US3596190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detection of the rate of change of an electric voltage
Assignee: Elster Metering Holdings Ltd
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Filing: 1968-02-21
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Granted: 1971-07-27
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Expires: 1988-02-21
Abstract
Abstract A device for detecting the slope of a variable electric signal by periodically sampling the signal, which may be obtained for example from a gas chromatograph is operated so that the sampling frequency is varied in a predetermined way with time in accordance with the expected variation of the signal. The slope detecting device can thus be operated with optimum sensitivity and speed of response over an entire chromatograph spectrum. Control of the device can be effected by apparatus providing a control signal of a frequency varied in steps or continuously.
Inventors
- 👤 Richard Carlile Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:20
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/86; G01N30/8624; G01R; G01R19/00; G01R19/12; G01N30/8627
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
108 words
A method of detecting the slope of a variable signal consisting of a series of pulses of varying form which includes providing a preselected sampling program which includes a plurality of sequential sampling sequences of different frequencies, arranging said sampling sequences in accordance with an expected form of said variable signal to provide a frequency range appropriate to the expected change of slope of the variable signal, sampling said variable signal at rates determined by said preselected sampling program to vary the sampling speed of response during sampling in accordance therewith and detecting the peak or trough points of said variable signal as a result of said sampling.
Claim 2
Independent Claim
108 words
A method of detecting the slope of a variable signal consisting of a series of pulses of varying form which includes providing a preselected sampling program which includes a plurality of sequential sampling sequences of different frequencies, arranging said sampling sequences in accordance with an expected form of said variable signal to provide a frequency range appropriate to the expected change of slope of the variable signal, sampling said variable signal at rates determined by said preselected sampling program to vary the sampling speed of response during sampling in accordance therewith and detecting the peak or trough points of said variable signal as a result of said sampling.
Claim 3
Dependent Claim
24 words
The method of claim 1 which includes arranging said sampling sequences to decrease the sampling speed of response in one or more successive steps.
Claim 4
Dependent Claim
30 words
The method of claim 2 in which the sampling time during which each sampling sequence is employed to control sampling of the variable signal increases as the sampling speed decreases.
Claim 5
Dependent Claim
27 words
The method of claim 1 in which said sampling sequences are arranged to provide a uniformly decreasing sampling frequency to continuously decrease the sampling speed of response.
Claim 6
Independent Claim
197 words
A device for detecting the slope of a variable signal consisting of a series of pulses of varying form comprising slope detecting means for receiving said variable signal and periodically sampling said variable signal to detect the peaks or troughs thereof, said detecting means operating to provide an output signal indicative of the occurrence of a peak or trough in said variable input signal, and control means connected to said detecting means and operative to vary the sampling speed of response of said detecting means during the sampling of said variable signal in accordance with an expected form of said variable signal, said control means including means for providing a plurality of constant frequency signals, each constant frequency signal being of a frequency which is different from that of the remaining constant frequency signals, sequencing means to receive said constant frequency signals, said sequencing means operating to sequentially provide individual ones of said constant frequency signals to said detecting means to control the sampling speed of response thereof, and timing means connected to said sequencing means and operative to control the time sequence during which constant frequency signals of any frequency are provided to said detecting means.
Claim 7
Independent Claim
197 words
A device for detecting the slope of a variable signal consisting of a series of pulses of varying form comprising slope detecting means for receiving said variable signal and periodically sampling said variable signal to detect the peaks or troughs thereof, said detecting means operating to provide an output signal indicative of the occurrence of a peak or trough in said variable input signal, and control means connected to said detecting means and operative to vary the sampling speed of response of said detecting means during the sampling of said variable signal in accordance with an expected form of said variable signal, said control means including means for providing a plurality of constant frequency signals, each constant frequency signal being of a frequency which is different from that of the remaining constant frequency signals, sequencing means to receive said constant frequency signals, said sequencing means operating to sequentially provide individual ones of said constant frequency signals to said detecting means to control the sampling speed of response thereof, and timing means connected to said sequencing means and operative to control the time sequence during which constant frequency signals of any frequency are provided to said detecting means.
Claim 8
Dependent Claim
61 words
The device of claim 5 wherein said sequencing means operates to provide constant frequency signals in successive steps, said constant frequency signals decreasing in frequency with each successive step to decrease the sampling speed of response of said detecting means and said timing means operates to increase the sampling Time of each successive step over that of the next preceding step.
Claim 9
Dependent Claim
86 words
The device of claim 6 wherein said sequencing means includes a plurality of AND gates, each AND gate being connected to receive one of said constant frequency signals and a trigger circuit means having a plurality of outputs each connected to a respective one of said AND gates, said timing mans operating to apply clock pulses to said trigger circuit means at predetermined intervals to cause said trigger circuit means to enable each of said AND gates in turn to transmit a different constant frequency signal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |