Wuhan Guide IR136 Manual de usuario descargar pdf (Pagina 69)

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

Seite 69 von 88

D-star (D*)

A measurement of the sensitivity of a detector material in terms of signal to noise ratio. D-star is normally

expressed either as a blackbody D-star or as a peak wavelength D-star within the practical operating

frequency of the detector. The units of D-star are centimeter-square root hertz per watt.

Delta-T

The temperature difference, or change, over a period of time.

Density

A measure of object weight per cubic size.

Depth Of Field

The range of object distances which are in focus around a set focus distance value (object space distance).

Depth Of Focus

The range of motion of the focus assembly which around a set focus distance which will not defocus an

object at that focus distance (image space distance).

Detectivity

The ability of a detector to sense radiant power - the signal to noise ratio. The inverse of a noise power

reading. Detectivity is related to noise since the signal power must be at least as large as the noise power

to be distinguished as signal - not noise.

Detector, IR

A device which converts infrared irradiance into electrical energy.

Detector Element

A small area etched out of a detector material (called substrate) which does the actual photon sensing and

conversion. Most of the rest of the substrate is inactive and either covered with a plating or not activated.

Many detector elements can be put on one substrate and used for sensing IR radiation.

1 2 ... 64 65 66 67 68 69 70 71 72 73 74 ... 87 88

Sin comentarios

Wuhan Guide IR136 Manual de usuario Pagina 69