10-11-2012, 06:19 PM
Night Vision Car
NIGHT VISION CAR.ppt (Size: 2.94 MB / Downloads: 271)
WHAT DOES THE SYSTEM USE
Dual camera
Amplifier
On board display
Caution ICU
Intelligent night vision system
Motion detection sensor
SENSORS USED
Vehicle Speed Sensor
Daylight Sensors
Night Vision Sensor
Vehicular Output Sensors
A signal processor translates the thermo gram data to an image suitable for display on a monitor.
the range of an FIR system was over three times further than that obtained with NIR — 119 m compared with 35 m.
HOW DOES THE SYSTEM WORK?
Near-infrard band at a wavelength of about 1 micrometer.
Human visual range is about 0.4 to 0.7 micrometers.
NVD's rely on ambient light, often from the moon and stars.
The intensifier tubes use the photoelectric effect.
As a photon collides with a detector plate, the metal ejects several
electrons that are then amplified into a cascade of electrons that light
up a phosphor screen.
The night vision image does not have color information, and hence monochromatic displays are sufficient.
A green phosphor (P22) display is generally used as the human eye is most sensitive to the color green in this wave length, which falls in the middle of the visible light spectrum.
The latest generation of NVD use a green yellow Phosphor (P43), and gives the operator a much more comfortable viewing experience.
SAFETY BENIFITS
Analysis of US traffic fatalities by the University of Michigan Transport Research Institute (UMTRI) has shown :
The risk of a pedestrian fatality is around four times higher at night than during daylight hours.
Higher alcohol consumption, increased fatigue, greater exposure to animals on the road and reduced range of vision are some of the important factors owing to the same.
One reason that driving at night is so difficult is that high-beam headlights can rarely be used owing to the frequent presence of oncoming traffic.
Older drivers, who typically have shorter detection distances of just 30–50 m for dark objects when driving with low-beams and facing oncoming vehicles.
CONCLUSION
It has become the need of the hour to have these kinds
of hybrid safety systems on the latest automobiles that
could save the lives of many. Many such ideas are yet to
come and it is the duty of young budding engineers to
think innovatively and work upon developing such
techniques one of which being the night vision sensors
used in cars and other automobiles that are proving to be
a great success in the west and this should be
implemented immediately on the Indian terrain and
reduce the catastrophic incidents that occur on the roads
especially during the night times.