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Ian Bell
03/02/06 14:58
Read: 440 times
Northrepps
United Kingdom


 
#111112 - Ultrasound
Responding to: Jez Smith's previous message
I have seen something similar before where the solution used was ultrasound. In that example the fluid was an oil so wavelengths and hence frequencies were different. Anyway the basic principle is to sweep an emitter on one side of the pipe and listen with a couple of spaced receivers on the other side. At low frequencies the wavelength is greater than the mean particle size and both receivers pick up. As you approach the mean particle size, diffraction begins to take place and one reciver dips and the other rises in output. At wavelengths shorter than the mean particle size the output begins to increase again.

Of course you need to be carefull to distinguish mean particle size from mean particle separation which also produces a similar effect but at a different frequency.

More than that I cannot say due to NDA.

Ian

List of 12 messages in thread
TopicAuthorDate
Mean particle size      Jez Smith      03/02/06 14:07      
   Prices lovely prices      Steve M. Taylor      03/02/06 14:29      
   Mean particles      Andy Neil      03/02/06 14:36      
      Meanies      Steve M. Taylor      03/02/06 14:46      
   Ultrasound      Ian Bell      03/02/06 14:58      
   Maybe      Kai Klaas      03/02/06 18:59      
      Jokes and an answer :-)      Jez Smith      03/03/06 00:05      
         Results      Ian Bell      03/03/06 03:34      
      Coulter counter      Steve M. Taylor      03/03/06 05:53      
         wheres my money then??      Jez Smith      03/03/06 10:30      
   Flow cytometry      Oliver Sedlacek      03/06/06 02:44      
      yep but a leetle bit expensive      Jez Smith      03/06/06 05:20      

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