I think "Ultrasonic" dates back to 1923, prior to that such terms as "ultra-sonorous" (1917 patent 1471547) and "superaudible frequencies" (1943 patent 2420676) were also used so searching older literature for ultrasonic may not get the hits that are there under different names.
Ultrasonic sound (Wiki: Ultrasound) has a frequency that's above human hearing. Started this page after getting a couple of the Dukane SeaCom NA1 Underwater Accustic Beacons.
Bats (Wiki)use ultrasonic SONAR (Wiki) signals to locate very small insects while they are flying.
Fig 1) is not the Underwater Locator Beacon (Wiki: ULB) used on aircraft Flight Data Recorders (Wiki) or Cockpit Voice Recorders (Wiki) since this NA1 unit does not have a water activated switch. i.e. the NA1 is on whenever the 9V battery is installed. It is part of the Dukane N30A5B Underwater Beacon Locator (Fig 2) set that includes Receiver model N15A235B.
These are for divers to place to make something they want to return to without leaving a visible bouy at the surface.
These are powered by the common 9V battery. The plastic bottom of the battery compartment has a tapered slot that gives the battery terminals access. If the negative battery terminal is toward the wide end of the slot and the positive battery terminal toward the narrow end of the slot the battery will install properly and when pressed down you will feel the contact springs, but if installed in the reverse direction the battery will not go down enough to allow the cover to be installed and when pressed will not move.
I'm guessing this is a pulsed beacon, just like the ones used on the aircraft black boxes since that mode of operation greatly extendes the battery life.
I tried using the CSE Batdetector and heard nothing on both of my NA1 beacons.
These were developed during W.W.II to find enemy submarines. One of the first, if not the first, U.S. sonobuoy is the CRT-1. This was also used as the basis of the Project Mogul baloons, one of which crashed at Roswell NM.
World Precision Instruments Inc. Model PUC-Y with Connoisseurs Delicate Jewelry Cleaner
Modes of operation are Off, medium Pulsed and High constant.
The jewelry cleaner has a basket inside the container, so you just put the jewelry in the basket and put water in the cleaner to couple the ultrasound to the cleaner.
Note: If jewelry in put directly in the metal bowl it might destroy the stones because the jewelry would be hitting the metal bowl, so a few layers of cloth or a basket &Etc. is needed to seperate keep what's being cleaned from touching the metal.
Do not know what the two clamps held, didn't come with the cleaner.
These are made in a number of sizes, larger ones for industrial cleaning applications and this one I have for cleaning jewlerey.
Ultrasonic Gold Wire Bonder
When I was designing Radar Warning Receiver microwave modules where we built the circuit using raw diode chips (not in packages) some of the wire bonding machines used an ultrasonics to shake the bonding tip to put energy into the bond. In order to fuse the pure gold wire with the pure gold mound on the diode top contact it takes a combination of energy (heat plus ultrasonic) and pressure to get the metal to fuse.
There was a magazine article about using a piezo disk to listen to the 32768 Hz oscillator in modern digital watches and thus be able to adjust the watch to be more accurate.
These have been suggested as a way to hear things like bats.
The range finder mechanism uses ultrasonic sound and so might be a way to get a sensitive ultrasonic microphone.
Holosonics Audio Spotlight
A narrow beam of ultrasonic sound at about 65 kHz is modulated with an audio signal. Only people within the narrow beam can hear the audio. Used in stores where if you're standing in the right spot (marked with a decal on the floor) you hear the pitch, but nearby people do not hear anything. Also used in magic acts where the "mind reader" is the only one in the beam.8027488 Parametric audio system, F. Joseph Pompei, MIT, 2005-07-13 -
YouTube - Naval Post Graduate School -
Some of these patents look a lot like the transducer on the CRT-1 sonobuoy that dates to W.W.II.
3587038 Ultrasonic homing beacon and communication equipment for underwater swimmers, Frank Massa Jr, Dynamics Corp America, Jun 22, 1971 - 367/118, 367/120, 367/910
1385795 Method of and apparatus for detecting and locating sound, &c. Elias E Ries, (Jun 20, 1912) Jul 26, 1921, 367/120, 342/350
Stereo underwater microphones & steres headphones
3005183 Underwater transmitter Fred M Mayes, (Jan 10, 1951) Oct 17, 1961, 367/137, 181/125, 367/142, 114/20.1, 102/395, 367/166
Calls:3079583 Sonar calibrator Herbert R Beitscher, George A Coates, Royal H Akin, Sec of Navy, Feb 26, 1963, 367/13, 455/84, 331/59, 73/1.82, 331/69, 367/910, 455/78 - small cylindrical battery powered transistor based 20 kHz barium titanate transducer is placed in contact with the sonar transducer and can check Rx or Tx functinality.
2460316 Echo ranging and listening gear, Horace M Trent, Thomas F Jones, (Jul 31, 1944), Feb 1, 1949, 367/107, 367/137, 340/566, 367/901
Battery operated device capable of use for the location of submarines by direct audio listening: super audio listening or by echo ranging.
3123798 Fish finder, Rollind & John Holloway Electronics World, Mar 3, 1964, 367/94, 367/910, 181/125, 367/104, 367/173, 43/17.1 -
Decsector for sound & ultrasound
3320581 Piezoelectric voice range transducer, Sims Claude C, May 16, 1967, 367/157 - stack of ferroelectric elements
3489993 Ultrasonic homing beacon and communication equipment for underwater swimmers, Frank Massa Jr, Dynamics Corp America, Jan 13, 1970, 367/120, 367/910 - a 40 to 80 kHz range directional receiver for use by an underwater diver to locate a beacon.
2935728 Underwater object locator, Adolph R Morgan, Rca Corp, (Feb 15, 1946), May 3, 1960, 367/101, 367/910, 367/107, 367/116
probably classified during W.W.II. Uses an FM modulated (not pulsed) ultrasonic signal in the 500 kHz to 1 MHz range.
3005183 (see above)
3079583 (see above)
3123798 (see above)
3262094 Discontinuous hollow cylindrical transducer, Camp Leon W, Jul 19, 1966, 367/156, 367/151 - magnetostrction transducer
2311079 Transducer, Parr Jr Josephus O, (Mar 28, 1940) Feb 16, 1943, 367/182, 336/30 - broader bandwidth & more efficient
2468837 Magnetostrictive transducer, Peck Jr Robert L, Bell Telephone Labor Inc, (Aug 2, 1945) May 3, 1949, 367/168, 366/127
2631271 Tubular hydrophone, A.L. Thuras, Sec of Navy, Mar 10, 1953, 367/168 - a device for generating or receiving sound signals at sonic or ultrasonic frequencies, and more particulary to an underwater transdecer of the tublar magnetostrictive type having a toroidal-would coil for converting compressional wave energy into electrical energy or vice versa.
2521136 Hydrophone, A.L. Thuras, Sec of Navy, (Apr 28, 1949) Sep 5, 1950, 310/26, 381/190, 367/168, 381/163
2005741 Magneto-strictive sound generator, Hayes Harvey C, (Dec 15, 1932) Jun 25,1935, 367/178, 318/118, 181/157, 367/168, 381/190, 310/26
2398117 Magnetostrictive oscillator, Elias Claesson Per Harry, Fabian Rost Helge, (May 3, 1941) Apr 9, 1946 - 367/151, 381/190, 310/26, 367/1562438926 Magnetostrictive supersonic transducer, Mott Edward E, Bell Telephone Labor Inc, (Aug 18, 1944) Apr 6, 1948 - 367/168, 381/190, 335/215, 310/262834000 Sound detecting device, Wiggins Alpha M, Electro Voice, (Dec 9, 1953) May 6, 1958, 367/155, 367/173 - barium titanate & aluminum stack
2891232 Hydrophone for directional listening buoy, Heinrich O Benecke, (Jun 28, 1955) Jun 16, 1959, 367/151, 367/153, 343/844
3021504 Apparatus for controlling the effective compressibility of a liquid, William J Toulis, Feb 13, 1962, 367/150, 181/402, 367/151 - shaping underwater beam to 60 kHz.
3160769 Magnetostrictive transducer, Abbott Frank R, Dec 8, 1964, 310/26, 367/168, 367/156, 318/118, 367/160 -
PRC68, Alphanumeric Index of Web pages, Contact, Products for Sale
Page Created 24 Oct 2015