Information Communication Systems / Intelligent Transport
High-speed IR LEDs of 840nm such as L840-01KS-B and L840-04KS-B, are widely
used in Japan for real time communication between light pole
beacons and cars. They were developed in collaboration
with KOITO INDUSTRIES
LTD. Epitex is a major supplier for this application in Japan. Such IR communications have numerous advantages over FM
radio and microwaves.
power of more than 17mW at IF= 50mA
life of more than 15 years(10^5 hours) when used in the
field. Degradation data is available
|| L840-01KS-B with a half viewing angle of ±10 degrees is focused
around at the center of light spot and L840-04KS-B with a half
viewing angle of ±20 degrees is focused on the fringe of light
spot. Both of them are set up together.
are available on request
Toll Collection / Intelligent Transport
traffic congestion before a highway toll gate. Toll is charged
through mm-wave of 8.5GHz. I addition, light source of high
power 850nm LED made by Epitex is used to covertly
photograph a license plate for identification.
Infrared cameras and
for Image Analysis
Analysis system contains a LED illuminator and its power source,
camera and monitoring TV or printer. A range of wavelength is
covered widely from 430nm to Near-Infrared 1.45um depending
on the particular image analysis system.
camera disguised as a lamp is used to prevent crime. Our experience so
far has shown that the L810 series
is the best to fit to CCD camera from the view point of the
sensitivity. However, such a camera is easily noticeable, therefore, emission wavelength of LED is preferably
shifted to near 940nm.
Optical Data Communications
|lrDA and other
(Infrared Data Association) is a worldwide organization. LEDs used in this system are required, firstly, to
have a high
speed response and secondly, high power. The LN850-xxUS
series has been designed and developed to meet these demands.
Here S stands for speed.
system is a module which emits and receives signals optically without
wiring. The Infrared module proposed by LTEL in Japan is one
method of wireless IR data communication with PCs based on the light scattering method.
type IR LEDs with its wide viewing half angle of ±60° can
widely diffuse IR radiation enabling wireless data
transmission over relatively long distances, within a room such
as a school PC class, for example, a building or between
buildings. Such IR LAN is a good alternative to
wireless radio method.
Fiber Optic Sensor and
is intended for use in fibre optics. It has a flat top
designed to be easily handled with reduced loss when the
LED is connected to the fibre cable.
for optical sensor
wavelengths are designed to focus on the objects such as
blood or autron of a human to monitor one's health
condition. Epitex has been involved in supplying
multi-chip devices with wide wavelength range from 430 to
devices of 1300 and 1450nm are manufactured. A pair of IR and PD is
generally installed in the various kinds of equipment used to check the bill,
position sensor in
film-developing machine and measure water content, for example.