photoplethysmographic cardiotachometer
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8/16/2019 PHOTOPLETHYSMOGRAPHIC CARDIOTACHOMETER
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PHOTOPLETHYSMOGR
APHICCARDIOTACHOMETER
PRESENTED By
A.DHANUJA
M.NAGAVARSHINI
S.PAVITHRA
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OUTLINE
What is photoplethysmographic cardiotachometer ?
Objective
Algorithm
Signal Extraction
Signal conditioning
Peak detector
Overall setup
App Development
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WHAT ISPHOTOPLETHYSMOGRAPHIC
CARDIOTACHOMETER ? Photoplethysmography !ardiotachometer!ardiotachometer –A heart rate monitor
Photoplethysmography"
Photo + PlethysmographyPlethysmography-A measurement technique used
to measure the volume changes in di##erent parts
o# the body$
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OBJECTIVE
To measure heart rate
Why not use stethoscope ?
Why not E!% ?
And why PPG cardiotachometer ?
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ALGORITHM :
The Signal from the finger tip
is etracted !y using the principleof photoplethysmographic
transduction "
The signal is then conditioned as
the raw signal from the sensor is
quite wea# and is contaminated
with noise on the top of the $%
component"
Peak Detection using Sliding and
%lim!ing Pea# detection method"
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SIGNAL EXTRACTIONPRINCIPLE:
Photoplethysmography -
&easures changes in the
volume o# the blood
in the blood vessels !y
the reflection or
transmission of the light
from or through the
tissue "
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WHAT CAUSES CHANGE IN VOLUME OF BLOOD ?
When the 'entricles of the heart
contracts (the volume of the !lood
in the !lood 'essels( mostly in
arteries increases ( there!y the
amount of light absorbed increases
so light re#lected or transmitted
decreases"
When the 'entricles of the heart
relaxes( the volume of the !lood in
the !lood 'essels( mostly in arteries
decreases( the amount o# light
absorbed there!y decreases so light
re#lected or transmitted increases"
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HOW IS ELECTRICAL PULSATION GENERATED ?
The change in the 'olume ofthe !lood within the artery will
directly affect the reflection
from or transmission through
the tissue to !e recei'ed !y the
photo detector thus generating
an electrical pulsation relatedto plethysmography"
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SIGNAL CONDITIONING
The signal is then conditioned using filters as the raw signal
from the sensor is quite wea# and is contaminated with noiseon the top of the $% component"
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Peak detet!"
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OVERALL SETUP
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