ProLaser 4 Lidar Flashcards
What does LASER stand for?
Light amplification by stimulated emission of radiation
What does LIDAR stand for?
Light detection and ranging
What does the ProLaser 4 Lidar use?
- Monochromatic light
- Gallium arsenide solid state laser diode
What are the three functions of the HUD?
- Provides the aiming reticle used to aim at the desired target
- Provides current speed of target as observed, creating tracking history
- Displays tracking alert after 3 seconds of continuous solid tone (X indicator on right side)
When does the ProLaser 4 Lidar enter sleep mode and Shut down?
Sleep mode after 2 minutes of being idle.
Shuts down after 15 minutes of being idle.
What is the voltage of the ProLaser 4 Lidar?
4.3 to 7 volts
What is the operational temperature of the ProLaser 4 Lidar?
-30 degress to +60 degrees Celsius
What is the tracking speed range of the ProLaser 4 Lidar?
8 km/h - 320 km/h
What is the accuracy tolerance of the ProLaser 4 Lidar?
plus or minus 1 km/h
What is the range of the ProLaser 4 Lidar?
3 to 2438 metres
Operational range is 600 metres
What is the beam width of the ProLaser 4 Lidar?
10 centimetres per 100 metres of distance
What is the ProLaser 4 Lidar frequency?
330 TeraHertz (THz)
What is time of flight?
A pulse of light is fired from the device towards a target commencing the timer. The pulse of light is reflected back towards the laser and the pulse of light is received which stops the timer.
What four things should be considered when operating the Lidar?
- Cosine angle 10:1
- Clear line of sight
- Weather conditions
- Movement of the unit
List potential influences on the Lidar
- Cosine effect
- Sweet effect (occur in excess of 150m)
- Reflection issues
- Night operation and headlights
- Laser jammers
- Weather
- Target distances
- Multiple reflections
How is the Poor Weather feature activated on the ProLaser 4 Lidar?
In speed range mode, hold the poor weather button for 3 seconds OR In menu mode, push the poor weather button.
No speed readings will occur within 60 metres. Improves sensitivity in adverse weather i.e. rain, fog and snow.
What happens when RFI is detected by the ProLaser 4 Lidar?
RFI will display in the rear window of the unit
What is the range accuracy of the Lidar?
15cm over 2438 metres
What is the wavelength of the Lidar?
904NM
How is speed detected?
- Using the time of flight method
- Each light pulse is timed from being emitted to reaching a target
- 200 pulses of light every second
- 70 pulses must return for speed reading (acquisition time of about 0.3 seconds)
When and how may the Sweep Effect occur?
- May occur in excess of 150 metres, when the operator changes the aiming point, such as sweeping the laser along the side and/or bonnet of the target vehicle.
- This giving the illusion of a greater distance covered during the data collection cycle.
Can be eliminated by a complete tracking history.
What changes during speed enforcement at night?
- Speed estimations are at closer range
- Range can be affected by halogen lights.
What are the steps to perform a distance accuracy check?
- Use the per-measured ground markings made by a surveyor.
- Check the range at the 25 metre mark and note the distance displayed in the HUD.
- Check the range at the 50 metre mark and note the distance displayed in the HUD.
20cm tolerance either side of the specified range check (e.g. 24.8m - 25.2m and 49.8m - 50.2m)
What occurs when the Lidar has an internal test failure?
The internal test failure error message is displayed on the rear of the Lidar and Help appears in the Heads Up Display.
Turn the device off and on and replace batteries. If the error persists return to REU.
Six things you Don’t do with the Lidar
- Don’t aim the laser at the sun.
- Don’t clean the lens with your shirt or hanky.
- 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 the vehicle.
