Optical sensor
Transcript of Optical sensor
By ABDUL LATHEEF M AROLL NO : 1S7 EI
CONTENT INTRODUCTION OPTICAL SENSOR
PARAMETERS MEASUREMENT PLOTS OF LED MOUNTING OF SENSOR TILT ANGLE HOW TO MEASURE TILT ANGLE? SIGNAL PROCESSING RESULTS ON RACETRACKS
ADVANTAGES DRAWBACKS APPLICATION CONCLUSION REFERENCE
INTRODUCTION
New technology in Modern vehicles to enhance safety
Anti Lock Braking System (ABS)
Tilt angle (Roll angle) – crucial variable to determine
motorcycle behavior
Represents the amount of inclination to ensure the force balance
The technology uses a sensor to measure tilt angle at
real-time
Tilt angle is a by product of GPS but does not provide at
real-time
Optical sensors are suitable as technologically as well as
economically for racing applications
OPTICAL SENSOR
PARAMETERS
Measurement range : 15-100cms
Output voltage : 0.5-2.5 volts
Emitters : LED, LASER
Average output power : 0.1mW
MEASUREMENT PLOTS OF LED
MOUNTING OF SENSORS
TILT ANGLE
Definition : Angle represents the amount of inclination that
the bike needs in order to ensure the
force balance during the curved trajectory
and hence to reach a steady state cornering
condition .
HOW TO MEASURE TILT ANGLE?
Tilt angle ( ϕ )= arctan((d1 − d2)/L)
d1 = Ho + L/2 tan (ϕ)
d2 = Ho - L/2 tan (ϕ)
Where, L :- Lateral displacement b/w the 2 distance sensors Ho :- Distance b/w each sensor and the ground when
the bike axis is vertical d1&d2 :- Distance b/w the marked points and the
ground
SIGNAL PROCESSING
RESULTS ON RACETRACK
ADVANTAGES Small size Low cost Low weight <10 gm Variable range depending on mounting condition Accurate measurement
DRAWBACKS LED emitter suffers too much from solar
interference LED not adequate for real-time measurements at
high motorbike speeds Roughness of roads make noise interference
APPLICATION
Tilt angle measurement in sports bikes
CONCLUSION Optical sensors are used to measure tilt angle LED and LASER emitters are used LASER is used more than LED Sensors must be mounted at a reliable distance
from the ground
REFERENCES IEEE WIKIPEDIA
Thank You