Wuhan Guide IR136 Instrukcja Użytkownika Pobierz pdf (Strona 70)

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

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Dewar

A vacuum walled container for thermally isolating the contents from the outside. Dewars are used for

holding and transporting cryogenic liquids.

Dew Point

The temperature at which water will condense out of a mixture of gasses. The dew point can be used as a

means of identifying the humidity of a gas volume.

Diffuse Reflections

Non-specular reflections of defocused, uniform intensity for a wide range of reflection angles. A perfectly

diffuse surface is defined as a Lambertian surface the intensity is constant no matter what the angle of

view.

Dwell Time

The length of time that the detector is allowed to observe the same location to create its radiation signal.

Normally the longer the dwell time allowed, the less noisy and more sensitive the detector will be.

Electromagnetic Radiation

The field effects given off by accelerating a charged particle in a magnetic field. Depending on field strength

and speed of acceleration, many types of electromagnetic radiation are created.

Electromagnetic Spectrum

A plot of the range of wavelengths and types of electromagnetic radiation found to exist from subsonic

waves to cosmic rays.

Emissivity, Emission

The ability of an object to radiate and absorb energy from its surroundings measured as a ratio of the

actual object emission to the blackbody equivalent emission.

Equilibrium

A condition where all of the thermal changes in a system have stabilized. 'To observe true heat flow

characteristics, a gradient must be developed across an object or interface and allowed to stabilize - this is

a thermal equilibrium.

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Wuhan Guide IR136 Instrukcja Użytkownika Strona 70