Lidar

Question 1

What does LIDAR stand for

Answer 1

Light Detection and Ranging

Question 2

What does LASER stand for

Answer 2

Light Amplification by Stimulated Emission of Radiation

Question 3

Frequency of LIDAR

Answer 3

330 THz, or 330,000,000,000,000Hz

Question 4

Speed Accuaracy

Answer 4

+ or - 1km/h

Question 5

Range Accuaracy

Answer 5

+ or - 15cm over 2438 metres

Question 6

Speed Range

Answer 6

8km/h to 320km/h

Question 7

Beam Width

Answer 7

10cm over 100 metres

Question 8

Pulses of light emitted every second

Answer 8

200

Question 9

Time to calculate and display speed

Answer 9

1/3 of a second

Question 10

Speed of light

Answer 10

300,000,000 m/s

Question 11

What does default setting provide?

Answer 11

• Speed Mode
• Both directions
• Maximum range 2438 metres
• 600 metre range as used by NSWPF

Question 12

How to record event

Answer 12

To record speed check as an event, push the ‘check’ button

Question 13

Poor Weather Function

Answer 13

• Improves sensitivity in adverse weather conditions
• Fog, rain, snow, heavy dust impacts effectiveness
• Sets minimum range to 60 metres
• No speed or range readings possible within 60 metres
• Pushing and holding the ‘Poor Weather’ button for 3 seconds will activate Poor Weather Mode

Question 14

When will LIDAR enter sleep mode

Answer 14

After approximately 2 minutes without activity

Question 15

When will LIDAR automatically turn off?

Answer 15

After approximately 15 minutes

Question 16

Three critical functions of Heads Up Display

Answer 16

1) Provides aiming reticle the operator uses to aim at the desired target

2) Displays speed or range of the target as operator continues to observe target creating tracking history

3) Displays the tracking alert marker after 3 seconds of continuous tone. “*” displayed

Question 17

Where do you aim the reticle

Answer 17

1) At the centre number plate area

2) Headlight of a motorcycle

3) Greater distance can be obtained on receding targets

Question 18

What appears on LIDAR in event of a test failure

Answer 18

• Error message is displayed in rear panel
• “HELP” appears in the HUD

Question 19

What action do you take in event of test failure

Answer 19

• Turn unit off and on again
• If the message persists, note the message and return to Radar Engineering Unit

Question 20

How to complete a HUD Alignment Check

Answer 20

• Place LiDAR in ‘range’ mode
• Verify tone is audible
• Pull trigger
• Using a pole or a sign with a clear background, move the unit left and right
• As HUD reticle is moved onto target, a clear tone should be heard
• When reticle is not on target, no sound and no range displayed
• Rotate unit 90 degrees and repeat

Question 21

How to complete a Distance Accuracy Check

Answer 21

• Place Pro-Laser in ‘range’ mode
• At pre-measured distances (25m & 50m) fire laser and record readings in Field Book
• Readings should be +/- 0.2m of marking point

Question 22

COSINE Angle

Answer 22

• The greater the angle (of target from LIDAR) the lower the recorded speed
• Always in motorists favour
• Apply a 10:1 ratio to overcome

Question 23

When does Sweep Effect occur

Answer 23

• Sweep effect may occur when operators target side of target vehicle or bonnet of target vehicle
• Occurs at distances in excess of 150m
• Effect can add or subtract speed
• Can be eliminated by having a complete tracking history

Question 24

How can sweep effect be eliminated?

Answer 24

Having a complete tracking history

Question 25

7 steps of a Lidar speed check

Answer 25

1) Visual observation of target vehicle and traffic
2) Visual estimation of target speed
3) Place aiming reticle on target vehicle
4) Obtain solid tone and speed reading
5) Verify estimate of speed and speed reading agree (within limits)
6) Minimum of 3 second check
7) Continue to track visually

Question 26

Operating temperatures of LIDAR

Answer 26

Minus 30 Degrees Celsius to 60 Degrees Celsius

Question 27

Where is the LIDAR stored when not in use

Answer 27

Store and transport in protective case

Question 28

LIDAR “don’ts”

Answer 28

1) Don’t aim laser at the sun
2) Don’t clean the lens with shirt or hanky
3) Don’t pan or sweep across target
4) Don’t operate with a large cosine
5) Don’t operate without clear line of sight
6) Don’t operate LIDAR through fixed or closed windows