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Reduce ringing of ultrasonic with some special housing

Hi,Dear Friends I have found many topics related to ringing of ultrasonic sensors and a way to damp this ringing. I have a expirience of designing an ultrasonic range meter and some ways to damp ringing:

1.first of all you can reduce the number of pulses which is sent toward the target for example 4 cycles 2.This is my own experience and I haven't seen it any where and also it answers practically that is keeping the transmitter sensor in a compliant mount and that damps the ringing very much. 3.if using two sensors one for transmitting and the other for receiving surely use horns to reduce the effect of transmitting pulse on receiver. also I have found some way in the pages of group one of them was using a inductor ,I will thank you if anybody explains it more for me.
Reply to
Sara
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Hi,Dear Friends I have found many topics related to ringing of ultrasonic sensors and a way to damp this ringing. I have a expirience of designing an ultrasonic range meter and some ways to damp ringing:

1.first of all you can reduce the number of pulses which is sent toward the target for example 4 cycles 2.This is my own experience and I haven't seen it any where and also it answers practically that is keeping the transmitter sensor in a compliant mount and that damps the ringing very much. 3.if using two sensors one for transmitting and the other for receiving surely use horns to reduce the effect of transmitting pulse on receiver. also I have found some way in the pages of group one of them was using a inductor ,I will thank you if anybody explains it more for me.
Reply to
Sara

This has been a matter of considerable interest in diagnostic ultrasound for some years now - and had been when I was working on it back in 1976-79.

Don't re-invent the wheel. There should be quite a lot of published work on the subject for you to find and digest.

"James Meindl " + ultrasound might be a string to conjure with on google. "J D Meindl " + ultrasound on Google Scholar.

--
Bill Sloman, Nijmegen
Reply to
bill.sloman

Hello Sara,

While the transmitter stage does influence ringing there are two other technical areas that have a much larger impact:

a. The backing material behind the transducer. I am sure you can find some good literature on that in papers from, for example, the IEEE-UFFC society. The actual "recipe" for backing material is a closely guarded trade secret. Therefore, I cannot disclose much here. The only suggestion I can give here is to think about methods of sound proofing in acoustics. The principles are, by nature, very similar.

b. Look at what happens after the transmit pulse. Here you would have to tell us more about your system. Is there a T/R switch and a receiver? Basically you need to make sure that the transducer isn't left open after a transmit burst.

--
Regards, Joerg

http://www.analogconsultants.com
Reply to
Joerg

What we used at EMI in 1977 was tungsten-loaded epoxy - the tungsten powder was appreciably finer than the wavelegth of the 2MHz and 4MHz ultrasound we were using, and we took care to de-air the mix while the expoxy resin was still liquid.

We used a couple of millimetres of this brew behind our (IIRR) lead zirconate titanate piezo-electric transducers, and a quarter-waveplate on the front as an impedance transformer.

It got the Q down to around two, at a guess.

Sounds like a good idea. In principle you could kill the residual energy in the transducer with a carefully tailored de-excitation pulse, but I've never heard of anybody getting anywhere with the idea.

--
Bill Sloman, Nijmegen
Reply to
bill.sloman

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