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680442-001
LightIR 18-225mm f/3.6
LightIR 18-225mm f/3.6, High Durability
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 680442-001 LightIR 18-225mm f/3.6 LightIR 18-225mm f/3.6, High Durability
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680442-002
LightIR 18-225mm f/3.6
LightIR 18-225mm f/3.6, Low Reflection Hard Carbon
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 680442-002 LightIR 18-225mm f/3.6 LightIR 18-225mm f/3.6, Low Reflection Hard Carbon
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WFOV (18mm)

Format
Pitch 640x512
10 µm 20º

NFOV (225mm)

Format
Pitch 640x512
10 µm 1.6º

Specifications

  • Type
    Continuous Zoom
  • Focal Length
    18-225mm
  • F/#
    3.6
  • Cold Stop FPA Distance
    12mm
  • Cold Stop Clear Aperture
    Ø3.34mm
  • Back Focal Length
    18.5mm in air
  • Minimum Focus Range
    WFOV:5m;NFOV:50m;
  • Nuc (by defocus)
    Blur to 7mm diameter , Optional: mechanical shutter
  • Focus Mechanism
    Motorized. Adjustable
  • Focus Time
    <2 sec.
  • Zoom Time
    <5 sec.
  • Weight
    <300 g
  • Dimensions
    Ø63mm x 84.6mm
  • Drive Voltage
    12V
  • Current Consumption
    < 0.5A average, 1.0A peak
  • Communication Interface
    RS422
  • Operating Temperature Range
    -32ºC to +80ºC
  • Storage Temperature Range
    -54ºC to +80ºC
  • Sealing
    IP67 front lens only
  • Wavelength Region
    MWIR

Features

LightIR 18-225mm f/4.0 Detection, Recognition & Identification (DRI) Range

DRI ranges enable one to easily estimate the maximum range that an object can be either detected, recognized or identified. It is important to note that these estimates are based solely on geometrical parameters – the target size, distance, lens focal length and camera detector pixel size. Signal level, detector sensitivity, atmospheric conditions and other factors are not considered!

The calculations used here are based on the “Johnson Criteria”. According to the Johnson Criteria, the minimum resolution, pixels on target, required to achieve a 50% probability for an observer to discriminate an object are:

  • Detection: An object is present – 2 pixels on target (Lower Bar)
  • Recognition: discern the type of object, a human vs. a vehicle – 8 pixels on target (Middle Bar)
  • Identification: discern specific objects, a man vs. a woman, a car model – 12.8 pixels on target (Upper Bar)

Resources

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