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Measuring breathing patterns

Discussion in 'Electronic Design' started by damn, Jan 2, 2006.

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  1. damn

    damn Guest

    Hi all,

    I suffer from somewhat bad sleep, most likely because of an allergy.
    I very much would like to monitor my breathing at night to get a relation
    in between bad sleep and breathing problems.

    I was thinking of doing this by measuring the temperature of the air
    getting out of mounth and/or nose.

    This requires a fast and accurate temperature sensor. The output of this
    sensor will be connected to a A/D board connected to my PC.


    Does anyone have any hints on what temperature sensor to use?


    Thank you!



    B.
     
  2. Rich Grise

    Rich Grise Guest

    Why not use one of those strap thingies? It's a band you wrap around
    your chest, with a sensor that detects when it stretches when you
    inhale.

    Or, for temperature, look up "thermistor".

    Good Luck!
    Rich
     
  3. damn

    damn Guest

    Well, for one, I'd like to see what happens with mount-breathing versus
    nose-breathing. The allergy blocks my nose, so I'd like to see how that
    interacts.

    Thermistor: thx for the info!



    B.
     
  4. Bob Monsen

    Bob Monsen Guest

    You can get a test done, where they wire you up and keep track of all of
    this while you sleep. It is used to diagnose apnea, which is fairly
    dangerous over a period of time.

    One other thing to worry about is carpeting in the bedroom, and not
    washing your bedding often enough. The medical community recommends
    washing in 140F water every week. They also recommend getting rid of
    carpeting, and replacing it with a hard floor of some kind, which will not
    harbor mites, or the bacteria they themselves harbor. Apparently, this
    bacteria can cause breathing problems even in non-asthmatics. (I was
    just reading about all this while waiting in my doctor's office... ;)

    --
    Regards,
    Bob Monsen

    "Physiological experiment on animals is justifiable for real
    investigation, but not for mere damnable and detestable curiosity."
    -- Charles Darwin
     
  5. JeffM

    JeffM Guest

    No need to reinvent the wheel (badly):
    http://www.google.com/search?q=define:plethysmograph

    http://groups.google.com/group/sci..../f710a6cf6d46de83?q=Inductance-plethysmograph
    http://www.google.com/images?q=Inductive-plethysmograph
    http://www.google.com/images?q=Inductance-plethysmograph
    http://www.google.com/search?q=Inductive-plethysmograph
    http://www.google.com/search?q=Inductance-plethysmograph
     
  6. Mark

    Mark Guest

    A tiny bead thermistor works fine for this putpose - Use a resistor and the
    thermistor as a voltage divider feeding an adc from the center and using the
    driving voltage to the divider as the reference voltage to make it
    ratiometric. Then devise an algorithm to detect the increase in temperature
    as you exhale.

    You don't need precision because you don't care what the actual temperature
    is, only the change. I use this technique in a product I sell to monitor
    respiration in anesthetized animals and using 10 bits I can very reliably
    detect breaths in animals ranging from tiny kittens to 250 pound St.
    Bernards.

    Mark
     
  7. Marc Popek

    Marc Popek Guest

  8. How true that is. Many folks stumble upon a concept and think that it is
    unique.
     
  9. damn

    damn Guest

  10. damn

    damn Guest

    Very nice stuff, only it doesn't register if you're doing nose-breathing
    or forced mouth-breathing.
     
  11. damn

    damn Guest

  12. damn

    damn Guest

    had three of those studies done, so that's pretty familiar to me :)

    the stuff you mention about the mites indeed confirms what my doctor
    advised me, next to buying special anti-mite bedstuff.

    thx!

    B.
     
  13. Geoff

    Geoff Guest

    Try this. I un-wrapped the URI but if your news client auto-wraps it
    will still fail. When that happens I copy-paste the broken URI into a
    text editor, fix it and copy that into a browser.
     
  14. JeffM

    JeffM Guest

    http://www.google.com/search?q=define:plethysmograph
    I haven't seen a clinician who worried about that.
    The indication of *good breathing* is **tidal volume**.
    ..
    ..
    BTW. have you considered following the standard practice
    and NOT top-posting?
     
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