“Thousands of persons killed as a cause of earthquake”. The above words aren’t the headlines of the newspaper but daily news everyone come across whenever we go through a newspaper or watching over a TV news.
A person’s life is precious and meaningful to his loved ones.
We, as responsible Engineers felt a part of society to bring a system to avoid these mishaps. With the meteoric Embedded systems along with microprocessor our designed system in preventing deaths and providing safe guided measures.
A new revolutionary
microwave life detection system, which
is used to locate human beings buried
under earthquake rubble, has been
designed. This system operating at
certain frequency can remotely detect
the breathing and heartbeat signals of
human beings buried under earthquake
rubble. By proper processing of these
signals, the status of the person under
trap can be easily judged. The entire
process takes place within a few seconds
as the system is controlled by a
microprocessor (8085) or
By advent of this system
the world death rate may decrease to
greater extent as large percentage of
death occur due to earthquake.
At present as we all know the need of
the hour is to find an effective method
for rescuing people buried under
earthquake rubble (or) collapsed
building. It has to be done before we
methods for searching and rescuing
victims buried (or) tapped under
earthquake rubble are not effective.
Taking all the factors in mind, a system,
which will be really effective to solve
the problem, has been designed.
[pic]The basic principle is that
when a microwave beam of certain
frequency [L (or) S band (or) UHF band]
is aimed at a portion of rubble (or)
collapsed building under which a person
has been trapped, the microwave beam
can penetrate through the rubble to
reach the person.
When the microwave
beam focuses the person, the reflected
wave from the person’s body will be
modulated (or) changed by his/her
movements, which include breathing and
heartbeat. Simultaneously, reflected waves are also received from the
So, if the reflected waves
from the immovable debris are
cancelled and the reflected wave
from the person’s body is properly
distinguished, the breathing and
heartbeat signals can be detected.
By proper processing of
these signals, the status of the person
under trap can be easily judged. Thus a
person under debris can be identified.
Major components of the circuit:
The microwave life detection system has four major components. They are
1. A microwave circuit that generates amplifies and distributes microwave signals to different microwave components. 2. A microwave controlled clutter cancellation system, which creates an optimal signal to cancel the clutter from the rubble. 3. A dual antenna system, which consists of two antennas, energized sequentially. 4. A laptop computer that controls the microprocessor and acts as the monitor for the output signal.
The frequency of the
microwave falls under two categories,
depending on the type and nature of the
collapsed building. They are :
1. L (or) S band frequency say 1150 MHz
2. UHF band frequency say 450 MHz
The circuit description is as follows:
Phase locked oscillator:
The phase locked
oscillator generates a very stable
electromagnetic wave say 1150 MHz
with output power say 400mW.