Where one can I obtain high sound pressure ultrasonic sensor of center frequency with more than 40KHz?

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Siddharth Advani

What is your end-application? We used EMATs operating at 270 kHz for NDE of steel plates. You can read more about it here Article Beam divergence calculation of an electromagnetic acoustic t...

Fady Samann

Dear Siddharth, thank you for your reply. i am working on mid-air haptics system using ultrasonic sensors. The currently available is 40khz sensor usually used for as car parking sensors.

Hi Fady, signal attenuation in air is pretty rapid as frequency is increased and that affects range of signal. You can try using an array of transducers @40kHz to increase the energy. Also, looks like the company you earlier mentioned does make a high frequency sensor. You can check it out here https://www.murata.com/en-us/products/productdetail.aspx?cate=cgsubUltrasonicSensors&partno=MA300D1-1

Dear Siddharth, I am aware of the attenuation and the use of array of 40khz transducers. I am experimenting with higher frequency transducers, because of as you know the near and far fields will get narrower when the frequency increases. I am also aware of the transducer that you note, but i am not sure of its sound pressure.

Wolfgang Bisle

There are a lot of opportunities with transducers developed for Air-Coupled Ultrasonic NDT.

Check e.g. for companies selling such equipment on www.ndt.net, which is the best platform for such topics.

Be aware, to optimize the acoustic match of e.g. piezos to air you need adapted matching layers.

Wolfgang Bisle thanks for the advice. However, I want to use the transducer for a Mid-Air Haptic device. I have a PhD proposal to enhance the current technique.

O.K.: if you shall enhance the current technique, than check this here:

Article Air-Coupled Piezoelectric Transducers with Active Polypropyl...

The polypropylene foam ferroelectret film are even in NDT a hot topic.

And the optical microphone from https://xarion.com/ is now the absolute top product concerning sensitivity and bandwidth. An array of those sensors can be used as acoustic camera / imager to locate any noise source etc. To do the "sound illumination" xarion offers thermoacoustic emitters.

Wolfgang Bisle , thank you for the last link. the transducer has a great focal point of 1mm and the sound preasure is good.