Optikos

The Optical Engineering Experts

Minimum resolvable temperature difference (MRTD)

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Measured in degrees C as a function of target spatial frequency when using an infrared source unit with a 4-bar target pattern. MRTD is a standard performance measurement for Thermal Imagers. It is the temperature difference at which an operator should be able to resolve the general class of target … [Read more...]

Surface Measurement Instrument

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A high speed surface topography instrument that characterizes spherical, toric, and aspheric surfaces. At Optikos, we have our own surface measurement instrument called the SMI Surface Measurement Instrument. For more information, click on the image below. SMI Surface Measurement Instrument … [Read more...]

Shack-Hartmann

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An optical instrument used to characterize an imaging system. At Optikos, our SMI Surface Measurement Instrument uses a Shack-Harmann. For more information, click on the image below. SMI Surface Measurement Instrument … [Read more...]

Chromatic aberrations

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Chromatic Aberrations is a type of distortion in which there is a failure of a lens to focus all colors to the same convergence point. At Optikos, chromatic aberrations are measured by our OPTEST™ MTF Testing System and LensCheck™ VIS. For more information, click on the images below. OPTEST™ MTF … [Read more...]

Chief ray angle (CRA)

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A chief ray is the ray from an off-axis object point which passes through the center of the aperture stop of an optical system. The chief ray enters the optical system along a line directed towards the midpoint of the entrance pupil, and leaves the system along a line passing through the center of … [Read more...]

Reticle

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An optical element located at an image plane, containing a pattern that assists in pointing an instrument or measuring target characteristics. … [Read more...]

Reticle

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An optical element located at an image plane, containing a pattern that assists in pointing an instrument or measuring target characteristics. … [Read more...]

Resolution target

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A chart on paper or glass containing a series of sets of lines at progressively smaller spacing and used to ascertain the limiting number of lines per millimeter that an optical system is capable of resolving, or separating clearly. … [Read more...]

Phase transfer function (PTF)

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The determination of the relative phase shift of an image as a function of frequency. At Optikos, our I-SITE™ Electro-Optical Testing System, OPTEST™ MTF Testing System, and TTG- Test Target Generatormeasure phase transfer function (PTF) among other things. For more information, click on the images … [Read more...]

Radiometer

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A device used to measure radiant flux using the SI system of measurement. Radiometer most often describes a device that quantifies infrared radiation. The Optikos RAD-900 has been discontinued.    … [Read more...]

principal axis

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A straight line connecting the curvature centers of the refracting lens surfaces. In a mechanical sense, a line joining the centers of a lens as it is placed in a mount. The principal axis is the optical axis of a lens. … [Read more...]

Point spread function (PSF)

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In an optical system, the energy intensity distribution about the image of a point source. At Optikos, Point Spread Function (PSF) is measured by our I-SITE™ Electro-Optical Testing System. For more information, click on the image below. I-SITE™ Electro-Optical Testing System … [Read more...]

source scanning

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A procedure in which the image of the reference object is scanned against the fixed edge or slit at the image plane of the lens under test by mounting the source. … [Read more...]

Photonics

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The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification, and detection by optical components and instruments, lasers and other light sources, fiber optics, … [Read more...]

slit

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An aperture, usually rectangular in shape, with a large length-to-width ratio, and a fixed or adjustable shape through which radiation enters or leaves an instrument. … [Read more...]

Photometric camera

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An instrument which measures the performance of optical and electro-optical devices and systems. It produces an objective and repeatable simulation of the human visual response to characterize the performance of electro-optical systems. At Optikos, we have the PMC-600 Photometric Camera. For more … [Read more...]

photometric

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Pertaining to the measurement of visible light in an objective manner that requires simulating the spectral response of a standard human observer. … [Read more...]

perfect lens

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A theoretical, ideal lens capable of producing perfect images. Used as a lens design and analysis tool to image collimated output from an afocal system. … [Read more...]

Optics

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That branch of physical science concerned with vision and certain phenomena of electromagnetic radiation in the wavelength range extending from the vacuum ultraviolet at about 40 nm to the far infrared at 1 m. At Optikos, optics are measured with our Optical Metrology Services (OMS) and designed … [Read more...]

optical head

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In compact disk and CD-ROM technology, the portion of the drive that projects the laser light onto the surface of the media and picks up the resulting reflections read as data. The head includes the laser, the photodetector, and the optical train consisting of prisms, collimating lens, and objective … [Read more...]

Toric lens

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A lens having one or more toroidal surfaces. A toroidal surface is one having a maximum power in one meridian and a minimum power in a perpendicular meridian. In ophthalmic optics, toric lenses are used to correct astigmatism. At Optikos, our system in SMI Surface Measurement Instrument measures … [Read more...]

optical bench

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A support for optical parts comprising a solid bed that permits precise movement of components relative to each other. This usually includes a number of sliders equipped with holders for lenses, lamps, apertures, eye pieces, ground glass, etc. … [Read more...]

Ophthalmic

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Pertaining to the human eye. At Optikos, IOL lenses are measured by out OPTEST™ MTF Testing System and contact lens' fabrication is measured by our SMI Surface Measurement Instrument. For more information, click on the images below. OPTEST™ MTF Testing System   SMI Surface … [Read more...]

Off-axis paraboloid

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A paraboloidal mirror which is shaped so as to give a focus off its symmetrical axis. Used to produce a uniform collimated parallel beam of light without an obscuration, or to decollimate a parallel beam producing an image off-axis. At Optikos, an off-axis paraboloid are contained within … [Read more...]

Object generator

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The light source, filter and slit that produce the test object. A source used for modular transfer function (MTF) and line spread function (LSF) testing of optical assemblies. At Optikos, we have an object generator contained within our OPTEST™ MTF Testing System, LensCheck™ LWIR, and … [Read more...]

Thermal imaging

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The process of producing a visible twodimensional image of a scene that is dependent on differences in thermal or infrared radiation from the scene reaching the aperture of the imaging device. At Optikos, our TTG- Test Target Generator and I-SITE™ Electro-Optical Testing System are measured with … [Read more...]

nodal testing

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The measurement of first and higher order properties of a lens and its formed image, including effective focal length, back focal length, aberrations, blur patterns, magnification and nodal point separation. … [Read more...]

target

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In an optical or electro-optical test system, a well-defined luminous or radiant object providing an image to be characterized. … [Read more...]

nodal points

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Of all the rays passing through a lens from an off-axis object point to its corresponding image point, there is always one ray whose angular direction in the image space is equal to that in the object space. The nodal points are the two points at which these two external rays appear to intersect … [Read more...]

nodal bench

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A optical test bench with instrumentation which generally includes a collimator, microscope, positioners and a nodal slide used to rotate a lens about its second nodal point. The nodal bench is used to determine the cardinal points of a lens so that measurements of focal length, back focal length, … [Read more...]

Modulation Transfer Function

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Describes the ability of a lens system, as a function of spatial frequency, to transfer object contrast to the image. Mathematically it is the ratio of the object to image contrast at each spatial frequency. At Optikos, our LensCheck™ LWIR, LensCheck™ VIS, OPTEST™ MTF Testing System, and … [Read more...]

Variable luminance source

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A device manufactured by Optikos designed to produce a controllable source of uniform illumination for testing cameras, image interface, and night vision devices. At Optikos, we have our VLS-100 which is a variable luminance source. For more information, click on the image below. VLS-100 Variable … [Read more...]

Minimum detectable temperature difference (MDTD)

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The minimum temperature difference at which an operator of an infrared system can detect that an object is present. Expressed as a function of object frequency (size). At Optikos, our I-SITE™ Electro-Optical Testing System measures MRTD and our TTG- Test Target Generator is a source for MRTD. For … [Read more...]

Minimum resolvable temperature (MRT)

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In a thermal imaging system, the smallest change in blackbody equivalent temperature that can be detected clearly by the system as a function of target frequency. At Optikos,  our I-SITETM Electro-Optical Testing System measures MRT and our TTG- Test Target Generator is a source for MRT. For more … [Read more...]

Mid-wave infrared (MWIR)

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A wavelength range in the infrared that is commonly used for imagingapplications, nominally 3.0 to 5.0 μm. At Optikos, our Midwave-Infrared Laser Unequal Path Interferometer and BBS-200 Blackbody Sourceprovide and measure in MWIR. For more information, click on the images below. Midwave-Infrared … [Read more...]

micro-optics

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Tiny (less than 2 mm in diameter) lenses, beam-splitters and other optical components used, for example, in endoscopes, microscopes for telecom applications. … [Read more...]

Long-wave infrared (LWIR)

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A wavelength range commonly used for imaging applications, nominally 7 μm to 14 μm. At Optikos, ourLensCheck™ LWIR, TTG- Test Target Generator, and BBS-200 Blackbody Source all measure in LWIR. For more information, click on the images below: LensCheck™ LWIR   TTG - Test Target … [Read more...]

line source

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In the spectral sense, an optical source that emits one or more spectrally narrow lines as opposed to a continuous spectrum. In the geometric sense, an optical source whose active (emitting) area forms a spatially narrow line. … [Read more...]

lens

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A transparent optical component consisting of one or more pieces of optical glass with surfaces so curved (usually spherical) that they serve to converge or diverge the transmitted rays from an object, thus forming a real or virtual image on that object. It is frequently used in a generalized sense … [Read more...]

Lateral chromatic aberration

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An aberration in which a lens system imaging a broad spectrum of light focuses off-axis points at different heights as a function of wavelength. Consequently each wavelength has a different effective focal length. Also known as transverse chromatic aberration. At Optikos, lateral chromatic … [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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