Sound/Signal Propagation through glass?

[sophiecentaur]

It does not necessarily need to be ultrasound but I was under the impression that it would work better.

What do you mean by matching my power into the glass?

When a wave passes across a boundary between two media with different wave speeds (acoustic impedance), energy is reflected. The bigger the ratio of the two speeds, the more energy is reflected - hence the jelly that is excludes the air between ultrasound head and tummy - to exclude air. The scan works because of the small amount of power, reflected at the boundary between different tissue densities (speeds).

Any ultrasound transducer will be designed for a particular medium, to avoid the problem of getting power in, in the first place. Water /glass etc have very different speeds from air so reflections are particularly problematic when air is involved. This is why I asked about the original purpose for your transducer. Also, what is the sort of power it produces? A transducer used in an ultrasonic cleaning bath would be matched to the water (natch) but a School Demo ultrasound transducer would be suited to air. Matching the 'wrong one' involves a 1/4 wavelength layer of an intermediate density material not trivial.

If there is a particular job you want this to do then a few more details could be useful.

 

[fiza]

Hi, is this a set-up for ultrasound NDT testing? May I know your set up and where do you get the glass sample?

 

[davenn]

Hi, is this a set-up for ultrasound NDT testing? May I know your set up and where do you get the glass sample?

Hi fiza,
Welcome to PF
THis thread is over a year old, the original posted hasn't returned since then, he may no longer be aroundDave