Dalsa Spyder2 S2-1-40 Series, User Manual

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41 Spyder2 User’s Manual
03-32-10091-04 DALSA
4.2 Optical Interface
Depending upon resolution the cameras can be ordered with different lens mounts. The
following table provides this information.
Lens Mounts
Camera
Configuration Available Lens Mount
Options
512, 1 Tap No mount, C-mount and F-mount
1024, 1 Tap No mount, C-mount and F-mount
2048, 1 Tap No mount, C-mount and F-mount
Order Option Lens Mount Configuration
S2-10-0xk40 No mount or adapter
S2-11-0xk40 C-mount
S2-12-0xk40 F-mount
E.g.S2-12-02k40 is a 1 tap, 2k, 40 MHz camera with an F-mount
All C-mount and F-mount adapters have the appropriate back focal distance for the lens
type being used. Ensure that the image circle diameter of the lens to be used is as great as
the length of the imaging region. The following table provides information regarding the
lens mount used and the back focal distance.
Mount Back Focal Distance (sensor die to
adapter)
C-Mount 17.52 ±0.25mm
F-Mount 46.5 ±0.25mm
Detailed mechanicals, including front plate opening sizes, and the distance from the
sensor die to the opening, can be found in section 4.1 Mechanical Interface.
Illumination
The amount and wavelengths of light required to capture useful images depend on the
particular application. Factors include the nature, speed, and spectral characteristics of
objects being imaged, exposure times, light source characteristics, environmental and
acquisition system specifics, and more. DALSA’s web site, vfm.dalsa.com, provides an
introduction to this potentially complicated issue. See “Radiometry and Photo
Responsivity” and "Sensitivities in Photometric Units" in the CCD Technology Primer
found under the Application Support link.
It is often more important to consider exposure than illumination. The total amount of
energy (which is related to the total number of photons reaching the sensor) is more
important than the rate at which it arrives. For example, 5
µ
J/cm
2
can be achieved by
exposing 5mW/cm
2
for 1ms just the same as exposing an intensity of 5W/cm
2
for 1
µ
s.