Laser
device with warning function are widespread used because of its advantage. There
are many scenes like these in the 007 system movies: make a beam of light fill
up the monitoring area, when someone enter the area, he will block the light
and then the laser alarm device will send out a particular signal which will
attract the attention of guardians in order to take appropriate measures.
Compared
with the device with visible laser beam, semiconductor laser unit with many
advantages which as listed:
It launch
the infrared light which is invisible for human eyes.
Launch
in pulse type, can be encoded and make the false signal failure.
With
high efficiency, can produce high power and that will prolong the useful time
and distance.
Good
directionality. It is able to reflect by prism. This can make the laser beam as
an invisible wall around a certain area, and block the inward or outward.
When
the light are kept out, the laser warning device will ring. The experienced user can judge
from a variety of different information of the target category.
This
kind of device can be applied to the airport, warehouses, and other secret
facilities in barracks, to help the guards to work.
No comments:
Post a Comment