Research shows that applying 1 MHz non-focused ultrasound at 3 W/cm2 may reduce subcutaneous fat thickness. In fact, high-end and expensive (costs $5000 >) HIFU ultrasonic transducers are now being used in cosmetic clinics that allow the user to regulate ultrasound frequency, pulsing, power and time in order to target body fat.
To my surprise, I noticed that one can also buy inexpensive (costs only $50), portable 1Mhz Ultrasound cavitation device from Ebay or Aliexpress that also claims to reduce body fat. Scam or not, one way to justify its claim will be to measure and verify the emitting frequency and intensity.
I bought such a device from Aliexpress (costed $130) to play around with it. My skin can feel a definite vibration when I turn on the device, however, it is very hard to tell if ultrasound is actually exciting my tissue lesions.
I want to know how to set up an inexpensive testing setup and:
1) Find out if the device is really emitting ultrasound. If yes, how would I measure its frequency? Device manual says 1MHz, but I suspecting it might be a bs.
2) How to measure the intensity and penetration depth. Finding one value should lead me to calculate another.
3) Find out if the device's ultrasound is focused or non-focused. My gut feeling is the ultrasound is non-focused or weakly focused.
One way to find more clues would be to rip through the device and look at the transducer circuit. The transducer hardware might have a model number that can be used to find it's spec sheet online. However, I haven't unscrewed the device yet and I doubt I would find anything helpful on the circuit board as it probably came directly from a questionable Chinese factory.
Further reading: There has been plenty of research conducted so far regarding effects of non-focused ultrasound on animal contouring: