 Adhesive wound dressing and perforated shield |
| OF PREFERRED EMBODIMENTS In the first embodiment, a "film only" external wound dressing (so termed ... |
|
| Temporary bandage tape |
| This invention is a new style of bandage, or tape for securing a bandage, which is easy to remove ... |
|
| Nail for fixing a fracture of the femur |
| It is an object of the invention to provide a design for the distal end of a bone nail which does ... |
|
| Dynamic patellar brace |
| Accordingly, an object of the present invention is to provide a dynamic patellar brace useful both ... |
|
| Spline and splinting board combination |
| The present invention discloses a spline and splinting board combination which employs an upper ... |
|
| Abduction pillow |
| I claim the following: 1. In abduction apparatus including a resilient deformable pillow having a ... |
|
| Resistance device |
| The present invention provides a simple resistance device which may include adjustability of the ... |
|
| Fret |
| Referring to FIG. 2, a fret 10 is disclosed which comprises a stem 11 and a cap 12. For comparison ... |
|
| Fret system in stringed musical instruments |
| The above mentioned objects have been satisfied in the present invention of a novel fret ... |
|
| Hydrotherapy devices |
| I claim: 1. A hydrotherapy device comprising: a generally tub-shaped lower housing having an upper ... |
|
|
Apparatus and method for transmitting and receiving ultrasonic waves having an acoustoelectric, ultrasonic transducer
| Details |
Inventors: Ishida, Yoshihiko; Tani, Makoto;
Assignee: NGK Insulators, Ltd. (JP)
Primary Examiner: Williams; Hezron E.
Assistant Examiner: Oda; Christine K.
Attorney, Agent or Firm: Parkhurst, Wendel & Burr, L.L.P.
An apparatus for transmitting and receiving ultrasonic waves has a transmitter for sending a pair of ultrasonic waves to a sample. The pair of ultrasonic waves have substantially symmetric waveforms with respect to zero sound pressure. One of the ultrasonic wave is separated from the other ultrasonic wave. An acoustoelectric, ultrasonic transducer receives the pair of ultrasonic waves affected by the sample. The acoustoelectric, ultrasonic transducer converts the pair of ultrasonic waves into a pair of electric signals accompanied by phonon-charge carrier interaction. Each of the electric signals includes an acoustoelectric signal insensitive to phase and a piezoelectric signal sensitive to phase. A processing device processes the pair of electric signals so as to remove the piezoelectric signal and obtain the acoustoelectric signal. The initial ultrasonic waves have opposite phase so that superimposition of the pair of electric signals by the processing device offsets the piezoelectric signals, thereby obtaining the acoustoelectric signals. |
|
DETAILED DESCRIPTION An object of the present invention solves the aforementioned problem by providing an apparatus and a method which are independent of frequency of ultrasonic waves and homogeneity of sound field.
In related art, the electric frequency filter and the interference layer remove the piezoelectric signal through the process of receiving ultrasonic waves by the acoustoelectric, ultrasonic transducer.
In the present invention, however, ultrasonic waves transmitted to a sample have features so as to facilitate processing of electric signals converted by the acoustoelectric, ultrasonic transducer.
In the present invention, a transmitter sends a pair of ultrasonic waves to a sample, and the pair of the ultrasonic waves have substantially symmetric waveforms with respect to a zero sound pressure.
In other words, the superimposition of the pair of ultrasonic waves offsets or cancels the phase of the ultrasonic waves, thereby the electric signal converted by the acoustoelectric, ultrasonic transducer offsets or cancels the phase, isolating the acoustoelectric signal.
One of the ultrasonic waves is separated from the other ultrasonic wave.
Only after one of the ultrasonic waves is transmitted, the other complementary ultrasonic wave is transmitted to the sample so as to prevent the overlap of the pair of ultrasonic waves.
While the transmitter is sending one of the ultrasonic waves, the transmitter does not send the other complementary ultrasonic wave.
An acoustoelectric, ultrasonic transducer receives the pair of ultrasonic waves affected by the sample.
The acoustoelectric, ultrasonic transducer converts the pair of ultrasonic waves into a pair of electric signals accompanied by phonon-charge carrier interaction.
Each of the electric signals includes an acoustoelectric signal that is insensitive to phase and a piezoelectric signal that is sensitive to phase.
A processing device processes the pair of electric signals so as to remove the piezoelectric signal and obtain the acoustoelectric signal
|
| Related patents |
|
|
Synthesizing array for three-dimensional sound field specification
It is an object of the present invention to overcome these and other drawbacks of the prior art. It is another object of this invention to provide a method and an ...
|
|
|
Polymeric compounds with sustained anti-tumor activity and a method for the preparation thereof
OF THE PREFERRED EMBODIMENTS Thus, the inventors have continued extensive investigations being guided by an idea that a composite polymeric compound composed of a ...
|
|
|
Shaving device
What is claimed is: 1. A shaving device comprising: a handle of tubular material having a first end and a second end and comprising a housing; a cartridge in the housing ...
|
|
|
Shaving device
I claim: 1. A razor blade holder which comprises an elongate stem having a head end and a holder end and an axially extending longitudinally aligned receptacle open at ...
|
|
|
Aerosol shaving cream and razor
OF THE PREFERRED EMBODIMENTS Referring now to the Drawing in greater detail, and more particularly to FIGS. 1 and 2 thereof, at this time, the reference numeral 10 ...
|
|
|
Disposable combination razor and shaving cream dispenser with movable cap
I claim: 1. In a disposable combination razor and shaving cream dispenser having a razor blade assembly at top and a pressurized shaving cream dispenser at bottom, said ...
|
|
|
Fountain shaving device
The object of the present invention is to provide a fountain shaving device including a brush mounted on one end of an aerosol container of shaving cream, a razor means ...
|
|
|
Methods of producing microwave device
The invention is a process for fabricating a microwave device comprising dielectric ceramic material selected from materials with nominal formula Ba.sub.2 Ti.sub.9 O....
|
|
|
Patella support brace
Having thus described the invention and illustrated its use, what is claimed as new and is desired to be secured by Letters Patent is: 1. A knee brace adapted to support ...
|
|
|
Adhesive wound dressings
What we claim is: 1. An adhesive wound dressing which comprises a flexible polymer film having an adhesive surface and a non-adhesive surface on the opposite side ...
|
|
|
Cosmetic Surgery 
