RayTek ThermoView Ti30 Instrukcja Użytkownika Pobierz pdf (Strona 67)

Imager Reading Error vs Source D:S

The following example uses the above Typical Reading Error vs. Source D/S graph:

A 5" diameter source (Size = 5) at a Distance of 50" has D/S = 50/5 = 10.

According to the above graph the imager would read less than 1% low in

temperature (as shown by the dashed line) for this size target.

Typical Emissivity Values

The following tables provide references for estimating emissivity and can be used when the

user does not have the means or the time to determine the emissivity value experimentally.

Emissivity values shown in the tables are only approximate. Any or all of the following

parameters can affect the emissivity of an object:

1. Temperature

2. Angle of measurement

3. Geometry (plane, concave, convex, etc.)

4. Thickness

5. Surface quality (polished, rough, oxidized, sandblasted)

6. Spectral region of measurement

7. Transmissivity (i.e., thin film plastics)

Note

These tables are to be used as a guide only, as emissivity changes with temperature,

viewing angle, wavelength, target geometry and surface finish.

Note

Your ThermoView Ti30 thermal imager measures infrared energy in the 7 – 14 µm

range.

July 1, 2003 - 67 - Version 1.0

Tel: (01943) 602001- WWW.ISSLTD.CO.UK - Fax: (01943) 816796

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RayTek ThermoView Ti30 Instrukcja Użytkownika Strona 67