EasyManuals Logo

FLIR T530 User Manual

FLIR T530
248 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #223 background imageLoading...
Page #223 background image
Theory of thermography
36
36.3 Blackbody radiation
A blackbody is defined as an object which absorbs all radiation that impinges on it at any
wavelength. The apparent misnomer black relating to an object emitting radiation is ex-
plained by Kirchhoffs Law (after Gustav Robert Kirchhoff, 1824–1887), which states that a
body capable of absorbing all radiation at any wavelength is equally capable in the emis-
sion of radiation.
Figure 36.2 Gustav Robert Kirchhoff (1824–1887)
The construction of a blackbody source is, in principle, very simple. The radiation charac-
teristics of an aperture in an isotherm cavity made of an opaque absorbing material repre-
sents almost exactly the properties of a blackbody. A practical application of the principle
to the construction of a perfect absorber of radiation consists of a box that is light tight ex-
cept for an aperture in one of the sides. Any radiation which then enters the hole is scat-
tered and absorbed by repeated reflections so only an infinitesimal fraction can possibly
escape. The blackness which is obtained at the aperture is nearly equal to a blackbody
and almost perfect for all wavelengths.
By providing such an isothermal cavity with a suitable heater it becomes what is termed a
cavity radiator. An isothermal cavity heated to a uniform temperature generates blackbody
radiation, the characteristics of which are determined solely by the temperature of the cav-
ity. Such cavity radiators are commonly used as sources of radiation in temperature refer-
ence standards in the laboratory for calibrating thermographic instruments, such as a
FLIR Systems camera for example.
If the temperature of blackbody radiation increases to more than 525°C (977°F), the
source begins to be visible so that it appears to the eye no longer black. This is the incipi-
ent red heat temperature of the radiator, which then becomes orange or yellow as the tem-
perature increases further. In fact, the definition of the so-called color temperature of an
object is the temperature to which a blackbody would have to be heated to have the same
appearance.
Now consider three expressions that describe the radiation emitted from a blackbody.
#T810253; r. AA/42549/42549; en-US
211

Table of Contents

Other manuals for FLIR T530

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the FLIR T530 and is the answer not in the manual?

FLIR T530 Specifications

General IconGeneral
Resolution320 x 240 pixels
Thermal Sensitivity< 30 mK
Digital Zoom1-4x continuous
Image ModesThermal, MSX, Picture-in-Picture
StorageSD card
Image Frequency30 Hz
Accuracy±2°C or ±2% of reading
Digital Camera5 MP
Laser Distance MeterYes
Wi-FiYes
Video RecordingYes
Video OutputHDMI
Minimum Focus Distance0.15 m (0.49 ft)
Operating Temperature Range-15°C to 50°C (5°F to 122°F)
Storage Temperature Range-40°C to 70°C (-40°F to 158°F)
Temperature Range0°C to +650°C
Field of View24° × 18°
Display4-inch LCD touchscreen
Battery LifeApprox. 4 hours
FocusContinuous, one-shot contrast, manual
Spectral Range7.5-14 µm
Weight1.3 kg (2.9 lbs)
ConnectivityWi-Fi, USB
Lens Options14°, 24°, 42°

Related product manuals