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Visible LASER is problematic in that the beam can be seen when refracted/reflected to the eye or a sensor. IR LASER is somewhat more effective, but is also more expensive.
LASER based perimeters are themselves difficult in that they yield a huge number of false positives. So any area one needed to protect with a system as pricey and difficult as a LASER based perimeter would need support from other security systems, including a manned response team to check out all those hits.
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How To Build a Laser Security System?
laser light build
What type of laser used in cd and dvd players?
Generally, it's an infrared laser, although some use a visible light laser but those are generally just for playback purposes. The infrared is mainly used for burning disks as well.
Are infrared pens and laser pens the same?
No they are not. The difference is the light. Laser pens will have the red shining light while the infrared pens won't have any visible light. The only way you will be able to tell if it's working (the infrared pen) is you have to test it against either a wiimote or camera lens for more information visit http://infraredpens.com/
How effective is an infrared security camera?
Infrared security cameras are very effective. They have the capability to capture pictures in little to no light. They are rated at 82 effective feet.
What is the difference between a laser pointer and an infrared laser pointer?
An infrared pointer uses light that is mainly in the infrared spectrum, and so is mostly invisible to humans. A laser pointer in general refers to any device using a beam of light to mark an object. Both use the same basic technology. The only difference is the wave length. IR lasers are outside of the visual spectrum where as standard laser pointers are within the visual spectrum.
What does the military abbreviation peq stand for?
Not sure what the letters actually stand for but PEQ is a portable laser/laser combination. PAQ is an infrared illuminator or aiming light.
When a laser thermometer says it has a range of 0 to 1000 F can it still display the temperature of a 3000 degree object but just not accuratly?
No! There is no such thing as a Laser thermometer. You mean an infrared thermometer with a laser pointer. All point and shoot thermometers are infrared based. Since infrared light is in the spectrum, it does not require excitation or amplification therefore it is not a laser. Laser is the acronym for Light Amplification by the Stimulated Emission of Radiation. The Thermometer it self has a specific Micro chip that has a pre set temperature range. The display may show you a number above 1000 but it is false. The Rayethon corporation developed one of the first affordable portable infrared thermometers.
Can your eyes see infrared?
The naked eye cannot see infrared light. The naked eye can see red. Both red light and infrared light are two different colors. Infrared light can't be seen, because it's wavelength is too long for the naker d human eye to detect. Though the above response is correct in most instances, there are conditions where the eye can indeed see near-infrared light. Two examples will be provided - both involving laser light. An Alexandrite laser is tunable from 740 to 780 nm. When laser light is emitted from this laser, it is clearly visible. This is in part due to the high intensity of the light combined with the fact that the red cones of the eye have an extended response tail that still sensitivity beyond the visible spectrum from 400 to 600 nm. Another more intriguing case is that of a laser rangefinder emitting at 1064 nm (much further out in the near-infrared spectrum). For many years, military LRFs used Nd:YAG lasers for rangefinding to targets up to several miles. Reports from soldiers stated they could see this laser light. Experiments were conducted and found to verify this. When the eye is dark adapted (night viewing), the rods become the primary sensor. It's why you can't see color in dark conditions. Under these scoptopic conditions, the eye is much more sensitive to light in general. So the eye under certain conditions can indeed see infrared.
How are laser rays used on burning process of CD and DVD?
CD-R's use a sort of fluid in them that reflect light but don't after it is burned. A computer uses a code of 1's and 0's so the laser light from a CD ROM is bounced of by the reflection and is counted as a 1 and when it is not bounced back is a 0, so the laser burns the fluid.
Is a laser beam made out of light?
Yes, it is made out of light. LASER is an acronym for Light Amplification by Stimulated Emission of Radiation. Laser light is coherent--the waves are all aligned, and the beams are generally tightly collimated, with very little attenuation of the beam over great distances.
What are infrared rays?
Infrared rays are electromagnetic waves with a wavelength longer than the wavelength of visible 'red' light [or you could say they have a lower frequency than red light]. Infrared 'light' is used in TV remote controls to transmit information to an infrared receiver on the TV, and also in security systems to create an invisible 'light beam' that when broken, will send a signal back to the system.
What is a infrared beam?
An infrared beam is often used on a security alarm. When the beam is broken, an alarm sounds. The beam is invisible because infrared is electromagnetic radiation that has longer wavelengths than the ones with visible light.
