Precaution When Using Fl-400 - Hamamatsu Photonics C11440-22CU Instruction Manual

11. PRECAUTION WHEN USING FL-400

This camera uses FL-400 (scientific CMOS image sensor). Careful attention must be paid to
the following points when using FL-400:
(1) White spot
Subjecting FL-400 to extended exposures may cause failure in part of the silicon wafer,
resulting in white spots. Currently this phenomenon is not currently preventable. If
FL-400 is at a fixed temperature, recurrence of the white spot increases proportionally
with the exposure time, so this can be rectified with dark subtraction*. Cosmic ray may
generate white spot.
*
After acquiring an image using a certain exposure time is loaded, the FL-400 is exposed to darkness for the same
amount of time, and another image is obtained. After this, the difference between the images is determined, and the
data for the dark portion of the original image is nullified.
(2) Folding distortion
A rough-edged flicker may be visible when imaging striped patterns, lines, and similar
subject matter.
(3) Over light
C11440-22CU/C11440-22CU01 Instruction manual_Ver.1.4
• Be careful not to input too strong light such as high-energy laser
into FL-400 because FL-400 may be damaged by over light.
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