FLIR ThermoVision Micron User Manual page 22

ThermoVision® Micron/A10 User's Guide 412-0006-10 Version 130
Dynamic-Range-Control Mode: Micron/A10 provides a low-temperature (high-sensitivity)
state intended for imaging scenes that are nominally less than 150
high-temperature (low-sensitivity) state intended for imaging up to 500
Dynamic-Range-Control modes are provided for selecting the gain-state:
1. Automatic. In the optional Automatic mode, the camera automatically selects the
optimum state, low-temperature or high-temperature, based on scene content.
2. High-Sensitivity or Low Scene Temp. The camera operates exclusively in the low-
temperature (high-sensitivity) state.
3. Low-Sensitivity or High Scene Temp. The camera operates exclusively in the high-
temperature (low-sensitivity) state.
The current NUC table shows the active Non-Uniformity Correction table the camera is
using. The NUC table will automatically be selected when in Automatic mode.
Note: If your camera does not include the optional automatic dynamic-range-control feature,
you will not have the option of selecting this mode via the Control Panel. You will have the
ability to manually select Low Temp. or High Temp. modes.
Flat-Field-Correction Mode: Micron/A10 includes internal mechanisms for periodically
improving image quality via a process called "flat-field correction" (FFC). During FFC, a
small calibration flag rotates in front of the detector array, presenting a uniform temperature
(i.e. a "flat field") to every detector element. While imaging the flat-field, the camera
updates correction coefficients, resulting in a more uniform array output. The video image is
frozen during the entire process, which takes approximately half a second, and it resumes
automatically thereafter. Repeating the FFC operation often prevents the imagery from
appearing "grainy". This is especially important when camera temperature is fluctuating,
such as immediately after turn-on and/or when ambient temperature is drifting. FFC can be
commanded manually at any time using the FFC command in the Control Panel menu bar
(see Section 7.1.5). Omega™ also provides two FFC modes for configuring automatic FFC
conditions:
1. Automatic. In the Automatic FFC mode, the camera performs FFC whenever its
temperature changes by a specified amount or at the end of a specified period of time
(whichever comes first). When this mode is selected, input windows are available on the
Control Panel for specifying the temperature change and the time period that trigger
automatic FFC. The temperature change is specified in degrees, with valid values in the
range 0.5C to 10C (1.0 to 18.0F) in 0.1 degree increments. The time period is specified
in seconds, with valid values in the range 30 to 530 seconds.
Note: It is recommended to use the factory default values for the two automatic-FFC
parameters if possible. These values were selected to maintain a high degree of image
quality over all camera operating conditions.
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