Hi all
Does any one know about the QCM sensor with rectangular electrodes on both sides?
I have not found any paper related to this configuration of QCM sensor
Dear Nhan,
I have never heard of QCM sensors with rectangular electrodes. Usually, the best configuration is with circular electrodes that can be made of silver or gold depending on the application. Why are you interested in rectangular electrode configuration?
Sincerely,
Karekin
I found something that might be useful to you - http://lnu.diva-portal.org/smash/record.jsf?pid=diva2%3A168062&dswid=-8620
Hi Dr.Karekin Esmeryan
I think rectangular electrode is possible. I simulated on COMSOL, the result indicates that the distribution of sensitivity.
In my opinion, the electrode of QCM is circle because of the isotropic frequency of QCM.
Dear Dr.Phat Huynh. You're right. Circular electrode for QCM is the best choice as you said.
However, according to Dr.Karekin Esmeryan reference, rectangular electrodes have more sensitivity and noise than circular. So I think the rectangular electrode is possible if only use the central region of the electrode for sensing because the distribution of sensitivity not uniform on the whole of the rectangular electrode.
Anyway, thanks so much for the reply. This is the first time I know that we have a Biosensor lab in HCMC.
Dear Nhan ,
I know about the quartz crystal with rectangular electrodes on both sides, it's frequency is about 1.8MHz. I used it for measuring dew point six years ago. This type of quartz crystal is not a planar structure, its surface is a curved surface. It is not suitable for me to design the structure, so I gave up. This type of quartz crystal usually used as pressure sensor.
Dear Dr.Jing Nie. Thanks so much for sharing your experiences.
In my view point, I think that the rectangular shape for both electrode and quartz plate is OK. However, we MUST pay more attention to optimal the size of them to remove or restrict the effect of spurious vibration.
For example, in case of the AT-cut Quartz plate, beside the TS mode, some spurious modes likes: flexure mode or extensional mode will occur also. By selecting the proper dimension of the quartz plate, we can restrict these spurious modes, and by obtaining the thickness & size of the electrode, we can partially make sure that the performance of QCM sensor would be the best.
Anyway, these above just theory, I am trying to simulate on COMSOL to find the optimal parameters for my device.
If you have any experiences to solve the PDE of Mindlin Equation or Mathieu equation in COMSOL, please help me.
Best regards
Nhan ND
Theoretically the electrode shape should have no effects on the bulk wave, but the edge effect needs to be considered. The noise is too large.
Dear Dr.Pengtao Wang.
Your picture is so impressive to me. Could you share with me your related paper ?
Best regards
Nhan ND
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