Edmund Optics - Manufacturing Services 8/24 LB

Photonics Marketplace

Suppliers Products

Handbook Institutions Dictionary

Show Filters

Hide Filters

Type

DefinitionsAbbreviations/Acronyms

Browse by Letter

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

Opto Diode Corp. - PbS &PbSe Detectors 10-24 HP

8,726 terms

Photonics Dictionary

ratiometry

Ratiometry is a technique used in various scientific fields, particularly in analytical chemistry and biochemistry, to measure concentrations or quantities by comparing the intensity of two different...

raw glass

A term that describes any state of glass before its manufacture as an element.

ray

A geometric representation of a light path through an optical device; a line normal to the wavefront indicating the direction of radiant energy flow.

ray intercept plot

A graph of the intersections of a fan of rays with the final image plane, plotted as a function of the positions of the rays in the pupil of the system.

ray tracing

Ray tracing is a rendering technique used in computer graphics to simulate the way light interacts with objects in a scene. It involves tracing the path of rays of light as they travel through a...

Rayleigh criterion of resolving power

When a lens system with a circular aperture is free of aberrations, the image of a point object will appear as a disc of finite size surrounded by concentric rings. When two points are separated such...

Rayleigh interferometer

A device that is used to determine the index of refraction of a gas or liquid through the interference patterns formed by two beams of light, one of which has been transmitted by the sample. A single...

Rayleigh limit

The restriction of wavefront error to within a quarter of a wavelength of a true spherical surface to assure essentially perfect image quality.

Rayleigh line

That element of a spectrum line in scattered radiation having a frequency equal to that of the corresponding incident radiation, due to ordinary or Rayleigh scattering.

Rayleigh prism

A prism system designed to produce a very high dispersion of light.

Rayleigh range

In the region of a Gaussian beam focus by a diffraction-limited lens, it is the axial distance from the point of minimum beam waist (Wo) to the point where the beam diameter has increased to .

Rayleigh scattering

Rayleigh scattering is a phenomenon that occurs when light waves interact with particles or molecules that are much smaller than the wavelength of the light. It is named after the British scientist...

RBDE

radar bright display equipment

RBOC

regional Bell operating company

RBS

Rutherford backscattering spectrometry

RBV

return beam vidicon

Rockwell hardness

reaction chamber; resistance × capacitance

RCVR

receiver

rad

RDA

radar data acquisition

RDS

rapid display system

reactive evaporation

Reactive evaporation refers to a process in thin-film deposition where a material is deposited onto a substrate through evaporation, and chemical reactions take place during or after the evaporation...

reactor

In chemistry, a device in which a chemical reaction takes place. In electronics, a device that introduces reactance into a circuit.

read screen

The transparent component of an optical reader that transmits the image rays of the characters to be read.

read-only memory

An optical storage product that can be used for playback only.

read-out integrated circuit

A read-out integrated circuit (ROIC) is an electronic device used in imaging systems, particularly in infrared (IR) and other sensing technologies. It is designed to interface with an array of...

read-write capability

In an optical data storage system, denoting the optical head's ability both to record information and to detect it for playback.

read-write head

That part of a magnetic or optical tape or disc drive that retrieves data from or records data on the recording media.

reading glass

A low-power magnifier that usually has a large diameter.

reagent

A reagent is a substance or compound that is used in a chemical reaction to bring about a specific transformation or to detect the presence or absence of another substance. Reagents are employed in...

real field -> true field

The size of the field of view in the object space of an optical system as differentiated from that in the image space (apparent field).

real holographic image -> conjugate holographic image

Also known as real holographic image. The indistinct, highly distorted image produced on the side of the hologram closest to the observer, in addition to the primary image. When the location of the...

real image

An image that is formed when rays emerging from an optical system all converge to a point on the optical axis. A real image can be seen on a screen in the image space of the given optical system.

real image

real-time processing

The ability of a vision system to interpret an image in a short enough time to keep pace with most operations.

ream

A nonhomogeneity of index in flat glass that is in the form of an approximately plane layer.

rear facet monitor

A photodetector mounted in the same package as a laser diode that is positioned to monitor the output from the rear facet of the diode.

rear focusing

A type of internal focusing in which only the lens elements closest to the rear of the lens barrel are moved.

rear operating aperture

The restricting opening at the rear of a lens or prism that is commonly defined as the maximum diameter of the emergent cone for the specified field of view, at infinity focus.

receiver primaries

Also known as display primaries. Colors formed by a television receiver that are of constant chromaticity and variable luminance, and that, mixed in certain proportions, form other colors. Red, green...

receiver

A detector and signal demodulator used in optical communications systems to receive a signal and often to translate it into an electronic signal.

reciprocal megakelvin -> microreciprocal degree

An approximated measure of the smallest change in color temperature detectable by the human eye, defined as the reciprocal of the color temperature times 106. Also called mired or reciprocal...

reciprocal second (Hz)

The fundamental wavelength standard of time or frequency. An atomic standard, it is properly expressed as 9,192,631,770 times the frequency of the transition between the hyperfine structure levels of...

reciprocity failure -> Bunsen-Roscoe law

The law stating that the amount of chemical change produced is proportional to the amount of light absorbed. Actually, the change is also dependent on the intensity of light -- a fact named the...

reciprocity law

With respect to photography, the law stating that the optical density of an exposed emulsion with standard development is a function of just the irradiance and the exposure times.

recombinase polymerase amplification

Recombinase polymerase amplification (RPA) is a molecular biology technique used to rapidly amplify specific DNA or RNA sequences under isothermal conditions, meaning it does not require the...

recombination radiation

The radiation emitted in semiconductors when electrons in the conduction band recombine with holes in the valence band. If population inversion occurs between portions of the valence and conduction...

reconfigurable optical add/drop multiplexer

A reconfigurable optical add-drop multiplexer (ROADM) is a key component in wavelength-division multiplexing (WDM) optical communication networks. It allows for flexible and dynamic routing of...

reconstructed image

An image that appears when a hologram is illuminated by a suitable light source, generally a laser beam.

<
1
2
3
...
134
135
136
137
138
...
173
174
175
>

Photonics Dictionary

Need Help?