THORLABS WFS150, Operation Manual

Page: 70 / 123

68 WFS150 / WFS150C Manual
© <2007> ... Thorlabs GmbH
advantageous to do the main brightness control using the exposure time and use
low Master gain amplification factors only if the exposure control adjustment
works too coarse. Otherwise the image noise will be increased needlessly.
It is recommended to check the actual saturation degree of the camera's AD
converter by verification on the
LineView panel .
G
Attention
G
Manual settings of 'Exposure time' and 'Master gain' must not lead
neither to image saturations (pixel intensity = 255 digits) nor to
low image brightness (max. intensity < half range 128 digits).
Otherwise, measurement errors and noise will increase.
Noise Cut Level
'Noise cut level' defines a brightness level in digits which needs to be exceeded
by the spots. Ambient light and noise terms below this limit will be set to zero
intensity. See the result in the Lineview panel. Since defining such a fix level is
problematic for changing beam intensities and ambient light situations, the 'Auto'
setting is highly recommended which enables dynamic adaption to the different
intensity levels for each spot area and yields best results for centroid calculation.
For a manual definition of the noise cut level, values between 0 and 255 digits
may be applied.
G
Attention
G
Improper settings of manual 'Noise Cut Level'
may lead to increased measurement errors.
Black Level
'Black Level' is a camera setting that adjusts the offset brightness level for all
illuminated pixels and should be adjusted so that the minimum line in the
Lineview panel is to be seen above zero. In case of very high noise level reduce
the setting.
Arbitrary values range from 0 to 255.
Examples: