High pressure capacitive transducer
First Claim
Patent Images
1. A simple and reliable high pressure transducer comprising:
- a capacitive pressure transducer made of two closely spaced insulating plates of low mechanical hysteresis material, said plates each having a layer of conductive material on their opposed faces forming electrodes which are spaced slightly apart from one-another, and at least one of said plates being a diaphragm which is flexible under high pressure to deflect toward the other plate and change the capacitance between said electrodes;
a high pressure fitting for mounting and enclosing said capacitive transducer, said high pressure fitting including a coupling for connecting to a source of high pressure fluid, and a high pressure chamber having an extent comparable to that of the insulating diaphragm;
a thin flexible metal diaphragm bonded to said fitting and sealing said high pressure chamber and blocking high pressure fluid from said transducer; and
means for mounting said transducer within said fitting with the insulating diaphragm in firm engagement with said flexible sheet metal diaphragm, whereby, when the high pressure applied to said coupling changes, the deflection of said sheet metal member and insulating diaphragm change correspondingly, and the resultant changed output capacitance of the transducer indicates the new pressure level.
1 Assignment
0 Petitions
Accused Products
Abstract
A high pressure capacitive transducer includes a capacitive pressure transducer having an insulating diaphragm, and a high pressure fitting for housing the transducer. The high pressure fitting includes a flexible metal diaphragm bonded to the fitting, with the metal diaphragm in engagement with the insulating diaphragm. The metal diaphragm may be boned to the fitting around the periphery of the metal diaphragm to block the high pressure fluid from the transducer. The insulating diaphragm may be relatively thick, such as one-twentieth, one-tenth, or one-fifth of an inch thick, for example.
-
Citations
18 Claims
-
1. A simple and reliable high pressure transducer comprising:
-
a capacitive pressure transducer made of two closely spaced insulating plates of low mechanical hysteresis material, said plates each having a layer of conductive material on their opposed faces forming electrodes which are spaced slightly apart from one-another, and at least one of said plates being a diaphragm which is flexible under high pressure to deflect toward the other plate and change the capacitance between said electrodes; a high pressure fitting for mounting and enclosing said capacitive transducer, said high pressure fitting including a coupling for connecting to a source of high pressure fluid, and a high pressure chamber having an extent comparable to that of the insulating diaphragm; a thin flexible metal diaphragm bonded to said fitting and sealing said high pressure chamber and blocking high pressure fluid from said transducer; and means for mounting said transducer within said fitting with the insulating diaphragm in firm engagement with said flexible sheet metal diaphragm, whereby, when the high pressure applied to said coupling changes, the deflection of said sheet metal member and insulating diaphragm change correspondingly, and the resultant changed output capacitance of the transducer indicates the new pressure level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A simple and reliable high pressure transducer comprising:
-
a capacitive pressure transducer made of two closely spaced insulating plates of low mechanical hysteresis material, said plates each having a layer of conductive material on their opposed faces forming electrodes which are spaced slightly apart from one another, and at least one of said plates being a diaphragm which is flexible under high pressure to deflect toward the other plate and change the capacitance between said electrodes; a high pressure fitting for mounting and enclosing said capacitive transducer, said high pressure fitting including a coupling for handling pressures in excess of 5,000 psi for connecting to a source of high pressure fluid, and a high pressure chamber having an extent comparable to that of the insulating diaphragm; a thin flexible metal diaphragm bonded to said fitting and sealing said high pressure chamber and blocking high pressure fluid from said transducer; means for mounting said transducer within said fitting with the insulating diaphragm in firm engagement with said flexible sheet metal diaphragm; and said mounting means including a heavy retaining ring is extended threaded engagement with said fitting for holding said two insulating plates with the insulating diaphragm firmly against said metal diaphragm; whereby, when the high pressure applied to said coupling changes, the deflection of said sheet metal member and insulating diaphragm change correspondingly, and the resultant changed output capacitance of the transducer indicates the new pressure level. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
-
Specification