Wave transmission lines and networks – Coupling networks – With impedance matching
Patent
1974-11-29
1976-06-01
Smith, Alfred E.
Wave transmission lines and networks
Coupling networks
With impedance matching
179111R, 333 84R, 340 8R, HOlP 308, H04B 1300, H03H 900
Patent
active
039612910
ABSTRACT:
Apparatus useful for mapping fields in the range of infrasonic to ultraso, comprising a distributed electrostatic transducer, functioning as a strip transmission line, which includes a flat, substantially rectangular, metal plate, one surface of which is rough, the plate having a length generally in the range of 10 to 100 wavelengths of the frequency at which the mapping is to be done. A rectangular strip of dielectric foil is disposed under tension on the rough surface of the metal plate so that the foil touches only the most protruding parts of the surface. A long, narrow, rectangular, metallic strip is disposed on and attached to the dielectric foil, the strip being exposed to, and therefore defining, an acoustic pressure field.
A duplexer is electrically connected to the metallic strip and to the flat plate, and is connectable to a source of input signals, and has output terminals at which the output signal may be measured. The result being that, when an electromagnetic delta function is applied at the input to the duplexer, electromagnetic waves travel along the strip transmission line, the duplexer having the function of separating the returning signal reaching the output terminals of the duplexer from the outgoing signal which is interrogating the line. The returning signal contains two groups of frequencies: (1) low-frequency components identical to those present in the acoustic pressure field, and (2) high-frequency components containing wave vectors, also present in the acoustic pressure field, the two components being readily separable, and hence the pressure field may be reconstructed.
REFERENCES:
patent: 1759811 (1930-05-01), Edelman
patent: 3000461 (1961-09-01), Hasbrook
patent: 3060423 (1962-10-01), Goldan
patent: 3373251 (1968-03-01), Seeler
Horwath Tibor G.
Whitehouse Harper John
Johnston Ervin F.
Nussbaum Marvin
Sciascia Richard S.
Smith Alfred E.
Stan John
LandOfFree
Apparatus and method for mapping acoustic fields does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for mapping acoustic fields, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for mapping acoustic fields will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2405105