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Piezo film sensor for footstep detection

will_hs

I’m currently looking into detecting footsteps on a wooden floor using piezoelectric sensors and recording the output as audio.

 

After some research it seemed like a cantilever piezo film sensor might be suitable. I have ordered a few of these (MiniSense 100, LDTM-028K).

I’m wondering if there is a optimal way to mount these sensors to maximise vibrational transfer. At the moment I have soldered the sensor to a small PCB and have the PCB attached to the floor with adhesive tape. I’m amplifying the signal with a jfet preamp. I’m finding that footsteps around 6” from the sensor are barely registering above the noise floor.

 

Any advice on mounting these sensors, or even suggestions for other sensors that might be more suitable, would be much appreciated!

Thanks

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  • Piezo sensors generate signals by bending. The larger and faster the bend, the larger the signal.

    If you can set it up so the sensor is a cantilever that gets slightly bent when a footstep occurs, you can get a very large signal (80V).

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  • Piezo sensors generate signals by bending. The larger and faster the bend, the larger the signal.

    If you can set it up so the sensor is a cantilever that gets slightly bent when a footstep occurs, you can get a very large signal (80V).

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