Appendix A: Optical; How To Read The Optical Charts - RayTek 3i Operator's Manual

APPENDIX A:

HOW TO READ THE OPTICAL CHARTS

The optical charts indicate the nominal target spot diameter at various distances from
the sensing head. Information on the top line of each chart shows the different spot
diameters at the distances from the sensor given on the bottom line (see Figure A-1).
All measurements are in millimeters or meters and inches.
Target spot size
at focus point
Model
Type
LTCL2
LTCL3
IR Spot Diameter at Lens = 23 mm (0.9 in)
Laser Diameter at Lens = 40 mm (1.6 in)
Figure A-1: How to Read the Optical Charts
Raynger 3i Series Operator's Manual
OPTICAL
Distance from sensor
to object in inches or feet
DISTANCE: SENSOR TO OBJECT IN INCHES
0 36 60
Focus Point
0.3 in @ 24 in
1.9
0.9
23
48
8 mm @ 610 mm
0 1000 1500
DISTANCE: SENSOR TO OBJECT IN MILLIMETERS
FOCUS POINT D:S = 75:1
Focus Point D:S = Distance to spot divided by spot diameter at the focus point
Far Field D:S = Ratio at distances greater than 10x the focus distance
How to calculate spot sizes
To calculate a spot size between two
known points on an optical chart, use
the following formula:
(D x - D n )
S x = S n +
(D f - D n )
S x = Unknown spot size
S n = Smaller known spot size
S f = Larger known spot size
D x = Distance to unknown spot
D n = Distance to smaller known spot
D f = Distance to larger known spot
Diameter of target
spot size in inches
120 180
7.3
4.6
118
203
3000
5000
FAR FIELD D:S = 20:1
IR Beam Profile
Laser Profile
x (S f - S n )
Diameter of target
spot size in millimeters
Distance from sensor to
object in millimeters or meters
A-1