Thanks for this suggestion. I'll make sure to get more probes running simultaneously. The analog discovery only has two channels. However, I have a 8-channel Hantek USB oscilloscope that would be perfect! I will use it next time.
I was hoping you would do a RF type impedance matching, measuring the transducer impedance then matching that to the drive impedance for maximum power transfer. You could use a smith chart although most people would tune out if you started that but you could just tune the capacitance of the transducer with some inductance in the transformer at the operating frequency. I’ve seen more than one ultrasonic cleaner manufacturer adjust the air gap of the drive transformer to tune to the transducers. They have screws as part of the core mounting that can be adjusted very finely. RF engineers have been doing impedance matching forever, at least since before WW2. Since these devices are usually narrow bandwidth you can impedance match to a complex load with a simple L-C network introducing a transformer if you really need it (if the ratio is very big it’s better to use a transformer than try with a simple network). The transformer would usually be an auto transformer type thereby making the inductor and transformer the same device.
Thank you for adding your detailed reply (both technical and historical!). I haven't gotten around to true impedance matching, but hopefully someone interested will find your comments ultra useful. Many of the ultrasonic transducer that I've worked on, especially surgical transducers, operate under a large variation of loading/impedance and drive power levels. For that reason, the goal has been to get "enough" efficiency to satisfy the maximum load and the maximum power from the amplifier's available. Definitely, when getting in the 100's of W range and the kW range impedance matching is a requirement as inefficiencies on that scale are gonna burn something.
Please we need your help and support to know name of the best adhesive transparent glue which used to install the piezo ceramic disc on plastic Base without affecting on performance. *Application :Ultrasonic sensor for milk analyser , * idea is copper tupe and two piezo discs one of them is transmitter and another is receiver *Spesfication of piezo : Size : OD 5mm, thickness 0.5mm, 4Mhz Thanks in advance
Hello Husain, a simultaneous Picoscope view of the load Voltage and Current waveforms with phase angles would aid your explanation immensely.
Thanks for this suggestion. I'll make sure to get more probes running simultaneously. The analog discovery only has two channels. However, I have a 8-channel Hantek USB oscilloscope that would be perfect! I will use it next time.
I was hoping you would do a RF type impedance matching, measuring the transducer impedance then matching that to the drive impedance for maximum power transfer.
You could use a smith chart although most people would tune out if you started that but you could just tune the capacitance of the transducer with some inductance in the transformer at the operating frequency.
I’ve seen more than one ultrasonic cleaner manufacturer adjust the air gap of the drive transformer to tune to the transducers. They have screws as part of the core mounting that can be adjusted very finely.
RF engineers have been doing impedance matching forever, at least since before WW2. Since these devices are usually narrow bandwidth you can impedance match to a complex load with a simple L-C network introducing a transformer if you really need it (if the ratio is very big it’s better to use a transformer than try with a simple network). The transformer would usually be an auto transformer type thereby making the inductor and transformer the same device.
Yes, I agree with your comments.
Thank you for adding your detailed reply (both technical and historical!). I haven't gotten around to true impedance matching, but hopefully someone interested will find your comments ultra useful.
Many of the ultrasonic transducer that I've worked on, especially surgical transducers, operate under a large variation of loading/impedance and drive power levels. For that reason, the goal has been to get "enough" efficiency to satisfy the maximum load and the maximum power from the amplifier's available. Definitely, when getting in the 100's of W range and the kW range impedance matching is a requirement as inefficiencies on that scale are gonna burn something.
Please we need your help and support to know name of the best adhesive transparent glue which used to install the piezo ceramic disc on plastic Base without affecting on performance.
*Application :Ultrasonic sensor for milk analyser ,
* idea is copper tupe and two piezo discs one of them is transmitter and another is receiver
*Spesfication of piezo : Size : OD 5mm, thickness 0.5mm, 4Mhz
Thanks in advance