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|Zak||Last replied to at December 20, 2015, 10:21 am|
This is my senior year project.
Basically i'm using two ultrasonic atomizers (1.65 MHz, 25 mm diameter)as a transmitter and a receiver and a blood sample in between,the signal will be transmitted through the blood sample till it reaches the receiver. As the blood sample coagulates (clotting), its viscosity will increase, thus the received signal will be attenuated gradually.
BUT... this is not happening!!! i'm sure that my setup is flawless, i have been working on it for 4 months.
The received signal have no particular pattern, in some experiments it increased, in others it decreased or just fluctuated randomly !! it is supposed to decrease (attenuate) gradually as the blood is clotting.
is it because i'm using atomizers ?? do they have different beam profiles than regular transducers?? aren't they suitable for such applications?? should i use a more focused transducer??
i'm using them because they are the only ones i could get.
PLEASE HELP ME..i only have 3 weeks till my seminar.
any help will be appreciated..thank you in advance.
|Spike||Last replied to at June 6, 2011, 11:54 pm|
That's 2 cleevr by half and 2x2 clever 4 me. Thanks!
|pj||Last replied to at May 13, 2010, 9:15 pm|
You may need check:
1: Theoretically, how much dB the coagullated blood will attenuate ultrasound at 1.65MHz
2: Assume you are using a pulsed signal for transmit and receive, how is the trigger? Are you receiving signal from transmitter or they are just noise?
3: During the experiment, make sure the relative location of transmitter and receiver didn't change.
4: If you can confirm 2&3, you should be able to see the attenuation from blood.