PI Physik Instrumente - 50 ways hexapod ROS LB 7/24

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Ohara Corp. - Optical Glass, Polish substrates 10-23

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6,181 terms

Photonics Dictionary

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figuring

The process whereby the shape of an optical surface is altered by polishing.

filament emission

The freeing of electrons from a filament in an electron tube as the result of the filament being heated by an electric current.

filament transformer

A transformer that is designed to regulate the amount of current that passes through an electron tube's filament.

filar eyepiece

A measuring eyepiece with a screw-micrometer-driven crosshair used to measure the size of the image.

fill factor

In solar energy technology, the percent of usable land covered by collectors. The horizontal collector is the only design that exhibits 100 percent fill factor.

film plane

The site behind the lens system in a camera where photographic media are positioned for exposure.

film recorder

An instrument designed to place nongraphic information, usually generated by a computer, onto photographic film. The information is generally encoded as a series of opaque and translucent spots, or...

film thickness gauge

An interferometer spectrometer designed to measure thicknesses of thin films or layers by recording the interferogram and by having a computer within the instrument to establish the distance between...

filovirus

Filoviruses are a family of viruses that are responsible for severe and often fatal hemorrhagic fevers in humans and non-human primates. The name "filovirus" is derived from their filamentous...

finderscope

A low-power telescope with a wide field of view, typically attached to a higher power telescope with a narrower field of view. This enables an observer to locate a celestial object with the...

finesse

For a Fabry-Perot interferometer or etalon, a value for the transmission bandwidth which can be calculated as the ratio of the free spectral range to the full width half maximum of the transmission...

fire cracks

Small clefts or fissures that penetrate the glass surface in the form of short-hooked crescents. Fire cracks result from a sudden excessive change in temperature.

first-order optics -> Gaussian optics

1. That branch of optics that illustrates the theory in which q is substituted for sin q in Snell's law. Effective results are achieved if the aperture and field angle are made very small. The...

first-order spectrum

The separate spectral lines formed by a diffraction grating that are characterized by one wavelength difference in path length between adjacent slits.

first-order theory -> Gaussian optics

1. That branch of optics that illustrates the theory in which q is substituted for sin q in Snell's law. Effective results are achieved if the aperture and field angle are made very small. The...

first-surface mirror -> front-surface mirror

An optical reflector with the reflective coating applied to the front surface of the substrate. This eliminates the ghost image formed with second-surface mirrors.

fixed axis of rotation

The locus of points in a system along a line that remains stationary while the remainder of the system rotates.

fixed-focus mode -> convergent beam sensing mode

A type of photoelectric proximity mode sensing incorporating a lens system to focus the light from the emitter in a small, concentrated spot at a specific point in front of the sensor. Also referred...

Fizeau fringes

Fizeau fringes are interference fringes observed in an interferometer, specifically in a Fizeau interferometer. The Fizeau interferometer is named after the French physicist Armand Fizeau, who...

Fizeau toothed wheel

A device used to measure the speed of light by adjusting the rotation of a toothed wheel so that light passing through one tooth opening is reflected through the next. This device has since been...

FLAIR

fiber-linked array image formatter

flame emission spectroscopy

A technique in photometry that uses an oxyhydrogen or oxyacetylene flame to optically excite a solution containing the sample to be analyzed.

flame excitation

The use of high temperatures, between 2000 and 3000 °C, to excite emission lines from a sample in spectroscopic analysis.

flame spectrometry

The procedure applied to flame-excited line emissions to determine spectra and wavelengths.

flame spectrophotometry

The study of the reflection or transmission properties of specimens as a function of wavelength after they have been excited by flame-analysis techniques.

flame spectroscopy

The study of flames by means of a laser emitting blue light and a spectrometer to measure the green fluorescence created by the flame chemistry.

flame spectrum

The emission spectrum formed by the radiation from a sample that has been evaporated by a nonluminous flame.

flare

Nonimage-forming light, concentrated or diffuse, that is transmitted through the lens to the image. It is frequently the result of reflections from lens surfaces, a lens barrel, shutter or lens mount.

flash photolysis

A spectroscopic technique used in the detection of free radicals by virtue of their electronic spectra. In this method, an intense light flash is used to form extensive photolysis and yield a high...

flash radiography

A technique used in radiography to obtain an unblurred image of a moving object by the use of very short x-ray exposures, such as one microsecond, to record the image.

flash spectroscopy

The study and interpretation of the spectra of substances after they have absorbed the radiant energy emitted by a brief, intense light source.

flasher

A device that is designed to automatically turn electric lamps on and off in a rapidly repeating sequence. The device may use a motor-driven mechanism or a combination heater filament and bimetallic...

flashtube -> electronic flash unit

A small xenon-filled tube with metal electrodes fused into the ends. The gas flashes brilliantly when a condenser is discharged through the tube. The duration of the flash is primarily dependent upon...

flat -> optical flat

A piece of glass, pyrex or quartz having one or both surfaces carefully ground and polished plano, generally flat to less than a tenth of a wavelength. Optical flats are used in surface testing to...

flat pack

A slab-shaped, very low profile package for electronic components; often used when printed circuit boards must be closely stacked together.

flat-field frame

A frame taken with a CCD camera of a surface that is evenly illuminated by diffuse light. This frame shows irregularities in the light-sensing ability of the CCD, such as electronic defects and dust...

flatbed scanner

An imaging device analogous to a drum scanner, but operating at greater speeds; it uses a row of sensors to traverse an image affixed to a flat surface.

flexible display

A flexible display refers to a type of electronic visual display that is designed to be bendable, foldable, or rollable, allowing for unconventional form factors and enhanced portability. Unlike...

flicker

The fluctuation in apparent illumination that has a rate comparable to the reciprocal of the period of persistence in vision.

flicker photometry

Heterochromatic photometry that depends on the elimination of chromatic flicker at a lower frequency than luminance flicker.

flint glass

One of the two major types of optical glass, the other being crown glass. Flint glass is softer than crown glass, has a higher dispersion and usually a higher refractive index.

FLIP

floating index point; floating point interpretive program

flip chip

An optical switch that controls conduction paths into and out of a junction in fiber optic and integrated optical circuits.

FLLS

focused laser lithographic system

flooding compound

A material that surrounds a fiber optic cable's buffer tubes to prevent moisture from entering if the jacket is breached.

Floquet-Bloch oscillations

Floquet-Bloch oscillations refer to a phenomenon in condensed matter physics, specifically in the context of periodic potential systems subjected to an oscillating external field or periodic...

flow camera

An automatic camera that can record reduced images of documents at a rate of up to 30,000 documents per hour by having the film and documents move synchronously in opposite directions.

flow channel

In various fields such as fluid dynamics, microfluidics, and biotechnology, a flow channel refers to a defined pathway through which a fluid (liquid or gas) flows. The channel can be of various...

flow chemistry

Flow chemistry, also known as continuous-flow chemistry, is a chemical manufacturing process where reactions take place in a continuous stream of fluids (liquids or gases) rather than in batch...

flow cytometry

Flow cytometry is a powerful technique used in biology and medicine for the quantitative analysis of the physical and chemical characteristics of cells and particles suspended in a fluid. The method...

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