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1. WO2011007315 - A SYSTEM AND METHOD FOR MEASURING A RESONANCE FREQUENCY OF A TUBE

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[ EN ]

CLAIMS:

1. A system for measuring a resonance frequency of a tube, the system comprising:

- an oscillating unit (21) for oscillating the tube at a plurality of oscillation frequencies, respectively;

- a detecting unit (22) for detecting a time delay of transmitting a pressure pulse from a first position to a second position in the tube when the tube is oscillated at each oscillation frequency, wherein, when the tube is oscillated at each oscillation frequency in a specific oscillation frequency range of the plurality of oscillation frequencies, the detecting unit detects a variation of the time delay;

- a determining unit (23) for determining a maximal variation of the time delay when the tube is oscillated at the oscillation frequencies in the specific oscillation frequency range;

and

- an indicating unit (24) for indicating an oscillation frequency corresponding to the maximal variation of the time delay, being a resonance frequency of the tube.

2. A system as claimed in claim 1, further comprising a comparing unit for comparing the resonance frequency with a pre-defined frequency table to determine a property/a set of properties of the tube.

3. A system as claimed in claim 1, further comprising a calculating unit for calculating a property/a set of properties of the tube based on the resonance frequency.

4. A system as claimed in claim 1, further comprising an assisting unit for assisting cough, based on the resonance frequency, if the tube is an airway.

5. A system as claimed in claim 1, further comprising an exciting unit for exciting the tube to generate the pressure pulse, if the tube is an airway.

6. A system as claimed in claim 1, wherein the pressure pulse is generated by exciting the tube based on a contraction of a heart, if the tube is a blood vessel.

7. A system as claimed in claim 1, wherein the indicating unit (24) is intended to indicate the resonance frequency by character information, a graph, a light, a voice, or a warning, or to store the resonance frequency in a memory.

8. A method of measuring a resonance frequency of a tube, the method comprising the steps of:

- oscillating (71) the tube at a plurality of oscillation frequencies, respectively;

- detecting (72) a time delay of transmitting a pressure pulse from a first position to a second position in the tube when the tube is oscillated at each oscillation frequency, wherein, when the tube is oscillated at each oscillation frequency in a specific oscillation frequency range of the plurality of oscillation frequencies, the detecting step (72) detects a variation of the time delay;

- determining (73) a maximal variation of the time delay when the tube is oscillated at the oscillation frequencies in the specific oscillation frequency range;

and

- indicating (74) an oscillation frequency corresponding to the maximal variation of the time delay, being a resonance frequency of the tube.

9. A method as claimed in claim 8, further comprising a step of comparing the resonance frequency with a pre-defined frequency table to determine a property/a set of properties of the tube.

10. A method as claimed in claim 8, further comprising a step of calculating a property/a set of properties of the tube based on the resonance frequency.

11. A method as claimed in claim 8, further comprising a step of assisting cough based on the resonance frequency, if the tube is an airway.

12. A method as claimed in claim 8, further comprising a step of exciting the tube to generate the pressure pulse if the tube is an airway.

13. A method as claimed in claim 8, wherein the pressure pulse is generated by exciting the tube based on a contraction of a heart, if the tube is a blood vessel.

14. A system for measuring at least one resonance frequency of a tube, the system comprising:

- an oscillating unit (21) for oscillating the tube at a plurality of oscillation frequencies, respectively;

- a detecting unit (22) for detecting a time delay of transmitting a pressure pulse from a first position to a second position in the tube when the tube is oscillated at each oscillation frequency;

and

- an indicating unit (24) for outputting a graph to reflect a correlation between the plurality of oscillation frequencies and the time delays, wherein, in at least one specific oscillation frequency range of the plurality of oscillation frequencies, each oscillation frequency corresponds to a variation of the time delay, and, in the at least one specific oscillation frequency range, an oscillation frequency corresponding to a maximal variation of the time delay is the at least one resonance frequency of the tube.

15. A method of measuring at least one resonance frequency of a tube, the method comprising:

- oscillating (71) for oscillating the tube at a plurality of oscillation frequencies, respectively;

- detecting (72) a time delay of transmitting a pressure pulse from a first position to a second position in the tube when the tube is oscillated at each oscillation frequency;

and

- indicating (74) to output a graph to reflect a correlation between the plurality of oscillation frequencies and the time delays, wherein, in at least one specific oscillation frequency range of the plurality of oscillation frequencies, each oscillation frequency corresponds to a variation of the time delay, and, in the at least one specific oscillation frequency range, an oscillation frequency corresponding to a maximal variation of the time delay is the at least one resonance frequency of the tube.