Pressure measuring probe
AssigneeAdministrator of the National Aeronautics and Space Administration
InventorGeorge C. Ashby, Jr.
Life of this patent
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Abstract
The invention is a probe (10) for measuring changes in pressure in a high locity fluid streams over and adjacent the surface of an object. The probe (10) is formed of an exterior housing (11) having a closed pressure chamber (28) in which a piezo-electric pressure transducer (32) is mounted. An open connector tube (26) having a probe tip (29) passes a portion of said fluid stream into the closed pressure chamber (28), any change of pressure therein requiring a "settling-time" to appear in the closed pressure chamber (28) that is inversely proportional to the cross-sectional area of the connector tube (26). A cooling chamber (47) formed around the pressure chamber (28) is connected to a source of cooling fluid by means of inlet and outlet tubes (44) and (46), respectively.
Claims9
A probe for measuring pressure changes in a high velocity, high-temperature fluid stream comprising:
- an exterior housing having a closed pressure chamber therein;
- transducer means mounted in said closed pressure chamber for measuring pressure changes in said fluid stream;
- means in said exterior housing for cooling said transducer means;
- and
- an open connector tube including a probe tip for passing a portion of said fluid stream into said closed pressure chamber, any change of pressure therein requiring a "settling-time" to appear in said closed chamber that is inversely proportional to the cross-sectional area of said connector tube.
A probe for measuring pressure changes in a high velocity, high-temperature fluid stream comprising:
- an exterior housing;
- first and second inner housings within said exterior housing, said first inner housing forming a sealed cooling chamber around said second inner housing which forms said pressure chamber therein;
- inlet and outlet tubes for maintaining cooling fluid in said cooling chamber thereby cooling said transducer means in said pressure chamber;
- transducer means mounted in said closed pressure chamber for measuring pressure changes in said fluid stream;
- and
- an open connector tube including a probe tip for passing a portion of said fluid stream into said closed pressure chamber, any change of pressure therein requiring a "settling-time" to appear in said closed chamber that is inversely proportional to the cross-sectional area of said connector tube.
Dependencies are inferred from the claim text.