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ZENITH

ZENITH is a system for assessing the infrared (IR) signature of a moving target at sea and can be used either from the shore or from a helicopter. It provides a temperature calibrated high resolution image of the ship under test and performs a temperature and radiometric analysis in order to identify an infrared signature.

The results of the measurements and analysis are stored in a database allowing further post processing. Its modular and flexible architecture allows the standard system to easily be adapted and customized to a customer’s requirements. ZENITH is easily transportable and can be operated in an outdoor environment.

Composition and Operation:

ZENITH is composed of two sub-systems, a mobile sub-system and a target sub-system.
The mobile sub-system is either installed on shore (for horizontal measurements) or temporarily fitted to a helicopter (for elevations greater than 0°). The system includes:

  • Mid-Wave Infrared (MWIR) camera
  • Very Long-Wave Infrared (VLWIR) camera
  • Laser Range Finder (LRF)
  • Global Positioning System (GPS)
  • Database and Post-Processing software

The target sub-system is installed on the ship under test and includes:

  • Visibility meter
  • Pyranometer (to measure solar irradiance)
  • Weather Station
  • Global Positioning System (GPS)
  • Blackbodies for camera calibration

The two systems are connected by a radio link for time-stamped data synchronization. Starting and stopping data acquisition can be controlled by remote control.

Post Processing:

Once collected, ZENITH stores the measurementsin a database and can then output the data in Cartesian graph, polar graph or CSV file formats. In addition post-processing software is able to provide several further types of output including:

  • Transmission and extinction coefficients.
  • Absolute apparent and corrected radiant intensity analysis of the target versus the azimuth.
  • Contrast apparent and corrected radiant intensity analysis of the target versus the azimuth (analysis in respect to the background).
  • Temperature analysis of the target for a particular aspect angle (analysis of target hot spots).
Mid-Wave Infrared (MWIR) camera specifications
Wavelength from 1.5 to 5.0 µm
Resolution 640 x 512 pixels
Calibration Temperature from -20°C to 500°C
Noise Equivalent Temperature Difference (NETD) @ 25°C < 25mK
Filters 3-5 µm (WI_3.00-5.00_0.50%)
3.7-4.8 µm (WI_3.70-4.80_0.50%)
Neural density filter Neutral Density 1-5µm - 25% Filter
Very Long-Wave Infrared (VLWIR) camera specifications
Wavelength from 7.7 to 11.5 µm
Resolution 350 x 256 pixels
Noise Equivalent Temperature Difference (NETD) @ 25°C < 25mK
Filters 8-9.2 µm 1 inch
Neural density filter Neutral Density 7-13µm - 25% Filter