Ultrasonic Definition and 79 Threads

HAllo everyone, I had a problem with the measurement of young modulus and shear modulus with ultrasonic measurements( pulse-echo overlap technique) For my metallic glasses rods (amorphous material) I used these formula for the calculation: 1. determination Shear modulus: G= ro * v...

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...

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...

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...

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...

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

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...

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...

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) ) =...

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...

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...

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...

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...

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

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...

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=...

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

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...

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...

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...

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...

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

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...

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

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...?

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...

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...

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...

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?