2 – Introduction
X-Series User’s Manual
9
2.4 Key features of the X-Series science cameras
Improved Linearity to Zero Well-Fill
Typical direct injection ROIC designs exhibit a non-linear response when the signal drops
below 10% of well-fill. Both the ISC0804 and ISC1308 ROICs provides linear response even
at very low signal levels. This results in an increased linear dynamic range, much better NUC
performance at low signal levels and it makes it easier to perform a user calibration of the
camera.
Fast Frame Rates
The X6900 and X8500sc cameras feature fast pixel clocks: 355 Megapixels per second,
which enable the X6900 camera to output 1000 frames per second at 640x512, and the
X8500 camera to output >180 frames per second at a frame size of 1280x1024 pixels. The
X6800 series frame rate is limited to approximately half the X6900 frame rate, but it has the
same 355 Megapixels per second pixel clock speed.
14-Bit Digital Image Data
The X-Series camera systems are all built around high-performance 14-bit A/D converters,
preserving the full dynamic range of the FPA.
Windowing Capability
Higher frame rates are available by windowing down at the Focal Plane Array (FPA) level.
Semi-arbitrary size and location of windows are available, limited only by the intrinsic
characteristics of the readout.
Presets
Up to four presets and their associated parameters such as integration time, frame rate,
window size and window location are available for instant selection with a single command.
These presets can be used in either Superframing or Preset Sequencing modes.
Factory Calibrations
Most variants of the X-Series cameras can be purchased with radiometric calibrations that are
performed in the calibration laboratory in Niceville, Florida using NIST-traceable calibration sources.
The calibrations translate the raw digital data from the sensor into radiometric images that can be
interpreted by software into radiance and temperature images. These factory radiometric calibrations
are stored inside the camera electronics and are linked to high-quality stored factory NUCs. The
radiometric calibrations have temperature drift correction built in that utilizes various temperature
sensors inside the camera body and on the lens interface to compensate for changes in the optics
self-radiation levels caused by changes in the camera and optics temperatures.
Independently Adjustable Frame Rates
Frame rate is user selectable from 0.0015 Hz up to the maximum allowed for the selected
window size.
Multiple Triggering Modes and Synchronizing Interfaces
The X-Series cameras provide different interfaces to support maximum flexibility for
synchronizing the camera to external events, as well as synchronizing external events to the
camera.
▫ Sync In (TTL)
▫ Built-in IRIG timing decoder (not in X6800 series)
▫ Genlock input (SD or HD) (not in X6800 series)
▫ Sync Out
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