Glass breaking sensor and Piezo Transducer

[hez_91]

Piezo Transducer

I am trying to stimulate a glass breaking sensor by using a Piezo Transducer to P18F4520.

Can any type of piezo transducer be used or do I have to find a specific piezo transducer to be compatible with the sound of breaking glass?

Thanks

 

[the mask]

Piezo Transducer

i thnk you can found it in bmw car

 

[diegobb]

Re: Piezo Transducer

I've used the piezo speaker of a christmas cards to record underwater sounds.
To amplify the signal, I've used an opamp amplifier (two JFET opamps). It worked very nice.
In ths case, you can also filter the signal in the opamp to get just some frecuencies in the output. I mean, record a glass break (or dowload it from internet), analyze the frecuencies, and then design your opamp amplifier to get just these frecuencies.

Regards

 

[FvM]

Re: Piezo Transducer

Usual glass-break detectors are sensing solid-born sound, mainly in the ultrasonic range. They require the sensor directly glued to the pane.
The expectable amplitude is high and can be detected typically without an amplifier, e.g. by triggering a thyristor.