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US3741655A
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Means for determining the existence of an object within a predetermined range interval
Assignee: Qualimetrics Inc
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Filing: 1971-12-09
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Granted: 1973-06-26
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Expires: 1991-12-09
Abstract
Abstract A signal-detector which detects whether or not an object exists at a predetermined distance comprises a detector unit and an evaluation device which operates with a first and second group of one or more time gaps, in which the first group comprises a first time gap arranged to coincide with the duration of at least a part of an expected and known signal and the second group of time gaps comprises a second time gap spaced from said first time gap and the magnitudes corresponding to the signals obtained during the time gaps are arranged to be compared in the evaluating device whereby an output signal from said device gives information as to whether an object exists or not.
Inventors
- 👤 B Ling
- 👤 A Persson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:24
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/10; G01S13/18; G01S13/103; G01S13/88; G01S13/95; G01S17/00; G01S17/02; G01S17/06; G01S17/08; G01S17/10; G01S17/18; G01S17/88; G01S17/95; G01S7/00; G01S7/02; G01S7/28; G01S7/285; G01S7/292; G01S7/2923; G01S7/2926; Y; Y02; Y02A; Y02A90/00; Y02A90/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
261 words
Means for determining the existence of an object within a predetermined range interval, said means including: a signal transmitting means for transmitting signal pulses, a detecting means for receiving echo signal pulses originating from said transmitted signal pulses, first and second evaluating means connectable to said detecting means for evaluating the power of the incident signal pulses, control devices for connecting said first evaluating means to said detecting means during a first time interval and for connecting said second evaluating means to said detecting means during a second time interval, comparing means connected to said first and second evaluating means to determine the difference between the power of the signal pulses evaluated by the first evaluating means and the power of the signal pulses evaluated by the second evaluating means, a level-sensing means connectable to said comparing means, said first time interval wholly or partly coinciding with said range interval and said second time interval being separated from said first time interval, and the first and second time intervals being close to each other and substantially of the same length, a control device connecting said comparing means to said level-sensing means after transmission of a substantial number of signal pulses by said transmitting means when echo signal pulses originating from said transmitted signal pulses should have reached said reciever if there is an object in said pre-determined range, said level-sensing means, if the contents of said comparing means exceeds a pre-determined level, generating an output signal, and such output signal indicating the existence of an object in said pre-determined range interval.
Claim 2
Dependent Claim
261 words
Means for determining the existence of an object within a predetermined range interval, said means including: a signal transmitting means for transmitting signal pulses, a detecting means for receiving echo signal pulses originating from said transmitted signal pulses, first and second evaluating means connectable to said detecting means for evaluating the power of the incident signal pulses, control devices for connecting said first evaluating means to said detecting means during a first time interval and for connecting said second evaluating means to said detecting means during a second time interval, comparing means connected to said first and second evaluating means to determine the difference between the power of the signal pulses evaluated by the first evaluating means and the power of the signal pulses evaluated by the second evaluating means, a level-sensing means connectable to said comparing means, said first time interval wholly or partly coinciding with said range interval and said second time interval being separated from said first time interval, and the first and second time intervals being close to each other and substantially of the same length, a control device connecting said comparing means to said level-sensing means after transmission of a substantial number of signal pulses by said transmitting means when echo signal pulses originating from said transmitted signal pulses should have reached said reciever if there is an object in said pre-determined range, said level-sensing means, if the contents of said comparing means exceeds a pre-determined level, generating an output signal, and such output signal indicating the existence of an object in said pre-determined range interval.
Claim 3
Dependent Claim
261 words
Means for determining the existence of an object within a predetermined range interval, said means including: a signal transmitting means for transmitting signal pulses, a detecting means for receiving echo signal pulses originating from said transmitted signal pulses, first and second evaluating means connectable to said detecting means for evaluating the power of the incident signal pulses, control devices for connecting said first evaluating means to said detecting means during a first time interval and for connecting said second evaluating means to said detecting means during a second time interval, comparing means connected to said first and second evaluating means to determine the ratio between the power of the signal pulses evaluated by the first evaluating means and the power of the signal pulses evaluated by the second evaluating means, a level-sensing means connectable to said comparing means, said first time interval wholly or partly coinciding with said range interval and said second time interval being separated from said first time interval, and the first and second time intervals being close to each other and substantially of the same length, a control device connecting said comparing means to said level-sensing means after transmission of a substantial number of signal pulses by said transmitting means when echo signal pulses originating from said transmittal signal pulses should have reached said reciever if there is an object in said pre-determined range, said level-sensing means, if the contents of said comparing means exceeds a pre-determined level, generating an output signal, and such output signal indicating the existence of an object in said pre-Determined range interval.
Claim 4
Dependent Claim
261 words
Means for determining the existence of an object within a predetermined range interval, said means including: a signal transmitting means for transmitting signal pulses, a detecting means for receiving echo signal pulses originating from said transmitted signal pulses, first and second evaluating means connectable to said detecting means for evaluating the power of the incident signal pulses, control devices for connecting said first evaluating means to said detecting means during a first time interval and for connecting said second evaluating means to said detecting means during a second time interval, comparing means connected to said first and second evaluating means to determine the ratio between the power of the signal pulses evaluated by the first evaluating means and the power of the signal pulses evaluated by the second evaluating means, a level-sensing means connectable to said comparing means, said first time interval wholly or partly coinciding with said range interval and said second time interval being separated from said first time interval, and the first and second time intervals being close to each other and substantially of the same length, a control device connecting said comparing means to said level-sensing means after transmission of a substantial number of signal pulses by said transmitting means when echo signal pulses originating from said transmittal signal pulses should have reached said reciever if there is an object in said pre-determined range, said level-sensing means, if the contents of said comparing means exceeds a pre-determined level, generating an output signal, and such output signal indicating the existence of an object in said pre-Determined range interval.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |