Pressure transducer

Claim 2

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining a recess in the sensing member forming a relatively thin wall adjacent said annular sensing chamber, and means for sensing pressure at said wall, said capillary tube having a passage therethrough extending substantially transverse to the axis thereof and for permitting fluid communication between the capillary tube and said annular sensing chamber.

Claim 3

A pressure transducer as set forth in claim 1 wherein said relatively thin wall has a pressure responsive sensing surface and said means for sensing comprises at least one sensing gage disposed on said sensing surface.

Claim 4

A pressure transducer as set forth in claim 2 wherein said pressure responsive sensing surface extends substantially parallel to the capillary tube length.

Claim 5

A pressure transducer as set forth in claim 3 wherein said pressure responsive sensing surface is substantially flat.

Claim 6

A pressure transducer as set forth in claim 4 wherein the sensing member is substantially cylindrical and said recess forms a flat surface closely adjacent the capillary tube.

Claim 7

A pressure transducer as set forth in claim 1 wherein said annular sensing chamber is defined at least in part by a recess in the outer surface of the capillary tube.

Claim 8

A pressure transducer as set forth in claim 6 wherein the transverse hole in the capillary tube is at approximately a midpoint distance of the recess in the sensing member.

Claim 9

A pressure transducer as set forth in claim 1 wherein said means for sensing comprises a pair of strain gages disposed on a pressure responsive sensing surface of said thin wall and each overlying the center line of the capillary tube.

Claim 10

A pressure transducer as set forth in claim 8 wherein there are also included two other substantially nonactive strain gages disposed outside of the position of the in-line strain gages.

Claim 11

A pressure transducer as set forth in claim 1 in which said sensing member is adaptive for operation over a pressure range of 10,000-50,000 psi.

Claim 12

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining a recess in the sensing member forming a relatively thin wall adjacent said annular sensing chamber, and means for sensing pressure at said wall, said capillary tube being secured at top and bottom ends of the sensing member.

Claim 13

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining a recess in the sensing member forming a relatively thin wall adjacent said annular sensing chamber, and means for sensing pressure at said wall, said capillary tube being secured at top and bottom ends of the sensing member.

Claim 14

A pressure transducer as set forth in claim 11 wherein the securing of the capillary tube is by welding.

Claim 15

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a single capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with only the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining a recess in the sensing member forming a relatively thin wall adjacent said annular sensing chamber, and means for sensing pressure at said wall, a filler piece in the coupler chamber and forming at least a side of the coupler chamber, said filler piece having a coefficient of expansion substantially less than that of the frame.

Claim 16

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a single capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with only the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining a recess in the sensing member forming a relatively thin wall adjacent said annular sensing chamber, and means for sensing pressure at said wall, a filler piece in the coupler chamber and forming at least a side of the coupler chamber, said filler piece having a coefficient of expansion substantially less than that of the frame.

Claim 17

A pressure transducer as set forth in claim 13 wherein said filler piece has a coefficient of expansion substantially less than that of the frame.

Claim 18

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber defined in part by said capillary tube and in fluid communication with the capillary tube, and means defining a sensing surface on the sensing member forming a relatively thin wall adjacent said annular sensing chamber, a liquid filling the capillary tube, coupler chamber and sensing chamber for applying pressure exerted against the coupler to the sensing member, means for sensing pressure at said wall, and means defining a passage extending transverse to the axis of the capillary tube and for coupling fluid between the capillary tube and annular sensing chamber, the liquid filling the capillary tube, coupler chamber and sensing chamber being in a volume range on the order of 0.001-0.002 cubic inch.

Claim 19

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber defined in part by said capillary tube and in fluid communication with the capillary tube, and means defining a sensing surface on the sensing member forming a relatively thin wall adjacent said annular sensing chamber, a liquid filling the capillary tube, coupler chamber and sensing chamber for applying pressure exerted against the coupler to the sensing member, means for sensing pressure at said wall, and means defining a passage extending transverse to the axis of the capillary tube and for coupling fluid between the capillary tube and annular sensing chamber, the liquid filling the capillary tube, coupler chamber and sensing chamber being in a volume range on the order of 0.001-0.002 cubic inch.

Claim 20

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining sensing surface on the sensing member forming a relatively thin wall adjacent said annular sensing chamber, means for sensing pressure at said wall, and means defining a passage extending transverse to the axis of the capillary tube and for coupling fluid between the capillary tube and annular sensing chamber, said capillary tube being secured at top and bottom ends of the sensing chamber.

Claim 21

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining sensing surface on the sensing member forming a relatively thin wall adjacent said annular sensing chamber, means for sensing pressure at said wall, and means defining a passage extending transverse to the axis of the capillary tube and for coupling fluid between the capillary tube and annular sensing chamber, said capillary tube being secured at top and bottom ends of the sensing chamber.

Claim 22

A pressure transducer as set forth in claim 16 wherein the securing of the capillary tube is by welding.

Claim 23

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining sensing surface on the sensing member forming a relatively thin wall adjacent said annular sensing chamber, means for sensing pressure at said wall, and means for securing the capillary tube to top and bottom ends of the sensing member.

Claim 24

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining sensing surface on the sensing member forming a relatively thin wall adjacent said annular sensing chamber, means for sensing pressure at said wall, and means for securing the capillary tube to top and bottom ends of the sensing member.

Claim 25

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber defined at least in part by the capillary tube and in fluid communication with the capillary tube, and means defining a sensing surface on the sensing member forming a relatively thin wall adjacent said annular sensing chamber, a substantially in-compressible liquid filling the capillary tube, coupler chamber and annular sensing chamber, gauge means disposed on said sensing surface for sensing pressure at said thin wall, and means for securing the capillary tube to the sensing member to provide a liquid tight retention between the sensing member and capillary tube whereby the in-compressible liquid is coupled via the capillary tube directly to the annular sensing chamber.

Claim 26

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber defined at least in part by the capillary tube and in fluid communication with the capillary tube, and means defining a sensing surface on the sensing member forming a relatively thin wall adjacent said annular sensing chamber, a substantially in-compressible liquid filling the capillary tube, coupler chamber and annular sensing chamber, gauge means disposed on said sensing surface for sensing pressure at said thin wall, and means for securing the capillary tube to the sensing member to provide a liquid tight retention between the sensing member and capillary tube whereby the in-compressible liquid is coupled via the capillary tube directly to the annular sensing chamber.

Claim 27

A pressure transducer as set forth in claim 19 including a filler piece in the coupler chamber.

Claim 28

A pressure transducer as set forth in claim 19 and means defining a passage extending transverse to the axis of the capillary tube and for coupling fluid between the capillary tube and annular sensing chamber.

Claim 29

A pressure transducer as set forth in claim 19 wherein said sensing member has a passage therein for receiving said capillary tube with the annular sensing chamber defined between said passage and capillary tube.

Claim 30

A pressure transducer as set forth in claim 22 wherein said annular sensing chamber is disposed about the capillary tube.

Claim 31

A pressure transducer as set forth in claim 19 and means defining a passage extending transverse to the axis of the capillary tube and for coupling fluid between the capillary tube and annular sensing chamber, said transverse passage having a length comparable to capillary tube diameter.

Claim 32

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining sensing surface on the sensing member forming a relatively thin wall adjacent said annular sensing chamber, a substantially in-compressible liquid filling the capillary tube, coupler chamber and annular sensing chamber, gauge means disposed on said sensing surface for sensing pressure at said thin wall, and means for securing the capillary tube to the sensing member to provide a liquid tight retention between the sensing member and capillary tube whereby the in-compressible liquid is coupled via the capillary tube directly to the annular sensing chamber, said capillary tube being secured at top and bottom ends of the sensing chamber.

Claim 33

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining sensing surface on the sensing member forming a relatively thin wall adjacent said annular sensing chamber, a substantially in-compressible liquid filling the capillary tube, coupler chamber and annular sensing chamber, gauge means disposed on said sensing surface for sensing pressure at said thin wall, and means for securing the capillary tube to the sensing member to provide a liquid tight retention between the sensing member and capillary tube whereby the in-compressible liquid is coupled via the capillary tube directly to the annular sensing chamber, said capillary tube being secured at top and bottom ends of the sensing chamber.

Claim 34

A pressure transducer as set forth in claim 25 wherein the securing of the capillary tube is by welding.

Claim 35

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extendng through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber defined at least in part by said capillary tube and in fluid communication with the capillary tube, and means defining a sensing surface on the sensing member forming a relatively thin wall adjacent said annular sensing chamber, a liquid filling the capillary tube, coupler chamber and sensing chamber for applying pressure exerted against the coupler to the sensing member, means for sensing pressure at said wall, and means defining a passage extending transverse to the axis of the capillary tube and for coupling fluid between the capillary tube and annular sensing chamber.

Claim 36

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extendng through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber defined at least in part by said capillary tube and in fluid communication with the capillary tube, and means defining a sensing surface on the sensing member forming a relatively thin wall adjacent said annular sensing chamber, a liquid filling the capillary tube, coupler chamber and sensing chamber for applying pressure exerted against the coupler to the sensing member, means for sensing pressure at said wall, and means defining a passage extending transverse to the axis of the capillary tube and for coupling fluid between the capillary tube and annular sensing chamber.

Claim 37

A pressure transducer as set forth in claim 27 wherein the liquid filling the capillary tube, coupler chamber and sensing chamber is in a volume range on the order of 0.001-0.002 cubic inch.

Claim 38

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining sensing surface on the sensing member forming a relatively thin wall adjacent said annular sensing chamber, means for sensing pressure at said wall, and means defining a passage extending transverse to the axis of the capillary tube and for coupling fluid between the capillary tube and annular sensing chamber, said transverse passage having a length comparable to capillary tube diameter.

Claim 39

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining sensing surface on the sensing member forming a relatively thin wall adjacent said annular sensing chamber, means for sensing pressure at said wall, and means defining a passage extending transverse to the axis of the capillary tube and for coupling fluid between the capillary tube and annular sensing chamber, said transverse passage having a length comparable to capillary tube diameter.

Claim 40

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining sensing surface on the sensing member forming a relatively thin wall adjacent said annular sensing chamber, a substantially in-compressible liquid filling the capillary tube, coupler chamber and annular sensing chamber, gauge means disposed on said sensing surface for sensing pressure at said thin wall, means for securing the capillary tube to the sensing member to provide a liquid tight retention between the sensing member and capillary tube whereby the in-compressible liquid is coupled via the capillary tube directly to the annular sensing chamber, and means defining a passage extending transverse to the axis of a capillary tube and for coupling fluid between the capillary tube and annular sensing chamber, said transverse passage having a length comparable to capillary tube diameter.

Claim 41

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining sensing surface on the sensing member forming a relatively thin wall adjacent said annular sensing chamber, a substantially in-compressible liquid filling the capillary tube, coupler chamber and annular sensing chamber, gauge means disposed on said sensing surface for sensing pressure at said thin wall, means for securing the capillary tube to the sensing member to provide a liquid tight retention between the sensing member and capillary tube whereby the in-compressible liquid is coupled via the capillary tube directly to the annular sensing chamber, and means defining a passage extending transverse to the axis of a capillary tube and for coupling fluid between the capillary tube and annular sensing chamber, said transverse passage having a length comparable to capillary tube diameter.

Claim 42

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed at the other end of the frame and having a passage therein for receiving the capillary tube, said sensing member and capillary tube defining therebetween an annular sensing chamber formed between said sensing member passage and said capillary tube, said sensing member further having means defining a sensing surface forming a relatively thin wall adjacent said annular sensing chamber, and means for pressure at said wall.

Claim 43

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed at the other end of the frame and having a passage therein for receiving the capillary tube, said sensing member and capillary tube defining therebetween an annular sensing chamber formed between said sensing member passage and said capillary tube, said sensing member further having means defining a sensing surface forming a relatively thin wall adjacent said annular sensing chamber, and means for pressure at said wall.

Claim 44

A pressure transducer as set forth in claim 31 wherein said annular sensing chamber is disposed about the capillary tube.

Claim 45

A pressure transducer as set forth in claim 31 further including means defining a passage extending transverse to the axis of the capillary tube and for coupling fluid between the capillary tube and annular sensing chamber, said transverse passage having a length comparable to capillary tube diameter.

Claim 46

A pressure transducer as set forth in claim 31 further including and means for securing the capillary tube to opposite ends of the sensing member.

Claim 47

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining a sensing surface on the sensing member forming a relatively thin wall adjacent said annular sensing chamber, a liquid filling the capillary tube, coupler chamber and sensing chamber for applying pressure exerted against the coupler to the sensing member, means for sensing pressure at said wall, and means defining a passage extending transverse to the axis of the capillary tube and for coupling fluid between the capillary tube and annular sensing chamber, the liquid filling the capillary tube, coupler chamber and sensing chamber being in a volume range on the order of 0.001-0.002 cubic inch.

Claim 48

A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining a sensing surface on the sensing member forming a relatively thin wall adjacent said annular sensing chamber, a liquid filling the capillary tube, coupler chamber and sensing chamber for applying pressure exerted against the coupler to the sensing member, means for sensing pressure at said wall, and means defining a passage extending transverse to the axis of the capillary tube and for coupling fluid between the capillary tube and annular sensing chamber, the liquid filling the capillary tube, coupler chamber and sensing chamber being in a volume range on the order of 0.001-0.002 cubic inch.