Magnetic switch for a pulse generator, receiver, and transducer

Claim 2

A switching circuit for automatically isolating a receiver from a transmitter pulse generator when the pulse generator is energized comprising a transducer connected to receive the output of said pulse generator and to radiate it and to receive echoes, a generally annular-shaped first magnetic core means with a pair of windings wound thereon and with the first of said windings connected to the output of said transducer, a receiver connected to the other of said pair of windings, second magnetic core means magnetically coupled to said first magnetic core means, a third winding wound on said second magnetic core means and connected to the output of said pulse generator such that the magnetic coupling between said first and second windings is varied when said third winding is energized.

Claim 3

A switching circuit according to claim 1 wherein said second magnetic core means is generally C-shaped with opposed legs and said first core means mounted between said opposed legs.

Claim 4

A switching circuit according to claim 1 including a choke coil mounted in series with said third winding.

Claim 5

A switching circuit according to claim 1 wherein said first and second magnetic core means are integrally formed such that said third winding when energized can effectively decouple said first and second windings.

Claim 6

A switching circuit according to claim 4 including a diode and a first capacitor connected between said transducer and said first winding and means for controlling conduction of said diode connected to said pulse generator so that diode blocks current between said transducer and said first winding when said pulse generator is energized.

Claim 7

A switching circuit according to claim 5 wherein said means for controlling conduction comprises a second capacitor connected between said pulse generator and the connection point between said diode and first capacitor, and a bias voltage source connected between ground and said connection point.

Claim 8

A switching circuit according to claim 6 wherein said second capacitor is variable.

Claim 9

A switching circuit according to claim 7 including a resistor connected in series with said voltage source and ground.

Claim 10

A switching circuit according to claim 8 wherein said resistor is variable.

Claim 11

A switching circuit according to claim 6 including a time adjuster and a wave form generator connected in series between said pulse generator and said second capacitor and said time adjuster delays the signal from said pulse generator and controls the wave form generator such that it supplies a bias signal to the diode which varies as a time function to provide time sensitivity adjustment.

Claim 12

An ultrasonic duplexer for an apparatus comprising: a. a pulse generator; b. a transducer connected to said pulse generator; c. a magnetic switching device consisting of a magnetic core, a first coil wound thereon and a second coil wound also thereon which form a transformer, said first coil being connected to said transducer; d. a receiver connected to said second coil of said transformer; e. a second core located in association with said first core and having wound thereon a third coil which is connected to said pulse generator to control said transformer; f. a diode switching device connected between said transducer and said first coil; g. means connected in association with said pulse generator and said diode switching device for controlling the conduction of said diode switching device; and h. a resistor connected in association with said diode switching device.

Claim 13

An ultrasonic duplexer for an apparatus comprising: a. a pulse generator; b. a transducer connected to said pulse generator; c. a magnetic switching device consisting of a magnetic core, a first coil wound thereon and a second coil wound also thereon which form a transformer, said first coil being connected to said transducer; d. a receiver connected to said second coil of said transformer; e. a second core located in association with said first core and having wound thereon a third coil which is connected to said pulse generator to control said transformer; f. a diode switching device connected between said transducer and said first coil; g. means connected in association with said pulse generator and said diode switching device for controlling the conduction of said diode switching device; and h. a resistor connected in association with said diode switching device.

Claim 14

An ultrasonic duplexer according to claim 11 in which said controlling means includes a DC voltage source and a capacitor which is supplied with the pulse from the pulse generator.

Claim 15

An ultrasonic duplexer according to claim 12 in which said capacitor is made variable to change the time constant of said controlling means.

Claim 16

An ultrasonic duplexer according to claim 12 in which said resistor is made variable to change the time constant of said controlling means.

Claim 17

An ultrasonic duplexer according to claim 12 in which said controlling means further includes a second means for controlling the conduction state and conduction time of said diode switching device.

Claim 18

An ultrasonic duplexer according to claim 15 in which said second means consists of a time adjuster and a wave form generator connected between said pulse generator and capacitor.