Hello all,
I like to measure speed of sound in porous scaffolds. I have characterized physical properties of each scaffolds (i.e. Elastic Modulus, porosity and etc.). In my setup, using a transducer I send out pressure waves and using a hydrophone, I measure the delay in arrival due to the presence of scaffolds in the path. Using the equation below, I can calculate the speed of sound in my scaffolds submerged in the water.
c=thickness/(thickness/Cw-delay) (CW is speed of sound in water)
The calculated speed of sound is contribution of both of the solid phase of scaffold and the water that filled pores. I would appreciate it if you can suggest a way on how to find the speed of sound in the solid phase of my scaffold?
Thanks,
Hamed
If you know the entire thickness of the porous material and you can measure the time of flight coming from the back surface, then you can estimate the velocity of the material.
average velocity = (sum of total distance)/(sum of total time)
sum of total distance = distance of material + distance of water
sum of total time = time of flight of material + time of flight of water
average velocity = (velocity of material + velocity of water)/2
solve for the velocity of the material. Use a low frequency transducer to avoid excess scattering and attenuation.
Hello Ronald,
Thank you for the response. By the assumption that my material is 80% porous, should last equation be modified to:
average velocity = (0.2*velocity of material + 0.8*velocity of water)
Could you please refer me to a source that explain this formulation?
Thanks,
Hamed
Hi Abdolrasol, I'm just giving you some direction here, not to solve your problem. Think about what an average is xbar=(sum of x)/(count of x). You can find the average velocity formula in any middle school math text book or work it out using differential calculus.
Regards
Ron
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