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Sheetak - Cooling at your Fingertip 11/24 MR

8,726 terms

Photonics Dictionary

loss budget

The total optical power loss in a system. The loss budget is often stated in terms of the transmitted power and the power required at the receiver to express the maximum acceptable amount of loss.

lossy medium

A medium that scatters or absorbs radiation that passes through it.

loupe

A low-power (2x to 10x) magnifier consisting of a single positive lens assembly.

Lovibond tintometer

A subtractive colorimeter that expresses a liquid's or object's color as a combination of three colors. These colors are developed through viewing the specimen object through three series of slides,...

low

Term used to describe an optical surface that contacts the test glass only at its edges.

low Earth orbit

Low Earth orbit (LEO) refers to a region in space that is relatively close to Earth's surface, typically characterized by altitudes ranging from approximately 180 to 2,000 kilometers (112 to 1,242...

low excitation potential -> excitation potential

The amount of energy required to raise the energy level of an atom; a necessity if the atom is to radiate energy. High excitation potential is the amount of energy in the upper state of the...

low-coherence interference microscope

An interference microscope that uses a light beam originating from a low-coherence light source. The sample is placed in one interferometer arm, and the other arm provides a reference beam. The...

low-light-level instrumentation

Instrumentation designed to permit the perception, recording or measurement of scenes under conditions of low incident illumination.

low-loss fiber

Optical fiber that transmits a greater percentage of input light than does high-loss step-index fiber. Low-loss fiber requires higher purity materials and a more sophisticated drawing process and...

low-pass filter

In digital image processing, a method of convolution that reduces random noise by replacing the value of each pixel with the average of that pixel plus its neighbors, or of the neighbors alone. Also...

low-temperature spectroscopy

The analysis of structural and molecular dynamics caused by low temperature.

low pressure

low pass

LPE

liquid phase epitaxy

LPF

low-pass filter

lpi

lines per inch

lpW

lumens per watt

LRF

laser rangefinder

LRI

long-range radar input

LRS

laser Raman spectroscopy

laser sintering; logical sum

LSF

line spread function

LSI

large-scale integration

LSM

laser scanning microscope

LSO

laser safety officer

LST

laser spot tracker

LSU

laser scanning unit

LTD

lightcraft technology demonstrator

LTDS

laser target designation system

LTE

local thermodynamic equivalent

LTHR

lateral transfer hollow retroreflector

LTPS

lateral transitional phase shift

LTS

laser thermal simulation; laser-triggered switch

luma

The luminance portion of a composite video signal, i.e., the portion of the signal that corresponds to the brightness of the image apart from any color value, giving a monochrome, or gray scale,...

lumen

A lumen is a unit of measurement used to quantify the amount of luminous flux, which is the perceived power of light. In other words, the lumen measures the total amount of visible light emitted by a...

lumen-second

SI unit of quantity of light.

lumia

A laser effect used especially for laser light shows. Lumia are created by placing a distorting medium such as rippled glass in the path of the laser beam.

luminaire

A complete unit containing a light source, globe, reflector, housing, socket and other necessary components for lighting.

luminance

Luminous flux emitted from a surface per unit solid angle per unit of area, projected onto a plane normal to the direction of propagation. Also known as brightness and luminous sterance.

luminance factor

Ratio of the luminance of a specimen to that of a perfect reflecting or transmitting diffuser identically illuminated.

luminance meter

A type of photometer calibrated in luminance units (candles per square unit, or lamberts). In photography an exposure meter contains a luminance meter to record the average luminance of a scene.

luminance range

An objective measure of an object's brightness that is derived from the ratio of the luminance of its lightest section to that of its darkest section.

luminescence

Luminescence is the emission of light that occurs without the involved substance undergoing a significant increase in temperature. In other words, it is the production and emission of light by a...

luminescent fiber

Fiber that emits luminescent radiation excited by ultraviolet, x-ray or high-energy particles.

luminescent greenhouse collector

A collector for photovoltaic power generation that consists of a thin plate that strongly absorbs sunlight striking its faces and luminesces efficiently. A large fraction of the luminescence is...

luminosity

Luminosity refers to the total amount of energy emitted by an astronomical object, typically measured per unit time. It quantifies the intrinsic brightness of the object and is often expressed in...

luminosity curve

Plot of spectral luminous efficiency vs. wavelength.

luminous

Pertaining to electromagnetic radiation as perceived by the eye; that is, with the contributions as wavelengths in the visible region weighted according to V(λ), which symbolizes the spectral...

luminous efficacy

Quotient of total luminous flux divided by total radiant flux; lumens per watt. (For a source, quotient of total luminous flux divided by lamp power input.)

Photonics Dictionary

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