Methods and systems are described for a system for obtaining information regarding a flow. These methods and systems comprise a signal generator configured to generate an alternating current signal at a carrier frequency and a transformer arranged to receive the generated signal, wherein the transfo
Methods and systems are described for a system for obtaining information regarding a flow. These methods and systems comprise a signal generator configured to generate an alternating current signal at a carrier frequency and a transformer arranged to receive the generated signal, wherein the transformer and carrier frequency are selected so that the generated signal resonates at the carrier frequency. The alternating signal is then used to cause plasma to form across a gap between two electrodes, wherein the voltage drop across the gap is directly proportional to the flow's velocity. This voltage may then be measured to determine the flow velocity.
대표청구항▼
What is claimed is: 1. A method for obtaining information regarding a flow passing through a gap between two electrodes, comprising: generating an alternating current signal at a carrier frequency using a signal generation device in combination with a transformer, wherein the carrier frequency is s
What is claimed is: 1. A method for obtaining information regarding a flow passing through a gap between two electrodes, comprising: generating an alternating current signal at a carrier frequency using a signal generation device in combination with a transformer, wherein the carrier frequency is selected so that the generated signal resonates; causing a constant current plasma to form across the gap between the two electrodes using the alternating current signal; measuring a voltage across the electrode gap; and determining the velocity of the flow based on the voltage across the gap. 2. The method of claim 1, wherein the electrodes are coated with a dielectric material. 3. The method of claim 1, wherein the electrodes are manufactured by a process involving chemical etching. 4. The method of claim 1, wherein measuring a voltage across the electrode gap comprises: receiving, using a voltage probe, an amplitude modulated signal transmitted over a wire as a result of the plasma formed across the gap. 5. The method of claim 1, wherein measuring a voltage across the electrode gap comprises: receiving an amplitude modulated signal wirelessly transmitted through electromagnetic waves as a result of the plasma formed across the gap. 6. The method of claim 1, wherein the electrodes are provided on a silicon wafer. 7. The method of claim 1, further comprising: monitoring the plasma; and adjusting one or more parameters of the signal generator based on the monitoring, wherein the one or more parameters include one or more of the carrier frequency and an amplitude of the signal generated by the signal generator. 8. The method of claim 1, wherein the flow is a flow resulting from one or more of the following: a turbine engine, a shock tube, and hypersonic aeronautical travel. 9. The method of claim 1, wherein the transformer is designed to resonate at a frequency of 800 kHz or higher. 10. The method of claim 1, further comprising: causing a constant current plasma to form across a gap between at least a second pair of two electrodes; measuring a voltage across the gap between the at least second pair of electrodes; and determining information regarding the direction of the flow based on the voltage across the gap between the two electrodes and voltage across the gap between the at least second pair of electrodes. 11. The method of claim 1, wherein determining the velocity of the flow comprises: converting the measured voltage from a time domain to a frequency domain; determining the amplitude of the signal in the frequency domain at the carrier frequency; and determining the velocity of the flow using the determined amplitude of the signal at the carrier frequency. 12. The method of claim 11, further comprising: identifying a side lobe of the voltage in the frequency domain; determining the amplitude of the side lobe; determining information regarding the intensity of a disturbance in the flow using the determined amplitude of the side lobe. 13. The method of claim 11, further comprising: identifying a side lobe of the voltage in the frequency domain; determining a center frequency of the side lobe; determining information regarding a periodic frequency of a disturbance in the flow using the determined center frequency of the side lobe. 14. A system for obtaining information regarding a flow, comprising: a signal generator configured to generate an alternating current signal at a carrier frequency; a transformer arranged to receive the generated signal, wherein the transformer and carrier frequency are selected so that the generated signal resonates at the carrier frequency; and an electrode pair comprising a gap between the electrodes; wherein the electrode pair is constructed and arranged to cause plasma to form across the gap in response to the alternating current signal. 15. The system of claim 14, wherein the electrodes are coated with a dielectric material. 16. The system of claim 14, wherein the electrodes are manufactured by a process involving chemical etching. 17. The system of claim 14, further comprising: a voltage probe configured to detect a voltage of the alternating current signal; a signal analysis system connected to the voltage probe; wherein the signal analysis system determines a flow velocity based on the detected voltage. 18. The system of claim 14, further comprising: a receiver configured to receive an amplitude modulated signal transmitted through electromagnetic waves as a result of the plasma formed across the gap; and a signal analysis system connected to the receiver; wherein the signal analysis system determines a flow velocity based on the received signal. 19. The system of claim 14, wherein the electrode pair is provided on a silicon wafer. 20. The system of claim 14, further comprising: a feedback system configured to monitor the plasma and adjust one or more parameters of the signal generator based on the monitoring, wherein the one or more parameters include one or more of the carrier frequency and an amplitude of the signal generated by the signal generator. 21. The system of claim 14, wherein the flow is a flow resulting from one or more of the following: a turbine engine, a shock tube, and hypersonic aeronautical travel. 22. The system of claim 14, wherein the transformer is designed to resonate at a frequency of 800 kHz or higher. 23. The system of claim 14, further comprising: at least a second electrode pair comprising a gap between the electrodes, wherein the electrodes are constructed and arranged to cause plasma to form across the gap; and a processor configured to determine information regarding a voltage drop across the gap for the first electrode pair and a voltage drop across the gap for the second electrode pair and use the voltage drops to determine information regarding a direction of the flow. 24. The system of claim 14, further comprising: a signal analysis system for determining a flow velocity for the flow, wherein the signal analysis system is configured to convert a measured voltage indicative of the voltage across the gap from a time domain to a frequency domain; determine the amplitude of the signal in the frequency domain at the carrier frequency; and determine the velocity of the flow using the determined amplitude of the signal at the carrier frequency. 25. The system of claim 24, wherein the signal analysis system is further configured to identify a side lobe of the voltage in the frequency domain; determine the amplitude of the side lobe; and determine information regarding the intensity of a disturbance in the flow using the determined amplitude of the side lobe. 26. The system of claim 24, wherein the signal analysis system is further configured to identify a side lobe of the voltage in the frequency domain; determine a center frequency of the side lobe; and determine information regarding a periodic frequency of a disturbance in the flow using the determined center frequency of the side lobe. 27. A system for obtaining information regarding a flow, comprising: means for generating an alternating current signal at a carrier frequency in combination with a transformer, wherein the carrier frequency is selected so that the generated signal resonates; means for causing a plasma to form across a gap; means for measuring a voltage across the gap; and means for determining the velocity of the flow based on the voltage across the gap. 28. The system of claim 27, wherein the means for measuring a voltage across the electrode gap comprises: means for receiving an amplitude modulated signal transmitted as a result of the plasma formed across the gap. 29. The system of claim 27, further comprising: means for monitoring the plasma; and means for adjusting one or more parameters of the means for generating an alternating current signal based on the monitoring, wherein the one or more parameters include one or more of the carrier frequency and an amplitude of the signal generated. 30. The system of claim 27, further comprising: means for causing a constant current plasma to form across a gap between at least a second pair of two electrodes; means for measuring a voltage across the gap between the at least second pair of electrodes; and means for determining information regarding the direction of the flow based on the voltage across the gap between the two electrodes and voltage across the gap between the at least second pair of electrodes. 31. The system of claim 27, wherein the means for determining the velocity of the flow comprises: means for converting the measured voltage from a time domain to a frequency domain; means for determining the amplitude of the signal in the frequency domain at the carrier frequency; and means for determining the velocity of the flow using the determined amplitude of the signal at the carrier frequency. 32. The system of claim 31, wherein the means for determining the velocity of the flow further comprises: means for identifying a side lobe of the voltage in the frequency domain; means for determining the amplitude of the side lobe; means for determining information regarding the intensity of a disturbance in the flow using the determined amplitude of the side lobe. 33. The system of claim 31, wherein the means for determining the velocity of the flow further comprises: means for identifying a side lobe of the voltage in the frequency domain; means for determining a center frequency of the side lobe; means for determining information regarding a periodic frequency of a disturbance in the flow using the determined center frequency of the side lobe.
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Sullivan Charles R., Control system for providing power to a gas discharge lamp.
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