Analog Mems Microphone for Ultrasound Range

[Nabila Gina Nastiti]

Posted on January 28, 2018 at 17:21

Hello everyone,

I apologize if my question is too basic for this forum but i've been reading so many sources in the internet and i am still confused and I am pretty much new in this subject.

I want to hear ultrasound by using analog mems microphone between  range 20 kHz and 200kHz. I have several different types of mems analog microphone (

SPU0410HR5H?PB, SPU0410LR5H-QB, ICS-40180) and electret (CMA-4544PF-W). I know that the range is out of the hearing range of these microphones, however i read that it could be done. Could someone please share some idea how to do this ? 

Thank you for your attention

Gina

#ultrasound #mems-microphone

[Andrew Neil]

Posted on February 21, 2018 at 19:53i read that it could be done

Where did you read that? Have you contacted whoever wrote it?

Why not just use a transducer specifically designed for this purpose?

[Andrew Neil]

Posted on February 21, 2018 at 20:39

http://www.lmgtfy.com?q=ultrasonic+MEMS+Microphone

 

[T J]

Posted on March 14, 2018 at 12:21

The reason microphones wont work for ultra sound is because  microphones work in air and ultrasound works in water.

the difference in density is huge, 784x exactly.

sounds sent through water don't transmit well in air,

the microphones are silent.

usually many ultrasonic receivers are mounted within the same transmit head, embedded in a similar liquid density as the body.

[Andrew Neil]

Posted on March 14, 2018 at 12:39

T J wrote:

The reason microphones wont work for ultra sound is because  microphones work in air and ultrasound works in water.

Sorry, that's nonsense!

Of course ultrasound also 'works' in air!

Remember when TV remote controls used ultrasound?

Ultrasonic ranging is widely used in car reversing aids, robotics, etc

And, of course, bats rely upon it!

But most things called 'microphones' are specifically designed for audio purposes.

Here is a MEMS microphone with ultrasonic capabilities: 

http://www.knowles.com/eng/Newsroom/New-product-Ultrasonic-MEMS-Microphone

 

[T J]

Posted on March 14, 2018 at 13:21

My bad,

I thought he was working on anatomy.

:(