I want to find the resonance and anti-resonance frequencies of an ultrasonic transducer by analyzing its impedance.
so I need to buy a impedance analyzer or spectrum analyzer or something like that.
but my budget is limited.
do you recommend any device for my application and limited budget? :D
Hi. Shouldn't a plain multimeter do for a low budget solution?
According to the nature of your transducer you should be able to read maximum and minimum values of impedance/voltage/current associated to resonance and anti-resonance frequencies.
Sorry in advance for a maybe too blatant proposal.
If you want to measure impedance in a low cost way, get yourself
1) Suitable signal generator
2) An appropriately sized current sense transformer
3) a two-channel oscilloscope.
Measure the voltage and current as you vary frequency. Oscilloscope will give you the phase relationship between current and voltage across transducer. You can then calculate the real and imaginary components of impedance. I leave it as an exercise how you might calibrate this setup. Cheers!
Dear Ju Cheng
The commercial Impedance Analyzer is usually expensive. As an alternative, you can be a "Bode 100", below link shows more details:
https://www.omicron-lab.com/products/vector-network-analysis/bode-100
The price of Bode 100 is much cheaper than Impedance Analyzers but it can be used for impedance measurement purposes.
one can find VERY cheap vector networkanalyzers around 50 USD or Euro which are not so bad..of course but it also depends on the impedance range of the ultrasound transducer if its far away from 50 Ohm better use some impedance meter or the Bode 100 or similar..
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