Lidar

Question 1

Laser stands for ?

Answer 1

Light
Amplification by
Stimulated
Emission of
Radiation

Question 2

Frequency used by Laser ?

Answer 2

330 THz

Question 3

What is the speed of laser light ?

Answer 3

300,000 kilometres per second

Question 4

Laser light can be ?

Answer 4

Reflected

Refracted

Absorbed

Question 5

What is the Pro Laser 4 (Lidar) beam width and height at 305m ?

Answer 5

Approximately 0.3m wide and 1 m high

Question 6

Requirements for a valid speed check with the lidar ?

Answer 6

1 - Visual observation of target and traffic
2 - estimation of targets speed
3 - place aiming reticle on target vehicle
4 - obtain solid tone and speed reading
5 - verify reading and estimate are correct
6 - minimum of 3 second check
7 - continue to track target

Question 7

Pro laser 4 operating voltage ?

Answer 7

4.3 to 7.0 volts DC

Question 8

Lidar speed range ?

Answer 8

8 to 320 km/h

Question 9

Accuracy of Lidar ?

Answer 9

Plus and minus 1 km/h

Question 10

Lidar Minimum and maximum instrument range ?

Answer 10

3m to 2438m

Question 11

Maximum target range ?

Answer 11

600m

Question 12

Lidar Acquisition time ?

Answer 12

0.3 seconds

Question 13

How to complete HUD (heads up display) alignment check ?

Answer 13

1- ensure you are in range mode
2 - aim at a pole or small sign with a clear background
3 - verify the volume is audible
4 - slowly move the Lidar from left to right and back. When the HUD reticle is off the target no tone should be heard and the target display should be blank
5 - as the HUD reticle is slowly moved onto the target a aiming tone should be heard until the aiming reticle is no longer on the target. A range distance should also be present
6 - roster the Lidar 90 degrees and retest. This will ensure the beans in both vertically and horizontally aligned with the aiming reticle

Question 14

What distance are the accuracy check completed at ?

Answer 14

25m and 50m
*must be within plus or minus 0.2m

Question 15

Factors to be taken into account when operating the Lidar ?

Answer 15

1 - cosine angle
2 - clear line of sight
3 - weather conditions
4 - movement of the unit

Question 16

Cosine ration of Lidar ?

Answer 16

10:1

Question 17

Who’s favour is the cosine effect in ?

Answer 17

Always in the drivers favour

Question 18

Why is clear line of sight important?

Answer 18

Having a clear line of sight is mandatory. Pro laser 4 takes over 200 readings per second. If there are any objects between the Lidar and and target then large variation in distance returns will cause the computer to disregard all data and no speed readings will be displayed.

Question 19

What effect does weather conditions have on Lidar ?

Answer 19

Weather conditions play a major role in the maximum target acquisition distance. Fog, snow, dust can effect the range at which a target can be detected.

Question 20

Potential influences for Lidar

Answer 20

• cosine effect
• sweeping effect
• reflection influences
• night operation and headlight
• laser jammers
• weather
• targeting distance
• multiple reflections

Question 21

Several don’t for the pro laser 4

Answer 21

• don’t aim the laser at the sun
• don’t clean the lens with your shirt
• don’t pan or sweep the laser across the target
• don’t operate with a large cosine angle
• don’t operate without a clear line of sight
• don’t operate through any closed or fixed windows of vehicles