Low-SWaP Continuous Zoom Lens Designed for MWIR 10μm VGA Detectors
The Ophir LightIR 18-225mm MWIR f/3.6 continuous zoom lens is a compact thermal imaging lens, optimized for 10μm pitch VGA FPA (focal plane array) detectors. It weighs only 300gr, which makes it 25% lighter than existing similar lenses. It features a compact optics design, with reduced optical elements that significantly decrease the length and weight of the lens, and therefore, the overall size and weight of the optical system in which it is incorporated.
With its disruptive combination of SWaP capabilities, detection range exceeding 15km, rugged design, and cost-effective pricing, the LightIR 18-225mm f/3.6 continuous zoom lens is an enabler for advanced drone, tactical UAV IR cameras, and micro-/mini tactical payloads in the commercial, homeland security, and defense markets.
Additional CAD file downloads are not available for this product.
lightir-18-225mm-f-3-6-2 - Drawings
Additional drawings are not available for this product.
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
<305 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 +75ºC
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)
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