LWIR series is a range of long-wave infrared lenses specifically designed to operate in the 8-14 μm wavelenght region with uncooled detectors (a-Si, VOx, …).

In the design of the lenses great importance was assigned to high image quality and large aperture (small F/#). These lenses can also be equipped with custom mount interfaces.

These lenses, mounted on an uncooled LWIR camera are the perfect choice for a variety of applications spanning from industrial to military, including temperature measurement for process quality control and monitoring, predictive maintenance, imaging through smoke and fog, medical imaging.

KEY ADVANTAGES

High resolution
Designed for high resolution detectors up to 15 μm pixel pitch and 21 mm diameter.
Custom mount interface
Can be equipped with a custom mount interface.
Large field of view and low distortion
Superior optical performances.
HCAR coating
For applications exposing optical elements to harsh environments.

LONG WAVE INFRARED LENSES

FL 75 mm

	Optical specifications										Mechanical specifications
Part number	Focal length	F/#	Wave length	Average trans.	Circular FOV	Working distance	Image Diagonal	Distortion	CTF @ 30 lp/mm	Image side NA	Mount	Focus type	Locking screw	Back focal length	Length	Diam.	Mass
	(mm)		(µm)	(%)	(°)	(mm)	(mm)	(%)	(%)					(mm)	(mm)	(mm)	(g)
					1		2	3			4				5		6
LW03514Infrared lens, long-wave, 35 mm, F1.4	35.00	1.4	8.0-14.0	90	33.4	350/∞	21.0	0.20	44.99	0.336	M46X1	Manual	Yes	11.88	57.62	71	300	Quote
LW05014Infrared lens, long-wave, 50 mm, F1.4	50.00	1.4	8.0-14.0	90	23.7	500/∞	21.0	0.20	40.70	0.336	M46X1	Manual	Yes	18.00	51.50	71	300	Quote
LW07514Infrared lens, long-wave, 75 mm, F1.4	75.00	1.4	8.0-14.0	90	15.9	750/∞	21.0	0.20	38.43	0.336	M46X1	Manual	Yes	14.63	106.41	85	850	Quote

Last update: 2021-06-22

Notes

Based on the listed image diagonal.
Maximum value at central wavelength.
Mean value at all the different fields.
Any custom mount is available at no additional cost.
Measured from the front end of the mechanics to the camera flange.
Given with no mount attached. See layout drawings.

Technical documents

Data table (Last update: :2021-06-22)

XLS

Product user guide

IR focusing

Coating

Opto Engineering^® MWIR and LWIR thermal lenses are HCAR coated. These thermal lenses are specifically designed to meet the needs of those applications with optical elements exposed to harsh environments, such as military vehicles and outdoor thermal cameras. This coating offers highly protective properties coupled with good anti-reflective performance, protecting the outer optical surfaces from high velocity airborne particles, seawater, engine fuel and oils, high humidity, improper handling, etc.. It offers great resistance to abrasion, salts, acids, alkalis, and oil.

Interface

All Opto Engineering^® IR lenses can be equipped with any custom mount interface. Each infrared camera comes with a different detector format and a different mount interface. This is why Opto Engineering^® has decided to provide any custom mount interface with any infrared lens at no additional cost so that these lenses can be integrated with any camera mount.

Focusing

Manual focusing mechanism, large field of view and low distortion.

High Resolution

Opto Engineering^® infrared lenses are designed for high resolution detectors up to 15 μm pixel pitch and 21 mm diameter. Common infrared lenses are designed and optimized for Focal plane arrays (FPAs) with 30 μm pixel pitch. However, as a trend, pixels are constantly decreasing their size: Opto Engineering^® IR lenses are compatible with the newest high resolution FPAs.

Specific quality testing system

Since no standardized and/or appropriate quality measurement system is available, Opto Engineering^® designed and developed a specific optical test bench for Infrared (IR) optics. The system design is based on Opto Engineering^® proprietary design optical benches used in the visible range.
Opto Engineering^® developed reliable test procedures for checking IR optics quality and resolution (MTF: Modulation Transfer Function): each lens is checked by an experienced operator.

Athermalization

Opto Engineering^® R&D team has proven expertise in designing challenging and demanding custom projects that successfully integrate optics and their mechanical housing.
Upon request, Our engineering^® team can develop both active and passive athermalized systems, either optically or mechanically compensated, that work in environments characterised by significant temperature changes.

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