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'[ot]: Heart monitor??'
2000\12\22@104133 by rad0

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Hello Picster's,

Seasons' Greetings to all...

I was wondering how do the Polar heart monitors
work?  Do they use a microphone or something else.

I didn't think you could use a vibration sensor, (I don't
know what this would even be, exactly), because they
work while the person is running and exercising, etc..

So, how do these polar heart monitors work, OR,
what's a good reliable way to monitor your heart.

Non-invasively, that is.  I know you jam a metal probe
in there and measure the current, but I want the user to
survive...8-)

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2000\12\22@110307 by Dan Michaels

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At 09:43 AM 12/22/00 -0600, you wrote:
>Hello Picster's,
>
>Seasons' Greetings to all...
>
>I was wondering how do the Polar heart monitors
>work?  Do they use a microphone or something else.
>
>I didn't think you could use a vibration sensor, (I don't
>know what this would even be, exactly), because they
>work while the person is running and exercising, etc..
>

Electrical pickup via electrodes on under side of belt,
triggers a transistor amp which is biased for class C
operation [normally zero battery drain], which pulses
some kind of LC ckt that rings at about 2-5Khz for a
couple of msec. Wrist watch uses a simple inductive
tuned ckt to pick up the signal from the belt.

- danM

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2000\12\22@122401 by rad0

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er..uh... sorry

is 'ckt' short for circuit?

thanks
I don't even know LOL means,, I dumb to the acronyms for some reason

{Original Message removed}

2000\12\22@131212 by Dan Michaels

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At 11:25 AM 12/22/00 -0600, you wrote:
>er..uh... sorry
>
>is 'ckt' short for circuit?
>
>thanks
>I don't even know LOL means,, I dumb to the acronyms for some reason
>

yes, "LC ckt" = inductor-capacitor circuit. [but don't ask me why
an L is an inductor, while a C is a capacitor].

An "LOL ckt" would be a laughing out loud circuit, designed
on or about 1 April to confuse the newbies and trip up the
old timers :).

- danM

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2000\12\22@142243 by rad0

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Hey Thanks,

It's probably for tesLa -;)

But, Do you think you could build a heart monior
using a microphone?  Or some way of monitoring the heart
through clothing,

or even some way at a distance?
any ideas?

Thanks


{Original Message removed}

2000\12\22@143330 by Dan Michaels

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At 01:19 PM 12/22/00 -0600, you wrote:
>Hey Thanks,
>
>It's probably for tesLa -;)
>
>But, Do you think you could build a heart monior
>using a microphone?  Or some way of monitoring the heart
>through clothing,
>
>or even some way at a distance?
>any ideas?
>

Of course, this would simply be an electronic stethoscope.
All methods have their problems. With sound, it is
movement and breathing artifacts. Possibly with adequate
filtering, these can be dealt with. I am sure there are
1000s of papers written on this stuff in the medical
literature.

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2000\12\22@162919 by Nigel Goodwin

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In message <000c01c06c4c$1f5df720$4968fea9@Sony>, rad0
<EraseMErden25spam_OUTspamTakeThisOuTMINDSPRING.COM> writes
>Hey Thanks,
>
>It's probably for tesLa -;)
>
>But, Do you think you could build a heart monior
>using a microphone?  Or some way of monitoring the heart
>through clothing,

A few years ago I went round a coal fired power station on an open day,
one of the items they demonstrated was an audio pickup device which they
attach to various parts of the plant. This fed a chart recorder which
enabled them to spot any changes in vibration in the machinery -
signifying a possible problem. For the demonstration they strapped it
round my wrist, the result was a really nice heart beat on the chart
recorder - just like you see on the hospital programmes :-).

Hospitals also use an acoustic pickup to monitor a babies heartbeat in
the womb, by carefully arranging it on the 'bump' a nice clear
indication can be heard and recorded.
--

Nigel.

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