LIDAR Flashcards
Care of LIDAR
- Protect optical lens from contact with any other object.
- Only clean the optical lens with optical cleaner.
- Store & transport in protective case.
6 “Don’t’s” (know 4)
1- Don’t aim the laser at the sun.
2- Don’t clean it the with your shirt or hanky.
3- Don’t operate with a large cosine.
4- Don’t operate without proper line of sight.
5- Don’t pan or sweep across target.
6- Don’t operate through any fixed or closed windows.
What does LASER stand for?
L- Light
A- Amplification by
S- Stimulated
E- Emission of
R- Radiation.
Test Failure?
- Error message displayed on the rear panel.
- “help” displayed in the HUD.
- Restart device.
- Return to REU if error still appears.
Aiming the reticle?
- Aim at the centre of the number plate or headlight of motorcycle.
- Reading can be obtained at a greater range if vehicle is receding.
What 3 functions does the HUD perform?
1- Provide an aiming reticle.
2- Range of target
3- Tracking alert marked “X” after a 3 second continuous tone.
LIDAR will sleep in?
2 Minutes
LIDAR will shut down in?
15 Minutes
Poor Weather Mode
- Activated by pressing “poor weather” button for 3 seconds.
- Improves device sensitivity.
- Minimum range is set to 60m.
- For fog, dust, snow and rain.
How is the sweep effect negated?
It is eliminated by having a complete tracking history.
How to record a speed as an event?
Press and hold the “Tick” button.
Hud alignment check?
1- Place pro laser in range mode.
2 - Pull trigger and listen for beep.
3 - Move unit left to right across pole, tone should be heard when reticle on pole.
4 - Rotate 90 degrees and perform step 3 again.
Frequency Used?
330 Thz
Operating temprature
-30 degrees to +60 degrees
What does LIDAR mean?
L- Light.
D- Detection.
A- And.
R- Ranging.
What are the 7 steps for a valid speed check.
(Tracking History)
(Know verbatim)
1- Visual observation of the target vehicle & traffic.
2- Visual estimation of the target’s speed.
3- Place aiming reticle on the target vehicle.
4- Obtain a solid tone & speed reading.
5- Verify the estimation of speed & speed reading agree (within limits).
6- Minimum 3 second check.
7- Continue to track visually.
Speed detection range?
8km/h – 320km/h.
Speed Accuracy?
+ or – 1km/h.
How is the speed detected?
- Time of flight method.
- Each light pulse is timed from being emitted to reaching a target.
- 200 pulse of light emitted every second.
- 70 pulses must return before a speed is displayed. (0.3 seconds)
What is the default setting?
- Speed mode.
- 2438m range (600m for NSW police)
- Both directions.
What is the tolerance when performing start up procedure?
+ or – 20cm.
Cosine
- 10:1 ratio
- Greater the angle, the lower the recorded speed
- Always in favour of the motorist
Beam width?
10cm width per 100m
Frequency
330THZ
What does LIDAR stand for?
LI - Light
D - Detection
A - And
R - Ranging
Wave Length
904NM (nanometers)
Range Accuracy
+ / - 15cm over 2438m
Influences
- Weather
- Windscreen
- Movement
- Laser jammers
- Reflection influence
- Sweep effect
- Night operation and headlights
- Cosine effect
Acquisition Time
1/3 of a second
How is speed detected?
- Using the time of flight
- Each light pulse is timed from being emitted to reaching a target
- 200 pulses of light every second
- 70 pulses must return for a speed reading (0.3 seconds)
Symbol of direction of target
DOWN - approaching
UP - receding
What to do if you drop LIDAR?
- Conduct a test sequence and return to station and carry out HUD alignment and Distance accuracy check
- If works correctly continue using
- If fails, return to REU
Where should the distance accuracy check be recorded?
Field / LIDAR Book at station
How to perform distance accuracy check?
- Use surveyed markings on ground at back of station, must be within + / - 20cm.
- Check range at 25m mark, note distance displayed in the HUD
- Check range at 50m mark, note distance displayed in the HUD.
Operator to take into account when operating LIDAR
- Cosine Angle
- Clear line of sight
- Weather Conditions
- Movement of the unit
