Wuhan Guide IR136 Manual de usuario descargar pdf (Pagina 66)

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

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Background Temperature

The average temperature of the environment around an object under study. The background temperature

creates the radiation level available as reflected energy.

Background Noise

The noise present in a sensor (detector) independent of the signal strength or ambient temperature.

Band pass Filter

A filter that is transparent for a range of wavelengths and opaque (reflective or absorptive) for wavelengths

outside this band pass region.

Bandwidth

A range of wavelengths or frequencies passed or processed. Typically used in both electronics and optics

to designate the operating range of a filter or electronic component.

Blackbody

An ideal thermal radiator, usually one whose temperature can be controlled, radiating and absorbing the

maximum possible thermal radiation for the set temperature. (Emissivity = 1.0, Reflectance = 0.0,

Transmittance = 0.0).

Bolometer

A temperature measuring instrument using a strip thermistor to achieve higher sensitivity than a simple

thermistor. Unlike thermistors which are used for contact temperature measurements, bolometers can be

used to measure radiation levels.

Burst Device

The safety device limiting the pressure in a high pressure gas container by allowing the gas to exit the

container if the pressure exceeds the burst limit. These devices are usually made of a frangible disc in

close proximity to a knife edge. The disc operates as a diaphragm that is pushed into contact with the knife

edge as the pressure increases.

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Wuhan Guide IR136 Manual de usuario Pagina 66