sensice ice detectors dr ulf elman, president sensice 070320
TRANSCRIPT
Sensice ice detectors
Dr Ulf Elman, President
Sensice 070320
Traffic accidents in Sweden 1995-1999:
Sensice 070320
•37828 at snowy or icy road surface conditions, of these did
•15589 occur during black ice conditions, and in addition did
•572 accidents related to
aquaplaning occur
Fixed applications
Roadside mounting
Sensice 070320
Fixed applications
Icing alert at building entrances
Sensice 070320
Fixed applications
Ice detection at airports
Sensice 070320
Fixed applications
Ice sheet or icicle buildup at sensitive spots
Sensice 070320
In-car mounting
Detection range: 50m
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In-car mounting
Continuous detection with a response time
of 0.1 s
Sensice 070320
In-car mountingInsensitive to ambient light and works in darkness
Sensice 070320
In-car mountingSeveral interface options:
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•Display integrated with detector
•Separate display unit
•FlexRay, CAN-bus, Ethernet, USB, RS232 or RS485
In-car mounting
Placing the detector head:
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•Integrated display and detector head behind windscreen
•Separate detector head at front of vehicle
General properties
Uses infrared spectroscopy
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General properties
Principles of spectroscopy
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•Ice transparent to visible light
•Ice is reflective (metal like) in the MIR range
•Ice is distinctly ”coloured” in the NIR range
General properties
Four state system
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1. Dry
2. Wet
3. Ice
4. Mix of ice and water
General properties
Six state system
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2. Wet
1. Dry
3. Clear ice
4. Snow
5. Sleet
6. Wet clear ice
General properties
Six state system
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• Ice and water ratio
• Ice and water thickness
• Accepts larger layer thickness range
Failure rate
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•Unable to separate water/ice on windscreen or in the air from water/ice on road surface
•Intrinsic failure rate
•External error sources
•Staring system, detection area may leave road surface•Objects in line of sight, such as wipers or other cars, may interfer with detection
Synergy effects
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•Does not interfer with infrared night vision system and may share some optics with it
•May beneficially use rain sensor data
•If mounted behind windscreen it may use wiper control system data
•Cooperates advantageously with adaptive headlights
Decreasing size and weight
Sensice 070320
•Present volume 2.8 l, weight 2.7 kg
•Next version volume 1.0 l, weight 0.5 kg
•Ultimate size limit set by aperture sizes, may be made far smaller and much more lightweight
Sensice’s unique detectors
•Excessively expensive systems for ice
detection have been around for decades
Sensice 070320
•Sensice’s ice detectors are unique in that they are produceable at cost levels
acceptable to consumers
Company facts, Sensice
Sensice 070320
•Founded 2004
•First order september 2005 (Volvo, LuTH)
•Two patents granted, further patents pending
