Patent US3828607A successfully refreshed from Google Patents.
US3828607A
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Phase lock detection and control for piezoelectric fluid analyzers
Assignee: EIDP Inc
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Filing: 1973-01-24
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Granted: 1974-08-13
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Expires: 1993-01-24
Abstract
Abstract Phase lock detector for an analyzer employing piezoelectric elements in electrical circuits. In general the piezoelectric elements differentially absorb a particular constituent in an analyzed fluid. This weight change of the crystal induces a change in the oscillator circuit containing this piezoelectric element. A phase detector detects the resultant phase change between the electrical circuits containing the piezoelectric elements, and provides a measurement of the amount of the particular substance sorbed and, thus, within the fluid. The phase detector output also feeds back to one or more of the electrical circuits and forces them to oscillate at the same frequency.
Inventors
- 👤 D Janzen
- 👤 C Dell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:46
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/36; G01N29/02; G01N29/024; G01N29/22; G01N29/30; G01N29/34; G01N2291/00; G01N2291/01; G01N2291/012
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
241 words
In an analyzer of the type employing: first and second detection devices, including piezoelectric elements which interact differently with a sample fluid; frequency determining networks for controlling the oscillations of said first and second detection devices; and comparison means to determine the difference between the oscillation of the first and second detection devices so that the effEct on the detection devices, and therefore the amount, of at least one component of the sample fluid can be determined, the improvement wherein: a. said comparison means comprises a phase-frequency detecting means to detect any difference between the frequency and phase of oscillation of said first and second detection devices and to generate a signal characteristic of that difference; b. at least one of said frequency determining networks comprises: 1. frequency responding means operatively coupled to said phase-frequency detecting means to change the oscillating frequency of the detection device associated with that frequency detecting network until the oscillating frequencies of said first and second detection devices are substantially equal; and 2. phase responding means operatively coupled to said phasefrequency detecting means to change the oscillating phase of the detection device associated with that frequency determining network until the phase difference between the oscillators of said first and second detection devices approach a predetermined value; and c. said comparison means further comprises means to determine the signal required to keep the oscillations in the first and second device within the predetermined value of one another.
Claim 2
Dependent Claim
241 words
In an analyzer of the type employing: first and second detection devices, including piezoelectric elements which interact differently with a sample fluid; frequency determining networks for controlling the oscillations of said first and second detection devices; and comparison means to determine the difference between the oscillation of the first and second detection devices so that the effEct on the detection devices, and therefore the amount, of at least one component of the sample fluid can be determined, the improvement wherein: a. said comparison means comprises a phase-frequency detecting means to detect any difference between the frequency and phase of oscillation of said first and second detection devices and to generate a signal characteristic of that difference; b. at least one of said frequency determining networks comprises: 1. frequency responding means operatively coupled to said phase-frequency detecting means to change the oscillating frequency of the detection device associated with that frequency detecting network until the oscillating frequencies of said first and second detection devices are substantially equal; and 2. phase responding means operatively coupled to said phasefrequency detecting means to change the oscillating phase of the detection device associated with that frequency determining network until the phase difference between the oscillators of said first and second detection devices approach a predetermined value; and c. said comparison means further comprises means to determine the signal required to keep the oscillations in the first and second device within the predetermined value of one another.
Claim 3
Dependent Claim
44 words
The analyzer of claim 1 wherein said frequency responding means and said phase responding means comprise a single phase-frequency responding circuit capable of changing the oscillation of one of said detection devices until its frequency and phase match that of the other detection device.
Claim 4
Dependent Claim
73 words
phase responding means operatively coupled to said phase-frequency detecting means to change the oscillating phase of the detection device associated with that frequency determining network until the phase difference between the oscillators of said first and second detection devices approach a predetermined value; and c. said comparison means further comprises means to determine the signal required to keep the oscillations in the first and second device within the predetermined value of one another.
Claim 5
Dependent Claim
73 words
phase responding means operatively coupled to said phase-frequency detecting means to change the oscillating phase of the detection device associated with that frequency determining network until the phase difference between the oscillators of said first and second detection devices approach a predetermined value; and c. said comparison means further comprises means to determine the signal required to keep the oscillations in the first and second device within the predetermined value of one another.
Claim 6
Dependent Claim
28 words
The analyzer of claim 2 wherein the signal generated by said phase-frequency detecting means is a d.c. voltage and said phase-frequency responding circuit include a voltage variable capacitor.
Claim 7
Dependent Claim
67 words
The analyzer of claim 1 wherein one of said detection means further comprises, as a feedback circuit, a separate oscillating circuit, the output of which is mixed with the output of one of said frequency determining networks to form a mixed output which is applied to said phase-frequency detecting means, and wherein the signal generated by said phase-frequency responding circuit is applied to said separate oscillating circuit.
Claim 8
Dependent Claim
73 words
The analyzer of claim 1 wherein said phase-frequency detecting means comprises: a phase frequency detector, which produces a substantially digital output; a charge pump, coupled to said phase-frequency detector, for converting said substantially digital output into pulses of specified d.c. potentials; integrating means, coupled to said charge pump, for integrating said pulses of d.c. potential into a d.c. signal; and a d.c. amplifier, coupled to said integrating means, for amplifying said d.c. signal.
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |