Abstract: An improved ultrasonic transducer in which signals from portions of the transducer located a distance apart from each other are compensated for the cancellation affects due to a reflected energy striking one part before the other by use of switching circuits which pass either in-phase or out-of-phase components from the portions of the transducer to a summing circuit in such a manner that the summed output is improved.

Abstract: An ultrasonic transducer in which a plurality of elements are employed alternate ones of which are utilized as transmitters and receivers and having the same area but in which the transmitter elements are composed of material having a high transmit sensitivity while the receiver elements are composed of a material having a high receive sensitivity.

Abstract: An ultrasonic sector scanner uses a transducer mounted within an ultrasonic transmitting medium with a rotating cam surface bearing against the transducer for inducing a rocking motion of the transducer between a pair of predetermined limit positions. The cam surface if rotatably driven by a Cardan joint mounted on a motor output shaft to produce an angular velocity of the transducer wherein the relationship between the angle of the transducer and the input shaft to the Cardan joint is a linear function. The position of the transducer is monitored by a code wheel connected to the motor drive to allow either a constant motor rotation or a selective angular positioning of the transducer.

Abstract: A signal conditioning circuit includes a logarithmic signal compression circuit for compressing wide dynamic range input signals to a dynamic range which is a predetermined portion of the dynamic range of an output utilization apparatus. There is provided, additionally, means for detecting the presence of the high level signals and superimposing a signal representative of the high level signals on the compressed signals to provide a combined output signal which, while compressed to the range of the output utilization apparatus, contains definable low level and high level signals from a wide dynamic range input signal.