Reference Manual Chapter 9
Ranger E/D
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Hardware Description
9 Hardware Description
9.1 Sensor
The Ranger E and D cameras are based on the M12 Smart Vision Sensor series.
The M12 Smart Vision Sensor is a CMOS sensor with a 2D pixel matrix, row-parallel AD-
converters, and a processor architecture that enables image processing directly on the
sensor. The sensor resolution depends on the model of the Ranger.
Thanks to this architecture it is possible to implement high resolution and high perform-
ance image processing application. This makes the sensor extremely well suited for 3D
measurements, and makes this SICK sensor unique.
9.1.1 Light Sensitivity
The collected light charge in the Ranger camera can be AD-converted to 8 bits digital data
that represent a gray scale value from 0 to 255. One AD unit represents one LSB in this 8-
bit conversion.
The unit in the spectral response graph below is (AD units per pixel)/(µJ/cm
2
) which repre-
sents the digital gray value in a pixel over incident light energy. To obtain (AD units per
pixel)/(incident light power) instead of energy, multiply the value with the integration time
used.
Figure 9.1 – Spectral response for M12 sensor with glass lid
The peak sensitivity of 2640 (ADu per pixel)/(µJ/cm
2
) is located at 710nm.
The spectral response of the high-resolution line in a Ranger E55 camera is approximately
the same to the spectral response of the pixel matrix.
Light wavelength [nm]
Response
[ADu per pixel / (µJ/cm
2
)]
3000
2500
2000
1500
1000
500
300 400 500 600 700 800 900 1000 1100
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