© 2016 Thorlabs Scientific Imaging26
DCx Camera Functional Description and SDK Manual
Comparison of common sensor sizes and examples for
different fields of view
The size of each single sensor cell (pixel) depends on the size of the active sensor area and the
resolution. In general, less pixels over the same sensor area (or a larger sensor area with the same
resolution) will result in greater photo sensitivity of the sensor.
2.3.2 Micro Lenses
Micro lenses improve the fill factor
The fill factor is the percentage of the pixel area that is exposed to light during exposure. Ideally this
would be 100 %. Since other elements are located on the sensor surface besides the light-
sensitive photodiodes, this value may be reduced to approx. 30–50 %, depending on the sensor
technology. The use of micro lenses compensates for this and increases the fill factor to 90 % or
more. Micro lenses collect the light that falls onto a photocell, thus increasing the useable sensor
area.
Using micro lenses to increase the effective fill factor
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