User's Manual
Table Of Contents
- 1 Disclaimers
- 2 Safety information
- 3 Notice to user
- 4 Customer help
- 5 Quick start guide
- 6 Register the camera
- 7 A note about ergonomics
- 8 Camera parts
- 9 Screen elements
- 10 Navigating the menu system
- 11 Handling the camera
- 11.1 Charging the battery
- 11.2 Installing and removing the camera battery
- 11.3 Turning on and turning off the camera
- 11.4 Adjusting the angle of lens
- 11.5 Adjusting the infrared camera focus manually
- 11.6 Autofocusing the infrared camera
- 11.7 Continuous autofocus
- 11.8 Operating the laser distance meter
- 11.9 Measuring areas
- 11.10 Connecting external devices and storage media
- 11.11 Moving files to a computer
- 11.12 Assigning functions to the programmable buttons
- 11.13 Using the camera lamp as a flash
- 11.14 Changing camera lenses
- 11.15 Neck strap
- 11.16 Hand strap
- 12 Saving and working with images
- 13 Working with the image archive
- 14 Achieving a good image
- 15 Working with image modes
- 16 Working with measurement tools
- 17 Working with color alarms and isotherms
- 18 Annotating images
- 19 Programming the camera (time-lapse)
- 20 Recording video clips
- 21 Screening alarm
- 22 Pairing Bluetooth devices
- 23 Configuring Wi-Fi
- 24 Fetching data from external FLIR meters
- 25 Changing settings
- 26 Cleaning the camera
- 27 Technical data
- 27.1 Online field-of-view calculator
- 27.2 Note about technical data
- 27.3 Note about authoritative versions
- 27.4 FLIR T530 24°
- 27.5 FLIR T530 42°
- 27.6 FLIR T530 24° + 14°
- 27.7 FLIR T530 24° + 42°
- 27.8 FLIR T530 24° + 14° & 42°
- 27.9 FLIR T530 42° + 14°
- 27.10 FLIR T540 24°
- 27.11 FLIR T540 42°
- 27.12 FLIR T540 24° + 14°
- 27.13 FLIR T540 24° + 42°
- 27.14 FLIR T540 24° + 14° & 42°
- 27.15 FLIR T540 42° + 14°
- 28 Mechanical drawings
- 29 Application examples
- 30 About FLIR Systems
- 31 Terms, laws, and definitions
- 32 Thermographic measurement techniques
- 33 The secret to a good thermal image
- 34 About calibration
- 34.1 Introduction
- 34.2 Definition—what is calibration?
- 34.3 Camera calibration at FLIR Systems
- 34.4 The differences between a calibration performed by a user and that performed directly at FLIR Systems
- 34.5 Calibration, verification and adjustment
- 34.6 Non-uniformity correction
- 34.7 Thermal image adjustment (thermal tuning)
- 35 History of infrared technology
- 36 Theory of thermography
- 37 The measurement formula
- 38 Emissivity tables
History of infrared technology
35
Before the year 1800, the existence of the infrared portion of the electromagnetic spec-
trum wasn't even suspected. The original significance of the infrared spectrum, or simply
‘the infrared’ as it is often called, as a form of heat radiation is perhaps less obvious to-
day than it was at the time of its discovery by Herschel in 1800.
Figure 35.1 Sir William Herschel (1738–1822)
The discovery was made accidentally during the search for a new optical material. Sir
William Herschel – Royal Astronomer to King George III of England, and already famous
for his discovery of the planet Uranus – was searching for an optical filter material to re-
duce the brightness of the sun’s image in telescopes during solar observations. While
testing different samples of colored glass which gave similar reductions in brightness he
was intrigued to find that some of the samples passed very little of the sun’s heat, while
others passed so much heat that he risked eye damage after only a few seconds’
observation.
Herschel was soon convinced of the necessity of setting up a systematic experiment,
with the objective of finding a single material that would give the desired reduction in
brightness as well as the maximum reduction in heat. He began the experiment by ac-
tually repeating Newton’s prism experiment, but looking for the heating effect rather than
the visual distribution of intensity in the spectrum. He first blackened the bulb of a sensi-
tive mercury-in-glass thermometer with ink, and with this as his radiation detector he pro-
ceeded to test the heating effect of the various colors of the spectrum formed on the top
of a table by passing sunlight through a glass prism. Other thermometers, placed outside
the sun’s rays, served as controls.
As the blackened thermometer was moved slowly along the colors of the spectrum, the
temperature readings showed a steady increase from the violet end to the red end. This
was not entirely unexpected, since the Italian researcher, Landriani, in a similar experi-
ment in 1777 had observed much the same effect. It was Herschel, however, who was
the first to recognize that there must be a point where the heating effect reaches a maxi-
mum, and that measurements confined to the visible portion of the spectrum failed to lo-
cate this point.
Figure 35.2 Marsilio Landriani (1746–1815)
Moving the thermometer into the dark region beyond the red end of the spectrum, Her-
schel confirmed that the heating continued to increase. The maximum point, when he
found it, lay well beyond the red end – in what is known today as the ‘infrared
wavelengths’.
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