Photonics Dictionary

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NDT

nondestructive testing

HNDT

holographic nondestructive testing

Kundt effect -> Faraday effect

The Faraday effect, named after the English scientist Michael Faraday, is a phenomenon in physics where the polarization plane of light is rotated when the light passes through a transparent medium...

Prandtl number

Ratio of the molecular diffusion coefficients of momentum in terms of heat; used in convection studies.

holographic nondestructive testing

The application of coherent wavefront techniques to the determination of the physical state of a system without appreciably altering that state.

nondestructive testing

Any testing method for materials and components that does not damage or destroy the test sample. Some of the methods used are x-ray, ultrasonic, electro-optic and magnetic testing.

baseband

The simplest method of transmission on a local area network. The entire bandwidth of the cable is used to transmit a single unmodulated digital signal. Baseband transmission is capable of...

DGaO

Deutsche Gesellschaft für angewandte Optik (German Society for Applied Optics)

distal end

The end of an optical fiber farthest from the source of illumination.

exciter lamp

A small incandescent lamp whose intense beam is focused on the optical soundtrack of a motion picture film. The soundtrack modulates the beam, which in turn is detected by a photocell that produces...

gray scales

Transparencies that represent progressive steps in the amount of transmitted radiation for administering predetermined amounts of radiation to a radiation-sensitive substance. The steps are...

meter;mass;milli- m is the standard unit symbol for length in the International System of Units (SI). 1 meter is equivalent to 3.28 feet. m is also the standard symbol for mass; m is also the standard SI metric unit prefix milli- which represents one thousandth i.e. 10-3, of a given unit.

milliampere (or milliamp in English) which represents one thousandth, i.e. 10-3, of the SI unit for electric current that is the ampere (also commonly referred to as amp).

mAs

milliamperes-second - unit measure of electric charge acquired when multiplying the electric current in milliamperes (one thousandth or 10-3 of the standard unit for electric current the ampere) by the time in seconds. It is commonly used to describe the length of time that electrons are produced or passed through a given circuitry.

mcd

millicandela — The millicandela is equivalent to one thousandth (or 10-3) of the standard unit of luminous intensity that is the candela, which is the power emitted by a given light source in a particular direction.

meV

milli-electronvolt — A unit of energy that is equivalent to one thousandth (10-3) of the unit of energy which is the electron volt (eV).

millifarad — A unit of capacitance that is equivalent to one thousandth (10-3) of the standard unit for capacitance which is the farad.

milli (m)

In the SI system, prefix meaning one-thousandth, 10-3.

millibar (mbar)

A unit of pressure, one-thousandth of a bar, equivalent to 100 Pascal and 0.75 torr. One atmosphere equals 1013 mbar.

millidiopter

A unit of metric measure equivalent to 1 thousandth (or 10-3 ) of the standard unit of optical power which is the diopter (1 millidiopter is 0.001 D). The power of a lens in millidiopters is the...

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...

solar wind