US3609308A
Expired / Lapsed
US
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Digital measuring systems
Assignee: Lockheed Martin Corp
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Filing: 1968-04-23
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Granted: 1971-09-28
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Expires: 1988-04-23
Abstract
Abstract A system for determining and displaying both positive and negative speed of a rodmeter in relation to surrounding fluid is described. Depending upon whether the direction of movement of the rodmeter is forward or backward, the phase of the output of the rodmeter is either in phase with a reference signal or 180* out of phase with the reference signal. An error signal is generated between the sensed rodmeter signal and a response signal, the latter being generated by the error signal; and in order for the response signal to always be of such a phase with respect to that of the rodmeter signal so as to enable the generation of an error voltage signal proportional to the difference in amplitudes therebetween, a first reference signal is applied to a digital-to-analog converter and a second reference signal 180* therefrom is applied to a summing amplifier coupled to the output of the digital-to-analog converter. The summing amplifier output provides the response signal which changes phase by 180* whenever the phase of the rodmeter signal changes phase by 180*. Digital circuitry is also described which indicates by either analog or digital display the count registered in an up-down counter.
Inventors
- 👤 Stanley G Lemon
- 👤 Charles M Donoho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:56
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/66; H03M1/74; H03M1/742
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
310 words
An electrical system responsive to phase changes in AC signals, comprising: first means responsive to a and to a response signal for generating an error signal characteristic of the difference in amplitudes of said sensEd signal and of said response signal: second means associated with said first means for providing said response signal wherein said response signal maintains a given phase relationship with said sensed signal during periods when said sensed signal is at a first phase angle and also when said senses signal is 180* from said first phase angle, said second means including: AC amplifier means associated with said first means; phase detector means in circuit relationship with said amplifier means; up-down counter means in circuit relationship with said phase detector means; digital-to-analog converter means in circuit relationship with said up-down counter means; a first voltage reference junction coupled to an input of said converter means; a second voltage reference junction coupled to an output of said converter means; voltage summing means in circuit relationship between said converter means and said first means, means associated with said up-down counter means for displaying the information measured by said system from said sensed AC signal, and wherein said display means includes: up counter means; means in circuit relationship with said up counter means for continuously cycling the count thereof; comparator means associated with said up-down counter means and with said up counter means for providing an output signal when the counts on said counter means are equal; first gating means in circuit relationship with said up counter means, said cycling means and said comparator means for passing the output signals from said cycling means for time intervals as determined by said up counter means and said comparator means; and means associated with said first gating means for visually representing the information measured by said system from said sensed AC signal.
Claim 2
Dependent Claim
310 words
An electrical system responsive to phase changes in AC signals, comprising: first means responsive to a and to a response signal for generating an error signal characteristic of the difference in amplitudes of said sensEd signal and of said response signal: second means associated with said first means for providing said response signal wherein said response signal maintains a given phase relationship with said sensed signal during periods when said sensed signal is at a first phase angle and also when said senses signal is 180* from said first phase angle, said second means including: AC amplifier means associated with said first means; phase detector means in circuit relationship with said amplifier means; up-down counter means in circuit relationship with said phase detector means; digital-to-analog converter means in circuit relationship with said up-down counter means; a first voltage reference junction coupled to an input of said converter means; a second voltage reference junction coupled to an output of said converter means; voltage summing means in circuit relationship between said converter means and said first means, means associated with said up-down counter means for displaying the information measured by said system from said sensed AC signal, and wherein said display means includes: up counter means; means in circuit relationship with said up counter means for continuously cycling the count thereof; comparator means associated with said up-down counter means and with said up counter means for providing an output signal when the counts on said counter means are equal; first gating means in circuit relationship with said up counter means, said cycling means and said comparator means for passing the output signals from said cycling means for time intervals as determined by said up counter means and said comparator means; and means associated with said first gating means for visually representing the information measured by said system from said sensed AC signal.
Claim 3
Dependent Claim
39 words
The system of claim 1 further including: second gating means in circuit relationship with said up counter means, said comparator means and said visual representing means for separately indicating the sense of said information on said visual representing means.
Claim 4
Dependent Claim
163 words
An information display system, comprising: a first n-bit counter; a second n-bit counter; means in circuit relationship with said second counter for continuously cycling the count thereof; comparator means associated with said first and second counters for providing an output signal when he counts on said counters bear a predetermined relationship; first gating means in circuit relationship with said second counter, said cycling means and said comparator means for passing from said cycling means during a cycle of said second counter an information signal therefrom representing the count difference between a preselected count in said second counter and a count therein having said predetermined relationship to a count in said first counter; means associated with said first gating means for visually representing the information represented by said information signal, and second gating means in circuit relationship with said second counter, said comparator means and said visual representing means for enabling the indication by said visual representing means of the sense of said information.
Claim 5
Dependent Claim
163 words
An information display system, comprising: a first n-bit counter; a second n-bit counter; means in circuit relationship with said second counter for continuously cycling the count thereof; comparator means associated with said first and second counters for providing an output signal when he counts on said counters bear a predetermined relationship; first gating means in circuit relationship with said second counter, said cycling means and said comparator means for passing from said cycling means during a cycle of said second counter an information signal therefrom representing the count difference between a preselected count in said second counter and a count therein having said predetermined relationship to a count in said first counter; means associated with said first gating means for visually representing the information represented by said information signal, and second gating means in circuit relationship with said second counter, said comparator means and said visual representing means for enabling the indication by said visual representing means of the sense of said information.
Claim 6
Dependent Claim
24 words
The system of claim 3 further including: flip-flop means in circuit relationship with said second counter, said first gating means, and said comparator means.
Claim 7
Dependent Claim
40 words
The system of claim 3 further including: third gating means in circuit relationship between said second counter and said flip-flop means; and fourth gating means in circuit relationship between said third gating means, said comparator means and said flip-flop means.
Claim 8
Dependent Claim
18 words
The system of claim 5 further including: distance indicating means in circuit relationship with said first gating means.
Claim 9
Dependent Claim
22 words
The system of claim 6 further including: scaling divider means in circuit relationship between said cycling means and said first gating means.
Claim 10
Dependent Claim
165 words
An information display system for automatically computing and displaying the magnitude of difference between an actual counter contents and preselected contents thereof, said system comprising: a first n-bit counter for containing said actual counter contents: a second n-bit counter; means in circuit relationship with said second counter for continuously cycling the count thereof; comparator means associated with said first and second counters for providing an output signal when the counts on said counters bear a predetermined relationship; first gating means in circuit relationship with said second counter, with said cycling means and with said comparator means for passing from said cycling means, during a cycle of said second counter, an information signal therefrom representing the count difference between a preselected count in said second counter corresponding to said preselected contents and a count therein having said predetermined relationship to the actual counter contents in said first counter; and means associated with said first gating means for visually representing the information represented by said information signal.
Claim 11
Dependent Claim
165 words
An information display system for automatically computing and displaying the magnitude of difference between an actual counter contents and preselected contents thereof, said system comprising: a first n-bit counter for containing said actual counter contents: a second n-bit counter; means in circuit relationship with said second counter for continuously cycling the count thereof; comparator means associated with said first and second counters for providing an output signal when the counts on said counters bear a predetermined relationship; first gating means in circuit relationship with said second counter, with said cycling means and with said comparator means for passing from said cycling means, during a cycle of said second counter, an information signal therefrom representing the count difference between a preselected count in said second counter corresponding to said preselected contents and a count therein having said predetermined relationship to the actual counter contents in said first counter; and means associated with said first gating means for visually representing the information represented by said information signal.
Claim 12
Dependent Claim
167 words
A digital system for automatically computing and displaying the magnitude of difference between an actual counter contents and a preselected contents thereof, said system including: a first n-bit counter for containing said actual counter contents; a second n-bit counter; means for continuously cycling the second counter; a pulse source for emitting pulses at a predetermined frequency; comparator means for comparing the count in the first and second counters and for generating an output signal when the counts therein bear a predetermined relationship; registration means for registering the number of pulses applied thereto in a given time period; and gating means coupled to the pulse source, the comparator means and the second counter for gating to the registration means, during a cycle of the second counter, a number of pulses from the pulse source representing the count difference between a preselected count in the second counter corresponding to said preselected contents and a count therein having said predetermined relationship to the actual counter contents in the first counter.
Claim 13
Dependent Claim
167 words
A digital system for automatically computing and displaying the magnitude of difference between an actual counter contents and a preselected contents thereof, said system including: a first n-bit counter for containing said actual counter contents; a second n-bit counter; means for continuously cycling the second counter; a pulse source for emitting pulses at a predetermined frequency; comparator means for comparing the count in the first and second counters and for generating an output signal when the counts therein bear a predetermined relationship; registration means for registering the number of pulses applied thereto in a given time period; and gating means coupled to the pulse source, the comparator means and the second counter for gating to the registration means, during a cycle of the second counter, a number of pulses from the pulse source representing the count difference between a preselected count in the second counter corresponding to said preselected contents and a count therein having said predetermined relationship to the actual counter contents in the first counter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |