Monitoring heartbeat from few centimeters from a victim

[pisoiu]

Is it possible to detect the heartbeat of a person within a proximity of few centimeters away from the body? The scope is to detect the removal of a device which must be kept near the body all the time, but in most of the cases, the person in unaware of the presence of the device.

/pisoiu

 

[flatulent]

Re: Heartbeat detection

The two standard methods will not work. One is the electrical pickup of electrodes on the skin. The other is an accelerometer on the body.

Perhaps some form of capacitance method would work. Two plates are in a plane and the presence of the body increases the capacitance between them.

 

[IanP]

Re: Heartbeat detection

Here is a detection system suggested by the Russians:
"Detection of Human Breathing and Heartbeat by Remote Radar "
**broken link removed**

Regards,
IanP

 

[pisoiu]

Heartbeat detection

I apologise for the lack of details, the device is a GPS tracker, for childrens survey , so it has to be mobile.

/pisoiu

 

[flatulent]

Re: Heartbeat detection

What if the harness had electrical contact through the fastener? The fastener would open contact when the harness was removed. Another thing to measure is magnetic field direction. Children are always moving around. If the vector of the earth's magnetic field sudden stayed stationary you would know the device had fallen off the child.

 

[pisoiu]

Re: Heartbeat detection

......... Children are always moving around. If the vector of the earth's magnetic field sudden stayed stationary you would know the device had fallen off the child.

Thanks, great idea. I think an accelerometer will do the job.

/pisoiu