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US5214388A
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Phase discriminating capacitive array sensor system
Assignee: United States, AS REPRSENTED BY NASA
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Filing: 1992-05-28
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Granted: 1993-05-25
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Expires: 2012-05-28
Abstract
Abstract A phase discriminating capacitive sensor array system which provides multiple sensor elements which are maintained at a phase and amplitude based on a frequency reference provided by a single frequency stabilized oscillator. Sensor signals provided by the multiple sensor elements are controlled by multiple phase control units, which correspond to the multiple sensor elements, to adjust the sensor signals from the multiple sensor elements based on the frequency reference. The adjustment made to the sensor signals is indicated by output signals which indicate the proximity of the object. The output signals may also indicate the closing speed of the object based on the rate of change of the adjustment made, and the edges of the object based on a sudden decrease in the adjustment made.
Inventors
- 👤 John M. Vranish
- 👤 Wadi Rahim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:59
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/24; G01D5/2405; H; H03; H03K; H03K17/00; H03K17/94; H03K17/945; H03K17/955; H03K17/96; H03K17/962; H03K17/9622
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
72 words
A phase discriminating capacitive sensor array system for detecting an object, comprising: (a) a capacitive sensor array having sensor elements to sense the object, each sensor element producing a sensor signal; (b) a frequency stabilized oscillator providing a frequency reference; and (c) phase control means for controlling a phase and amplitude of each sensor signal, and adjusting each sensor signal to correspond to the frequency reference provided by said frequency stabilized oscillator.
Claim 2
Dependent Claim
72 words
A phase discriminating capacitive sensor array system for detecting an object, comprising: (a) a capacitive sensor array having sensor elements to sense the object, each sensor element producing a sensor signal; (b) a frequency stabilized oscillator providing a frequency reference; and (c) phase control means for controlling a phase and amplitude of each sensor signal, and adjusting each sensor signal to correspond to the frequency reference provided by said frequency stabilized oscillator.
Claim 3
Dependent Claim
41 words
A phase discriminating capacitive sensor array system according to claim 1, wherein said phase control means produces an output signal indicating a proximity of the object based on the adjustment made to each said sensor signal by said phase control means.
Claim 4
Dependent Claim
39 words
A phase discriminating capacitive sensor array system according to claim 1, wherein said phase control means produces an output signal indicating an edge of the object based on a sudden decrease in the adjustment made to the sensor signal.
Claim 5
Dependent Claim
26 words
A phase discriminating capacitive sensor array system according to claim 1, wherein said capacitive sensor array comprises a shield on which said sensor elements are provided.
Claim 6
Dependent Claim
102 words
A phase discriminating capacitive sensor array system for detecting an object, comprising: (a) a capacitive sensor array having sensor elements to sense the object, each sensor element producing a sensor signal; (b) a frequency stabilized oscillator providing a frequency reference; and (c) a phase control means for controlling a phase and amplitude of each sensor signal, and adjusting each sensor signal to correspond to the frequency reference provided by said frequency stabilized oscillator; said phase control means producing an output signal indicating a closing speed of the object based on a rate of change of the adjustment made to the sensor signal.
Claim 7
Dependent Claim
102 words
A phase discriminating capacitive sensor array system for detecting an object, comprising: (a) a capacitive sensor array having sensor elements to sense the object, each sensor element producing a sensor signal; (b) a frequency stabilized oscillator providing a frequency reference; and (c) a phase control means for controlling a phase and amplitude of each sensor signal, and adjusting each sensor signal to correspond to the frequency reference provided by said frequency stabilized oscillator; said phase control means producing an output signal indicating a closing speed of the object based on a rate of change of the adjustment made to the sensor signal.
Claim 8
Independent Claim
65 words
A method of detecting an object, comprising the steps of: (a) sensing the object with multiple sensor elements and producing a sensor signal for each of the sensor elements; (b) providing a common frequency reference for each of the sensor elements; and (c) adjusting the phase and amplitude of the sensor signal from each of the sensor elements to correspond to the common frequency reference.
Claim 9
Independent Claim
65 words
A method of detecting an object, comprising the steps of: (a) sensing the object with multiple sensor elements and producing a sensor signal for each of the sensor elements; (b) providing a common frequency reference for each of the sensor elements; and (c) adjusting the phase and amplitude of the sensor signal from each of the sensor elements to correspond to the common frequency reference.
Claim 10
Dependent Claim
32 words
A method according to claim 6, further comprising the step of (d) producing an output signal indicating a proximity of the object based on the adjustment made to each said sensor signal.
Claim 11
Dependent Claim
35 words
A method according to claim 6, further comprising the step of: (d) producing an output signal indicating an edge of the object based on a sudden decrease in the adjustment made to the sensor signal.
Claim 12
Dependent Claim
53 words
A method according to claim 6, wherein step (c) comprises adjusting a voltage indicating initial sensor voltage by a voltage change induced by an amplitude change caused by sensing the object, and adjusting a voltage indicating initial sensor voltage by a voltage change induced by a phase change caused by sensing the object.
Claim 13
Dependent Claim
35 words
A method according to claim 9, wherein step (d) comprises producing an output signal indicating a proximity of the object based on the adjustment made to each said sensor signal based on the adjusted voltage.
Claim 14
Dependent Claim
35 words
A method according to claim 9, wherein step (d) comprises producing an output signal indicating a closing speed of the object based on a rate of change of the adjustment made to the sensor signal.
Claim 15
Dependent Claim
38 words
A method according to claim 9, wherein step (d) comprises producing an output signal indicating an edge of the object based on a sudden decrease in the adjustment made to the sensor signal based on the adjusted voltage.
Claim 16
Independent Claim
91 words
A method of detecting an object, comprising the steps of: (a) sensing the object with multiple sensor elements and producing a sensor signal for each of the sensor elements; (b) providing a common frequency reference for each of the sensor elements; (c) adjusting the phase and amplitude of the sensor signal from each of the sensor elements to correspond to the common frequency reference; and (d) producing an output signal indicating a closing speed of the object based on a rate of change of the adjustment made to the sensor signal.
Claim 17
Independent Claim
91 words
A method of detecting an object, comprising the steps of: (a) sensing the object with multiple sensor elements and producing a sensor signal for each of the sensor elements; (b) providing a common frequency reference for each of the sensor elements; (c) adjusting the phase and amplitude of the sensor signal from each of the sensor elements to correspond to the common frequency reference; and (d) producing an output signal indicating a closing speed of the object based on a rate of change of the adjustment made to the sensor signal.
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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) | 1996-05-24 | 1996-11-23 | 1997-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-24 | 2000-11-23 | 2001-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-24 | 2004-11-23 | 2005-05-25 | $7700.00 | Window Closed / Lapsed |