Piezoelectric transducer

Claim 2

A piezoelectric transducer comprising a conductive metal electrostatic shielding jacket, a plurality of quartz wafers in said jacket with their optical axes aligned in the same plane, a seismic mass in said jacket, and a preloading sleeve in said jacket surrounding said wafers and mass and applying a preloading force to said quartz wafers, a P-channel enhancement MOSFET in said jacket having gate, drain and source electrodes, means in said jacket coupling said quartz wafers across the gate and drain electrodes of said MOSFET, a junction transistor in said jacket having a base, emitter and collector, means coupling the output of said MOSFET to the base of said junction transistor, and a coaxial cable connector on said jacket connected across the emitter-collector circuit of said junction transistor.

Claim 3

A transducer according to claim 1 including a load impedance in said jacket coupling said junction transistor to said cable connector.

Claim 4

An instrument transducer comprising a housing, a piezoelectric device in the housing for producing an electrical signal when deformed from a normal condition thereof, means movable in response to a physical input to the transducer for deforming said device from its normal condition so that the device generates an electrical signal having a value indicative of the value of said input (active circuit means) an enhancement MOSFET in a common drain configuration in the housing (of such type to require energization thereof from externally of its housing) , coupled to said device for receiving generated signals from the device and for operating upon the generated signals in a predetermined manner to provide transducer output signals (and) MOSFET energization and transducer output signal connector terminal means carried by the housing and including only two terminal elements each of which is conductively connected to separate locations in said circuit means(.) a coaxial cable connected at one end thereof to the transducer connector terminal elements, a signal readout device coupled to the other end of the cable for receiving output signals from the transducer, and power supply means connected across the cable between the traNsducer housing and the readout device. (

Claim 5

An instrument transducer comprising a housing, a piezoelectric device in the housing for producing an electrical signal when deformed from a normal condition thereof, means movable in response to a physical input to the transducer for deforming said device from its normal condition so that the device generates an electrical signal having a value indicative of the value of said input (active circuit means) an enhancement MOSFET in a common drain configuration in the housing (of such type to require energization thereof from externally of its housing) , coupled to said device for receiving generated signals from the device and for operating upon the generated signals in a predetermined manner to provide transducer output signals (and) MOSFET energization and transducer output signal connector terminal means carried by the housing and including only two terminal elements each of which is conductively connected to separate locations in said circuit means(.) a coaxial cable connected at one end thereof to the transducer connector terminal elements, a signal readout device coupled to the other end of the cable for receiving output signals from the transducer, and power supply means connected across the cable between the traNsducer housing and the readout device. (

Claim 6

In combination with a transducer according to claim 3, a coaxial cable connected at one end thereof to the transducer connector terminal elements, a signal readout device coupled to the other end of the cable for receiving output signals from the transducer, and power supply means connected across the cable between the transducer housing and the readout device.)

Claim 7

The combination according to claim (4) 3 wherein the (transducer circuit means) MOSFET has input terminals coupled across the piezoelectric device and output terminals coupled across the coaxial cable, the (circuit means) MOSFET being arranged so that the voltage across the output terminals follows substantially a voltage applied across the input terminals thereof and so that the (circuit means) MOSFET appears to define an open circuit between the input and output terminals thereof.

Claim 8

In a transducing device having a piezoelectric element mounted within a housing, the combination comprising (an active circuit) an enhancement MOSFET in a common drain configuration energized from externally of said housing for coupling the piezoelectric element to a low impedance coaxial line, the (circuit) MOSFET including input terminal means and output terminal means, means for connecting the input terminal means to the piezoelectric element for supplying signals derived from the element to the (circuit) MOSFET , the (circuit) MOSFET being arranged so that a voltage at the output terminal means follows substantially the value of a signal applied to the input terminal means and so that the (circuit) MOSFET appears to define an open circuit between the input and output terminal means, the (circuit) MOSFET being mounted within the housing, (and) a two-terminal coaxial connector mounted on the housing and connected within the housing across the (circuit) MOSFET output terminal means(.) , a low impedance coaxial line connected to said connector at one end thereof, and a high impedance potential source coupled across the other end of the line for energizing the circuit, the output signal of the transducing device being derived across the coaxial line . (

Claim 9

In a transducing device having a piezoelectric element mounted within a housing, the combination comprising (an active circuit) an enhancement MOSFET in a common drain configuration energized from externally of said housing for coupling the piezoelectric element to a low impedance coaxial line, the (circuit) MOSFET including input terminal means and output terminal means, means for connecting the input terminal means to the piezoelectric element for supplying signals derived from the element to the (circuit) MOSFET , the (circuit) MOSFET being arranged so that a voltage at the output terminal means follows substantially the value of a signal applied to the input terminal means and so that the (circuit) MOSFET appears to define an open circuit between the input and output terminal means, the (circuit) MOSFET being mounted within the housing, (and) a two-terminal coaxial connector mounted on the housing and connected within the housing across the (circuit) MOSFET output terminal means(.) , a low impedance coaxial line connected to said connector at one end thereof, and a high impedance potential source coupled across the other end of the line for energizing the circuit, the output signal of the transducing device being derived across the coaxial line . (

Claim 10

The combination according to claim 6 including a low impedance coaxial line connected to said connector at one end thereof, and a high impedance potential source coupled across the other end of the line for energizing the circuit, the output signal of the transducing device being derived across the coaxial line.)

Claim 11

A piezoelectric transducer comprising a jacket, a piezoelectric element in said jacket, a P-channel enhancement MOSFET in said jacket having gate, drain and source electrodes, means coupling said piezoelectric element to the gate and drain electrodes of said MOSFET, a two-wire cable connector on said jacket, means in said jacket coupling said connector to the source and drain electrodes of said MOSFET, and a bipolar transistor in said jacket coupling said MOSFET to said cable connector, said bipolar transistor having an emitter, collector and base, said collector being coupled to said MOSFET source electrode and said base being coupled to said MOSFET drain electrode.

Claim 12

A piezoelectric transducer comprising a jacket, a piezoelectric element in said jacket, a P-channel enhancement MOSFET in said jacket having gate, drain and source electrodes, means coupling said piezoelectric element to the gate and drain electrodes of said MOSFET, a two-wire cable connector on said jacket, means in said jacket coupling said connector to the source and drain electrodes of said MOSFET, and a bipolar transistor in said jacket coupling said MOSFET to said cable connector, said bipolar transistor having an emitter, collector and base, said collector being coupled to said MOSFET source electrode and said base being coupled to said MOSFET drain electrode.

Claim 13

A piezoelectric transducer comprising: a housing; a piezoelectric device with two electrodes in the housing for producing an electrical signal when deformed from a normal condition thereof; means movable in response to a physical input to the transducer for deforming such device from its normal condition so that the device generates an electriCal signal having a value indicative of the value of said input; means establishing an electrical ground potential in said housing; an enhancement MOSFET in said housing having gate, drain and source electrodes, said drain electrode being connected with said ground potential means and said piezoelectric device being connected from said gate to said ground potential means; and a coaxial cable connector on said housing having an inner terminal connected with the source electrode of said MOSFET and an outer terminal connected with said ground potential means.

Claim 14

A piezoelectric transducer comprising: a housing; a piezoelectric device with two electrodes in the housing for producing an electrical signal when deformed from a normal condition thereof; means movable in response to a physical input to the transducer for deforming such device from its normal condition so that the device generates an electriCal signal having a value indicative of the value of said input; means establishing an electrical ground potential in said housing; an enhancement MOSFET in said housing having gate, drain and source electrodes, said drain electrode being connected with said ground potential means and said piezoelectric device being connected from said gate to said ground potential means; and a coaxial cable connector on said housing having an inner terminal connected with the source electrode of said MOSFET and an outer terminal connected with said ground potential means.

Claim 15

The piezoelectric transducer of claim 9 including a junction transistor in said housing having a base element connected with the drain electrode of said MOSFET, an emitter electrode connected with said ground potential means and a collector electrode connected with the source electrode of said MOSFET.

Claim 16

The piezoelectric transducer of claim 9 in combination with a coaxial cable connected with the cable having an outer conductor and a center conductor and connector, a remote station including a source of DC voltage having one terminal connected with said ground potential means through the outer conductor of said cable, a load resistor connected between the other terminal of said power source and the source electrode of said MOSFET through the center conductor of said cable, the amplified output of said piezoelectric device appearing between the load resistor connection to the coaxial cable and the ground potential means.

Claim 17

The piezoelectric transducer of claim 10 in which said MOSFET is a P-channel element and said junction transistor is an NPN element.

Claim 18

The piezoelectric transducer of claim 11 in which said MOSFET is a P-channel element and including an NPN junction transistor in said housing having a base element connected with the drain electrode of said MOSFET, an emitter electrode connected with said ground potential means and a collector electrode connected with the source electrode of said MOSFET, and in which said DC power source has its negative terminal connected with said ground potential means and its positive terminal connected through said load resistor and the coaxial cable with the source electrode of said MOSFET and the collector element of said transistor.

Claim 19

The piezoelectric transducer of claim 9 including a load impedance connected in series between the inner terminal of the coaxial connector and the source electrode of the MOSFET.

Claim 20

The piezoelectric transducer of claim 14 in combination with a coaxial cable having an outer conductor and a center conductor and connected with the cable connector, a remote station including a source of DC voltage having one terminal connected with said ground potential means through the outer conductor of said cable, another resistor connected between the other terminal of said power source and through the center conductor of said cable and the load resistor with the source electrode of said MOSFET, the amplified output of said piezoelectric device appearing as a current at a summing point between the center conductor of the coaxial cable and said other resistor.