FoxyRick
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1 mhz ultrasound
Hi,
I need some help driving a powerful(ish) piezo-electric ultrasound transducer. Here's the background...
I have an old ultrasound therapy machine that has stopped working (again). The circuit is quite complex, and is controlled by an MCU, and I think it would be better to build a completely new driver for the ultrasound transducer, rather than repair this thing again. It's the size of a tank!
The machine is intended for deep tissue massage - it's great, after a minute you can feel the muscles inside getting warm - it really relieves muscle aches and problems. Mine was intended for use on race horses - it worked well on my back though!
Anyway, the machine drives the transducer with these settings:
Frequency: 1MHz or 3MHz
Power: Pre-set selectable limits, up to 2W/cm²
Pulsed or CW
The power meter used to move (a lot) depending on what type of tissue was being massaged. I don't want to just drive the transducer with anything, as ultrasound can damage tissue if too powerful (don't want that!)
So, I need to know:
1. What sort of drive circuit do these transducers need? (what voltage/waveform/current)
2. How exactly do we measure the power it is giving? (is it just a case of voltage x current / area of contact)
3. Any advice on how to limit the power output?
*Any* advice would be useful, my back is aching and I need my ultrasound! I have asked the manufacturers, who are only interested in selling me a new one (£800) and googled with no useful results.
Thanks,
FoxyRick.
Hi,
I need some help driving a powerful(ish) piezo-electric ultrasound transducer. Here's the background...
I have an old ultrasound therapy machine that has stopped working (again). The circuit is quite complex, and is controlled by an MCU, and I think it would be better to build a completely new driver for the ultrasound transducer, rather than repair this thing again. It's the size of a tank!
The machine is intended for deep tissue massage - it's great, after a minute you can feel the muscles inside getting warm - it really relieves muscle aches and problems. Mine was intended for use on race horses - it worked well on my back though!
Anyway, the machine drives the transducer with these settings:
Frequency: 1MHz or 3MHz
Power: Pre-set selectable limits, up to 2W/cm²
Pulsed or CW
The power meter used to move (a lot) depending on what type of tissue was being massaged. I don't want to just drive the transducer with anything, as ultrasound can damage tissue if too powerful (don't want that!)
So, I need to know:
1. What sort of drive circuit do these transducers need? (what voltage/waveform/current)
2. How exactly do we measure the power it is giving? (is it just a case of voltage x current / area of contact)
3. Any advice on how to limit the power output?
*Any* advice would be useful, my back is aching and I need my ultrasound! I have asked the manufacturers, who are only interested in selling me a new one (£800) and googled with no useful results.
Thanks,
FoxyRick.