Bedienungsanleitung Snooper 4Zero (Seite 10 von 15) (Englisch)

619652

Zoom out

Zoom in

Vorherige Seite

1/15

Nächste Seite

UK • 10

Return to contents

How Laser works

LASER stands for Light Ampliﬁcation by Stimulated Emission of Radiation

The laser speed gun uses a method that relies on the reﬂection time of light. You have probably experienced the reﬂection time of

sound waves in the form of an echo. For example, if you shout down a well or across a canyon, the sound takes a noticeable amount

of time to reach the bottom of the well and travel back to your ear. Sound travels at approximately 1,000 feet (300 meters) per

second, so a deep well or a wide canyon creates a very apparent round-trip time for the sound.

A laser speed gun measures the round-trip time for light to reach a car and reﬂect back. Light from a laser speed gun moves a lot

faster than sound --about 984,000,000 feet per second (300,000,000 meters) or roughly 1 foot (30 cm) per nanosecond. A laser speed

gun shoots a very short burst of infrared laser light and then waits for it to reﬂect oﬀ the vehicle. The gun counts the number of

nanoseconds it takes for the round trip, and by dividing by 2 it can calculate the distance to the car. If the gun takes 1,000 samples

per second, it can compare the change in distance between samples and calculate the speed of the car. By taking several hundred

samples over the course of a third of a second or so, the accuracy can be very high.

The advantage of a laser speed gun is that the size of the “cone” of light that the gun emits is very small, even at a range like 1,000 feet

(300 meters). The cone at this distance might be 3 feet (1 meter) in diameter. This allows the gun to target a speciﬁc vehicle. A laser

speed gun is also very accurate. The oﬃcer has to aim the laser speed gun at a speciﬁc target therefore the oﬃcer will only target

your vehicle if the oﬃcer deems that you are speeding.

How Does Police Laser (LIDAR) Work?

LIDAR is an acronym for Light Distance And Ranging. A LIDAR gun emits a highly focused beam of invisible light, in the near

infrared region of light that is centered at 904nm of wavelength and is only about 22 inches (56cm) in diameter at 1000 feet (300m).

Unlike RADAR which directly determines a vehicle’s speed by measuring its Doppler shift, LIDAR calculates speed by observing the

changing amount of time is takes to “see” reﬂected pulses of light over a discreet amount of time.

Radar Alerts

The 4ZERO has been designed to detect a number of diﬀerent radar bands including K, Ka, Ku and X band. When the unit detects one

of these three frequencies the display will show the radar band type plus display the signal strength. As you drive closer to the signal

the unit will beep faster and the display will indicate that you are getting closer by displaying a series of signal strength blocks.

Missbrauch melden von Frage und/oder Antwort

Libble nimmt den Missbrauch seiner Dienste sehr ernst. Wir setzen uns dafür ein, derartige Missbrauchsfälle gemäß den Gesetzen Ihres Heimatlandes zu behandeln. Wenn Sie eine Meldung übermitteln, überprüfen wir Ihre Informationen und ergreifen entsprechende Maßnahmen. Wir melden uns nur dann wieder bei Ihnen, wenn wir weitere Einzelheiten wissen müssen oder weitere Informationen für Sie haben.

Snooper 4Zero Seite 10

Brauchen Sie Hilfe? Stellen Sie Ihre Frage.

Missbrauch melden von Frage und/oder Antwort

Art des Missbrauchs:

Forenregeln

Neu registrieren

Das Handbuch wird per E-Mail gesendet. Überprüfen Sie ihre E-Mail.

Ihre Frage wurde zu diesem Forum hinzugefügt

Info