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'ULTRA'-sonic is a sound wave with a frequency above the normal range of human hearing. Most humans can hear up to 16,000 Hertz. Young people can hear almost to 20,000 Hertz. Bats and mice and other small critters can hear much higher and use those sounds to 'see' the world around them. An ultrasonic imaging device sends a signal into a medium and then listens for the reflected waves. The more receiving transducers you use to pick up the sound the better you can tell what you are 'looking' at. Reflected waves will reach one receiver before the next based on where the reflecting object is located. Electronics are fast enough to determine the direction and distance to the reflected objects. Also the higher the frequency you broadcast the better resolution you will see. A computer is interfaced with an array of receiving tranceducers and it calculates the direction and distance that the many echos must represent and then it plots the picture of the results. The Image can be displayed or printed.
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How do ultrasonic thickness gauges work?
I found a few sites on the web that can help you this and finding out about this. Here are the sites you can look at www.olympus-ims.com/...ultrasonics/introduction-thickness-g
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The sound waves which are below the audible sound are called infrasonics(<20Hz) and The sound waves which are above the audible sound are called ultrasonics(>20KHz).
Brief write up about ultrasonic sound?
"Ultrasonic" means higher frequency than humans can hear.Therefore, you can't hear it.Frequency too high for human ears.Dogs, cats, and bats can hear it if it's not toohigh.Short wavelength makes it good for imaging without radiation.Pictures made with ultrasonic sound are called "ultrasound" images.
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