Wuhan Guide IR136 Manual do Utilizador descarregar pdf (Página 86)

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

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Thermal Viewer, Thermal Data Viewer

A class of remote temperature sensing systems. This equipment class offers an image of relative radiation

levels and a means for obtaining temperature information from the screen. A common alternative is to have

a bulls eye target indicator and an alphanumeric overlay display of the temperature and the operator

selected emissivity.

Thermal Video System

A class of remote temperature sensing systems. This class of equipment is characterized by a fully

calibrated display screen, video output, provision for the standard optical and data handling accessories.

Thermocouple

A device which can measure temperatures, usually by contacting the device to be measured. The device is

made from a junction of dissimilar metals, as the junction changes temperature, a voltage is created which

is read by a previously calibrated meter.

Thermoelectric Cooling

A solid-state device which converts current into a temperature difference between two junctions. It is

possible to put thermoelectric junctions in series or parallel to increase either the overall temperature drop

or their power.

Thermogram

A two dimensional hard copy record of the apparent scene temperatures displayed on an IR system

(usually a photograph of the display).

Thermography

The study of remote temperature measurement.

Thermometer

A meter for measuring temperature.

Thermopile

A number of thermocouples whose junctions are assembled in series to magnify the Seebeck voltage and

increase the sensitivity of the reading. Thermopiles have been used in remote sensing pyrometers.

Transmittance (Transmissivity)

A measurement of the ability of a material to pass radiation from one side to the other without absorbing or

reflecting it. Transmittance is the ratio of transmitted radiant energy to total irradiance.

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