IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0161702
(2002-06-05)
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발명자
/ 주소 |
- Naumiec, Robert
- Smith, Walter
- Han, Fei
- Gleeson, Eamon
- Hedeen, Robert A.
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
2 인용 특허 :
5 |
초록
▼
In one embodiment, the invention is a pressure sensor calibration system comprising a pressure chamber in fluid communication with a pressure sensor to be calibrated, the chamber is pressurized to a static pressure level. An oscillating surface on a wall of the chamber imparts a rapid pressure fluct
In one embodiment, the invention is a pressure sensor calibration system comprising a pressure chamber in fluid communication with a pressure sensor to be calibrated, the chamber is pressurized to a static pressure level. An oscillating surface on a wall of the chamber imparts a rapid pressure fluctuation in the static pressure level of the chamber. These rapid pressure fluctuations in a high-static pressure level chamber are used to calibrate the pressure sensor.
대표청구항
▼
1. A sensor calibration system comprising:a pressure chamber in fluid communication with a sensor to be calibrated, said chamber pressurized to a static pressure level;an oscillating surface on a wall of said chamber, said oscillating surface imparts a rapid pressure fluctuation in the static pressu
1. A sensor calibration system comprising:a pressure chamber in fluid communication with a sensor to be calibrated, said chamber pressurized to a static pressure level;an oscillating surface on a wall of said chamber, said oscillating surface imparts a rapid pressure fluctuation in the static pressure level of said chamber, anda mechanical shaker coupled to the oscillating surface and applying a reciprocating motion to the surface. 2. A sensor calibration system as in claim 1 wherein the shaker applies the reciprocating motion at a selected frequency in a range of about 50 hertz (Hz) to about 3,200 Hz. 3. A method as in claim 1 further comprising a reciprocating piston in the pressure chamber wherein a front surface of the piston is the oscillating surface and the shaker applies the reciprocating motion to the piston. 4. A sensor calibration system as in claim 1 wherein said oscillating surface further comprises a conical section facing said chamber. 5. A sensor calibration system as in claim 1 wherein said oscillating surface further comprises a conical section facing said chamber, and said conical section having a first surface adjacent a probe sensing surface position in the chamber and a second surface adjacent a calibration probe sensing surface position. 6. A sensor calibration system as in claim 1 wherein the oscillating surface is a diaphragm. 7. A sensor calibration system as in claim 1 wherein said chamber is maintained at a static pressure of at least 200 psi. 8. A sensor calibration system as in claim 1 wherein said pressure chamber has a volume no greater than 1.8 inches cubed. 9. A sensor calibration system as in claim 1 wherein said chamber is a first chamber, and the oscillating surface is a diaphragm and a second pressure chamber is on a side of the diaphragm opposite to the first chamber, and the first chamber and the second pressure chamber have equalized static pressure, wherein the mechanical shaker further comprises a shaft extending through the second chamber and is attached to the diaphragm. 10. A sensor calibration system as in claim 9 wherein a speaker in the second pressure chamber emits vibrations that cause the diaphragm to vibrate. 11. A pressure sensor calibration system comprising:a probe holder having a mount for a pressure sensor to be calibrated, said holder having an aperture in fluid communication with a pressure generatorsaid pressure generator having a pressure chamber coupled to a steady source of high pressure gas to pressurize the chamber to a static pressure level,said pressure chamber having an oscillating surface which dynamically varies the static pressure level in the chamber, andsaid oscillating surface is oscillated by a mechanical shaker external to the pressure chamber and comprising reciprocating shaker coupling between the reciprocating shaker and the oscillating surface, wherein the coupling applies a reciprocating motion to the oscillate the surface. 12. A sensor calibration system as in claim 11 wherein the shaker applies the reciprocating motion at a selected frequency in a range of about 50 hertz (Hz) to about 3,200 Hz. 13. A method as in claim 11 further comprising a reciprocating piston in the pressure chamber wherein a front surface of the piston is the oscillating surface and the coupling is a piston rod between the piston and shaker. 14. A calibration system as in claim 11 wherein the oscillating surface is a diaphragm. 15. A calibration system as in claim 11 wherein said pressure chamber is maintained at a static pressure of at least 200 psi. 16. A calibration system as in claim 11 wherein said pressure chamber has a volume no greater than 1.8 inches cubed. 17. A calibration system as in claim 11 wherein said pressure chamber is a first chamber, and the oscillating surface is a diaphragm and a second pressure chamber is on a side of the diaphragm opposite to the first pressure chamber, and the first pressure chamber and the second pressure chamber have equalized static pressure, and wherein said coupling comprises a shaft extending through the second pressure chamber to the diaphragm. 18. A method for calibrating a sensor using a calibration device having a probe holder and pressure generator comprising:a. monitoring the sensor to be calibrated in the probe holder such that the transducer head of the sensor is in fluid communication with a pressure chamber in the pressure generator;b. pressurizing the pressure chamber to a static pressure level,c. mechanically vibrating a surface of the pressure chamber to generate a dynamic pressure fluctuation on the pressure level in the pressure chamber, whereby a mechanical shaker applies reciprocal motion to the surface,d. sensing the pressure level in the pressure chamber, ande. generating a signal by the sensor representing the dynamic pressure fluctuation. 19. A method as in claim 18 wherein the shaker applies the reciprocating motion at a selected frequency in a range of about 50 hertz (Hz) to about 3,200 Hz. 20. A method as in claim 18 wherein the pressure chamber is maintained at a static pressure of at least 200 psi. 21. A method as in claim 18 wherein the vibration is provided by a diaphragm. 22. A sensor calibration system comprising:a pressure chamber in fluid communication with a sensor to be calibrated, said chamber pressurized to a static pressure level;an oscillating surface on a wall of said chamber, said oscillating surface imparts a rapid pressure fluctuation in the static pressure level of said chamber, andwherein said chamber is in thermal communication with a heat source, and said heat source heats the chamber to at least 700° F. 23. A calibration system comprising:a probe holder having a mount for a pressure sensor to be calibrated, said holder having an aperturein fluid communication with a pressure generatorsaid pressure generator having a pressure chamber coupled to a steady source of high pressure gas to pressurize the chamber to a static pressure level,said pressure chamber having an oscillating surface which dynamically varies the static pressure level in the chamber, andsaid oscillating surface is oscillated by a shaker devicewherein said pressure chamber is in thermal communication with a heat source, and said heat source heats the pressure chamber to at least 700° F. 24. A method using a calibration device having a probe holder and pressure generator comprising:a. monitoring the sensor to be calibrated in the probe holder such that the transducer head of the sensor is in fluid communication with a pressure chamberin the pressure generator;b. pressurizing the pressure chamber to a static pressure level,c. vibrating a surface of the pressure chamber to generate a dynamic pressure fluctuation on the pressure level in the pressure chamber,d. sensing the pressure level in the pressure chamber, ande. generating a signal by the sensor representing the dynamic pressure fluctuation,wherein the pressure chamber is heated to at least 700° F. 25. A pressure sensor calibration system comprising:a probe holder further comprising a mount for a pressure sensor to be calibrated and a sensor chamber adjacent the mount, said sensor chamber having an inlet aperture to receive a high pressure gas from a steady source of the high pressure gas to pressurize the sensor chamber, anda pressure chamber having an oscillating surface to dynamically vary the gas pressure level in the pressure chamber, wherein a passage between said pressure chamber and said sensor chamber transmits dynamic pressure variations from the pressure chamber to the sensor chamber and a mechanical shaker is coupled to oscillate said oscillating surface. 26. A pressure sensor calibration system as in claim 25 further comprising a gas discharge port in said pressure chamber through which flows the high pressure air from the sensor chamber via the pressure chamber.
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