42 | 50
© 2021 LeddarTech Inc.
Since the setup uses a horizontal polarizer at the output of the steered beam, the objective of this calibration
will be to find the voltage that minimizes the power output of the beam. By minimizing the horizontal
component, the vertical component is thus simultaneously maximized. To do so, an algorithm very similar to
the one used for the calibration of the first 7 cells is used. Instead of finding a maximum, the algorithm is set
up to find a minimum and does so by firstly incrementing in 0.25 V steps then decreases this step down to
0.02 V. The infrared camera is used to evaluate the illumination of the spot.
The voltage of the 8
th
cell span can vary, but typically the low voltage (
3𝜆
4
) should range from 1 V to 5 V
while the moderate voltage (
𝜆
4
) should be in the range of 5 V to 14 V. If calibrated voltages are outside of
the range above, further investigations may be required.
11.2. Optical Efficiency
Fig. 26
: LeddarTech’s current optical setup for optical efficiency (conceptual view)
Table 27: Optical setup legend, optical efficiency
#
Tool
Model Used
A
Optical table
Thorlabs
B
Mirrors
Thorlabs PF10-03-P01
C
Collimating lens
Thorlabs C230TMD-B
D
Light source
Thorlabs M9-915-0300, 915 nm, 300 mW
E
Screen
Simple black wall
F
Light source control Thorlabs LDM90 + T LDC205C
G
Power meter
Thorlabs PM100D
H
DBSD
LeddarSteer
I
Vertical polarizer
Thorlabs LPVIS050-MP2
J
DBSD controller
LeddarSteer Evaluation Board
