Abstract: A method for automatically optimizing ultrasonic frequency power applied by a transducer to human tissue while the transducer is energized with ultrasonic signals from an ultrasonic signal generator. The frequency of an ultrasonic energizing signal applied by the ultrasonic signal generator to the transducer is set. The frequency of the energizing signal applied to the ultrasonic signal generator to the transducer is scanned, at reoccurring intervals, through a sequence of frequencies. The optimum level of power from the transducer is monitored as the frequency is scanned. The frequency of the ultrasonic energizing signal applied by the ultrasonic signal generator is ultimately reset, substantially at the frequency that causes the optimum level of power, until the next reoccurring interval.

Abstract: A system is provided for applying ultrasound power to treat human tissue comprising a transducer driven by an oscillating signal from a power amplifier. The transducer and power amplifier have a power-conversion-efficiency characteristic which is a function of the frequency of the oscillating signal and the acoustic load on the transducer. Data sampling and frequency adjustment means are provided which continually monitor the current supplied to the crystal and adjust the frequency of the oscillating signal to maximize the power-conversion-efficiency of the transducer and power amplifier.

Abstract: A portable instrument used by maintenance technicians to assist in locating an air leak in a pressurized cable sheath. The instrument functions by limiting the area of search thus, permitting a timely repair of the leak to be made. The instrument is comprised of a set of pneumatic hoses that connect the instrument to the cable sheath; a pressure and flow transducer that respectively convert the pressure and flow to proportional d-c voltages; and an analog-to-digital converter that converts the analog voltages to equivalent d-c signals. The digital signals are applied to an electronics calculator that in combination with a keyboard and a computer program solves a set of mathematical equations that when solved, limit the area of search and ultimately provide the location of the air leak. The leak location data is viewed on a digital display and/or the data can be permanently recorded on a hard copy printer.

Abstract: A delayed vehicle starter (DVS) that prevents a motor vehicle from being started and driven away before the driver has observed and determined that there are no persons or objects in the vicinity of the vehicle that may cause an impact. To preclude such an impact the driver must sequentially depress a series of switches, strategically located at the front and rear of the vehicle, within a preset time before the vehicle can be started. If the driver successfully performs the required sequential steps the DVS enables the vehicle ignition system allowing the vehicle engine to be started. Once started, the vehicle must then be moved for a predetermined distance within the preset time or the DVS will disable the vehicle ignition system. To restart the vehicle after the ignition system is disabled the required sequential steps must be restarted from the beginning.