Abstract: A sonar for detecting and localizing sources of high frequency sonar pulses n range and bearing in real time. Three hydrophones pick up sonar pulses and process them in their respective detectors for storing. Detection by all three detectors cause the stored signals to be sent to a cross-correlator computer for range and bearing calculation.

Abstract: An improvement of the Wunsch test method for measuring pulsed-power failure thresholds of bipolar transistors and p-n junction diodes using short-pulse testing with pulse durations of 100 nanoseconds or less. A square pulse of reverse current is used to damage the p-n junction of interest, and the absorbed power is computed from oscilloscope traces of voltage and current. A constant-current pulse is used rather than the constant power pulse of the Wunsch test method, thereby limiting the damage done to the device and permitting a wide range of device parameter to be observed. The degree of device degradation is utilized to distinguish between true and false measurements of thresholddamage input-power and also to ensure that the individual failure levels of specimens of a sample actually are threshold failure levels rather than overkill levels, in order that the average of these levels represents, approximately, a 50% probability of failure for the sample.

Abstract: A junction photodetector employing Pb.sub.1-x Sn.sub.x Te in narrow film strips grown epitaxially on an appropriate substrate. An appropriate metal overlaps the film to form a metal-semiconductor contact.

Abstract: A modified Huggin's Scanner whose tunable signal bandwidth can be broadened ithout affecting the beam position and whose output beam direction is dependent on the control of a resistor. Two separate voltage controlled oscillators are utilized in this system in addition to modifying the input frequency controls to the scanner.