Patent US4783994A successfully refreshed from Google Patents.
US4783994A
Expired / Lapsed
US
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Pressure measuring probe
Assignee: National Aeronautics and Space Administration
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Filing: 1988-01-13
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Granted: 1988-11-15
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Expires: 2008-01-13
Abstract
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.
Inventors
- 👤 George C. Ashby, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:21
CPC Classifications
G; G01; G01L; G01L19/00; G01L19/0007; G01P; G01P5/00; G01P5/14; G01P5/16; G01P5/165
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
97 words
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.
Claim 2
Dependent Claim
97 words
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.
Claim 3
Dependent Claim
32 words
The invention as defined in claim 1 wherein said probe is used for measuring changes of pressure in a high velocity, high-temperature fluid stream over and around the surface of an object.
Claim 4
Dependent Claim
17 words
The invention as defined in claim 1 wherein said transducer means is a pressure to current device.
Claim 5
Dependent Claim
21 words
The invention as defined in claim 1 wherein said open connector is supported upon a fairing that depends from said housing.
Claim 6
Dependent Claim
37 words
The invention as defined in claim 1 wherein said fairing includes a foot that extends substantially parallel with the longitudinal axis of said exterior housing, the tip of said connector tube being extended forwardly of said foot.
Claim 7
Dependent Claim
22 words
The invention as defined in claim 5 wherein the connector tube varies in cross-sectional area between said tip and said pressure chamber.
Claim 8
Dependent Claim
18 words
The invention as defined in claim 6 wherein said tip is other than circular in its cross-sectional configuration.
Claim 9
Dependent Claim
131 words
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.
Claim 10
Dependent Claim
131 words
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.
Claim 11
Dependent Claim
17 words
The invention as defined in claim 8 including means for sensing the temperature in said pressure chamber.
References Cited (Backward Citations)
US2706408A
Cited
US2986933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |