Manual Trotec XC600 (page 30 of 33) (English)

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thermal imaging camera XC300 / XC600

Material Temperature

(°C)

Emissivity

(approximate)

Mica 0.94 – 0.95

Glass 0.91 – 0.92

Level chalk layer 0.88 – 0.93

Epoxy glass plate 0.86

Epoxy hydroxybenzene

plate

0.80

Electric materials

Semiconductor 0.80 – 0.90

Transistor (plastic

sealed)

0.30 – 0.40

Transistor (metal

diode)

0.89 – 0.90

Gold-plated copper

sheet

0.30

Soldered plated

copper

0.35

Zinc-plated lead wire 0.28

Brass wire 0.87 – 0.88

Thermography terms

Span (contrast)

If the temperatures in the image are homogenously distributed

and close together, the image might not be very colourful /

contrasty, and the contours might not be easily visible. To

increase the image's contrast, press the up or down button of

the central menu keyboard. This increases or reduces the

temperature range set. The representation of individual thermal

areas in the image changes and becomes more contrasty.

Level (average temperature / temperature level /

brightness)

When changing the span (see Span), it often makes sense to

also adjust or shift the average temperature (Level). If, for

instance, the span is reduced to a minimum first and then the

level of this extremely narrowed temperature range is shifted

up/down (by pressing the right/left arrow button), the image will

become useless even in parts as it will either have a totally

excessive or insufficient contrast. However, this allows you to

visualize even the smallest temperature differences in the object

when traversing the individual temperature sections.

Emission

Any object whose temperature lies above absolute zero

(-273.15°C) emits heat radiation. Its surface condition (e.g.

colour, structure, material composition etc.) and temperature,

among other things, determine how well the heat is emitted.

The emissivity of an object indicates who much heat it radiates

compared to an ideal black body. An ideal black body has a

theoretical emissivity of 1. Other factors such as transmission

and reflection can be neglected in this ideal case. In practice,

however, this is not possible. Surfaces that strongly reflect in

the visible light spectrum are often also highly reflective in the

infrared spectral range, as is the case with polished aluminium

for instance.

The formula is: transmission + reflection + emission = 1

In most cases, the transmission factor can be neglected. If the

surface to be thermographed is highly reflective, the share of

reflection increases correspondingly and the share of emission

decreases.

Example:

• transmission = 0

• reflection = 0,8

• emission = 0.2

Highly reflective surfaces reflect all temperatures whatsoever

from surrounding heat sources, which are thus indirectly

captured and measured by the thermal imaging camera, while

the surface temperature of the actual measuring object is not

being measured. To overcome this problem, special labels or

sprays with a high defined emissivity are often applied on the

surface to be measured.

The general rule is: The higher the emissivity, the lower the

reflectance, the easier the thermography.

Reflected temperature

The location of heat sources in the surroundings influencing the

measurement and the determination of the average temperature

which is emitted by them and can be reflected by the object to

be thermographed.

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Others manual(s) of Trotec XC600

Trotec XC600 User Manual - German - 33 pages

Trotec XC600 User Manual - Dutch - 32 pages

Trotec XC600 User Manual - French - 33 pages

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Trotec XC600 Manual

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