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These are slides about blood flow meters and sensors with introduction to a new technology of flexible sensors that can be used as a lie detector ... slides have prepared by me with a great hardwork on material,animations and transitions.
BLOOD IS A CONTINOUSLY VARYING QUANTITY and hard to measure .it can be magnetized to create polarity so that we measure the blood flow . blood can also be sensed using ultrasonic beams.
and the precious and amazing technology is FLEXIBLE SENSORS that can sense blood and measure its velocity . they can sense even a very very small change in the temprature of blood upto 3 decimal places . So see it in my slides and enjoy . hope u will satisfied by it .
An instrument for
measuring the velocity
of flow of a fluid (as blood)
in a tube or pipe
Blood flow is a time
varying quantity and
parameter to be
Need For Blood Flowmeter ?
info about the
various parts of
blood flow vary
over a wide
on diameter of
block in blood
Blood Flow meter
Ultrasonic Blood Flow
Laser Doppler Blood
1.Electromagnetic Blood Flow Meter
Works based on the principle of
“The voltage induced in a conductor
moving in a magnetic field is
proportional to the velocity of the
The conductive blood is the moving
It is invasive technique
Electromagnetic Blood Flow Meter
A permanent magnet or electromagnet positioned around the
blood vessel generates a magnetic field perpendicular to the
direction of the flow of the blood.
Voltage induced in the moving blood column is measured with
stationary electrodes located on opposite sides of the blood
vessel and perpendicular to the direction of the magnetic field.
This method requires that the blood vessel be exposed so
that the flow head or the measuring probe can be put across
2.Ultrasonic Blood Flow Meter
Ultrasonic waves are
ideal for non-invasive
A moving blood cell
changes the frequency
of sonic waves before
and after it.
The sonic waves
compress before an
object and spread out
This frequency shift is
the Doppler Effect
Ultrasonic Blood Flow Meter
These devices include a transmitter and
Reflective material bounces the transmitted
wave back into the receiver.
The received wave has a frequency shift. The
source frequency is lowered twice.
The first shift occurs when the transmitted
wave hits the object and the second shift
occurs when the resulting wave comes back .
3.Laser Doppler Blood Flow Meter
Principle of laser Doppler Flowmetry
Red light is emitted from a light source; if the light beam is scattered-off of stationary tissue or cells, there is
no shift in the light spectrum. If, however, the light hits a moving cell in a blood vessel there is a shift in the
light spectrum of the scattered light according to the Doppler flowmetry
American National Standards Institute (ANSI) Definition
o A device which provides a usable output in response to a specified
A sensor acquires a physical parameter and converts it into a signal suitable
for processing (e.g. optical, electrical, mechanical)
University of Illinois at Urbana-
Champaign has developed a
flexible electronic sensor that
can measure blood flow on top
of the skin or, can possibly be
implanted onto the tissues
Flexible sensor that can
stick onto the skin like a
The devices are made from a thin array of
metallic wires that are oriented around a
central sensor and map blood flow as well as
pick up on the slight temperature increase that
each pulse of blood brings
They are coated in a thin layer of silicone, so
they are flexible and can stick to the skin like
Can determine temprature to the third
decimal place and accurately track the
change at that level, it provides a lot of deep
insight into physiological health
Could potentially be used for lie detector
Devices Market, by