LED Modulation
Power consumption
problem can be solved with a lighting modulation technique. Instead of lighting
the skin continually the LEDis turned on only for a short time, say 100-1000ns
and the signal is sampled within the period. High frequency low duty cycle
modulation implemented minimizes LED power consumption.
Basic Principle Of Ring Sensor
Each time the heart
muscle contracts, blood is ejected from the ventricles and a pulse of pressure
is transmitted through the circulatory system. This pressure pulse when
traveling through the vessels, causes vessel wall displacement which is
measurable at various points inorder to detect pulsatile blood volume changes
by photoelectric method, photo conductors are used normally photo resistors are
used, for amplification purpose photo transistors are used
Working
The LEDs and PD are
placed on the flanks of the finger either reflective or transmittal type can be
used. For avoiding motion disturbances quite stable transmittal method is used.
Transmittal type has a powerful LED for transmitting light across the finger.
This power consumption problem can be solved with a light modulation technique
using high-speed devices.
Ring Sensor
It is a pulse oximetry
sensor that allows one to continuously monitor heart rate and oxygen saturation
in a totally unobtrusive way. The device is shaped like a ring and thus it can
be worn for long periods of time without any discomfort to the subject.
Abstract
Recent advancements in miniature devices have fostered a
dramatic growth of interest of wearable technology. Wearable Bio-Sensors (WBS)
will permit continuous cardiovascular (CV) monitoring in a number of novel settings.
WBS could play an important role in the wireless surveillance of people during
hazardous operations (military, firefighting, etc) or such sensors could be
dispensed during a mass civilian casualty occurrence. They typically rely on
wireless, miniature sensors enclosed in ring or a shirt.
Impact Of The Smart Shirt
The smart shirt will have significant impact on the
practice of medium since it fulfills the critical need for a technology that
can enhance the quality of life while reducing the health care cost across the
continuum of life that is from newborns to senior citizens, and across the
continuum of medical care that is from hospitals and everywhere in between.
Introduction
Wearable sensors and systems have evolved to the point that
they can be considered ready for clinical application. The use of wearable
monitoring devices that allow continuous or intermittent monitoring of
physiological signals is critical for the advancement of both the diagnosis as
well as treatment of diseases.
Future
Trends
By providing the
“platform” for a suite of sensors that can be utilized to monitor an individual
unobtrusively. Smart Shirt technology opens up existing opportunities to
develop “adaptive and responsive” systems that can “think” and “act” based on
the users condition, stimuli and environment. Thus, the rich vital signs delta
steam from the smart shirt can be used to design and experiment “real-time”
feedback mechanism (as part of the smart shirt system) to embrace the quality
of care for this individual by providing appropriate and timely medical
inspections.
Conclusion
The ring sensor and
smart shirt are an effective and comfortable, and mobile information
infrastructure that can be made to the individual’s requirements to take
advantage of the advancements in telemedicine and information processing. Just
as special-purpose chips and processors can be plugged into a computer
motherboard to obtain the required information processing capability, the smart
shirt is an information infrastructure into which the wearer can “plug in” the
desired sensors and devices, thereby creating a system for monitoring vital
signs in an efficient and cost effective manner with the “universal“ interface
of clothing.
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