US3581238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission transducer for remote measurement
Assignee: TSURUMI SEIKIKOSAKU SHO CO Ltd
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Filing: 1968-09-30
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Granted: 1971-05-25
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Expires: 1988-09-30
Abstract
Abstract A transmission transducer for remote measurement is incorporated in the feedback loop of a double integrator type oscillator. The transducer is adapted to control the frequency of the oscillator corresponding to variations of gains of the transducer. The transducer gain is varied in accordance with variations of measured values which are directly sensed by the transducer.
Inventors
- 👤 Etsujiro Shimemura
- 👤 Masao Iwamiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:57
CPC Classifications
G; G08; G08C; G08C19/00; G08C19/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
158 words
A feedback-type oscillator apparatus for remote measurement comprising: a variable gain transducer, the gain of which is variable in accordance with inputs thereto which correspond to values which are to be remotely measured; a first coefficient adjuster coupled to an output of said variable gain transducer and adapted to adjust the occupied frequency bandwidth of the measurement apparatus; a double integrator coupled to the output of said first coefficient adjuster, said double integrator including serially connected first and second integrator units; a second coefficient adjuster coupling an output of said double integrator to an input of said first integrator unit, said second coefficient adjuster adjusting the center frequency of the measurement apparatus independent of the occupied frequency bandwidth; and a feedback circuit for feeding back an output signal of said double integrator to said variable gain transducer for stabilizing the variations of gain of said variable gain transducer produced by the variations of said values being remotely measured.
Claim 2
Dependent Claim
158 words
A feedback-type oscillator apparatus for remote measurement comprising: a variable gain transducer, the gain of which is variable in accordance with inputs thereto which correspond to values which are to be remotely measured; a first coefficient adjuster coupled to an output of said variable gain transducer and adapted to adjust the occupied frequency bandwidth of the measurement apparatus; a double integrator coupled to the output of said first coefficient adjuster, said double integrator including serially connected first and second integrator units; a second coefficient adjuster coupling an output of said double integrator to an input of said first integrator unit, said second coefficient adjuster adjusting the center frequency of the measurement apparatus independent of the occupied frequency bandwidth; and a feedback circuit for feeding back an output signal of said double integrator to said variable gain transducer for stabilizing the variations of gain of said variable gain transducer produced by the variations of said values being remotely measured.
Claim 3
Dependent Claim
46 words
Apparatus according to claim 1 wherein said first coefficient adjuster includes a series circuit which comprises a resistor coupled to the output of said variable gain transducer connected in series with an operational amplifier, the output of the operational amplifier being coupled to said double integrator.
Claim 4
Dependent Claim
36 words
Apparatus according to claim 1 wherein each of said integrator units included in said double integrator comprises an operational amplifier, a resistor series connected thereto, and a condenser connected in parallel with the respective operational amplifier.
Claim 5
Dependent Claim
30 words
Apparatus according to claim 1 wherein said second coefficient adjuster includes a variable resistor coupling an output from said double integrator to an input terminal of said first integrator unit.
Claim 6
Dependent Claim
30 words
Apparatus according to claim 2 wherein said second coefficient adjuster includes a variable resistor coupling an output from said double integrator to an inPut terminal of said first integrator unit.
Claim 7
Dependent Claim
34 words
Apparatus according to claim 3 wherein said second coefficient adjuster includes a variable resistor coupling an output from said double integrator to an input terminal of the operational amplifier of said first integrator unit.
Claim 8
Dependent Claim
54 words
Apparatus according to claim 3 further comprising: an actuating circuit for facilitating initial oscillation, said actuating circuit including a variable resistor coupled between the output and input terminals of the operational amplifier of said first integrator unit; and an amplitude stabilizing circuit coupled between the terminals of the condenser of said second integrator unit.
References Cited (Backward Citations)
US3396346A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |