4-28

1.0

DISTANCE FROM REFERENCE PLANE OF SENSOR – mm

0

2.5

4.0

0.2

3.0

0.4

0.6

0.8

3.5

PREFERRED ORIENTATION

NON-PREFERRED ORIENTATION

d

WHITE

BLACK

100 %

90 %

10 %

0

4.5

5.0

5.5

1.0

DISTANCE FROM REFERENCE PLANE OF SENSOR – mm

0

2.5

4.0

0.2

3.0

0.4

0.6

0.8

3.5

PREFERRED ORIENTATION

NON-PREFERRED ORIENTATION

d

WHITE

BLACK

100 %

90 %

10 %

0

4.5

5.0

5.5

Preferred Orientation

At maximum signal point (MSP)

and/or when the sensor is in

focus, the orientation of the

sensor is unimportant. However,

as one moves away from MSP

and/or moves out of focus (either

by distance or angle), the pre-

ferred orientation indicated above

is recommended to maintain a

higher resolution spot size.

Figure 9A. HEDS-1200 System Optical Step Response Variation with Distance.

Figure 9B. HEDS-1300 System Optical Step Response Variation with Distance.