Each sensor unit includes an ultrasonic transmitter and an ultrasonic receiver.

There is an ultrasonic horn provided on the body, and the ultrasonic horn is operatively connected with the ultrasonic transducer.

Disposed concentrically round this receiver is at least one annular ultrasonic transmitter.

The source of vibration may be an ultrasonic horn.

The apparatus comprises a signal generator (4) and an ultrasound transmitter.

The in-vivo device includes an ultrasonic transmitter for transmitting an ultrasonic signal, which is triggered by the radio pulse.

The delivery apparatus introduces a light sensitive drug and includes an ultrasound apparatus with an ultrasound emitter coupled to an ultrasound source.

An ultrasonic transmitter is used to produce an ultrasonic transmission signal and a hand held, hand manipulable ultrasonic receiver is used to pick up the ultrasonic transmission signals and produce an output.

A plurality of echo soundings are collected, the soundings produced by an ultrasonic transmitter and detected by an ultrasonic receiver.

Disclosed systems include ultrasonic transmitter (106), pulser (104), ultrasonic receiver (108), amplifier (110) and indicator (114).

Each identification tag has its own identification code (ID code) and is equipped with an ultrasonic transmitter, radio transmitter and radio receiver.

The hybrid input device also includes an ultrasonic transmitter that transmits an ultrasonic data pattern.

The amplitude modulated signals are transmitted by an ultrasonic transmitter using the water filled drill string as a wave guide and are received by an ultrasonic receiver at the surface.

A bonding tool for use with an ultrasonic horn comprising an orifice at a first end of the ultrasonic horn and a capillary having a first tapered or beveled and coupled to the orifice of the ultrasonic horn.

Preferably the layers are welded by passing the composite between an ultrasonic horn and an ultrasonic bond roll having raised areas for effecting the weld points.