SU320CSX
4110-0446, Rev. C
Page 13 of 96
© 2017 UTC
Aerospace Systems
Date Printed: 3-Jan-2017
This document does not contain any export controlled technical data.
2.1.2.
Optical Mount and Other Optical Considerations
The lens mount is a 1-inch hole with 32 threads/inch, which adheres to the C-mount standard 1-32 UN
2A. However, the camera back focal distance (flange to FPA) is not C-mount compliant and requires the
included C-mount spacer to match the C-mount standard. This hybrid mounting plate design permits
adapting the camera to a variety of standard lens mount formats, especially those with short back focal
distances.
Screw the lens into the lens mount. If using a SUI supplied SOLO lens, no spacer is needed.
Other lenses require the C-mount spacer between the lens and the camera lens mount.
The C-mount standard back focal distance is 0.69 inch / 17.5mm. The camera back focal distance is
shown in Figure 1 and Figure 2 as dimension E and is dependent on the spectral response of the camera.
The back focal distance dimension for SWIR-only cameras is listed in the middle column labeled “C” and
the back focal distance dimension for NIR/VIS cameras is listed in the column labeled “C VIS/NIR”.
The optical image plane (dimension C on Figure 1 and Figure 2) takes the index of refraction at 1550nm
and thickness of the sapphire window and InP layer into account.
The spectral response of the CSX camera is broad and beyond the range for which visible consumer and
commercial lenses have been designed. The use of SWIR-optimized lenses is strongly recommended.
Contact Sensors Unlimited, Inc. for lens options and recommendations. Commercially available visible
(non-SWIR optimized) optics are suitable for some SWIR imaging applications, particularly in bright
lighting conditions.
In cases where a visible lens is used, it should be noted that the lens focus markings will be mis-calibrated
due to the wavelength dependence of the refraction properties of the glass. Additionally, the CSX camera
does not include controls for auto iris or auto focus. Auto iris lenses that permit manual control of the
aperture in “stop-down aperture” or “depth of field” preview mode may be adapted to work with the CSX
camera.
Some lenses default their default iris position to full open. If the lens does not default to full aperture,
locate and disable the mechanical metering lever that controls the aperture via a stop or other mechanical
means to hold the lever in a desired f/stop position.
If necessary, contact Sensors Unlimited, Inc. for lens options and recommendations.
2.1.3.
Power, Trigger, and Sync Interface
The CSX requires an adapter cable to mate the power, trigger, and sync connectors to the chassis. Attach
the supplied Power, Sync, Trigger cable (PN 8030-0020) to the camera chassis POWER/AUX connection
by following these steps:
WITH ALL COMPONENTS DEENERGIZED: Connect the provided 14 pin SDR Power,
Sync, Trigger cable (PN 8030-0020) to the camera, inserting the connector until it is fully
seated and the shell is parallel to the mating panel surface. Snug (do not overtighten) the
cable retention screws. Do not make or break this connection while power is being supplied.
