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LIDAR > LIDAR > Flashcards

LIDAR Flashcards

1
Q

Care of LIDAR

A
  • Protect optical lens from contact with any other object.
  • Only clean the optical lens with optical cleaner.
  • Store & transport in protective case.
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2
Q

6 “Don’t’s” (know 4)

A

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.

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3
Q

What does LASER stand for?

A

L- Light
A- Amplification by
S- Stimulated
E- Emission of
R- Radiation.

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4
Q

Test Failure?

A
  • Error message displayed on the rear panel.
  • “help” displayed in the HUD.

  • Restart device.
  • Return to REU if error still appears.
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5
Q

Aiming the reticle?


A
  • Aim at the centre of the number plate or headlight of motorcycle.
  • Reading can be obtained at a greater range if vehicle is receding.
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6
Q

What 3 functions does the HUD perform?

A

1- Provide an aiming reticle.
2- Range of target
3- Tracking alert marked “X” after a 3 second continuous tone.

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7
Q

LIDAR will sleep in?

A

2 Minutes

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8
Q

LIDAR will shut down in?

A

15 Minutes

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9
Q

Poor Weather Mode

A
  • Activated by pressing “poor weather” button for 3 seconds.
  • Improves device sensitivity.
  • Minimum range is set to 60m.
  • For fog, dust, snow and rain.
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10
Q

How is the sweep effect negated?

A

It is eliminated by having a complete tracking history.

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11
Q

How to record a speed as an event?

A

Press and hold the “Tick” button.

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12
Q

Hud alignment check?

A

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.

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13
Q

Frequency Used?

A

330 Thz

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14
Q

Operating temprature

A

-30 degrees to +60 degrees

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15
Q

What does LIDAR mean?

A

L- Light.
D- Detection.
A- And.
R- Ranging.

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16
Q

What are the 7 steps for a valid speed check.
(Tracking History)
(Know verbatim)

A

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.

17
Q

Speed detection range?

A

8km/h – 320km/h.

18
Q

Speed Accuracy?

A

+ or – 1km/h.

19
Q

How is the speed detected?

A
  • 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)
20
Q

What is the default setting?

A
  • Speed mode.

  • 2438m range (600m for NSW police)
  • Both directions.
21
Q

What is the tolerance when performing start up procedure?

A

+ or – 20cm.

22
Q

Cosine

A
  • 10:1 ratio
  • Greater the angle, the lower the recorded speed
  • Always in favour of the motorist
23
Q

Beam width?

A

10cm width per 100m

24
Q

Frequency

A

330THZ

25
Q

What does LIDAR stand for?

A

LI - Light
D - Detection
A - And
R - Ranging

26
Q

Wave Length

A

904NM (nanometers)

27
Q

Range Accuracy

A

+ / - 15cm over 2438m

28
Q

Influences

A
  • Weather
  • Windscreen
  • Movement
  • Laser jammers
  • Reflection influence
  • Sweep effect
  • Night operation and headlights
  • Cosine effect
29
Q

Acquisition Time

A

1/3 of a second

30
Q

How is speed detected?

A
  1. Using the time of flight
  2. Each light pulse is timed from being emitted to reaching a target
  3. 200 pulses of light every second
  4. 70 pulses must return for a speed reading (0.3 seconds)
31
Q

Symbol of direction of target

A

DOWN - approaching
UP - receding

32
Q

What to do if you drop LIDAR?

A
  • 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
33
Q

Where should the distance accuracy check be recorded?

A

Field / LIDAR Book at station

34
Q

How to perform distance accuracy check?

A
  1. Use surveyed markings on ground at back of station, must be within + / - 20cm.
  2. Check range at 25m mark, note distance displayed in the HUD
  3. Check range at 50m mark, note distance displayed in the HUD.
35
Q

Operator to take into account when operating LIDAR

A
  • Cosine Angle
  • Clear line of sight
  • Weather Conditions
  • Movement of the unit

LIDAR (1 decks)

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