Lidar Flashcards
What does LIDAR stand for
Light Detection and Ranging
What does LASER stand for
Light Amplification by Stimulated Emission of Radiation
Frequency of LIDAR
330 THz, or 330,000,000,000,000Hz
Speed Accuaracy
+ or - 1km/h
Range Accuaracy
+ or - 15cm over 2438 metres
Speed Range
8km/h to 320km/h
Beam Width
10cm over 100 metres
Pulses of light emitted every second
200
Time to calculate and display speed
1/3 of a second
Speed of light
300,000,000 m/s
What does default setting provide?
- Speed Mode
- Both directions
- Maximum range 2438 metres
- 600 metre range as used by NSWPF
How to record event
To record speed check as an event, push the ‘check’ button
Poor Weather Function
- 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
When will LIDAR enter sleep mode
After approximately 2 minutes without activity
When will LIDAR automatically turn off?
After approximately 15 minutes
Three critical functions of Heads Up Display
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
Where do you aim the reticle
1) At the centre number plate area
2) Headlight of a motorcycle
3) Greater distance can be obtained on receding targets
What appears on LIDAR in event of a test failure
- Error message is displayed in rear panel
- “HELP” appears in the HUD
What action do you take in event of test failure
- Turn unit off and on again
- If the message persists, note the message and return to Radar Engineering Unit
How to complete a HUD Alignment Check
- 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
How to complete a Distance Accuracy Check
- 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
COSINE Angle
- The greater the angle (of target from LIDAR) the lower the recorded speed
- Always in motorists favour
- Apply a 10:1 ratio to overcome
When does Sweep Effect occur
- 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
How can sweep effect be eliminated?
Having a complete tracking history
7 steps of a Lidar speed check
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
Operating temperatures of LIDAR
Minus 30 Degrees Celsius to 60 Degrees Celsius
Where is the LIDAR stored when not in use
Store and transport in protective case
LIDAR “don’ts”
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
