Optikos

The Optical Engineering Experts

input device

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That part of testing equipment that acquires the image under test and transmits it to the computer for analysis. An optical input device is used in an electro-optical image system where the output of the unit under test is an optical image. An electronic input device is used in an … [Read more...]

Image intensifier

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An electronic device that liberates electrons at its anode when photons are incident. This electron current is amplified and impinges on a small phosphor screen to form an intensified image. Typically used in night vision goggles. At Optikos, an image intensifier is measured by … [Read more...]

image

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A reproduction of an object produced by light rays. An image-forming optical system gathers a beam of light diverging from an object point and transforms it into a beam that converges toward or diverges from another point, thus producing an image. If the beam converges to a point, a real image is … [Read more...]

Fourier analysis

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It is possible to express a periodic function as a summation of sinusoidal components called Fourier components. In optics, the object and image can also be looked upon as being synthesized from Fourier components of different spatial frequencies. … [Read more...]

Foucault knife-edge test

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A test performed by moving a knife-edge laterally into the image of a small point source. The eye, or camera, is placed immediately behind the knife-edge, and the exit pupil of the system is observed. … [Read more...]

Forward looking infrared (FLIR)

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A night-vision device that uses one of more infrared transducers to scan a scene in the 3 to 5 µm or 8 to 12 µm spectral regions, convert the infrared radiation to electronic data and present the resulting image on a televisionlike display. … [Read more...]

Flange focal distance (FFD)

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The distance between the locating surface of the lens mount and the image plane. At Optikos, our OPTEST™ MTF Testing System measures flange focal distance among other things. For more information, click on the image below. OPTEST™ MTF Testing System … [Read more...]

Field stop

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A physical stop close to the image plane limiting the field angle of ray bundles that reach the image plane, thus  Determining the field-of-view of an optical system. … [Read more...]

Field of view

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The extent of an object that can be imaged by an optical system. At Optikos, our LensCheck™ LWIR, LensCheck™ VIS, and the OPTEST™ MTF Testing System all measure field of view among other things. Click on the images below for more … [Read more...]

Effective focal length (EFL)

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The distance from the second principal point to the focal point. At Optikos, our LensCheck™ LWIR, LensCheck™ Vis, and the OPTEST™ MTF Testing System measure effective focal length among other things. LensCheck™ LWIR   LensCheck™ VIS   OPTEST™ MTF Testing System … [Read more...]

distortion

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A general term referring to the situation in which an image is not a true-to-scale reproduction of an object. Various types of distortion include: anamorphic, barrel, curvilinear, keystone, panoramic, perspective, pin-cushion, stereoscopic, tangential, and wide-angle distortion. … [Read more...]

Cutoff frequency

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The spatial frequency at which the optical transfer function falls to zero. The cutoff frequency for a diffraction limited lens is given by: FC =1/λ F/# At Optikos, our LensCheck™ LWIR, LensCheck™ VIS, and OPTEST™ MTF Testing System all measure cutoff frequency among other things. For more … [Read more...]

Contrast

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The difference in brightness between two luminous sources, often termed modulation. At Optikos, our VLS-100 measures contrast among other things. For more information, click on the image below. VLS-100 Variable Luminance Source … [Read more...]

Collimator

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A lens or mirror used to provide a parallel beam of light. A collimator transforms an illuminated target to appear located at infinity from the perspective of the unit under test. At Optikos we have 2 products that have collimators. OPTEST™ MTF Testing … [Read more...]

Chief ray

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Any ray in object space that passes through the center of the entrance pupil of an optical system. Any ray in object space that passes through the center of the entrance pupil of an optical system. At Optikos, chief ray is measured by our OPTEST™ MTF Testing System and LensCheck™ VIS. For more … [Read more...]

Calibration reference

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Any known value derived from standard analysis that serves as a reference to the accuracy of an instrument or process in determining one or more variables. At Optikos, we have the RAD-900 which calibrates IR test stations. … [Read more...]

Blackbody

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An ideal body that completely absorbs all radiant energy striking it and therefore appears perfectly black at all wavelengths. The radiation emitted by such a body when heated is referred to as blackbody radiation. An ideal body that completely absorbs all radiant energy striking it and therefore … [Read more...]

azimuth

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Two perpendicular fans of light rays emanating from a point source are called the radial (or sagittal) azimuth and the tangential azimuth. … [Read more...]

Aspheric

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A surface that is not spherical. At Optikos, we measure surfaces with our SMI Surface Measurement Instrument. SMI Surface Measurement Instrument … [Read more...]

Aberration

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If you have an aberration you have a defect in an image. At Optikos, we have products that measure aberration. Check out our products below. LensCheck™ LWIR LensCheck™ VIS   OpTest™ MTF Testing System   … [Read more...]

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Optikos Corporation
107 Audubon Road, Bldg. 3
Wakefield, MA 01880
USA
+1 (617) 354-7557

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