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RF, Microwave, Ham Radio / Re: Detecting very low power motion sensors
« Last post by ejeffrey on Today at 01:23:29 am »
TinySA Ultra can detect motion sensor frequencies around 10 GHz, in these examples
I thought it only went to 6 but I now see there is a higher frequency version. My understanding is that it has much worse sensitivity above 6 GHz so I would count on it working.
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Could ultrasonic sensors work reliably through a wall ?
Is it possible to somehow detect the emissions of ultrasonic sensors placed behind a wall ?
Depends on the wall and the sensor. Going from wall to air, reflecting, back to the wall and to the sensor is probably a tall order? It's also possible to hide things by e.g. drilling a hole in the wall, mounting sensors in the hole, skim coating it and painting over.
A microphone with an audio signal analyzer would work as long as the microphone works up to the frequency in use. I think the things used in parking sensors are like 40 kHz?