Photonics Dictionary: A

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analog

A physical variable that is proportionally similar to another variable over a specified range. An analog recording contains data that is similar to the source.

analog adaptive resonance theory

Analog adaptive resonance theory (AART) is a neural network model within the broader framework of adaptive resonance theory (ART), which was introduced by Stephen Grossberg. ART is a cognitive and...

analog output

Information presented as a continuously variable relationship between a signal and a standard.

analog signal

A signal in the form of continuously variable voltage or current.

analog stroke

An analog method of moving a cathode-ray tube beam across a display screen face, commonly used in high-performance vector and character generators.

analog thermogram -> thermogram

Also known as analog thermogram. The resultant photograph, illustrating, in tones ranging from black to white, the spatial relationship of the infrared radiation temperatures of the different details...

analog-to-analog

Analog-to-analog (AA) refers to the process or system that involves the conversion or transmission of analog signals from one form to another, without converting them into digital signals at any...

analog-to-digital converter

A device that converts an analog signal, that is, a signal in the form of a continuously variable voltage or current, to a digital signal in the form of bits.

analog-to-digital

Analog-to-digital (A/D) is a process that converts continuous analog signals into discrete digital signals. This process coverts analog signals continuously, which vary smoothly over time, into a...

absolute (kelvin degrees), absorption, acoustic, alpha particle, analog, anode, ampere, amplitude, area, atomic, atomic mass, Helmholtz free energy, mass number, nucleon number

A/D

analog-to-digital

analog to analog, anti-aliasing (AA optical filter e.g. low pass filter), approximate absolute temperature, atomic absorption

AART

Analog Adaptive Resonance Theory

acoustical hologram

An acoustical hologram refers to a three-dimensional representation of sound waves in space, analogous to optical holography but applied to acoustic waves. Unlike visual holography, which creates...

ADC

analog-to-digital converter; allyl diglycol carbonate

ammonia maser

An ammonia maser is a device that amplifies microwave radiation using ammonia gas molecules in a process analogous to how lasers amplify visible light through stimulated emission of radiation. The...

Angstrom mode

An operational mode for radiometers that analogs the method of operation of an angstrom pyrheliometer. In this mode, the rearward-facing cavity is electrically heated, while the forward cavity is...

Photonics DictionaryA

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