What is Ultrasonic: Definition and 78 Discussions

Ultrasound is sound waves with frequencies higher than the upper audible limit of human hearing. Ultrasound is not different from "normal" (audible) sound in its physical properties, except that humans cannot hear it. This limit varies from person to person and is approximately 20 kilohertz (20,000 hertz) in healthy young adults. Ultrasound devices operate with frequencies from 20 kHz up to several gigahertz.
Ultrasound is used in many different fields. Ultrasonic devices are used to detect objects and measure distances. Ultrasound imaging or sonography is often used in medicine. In the nondestructive testing of products and structures, ultrasound is used to detect invisible flaws. Industrially, ultrasound is used for cleaning, mixing, and accelerating chemical processes. Animals such as bats and porpoises use ultrasound for locating prey and obstacles.

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  1. A

    Temperature increment of polymer due to pressure in ultrasonic welding

    Hi, I want to do a very simplified model to try to modelize the change of temperature in ultrasonic welding of polimers. As a starting point, I only want to simulate the change of temperature of a 1D homogeneous polymer (viscoelastic solid) when I apply a constant pressure and ultrasounds...
  2. F

    Ultrasonic transducer for standing waves underwater

    Hi I'm not too sure where to post this but since I am, after all, doing a project under the EE department, I thought this might be the best place. I'm new to acoustics, so what I know is rather minimum. I'm trying to look for ultrasonic transducers that can manipulate objects...
  3. E

    Ultrasonic actuator from Ceramic Phono Cartridge

    Hi, I'm using a piezoelectric ceramic phono cartridge to produce high frequency displacements in the phono stylus. I'm driving it with a function generator that has an output of +-10 V sine wave . I connected the generator to a transformer that has a 1/10 reduction ratio to ramp up to voltage...
  4. L

    Ultrasonic Frequencies: Harassment or Something Else?

    I understand it's possible to cross two ultrasonic frequencies one with sound modulating in it possibly in ssb format to recreate the original sound at the point the two cross. I think someone is using this trick to harass me. The sound appeared to be on the other side of a party wall at first...
  5. O

    How Does Ultrasonic Cleaning Work?

    Referring to following video, I would like to know how Ultrasonic clean stuffs. Does it transfer sound wave to move the water molecules for cleaning? Does anyone have any suggestions? Thanks in advance for any suggestions
  6. V

    Ultrasonic waves through pressure

    If you had an ultrasonic transmitter and receiver mounted within a pressurized container, what would happen to the wave signal as the pressure is changed within the container? I understand it's all just air moving, but would there be any obvious change to the ultrasonic wave as the air pressure...
  7. L

    Acid Stripping - with Ultrasonic Assist

    Hello PF, I am trying to chemically strip a metal oxide film from fused silica. The film was deposited at a fairly high temperature, which makes it more difficult to strip than at lower temperatures. During deposition, the film makes its way into the pores of the substrate and slow cooling...
  8. C

    Kramers-Kronig relationship between ultrasonic attenuation and phase velocty

    Hi Forum, I am currently attempting to utilize http://bayes.wustl.edu/etj/articles/kramers-kronig.pdf" Unfortunately ... I have not been successful. I have tried for the past week and asked those around me. All help is appreciated. The equation is as follows: ( 1/c(w0) ) - ( 1/c(w) ) =...
  9. V

    How to Design a 40 kHz Ultrasonic Range Finder Using LM555?

    Homework Statement This is the 40 kHz oscillator used to transmit an ultrasonic burst or “ping”. It uses the LM555 timer configured as an A-stable oscillator. Design the circuit to obtain a 40 kHz square wave signal. Potentiometer P1 is used to adjust the output frequency to precisely...
  10. 3

    Ultrasonic transducer pretty much another SHM problem

    Homework Statement An ultrasonic transducer, of the type used medical ultrasound imaging, is avery thin disk (m=0.10 g) driven back and forth in SHM at 1.0 MHz by an electromagnetic coil. a. The maximum restoring force that can be applied to the disk without breaking it is 40,000 N...
  11. J

    Help with ultrasonic transducer assembly

    Hi, I'm looking for some help. I don't know a thing about electrical engineering except what I've been reading trying to learn about this stuff to solve my problem. I'll tell you for me its like reading something that has been translated into Chinese then to Greek then back to English by a...
  12. N

    Ultrasonic in distance measurement

    Hi tehre, this is my firs post here! I'm designing a complex system using a 40kHz ultrasonic transducers in distance measurement for waste container level detection. Now I have a big problem because the hot season change the air properties in temperature and humidity. Anyone may help me...
  13. P

    Humans Reaction to Ultrasonic Waves

    Is it possible that Ultrasonic waves could make a person irritable if exposed to them for a period of time? Thanks, John
  14. E

    Ultrasonic Distance measure circuit question

    HI, THIS IS MY FIRST POST. I AM ACTUALLY A STUDENT AT A UK COLLEGE AND I AM STUDYING ELECTRONICS. I HAVE ALREADY PASSED MY COURSE WITH FLYING COLOURS WITHOUT SITTING MY FINAL. I AM NOW WORKING ON A PERSONAL PROJECT AT HOME. IM JUST HOPING THAT SOME OF YOU GUYS COULD LOOK AT THYE ABOVE CIRCUIT...
  15. S

    Distance with ultrasonic waves

    A sonar generator on a ship produces periodic ultrasonic waves at a frequency of 2.3 MHz. The wavelength of the waves in sea water is 4.9 · 10-4 m. When the generator is directed downward, an echo is received 16.2 s later. How deep is the ocean in m? Frequency=1/T Velocity=wavelength/T=...
  16. H

    Ultrasonic Radar: How to Build & Use on a Computer

    how do you make a ultrasonic radar to use on a computer? help please
  17. hxtasy

    Which ultrasonic sensor for your face?

    Ok so say i have an application that measures how close your head is to something. I'm currently looking at ultra sonic sensors, I'm not sure which type to get. I am mostly worried about how accurate they will be. Say I'm measuring your head right now how far away it is from your monitor, i...
  18. C

    Designing an Ultrasonic Range Finder with a PIC Microcontroller

    Hi I am designing a ultrasonic range finder. I am part of design group with the challenge of building a robot that can find its way through a known course. I found some circuits avaliable on the net. There is a section on the transmitter circuitry that confuses me. I am using microcontroller...
  19. K

    Fix Ultrasonic Processor Problem - 20 kHz, 500W Power

    I am dealing with the ultrasonic processor with the frequency 20 kHz. It's output power can be varied from 20% to 100% (500W). The problem is that it doesn't work at 100%. Even at 90% it works only for 1 min. At the power lower than 70% it operates longer time. Could you help me to find out...
  20. R

    Ultrasonic distance measurement and ghost echoes

    hi everyone, while doing a project on ultrasonic distance measurement, i came across the phenomenon of ghost echoes. The ultrasonic waves are emitted and made to reflect on a surface( of which the distance to the source is to be found). This reflected waves are detected, and time for b/w the...
  21. A

    How Can I Integrate an Ultrasonic Radar with My Computer for Motion Detection?

    I'm new to this forum, and I'm a Computer Engineer who recently have a lot of passion for circuits. Can anyone help me with a Ultrasonic Radar with can be worked in unison with my Computer to detect any movement. Thankyou all for helping me in advance
  22. R

    Using multistrand wires for an ultrasonic transreceiver

    I was recently doing a project on a ultrasonic transreceiver, and was adviced to use thin multistrand wires for rigging the circuit., for reducing signal noise. I am not able to understand why we need to use multistrand wires, or if they help in reducing noise, how they help. Because i find...
  23. L

    Why will ultrasonic waves not interfere with other sound waves in water?

    why will ultrasonic waves not interfere with other sound waves in water?
  24. S

    Ultrasonic Testing in Industrial Applications

    Has anybody here used ultra sonic testings for internal flaws in metals in the intdustry? If so what purposes did you use it for? Only things I can think of someone using it would be to check inside pipes without turning off the flow...?
  25. E

    Ultrasonic Sensor Setup for Distance Detection

    I have a question regarding ultrasonic sensors. Let's say for example I want to use a typical ultrasonic sensor, in this case let's say: http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=136653 in a circuit for distance detection...
  26. D

    Poisson's Ratio and Ultrasonic Velocity for Isotropic Material

    For an isotropic material, the relation between the longitudinal ultrasonic velocity(VL), the transverse (shear) ultrasonic velocity(VT) and the Poisson's ratio (nu) is given by (VT/VL)^2 = (1-2*nu)/(2*(1-nu)) From the above relation, one gets that VL=0 when nu=1 which is not...
  27. L

    Ultrasonic Sensors for Hovercraft Maze Navigation

    Hi guys! have to build a hovercraft as part of a third year Eletircal engineering project. It must hover through a maze without touching the sides of the walls. I've decided to use ultrasonic sensors to measure distances as opposed to infra red (reason being - ambient lighting will pose big...
  28. C

    Ultrasonic welded plastic parts design

    Recently i got an offer from a company which asked for finite element analysis and design of ultrasonic welded plastic parts. I didn't know that but nevertheless i want to study that. Can anybody help?
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