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MP Series
Users Manual, Rev. 1.0, Apr 2021
6 Operation
6.1 Target Viewing
The relationship between scan rate, target speed, and target viewing time is shown in the figure below. Please
note, the manufacturer provides the tool called "Spot Size Calculator" which allows the calculation distance
between measured lines, see section 9.1
Optical scan rate = 150 Hz
Each revolution = 6.6 ms
Target viewed for 1.6 ms
Example
Target speed = 2 m/s (6.6 ft/s)
Distance between measured lines is given by
the following formula:
2 m/s
d =
150 lines/s
i.e., During 100% mirror rotation, which takes 6.6 ms, target moves d = 0.013 m (0.51 in.)
During 25% mirror rotation (target viewing time), which takes 1.6 ms, target moves d
For MP300 linescanners, two lines are sampled per mirror revolution. This halves the distance between two lines
at the same target speed.
The MP300 linescaner works with two mirrors that cannot be matched 100% exactly due to mechanical
deviations. This can result in a slight local offset of the pixels of two consecutive lines. This deviation should be
less than one pixel. This can become visible in a thermal image by the fact that originally sharp edges are
40
Spot Size
Figure 6-1: Calculation of Target Viewing Time
= 0.013 m/line
Calculator, page 61.
Distance between the actual measured lines d is a
function of the optical scan rate, line averaging and
target speed.
Scan
Target direction
Speed = 2 m/s
= 0.003 m (0.12 in.)
1
"slightly frayed".
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