided. A threshold detector controls clamps and a gate to cause the voltage controlled oscillator of a first phase lock loop to search or track the vane resonant frequency. The threshold detector also effects the search feedback. A phase adjustment circuit and a second phase lock loop are employed to impress a sine wave voltage component on the vane driver of a phase which creates maximum efficiency.
Inventors
- 👤 Gerald Lance Schlatter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:32
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/60; G06F7/68; G01; G01N; G01N9/00; G01N9/002; G01N2009/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
320 words
Apparatus for producing serial groups of serial pulses wherein the number of pulses in a group is directly proportional to the square of the reciprocal of the fundamental frequency of a periodic wave, said apparatus comprising: a terminal junction; first means having an output lead, said first means supplying a square wave on said output lead thereof, said square wave having a variable pulse repetition frequency and a mark-to-space ratio of unity, said first means output lead being connected to said terminal junction; first and second NAND gates, each of said NAND gates having first and second input leads and an output lead; a burst oscillator having a constant pulse repetition frequency large in comparison to that of said square wave; an inverter having an input lead connected from said terminal junction, and an output lead connected to said second gate first input lead, said first gate first lead being connected from said terminal junction, said burst oscillator having an output lead connected to the second lead of each of said first and second gates; a divider having at least a first input lead, and a plurality of output leads, said divider acting as a counter and having a storage register with a constant count entered therein during alternate half periods of said square wave, pulses counted by said divider being supplied over said first input lead thereof thereto, said divider first input lead being connected from one of said gate output leads; and a rate multiplier having a plurality of setting input leads connected from respective bits in said divider register, said rate multiplier having a serial pulse input lead connected from the other of said gate output leads and a serial pulse output lead, said rate multiplier producing serial groups of serial pulses, the number of pulses in a group being directly proportional to the square of the reciprocal of the pulse repetition frequency of said square wave.
Claim 2
Dependent Claim
320 words
Apparatus for producing serial groups of serial pulses wherein the number of pulses in a group is directly proportional to the square of the reciprocal of the fundamental frequency of a periodic wave, said apparatus comprising: a terminal junction; first means having an output lead, said first means supplying a square wave on said output lead thereof, said square wave having a variable pulse repetition frequency and a mark-to-space ratio of unity, said first means output lead being connected to said terminal junction; first and second NAND gates, each of said NAND gates having first and second input leads and an output lead; a burst oscillator having a constant pulse repetition frequency large in comparison to that of said square wave; an inverter having an input lead connected from said terminal junction, and an output lead connected to said second gate first input lead, said first gate first lead being connected from said terminal junction, said burst oscillator having an output lead connected to the second lead of each of said first and second gates; a divider having at least a first input lead, and a plurality of output leads, said divider acting as a counter and having a storage register with a constant count entered therein during alternate half periods of said square wave, pulses counted by said divider being supplied over said first input lead thereof thereto, said divider first input lead being connected from one of said gate output leads; and a rate multiplier having a plurality of setting input leads connected from respective bits in said divider register, said rate multiplier having a serial pulse input lead connected from the other of said gate output leads and a serial pulse output lead, said rate multiplier producing serial groups of serial pulses, the number of pulses in a group being directly proportional to the square of the reciprocal of the pulse repetition frequency of said square wave.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |