Wuhan Guide IR136 Uživatelský manuál stáhnout pdf (Strana 80)

Thermografie in der Theorie und Praxis (INTERNET: www.irPOD.net / e-MAIL: [email protected] ) © Bernd Schindel 2007

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Passive Infrared System

The normal form of infrared system in use commercially. A passive system does not generate a thermal

source to illuminate the scene, it is only acted upon. A passive system monitors the flux of photons already

being generated by the scene within its field of view.

Peltier Effect

The ability for two dissimilar metals and metal/semiconductors to create a thermal difference when current

flows across the dissimilar junction.

Photoconductor

A radiation sensitive resistor whose resistance decreases as it is exposed to radiant energy.

Photon

A single quantum of electromagnetic energy having momentum hf/c and energy hf.(h is Planck's constant, f

is the frequency of the wave and c is the speed of light).

Photovoltaic Detector

A detector which responds to radiant flux be generating current.

Pixel (Picture element)

The smallest location size on a display or in memory. The incremental location of picture information in

either horizontal or vertical direction (also called a Pel).

Polycrystalline

A material which is made to have many small crystal grain boundaries instead of one large monocrystalline

structure. Materials are made polycrystalline to increase their flexibility and strength.

Principal Plane

A mathematical construct useful in analyzing complex optical assemblies. The principal planes are

constructed at the effective focal length distance away from the lens assembly focus and serve to represent

the mathematical position of the lens assembly assuming it could be constructed as a single thin lens.

Pyrometer

An optical instrument for remote sensing and measurement of spot temperatures or radiation levels

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Wuhan Guide IR136 Uživatelský manuál Strana 80