Hamamatsu Corp. - Mid-Infrared LED 11/24 LB

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Opto Diode Corp. - Detector Spotlight 10-24 MR

Excelitas PCO GmbH - Industrial Camera 11-24 VS HP

8,726 terms

Photonics Dictionary

diffraction rings

1. The ring patterns of light that seem to encircle particles in the field of a microscope. 2. See Newton's rings.

diffraction scattering

Elastic scattering that occurs when inelastic processes eliminate particles from the beam.

diffraction spectrum

In spectroscopy, the parallel bands that vary in lightness and darkness or color, and that are formed when light is diffracted by a sample.

diffraction velocimeter -> laser velocimeter

A system that uses a continuous-wave laser to measure the velocity of an object by focusing the laser beam on the object, perpendicular to its direction of motion. An optical grating receives...

diffraction-limited lens

A lens with aberrations corrected to the point that residual wavefront errors are substantially less than one-quarter the wavelength of the energy being acted upon.

diffractive lens

Any optical device that utilizes diffraction in an image-forming capability. Familiar diffractive lenses are zone plates, holographic lenses, kinoform lenses and binary optics.

diffractive optical processors

Diffractive optical processors are optical devices that utilize diffractive optics principles to perform various computational tasks, such as image processing, pattern recognition, and optical...

diffractive optics

Optical elements that use diffraction to control wavefronts. Diffractive optical elements include diffraction gratings, surface-relief diffractive lenses, holographic optical elements and...

diffractometer

A measurement device used to study the structure of matter using the diffraction of electromagnetic radiation.

diffractometry

The study of the diffraction of beams of a wave by matter to ascertain the structure of the matter.

diffrimicroscopy -> zero-order filtering

The removal of the zero-order component of the Fourier spectrum distribution of an object with a small, opaque absorber or reflector in the Fourier plane, to produce images that appear bright on a...

diffuse density

The logarithm of the reciprocal of diffuse transmittance. Diffuse density results when a sample is diffusely illuminated.

diffuse illumination

Light emitted by one or more sources and characterized by a high degree of scatter.

diffuse modulation transfer function

Modulation transfer function of an optical element when used for transporting images from a lambertian source such as phosphors.

diffuse reflectance

Ratio of diffusely reflected flux to incident flux.

diffuse reflectance spectroscopy

Diffuse reflectance spectroscopy (DRS) is a nondestructive analytical technique used to investigate the optical properties of materials, particularly in the field of spectroscopy. Unlike traditional...

diffuse reflection

Nonspecular reflection from a rough surface.

diffuse reflector

A reflecting surface that scatters radiation that is incident on it, thus producing diffuse reflection.

diffuse sensing mode

Use of a photoelectric receiver to sense an object's presence by detecting a small amount of the emitter's light that is diffusely reflected by the object.

diffuse transmission

Transmission accompanied by diffusion or scatter to the extent that there is no regular or direct transmission.

diffuse transmittance

The ratio of diffusely transmitted flux to incident flux.

diffuse-cutting filter

A color filter that is designed to gradually increase or decrease its absorption with wavelength.

diffuser

An optical diffuser is an optical component or material designed to scatter or diffuse light that passes through it. It is used to create a more even or uniform illumination, reduce glare, or soften...

diffusing filter

A filter purposely made to be placed before a lens to render the image rather unclear.

diffusing screen

In printing, a translucent screen used with lenses to provide an even distribution of diffused light.

diffusion (light) -> light diffusion

Light diffusion refers to the process by which light is scattered or spread out in various directions as it interacts with a medium or material. Unlike direct transmission through a transparent...

diffusion disk

An embossed or marked disk, constructed out of a transparent material and used with a camera system to soften an image.

diffusion pump

A vacuum pump in which heated oil or another substance is forced through jets as a vapor that collides with gas molecules and carries them away from the chamber being evacuated.

dig

A cosmetic defect on the surface of an optical element. A dig is nearly equal in terms of its length and width. The size is specified numerically by its average diameter in 1/100 of a millimeter;...

digital

Denoting the use of binary notation; i.e., the representation of data by bits (1 or 0).

digital camera

A digital camera is a device that captures and records still images or video in digital format. Unlike traditional film cameras, which use photographic film to capture and store images, digital...

digital delay generator

An instrument that can preselect intervals, often in increments of 1, 10 or 100 ns, for the generation of electronic pulses by means of front-panel switches. Also called a time-delay generator.

digital densitometry

Pictorial information processing in which the processed picture shows a family of equidensity lines or bands coded with different printed patterns or colors.

digital filter

A linear computation or algorithm performed on a selected series in the form of an input signal that produces a new series as output. The computational device may be a specifically designed...

digital holographic microscopy

Digital holographic microscopy (DHM) is an advanced imaging technique that combines holography and digital image processing to capture and reconstruct three-dimensional images of objects. This method...

digital image processing

The technique by which an analog image is converted by any of several means into a finite array of points, each represented by some numerical value. Once created, this array can be the basis of a...

Digital Imaging and Communications in Medicine

Digital Imaging and Communications in Medicine (DICOM) is an international standard for medical imaging created by both the National Electrical Manufacturers Association (NEMA) and the American...

digital optical processing

The scanning of photographs or transparencies of images, either by a vidicon camera or flying spot scanner, for the conversion of the images to digital form for storage on magnetic tape.

digital photography

A form of photography in which an electronic camera converts an image to an electronic signal that is stored in digital format on magnetic media or film.

digital point system

A pixel-based computer graphics system that simulates the tools of an artist.

digital radiography

Medical diagnostic (x-ray) imaging using laser printers to produce high-resolution digital hard copy instead of film exposed by phosphor-intensifying screens, thus providing radiologists with greater...

digital signal processing

Digital signal processing (DSP) refers to the manipulation and analysis of signals, which are representations of physical quantities that vary over time or space. In the context of DSP, these signals...

digital subtraction

The process by which the values of one digital image of an object or scene are removed from a second slightly different image of the same object or scene.

digital twin

A digital twin refers to a virtual representation or digital counterpart of a physical object, system, or process. This digital replica is created using real-time data and simulation models, allowing...

digital video compression

A step-by-step method of reducing the amount of data in a digital video signal to transmit or store a high-quality image. The digitized picture is analyzed, and fine detail and redundant pixels,...

digital-to-analog converter

In image processing, a device that transforms the digital data into an analog video image that can be viewed on a monitor or printed.

digitizer

A device that samples and quantizes a signal in digital form for storage in memory.

dihematoporphyrin ether

A photosensitizing drug used in conjunction with photodynamic therapy.

DIL

dual in-line

dilation

In image processing, a morphology operator in which a structuring element or probe of a particular shape is moved over the input image; wherever at least one pixel of the probe touches the boundary...

Photonics Dictionary

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