Abstract: A case for storage or transport includes a top side, a bottom side, a front side, a rear side, a right side, and a left side, an outermost portion of the bottom side defining a plane. The case further includes at least one wheel including a portion protruding outwardly from one of the front side and the rear side, wherein no portion of the wheel protrudes past the plane defined by the outermost portion of the bottom side.

Abstract: This invention provides an acoustic imaging device in which a large number of transducers are spaced less than a half acoustic wavelength apart on a circle surrounding an object to be imaged. A signal generator generates discrete acoustic frequencies in the range of 100 kHz to 1.5 MHz. Multiplexer systems are provided to permit each transducer, one at a time, to broadcast a signal while the broadcast signal is detected by the other transducers. Electronic equipment records the detected signal and from the recorded information phase and amplitude data is calculated with respect to each transducer location. A computer programmed with an algorithm computes images of slices through the object using the phase and amplitude data. We utilize single frequency, steady-state acoustic signals which enables the accurate determination of the phase and amplitude of the acoustic signals at each receiver transducer.

Abstract: A device and method for producing an image of a fluid moving through a medium. An acoustic wave insonifies the medium to produce Doppler shifted scattering from randomly located scatterers in the moving fluid. At least eight channels of acoustic detectors detect signals reflected from the medium and the amplitudes of the scattered signal is determined at each channel for at least one Doppler shifted frequency. Time averaged channel-to-channel amplitude correlations are produced using the Doppler shifted amplitude data from which the image of the moving fluid is calculated.

Abstract: An acoustic imaging device is disclosed which utilizes mathematical inversion of scattered acoustic wave information to produce an image. A preferred embodiment of the device consists of a ring of acoustic transducers which encircle a medium to be imaged. The medium is sequentially insonified by each transducer with subsequent reception of the scattered waves by the remaining transducers. Explicit mathematical inversion of the scattered wave data using a remap algorithm results in a two-dimensional map of the scattering potential of the medium. Sound speed and density maps can be obtained from a map of the scattering potential. This device is utilizable for imaging of human tissue in vivo and in vitro, and for nondestructive evaluation of materials.

Abstract: A highly accurate in-situ determination of the refractivity of an ambient atmosphere is disclosed, which determination is utilizable to enhance the accuracy of a quantity measurement. The system includes use of a refractometer exposed to an ambient atmosphere and having light directed thereto to form an optical interference fringe pattern having a dependence upon the refractivity of the ambient atmosphere. The fringe pattern is measured as a function of angle either by sequentially scanning a collimated input beam in angle while collecting and detecting the transmitted light, or by imaging (onto a multi-element detector) the angular exit space of the interferometer illuminated with a diverging input beam. The electrical output of the detector is processed to provide an output indicative of the index of refraction of the ambient atmosphere.

Abstract: Method and apparatus for controlling in-series cardiac assist devices which uses the afterload phase angle as the operating criterion. The phase of the pump driving waveform is controlled with a single adjustment. The time interval from the R-wave to midpump systole is used and the phase angle of the pump driving waveform is determined only by this control parameter. The duration of pump systole is thus symmetric about the TMPS adjustment and can be changed without disturbing this phase angle.