What is a Laser Jammer?

出自Ubuntu 正體中文 Wiki

跳轉到: 導航, 搜尋

LIDAR guns are used by many law enforcement traffic police officers to quickly and easily determine the speed of a vehicle travelling either towards or away from the laser gun. These laser guns function using the "Doppler effect" in a similar way to radar based devices. The laser light pulses are reflected off the vehicle bodywork, headlights and number plate returning to the laser gun in extremely short time periods measured in Nano and Pico seconds. The laser gun firmware logs the time it takes for the laser signal to bounce back and uses this time to calculate the speed of the target vehicle. There are several makes and models of laser gun used in Australia at this time (April 2014)

       LTI Ultralyte 20/20
       Kustom Pro Laser III
       LTI Ultralute 20/20 Compact 125 pps
       LTI TruSpeed
       LTI TruCAM
       LTI Truspeed S (2000pps)
       VITRONIC PoliscanSpeed Tripod/Vehicle mounted laser speed camera

A laser jammer is a device typically used by motorists in an attempt to counteract or confuse the use of invisible light detection and ranging (LIDAR) speed detection devices often used by law enforcement to hand out speeding fines. A LIDAR jammer is a device that operate at blindingly quick speeds to react to incoming laser signals and then return a carefully designed and timed signal that makes the LIDAR gun miscalculate the speed of the vehicle or tricking the laser gun into believe that it isn't aiming at anything at all - just thin air.

A laser jammer is not necessarily illegal for use by motorists in all areas, though some countries and regions have outlawed their use. Western Australia has no specific laws banning the use of LIDAR jammers or radar detectors. New South Wales has laws against the use of laser jammers, however their law allows for other equipment that my accidentally interfere with laser speed detection equipment.

It is interesting to note that the light spectrum that is used for laser speed detection is NOT licensed to the police or anyone in particular. It is a free light spectrum and the frequency and can be used by any manufacturer in their devices. Examples of this light spectrum being used are Parking Assist devices which use LIDAR to detect stationary objects. Because this light spectrum is open to the public to freely use, it is ludicrous that some states have outlawed "inadvertent interference." (www.blinder.com.au/home.html Laser Park Assist)

Also called laser scramblers, a laser jammer sends out a carefully crafted signal that mimics the returning signal of the LIDAR speed gun. Laser jammers with poorly crafted signals, may cause an alert to be generated on the laser speed gun, alerting the police officer that his speed reading is being disrupted. A modern European designed laser jammer should never give off jamming error codes.

LIDAR guns are not prone to "reflection errors" that plague radar guns readings. Hence laser speed readings are replacing radar as the preferred method of obtaining a speed reading. Police Officers prefer the fast operation of laser speed reading devices that can obtain a reading in fractions of a second. A laser jammer sends out a light signal that effectively "tricks" the laser gun, so that it is unable to properly calculate and display a correct speed. While the laser jammer is communicating with the laser gun, it also sends out an audio alert to warn the driver that someone is attempting to gain a speed reading of the vehicle.

Laser Jammers from Blinder even tell drivers the make and model of the laser gun threat through voice alerts. Once the signal is detected and alert sounds, the driver has 3 to 5 seconds to take remedial action, check the speed of the vehicle and if necessary, reduce speed and the switch off the laser jammer. When used by an expert, this "brake and switch off" event can take less that 4 seconds.

The sensors for a laser jammer can be mounted in the grille or bodywork of the vehicle. Although most speed readings are obtained from the front of the vehicle, many drivers also mount sensors to the rear of the vehicle to avoid speeding fines from rear aimed laser guns.

The use of a laser jammer is not necessarily illegal in all areas, though some regions have passed laws to ban the use of such devices. While many countries have laws that forbid the use of radar jammers to disrupt the use of older radar speed detection guns, these laws do not necessarily cover the use of laser jamming devices. In the US, individual states have begun passing laws to ban the use of a laser jammer. This means anyone driving from state to state and using such a jammer should be aware of the legality of using such a device in each state. That being said, the sensor sfor these devices can be very discrete and difficult to notice. Some drivers use "lift kits" that elevate the sensor out of view when the laser jammer is switched off. You can use an old computer DVD player as a cheap Lift Kit with the sensors attached to the slide tray.

Many motorists with high end vehicles are more than happy to fork out the $600+ to necessary to purchase a full Quad sensor system from Blinder Australia. Over time, the accumulated savings from avoided speeding fines, can make the initial outlay look cheap in comparison to demerit points and a lost driver's licence.

If you have any questions, please ask you Blinder representative (blinder.com.au)

Available from www.blinder.com.au/home.html