Product
AD7863
Laser Ground Sensor
Dynamic vehicle measurement series
Speed and position data using laser measurement method
Measurable in clear weather
Features
The Laser Ground Sensor (LGS) consists of 2 Laser Doppler Velocimeters (LDV) and 3 Laser Distance Sensors (LDS). The LDVs measure ground speed along two directions and tire rotation in the lateral direction. The 3 LDSs measure the distance from the ground to identify wheel height change during the drive. Slip angle, camber angle, pitch angle and roll angle are calculated by the DSP (Digital Signal Processor) model based calculation.
- IP65 waterproof
- LDS can be used on sunny days by attaching a filter (Optional)
- Attachable to a standard wheel
- Various combinations with A&D sensors.
- Data is stored in a Micro SD card and can connect to the CAN logger
Principal of operation
Laser Displacement Sensor (LDS) : Displacement and height are measured by laser reflections.
Laser Doppler velocimeter (LDV) : A laser is split in two and the velocity measured at the cross point. This advanced analysis method enables highly accurate measurements. The vehicle’s drive path record is measured by integration calculations.
Application example
Vehicle drive path record: 2 Laser Ground Sensor (LGS) systems are attached to the front and back of the vehicle to measure its drive path as well as its yaw angle. Horizontal velocity and driving distance data are used for this calculation.
Appearance
Data example
Vehicle used : Mini Cooper S
Test pattern : Sweep steering
Sampled wheel : Front left
Measured values : Vx, Vy, Slip angle, Camber angle, Pitch angle and Tire radius
Measurement duration : 15 secs
Vehicle velocity : Up to 40km/h
Specifications
AD7861-01(LDV) and AD7862-01(LDS) specifications
| Item | Specifications | Remarks |
|---|---|---|
| Method | Laser Doppler system | Velocimeter |
| Laser system | Distance sensor | |
| Speed | SpX: Tire rolling speed | |
| SpY: Side speed | ||
| Tire angle | SA: Slip angle (angle formed by velocities in rolling and side directions) | |
| CA: Camber angle (angle around X axis) | ||
| PA: Pitch angle (angle around Y axis) | ||
| Physical tire radius | Tr: distance between tire center and ground | |
| Mileage | DdX: Mileage in rolling direction | Velocity integration |
| DdY: Mileage in side direction | ||
| Speed resolution | 0.2% or 0.006km/h | |
| Ground distance resolution | 50μm | |
| Tire angle resolution | SA: 0.002rad or 0.115deg | Distance between laser sensors |
| CA: 3.57E-4rad or 0.0205deg | Rolling dir.: 240mm | |
| PA: 2.08E-4rad or 0.0119deg | Side dir.: 140mm | |
| Speed measurement range | ±144km/h or -4km/h to 318km/h | |
| Ground distance measurement range | Focal length ±50mm | |
| Mounting | Dedicated mounting bracket | |
| Weight | 3.3kg | Including mounting bracket |
| Reference value |
AD7893 - LGS
| Item | Specifications | Remarks |
|---|---|---|
| Calculation / Measurement | ||
| Ground speed calculation | Digital model calculation | |
| Calculation rate | 1kHz | |
| Measurement items | Rolling speed, side speed, slip angle, camber angle, pitch angle, tire radius, rolling distance and side direction distance | |
| Data interpolation function | ON/OFF selectable | |
| Liquid Crystal Display | ||
| Display items | Numerical display of the above measurements | |
| Data Output | ||
| Output device | CAN | |
| Data output frequency | Selectable from 1/2/5/10/20/50/100/200/500/1k (Hz) | |
| General | ||
| Size | Width 97mm x Height 97mm x Depth 208mm | DC 12V AC power adaptor |
| Width 110mm x Height 115mm x Depth 310mm | ||
| Power supply | AC 100 to 240V | |
| DC 12V ±10% | ||
| Operating temperature | 5 to 40℃ | |
| Operating humidity | 5 to 90%RH (no condensation) | |
| Weight (kg) | 1.2kg | |
