Pall Corporation

Arx Limited

George A Altemose

Scott D Hopkins

Daniel W Spencer

David B Giguere

Wilfred J Gully

Stanley E Spencer

Charles P Lipari

William Wiemann

Edwin R Joscelyn

Michael Consi

An apparatus for detecting defects in porous elements including systems and methods for quantifying acoustic signal data. A transducer receives acoustic signals generated within a test chamber by a porous element. A signal processing device may be included for analyzing the acoustic signals received, for quantifying the acoustic signals, and for correlating the acoustic signals with physical attributes of the porous element.

System and method for testing the integrity of porous elements

A refrigeration control apparatus especially adapted for use in conjunction with cryogenic coolers includes a brushless variable speed drive motor for powering a mechanical cooler-compressor and electronic control circuitry coupled to the motor allowing motor speed and hence cooling rate to be responsive to changes in the temperature of the volume sought to be cooled. A signal corresponding to sensed temperature is compared to a reference signal derived from motor speed. The difference therebetween used to vary the duty cycle of a high frequency pulse train. The pulse train is used to modulate the drive current applied to the motor through pulse position switching circuitry to vary the speed of the drive motor. High and low motor speed limits are provided along with sensor failure protection circuitry to insure continuous motor operation between chosen limits.

Dual hybrid demand refrigeration control apparatus

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Stony Brook, NY, United States of America

George A Altemose