Thermovision applications and camera settings.pdf

Thermovision applications and camera settings.pdf

2. INDEX
1.Principle
2.Important Factors to set in Camera
3.Applications of the thermovisioncamera
4.Drawings and lablesof the FLIR T 530
5.Major Settings and Operations

3. PRINCIPLE
❑Aninfraredcamerameasuresandimagestheemittedinfraredradiation
fromanobject.
❑Radiationisafunctionofobjectsurfacetemperaturemakesitpossible
forthecameratocalculateanddisplaythistemperature.
❑Theradiationmeasuredbythecameradoesnotonlydependonthe
temperatureoftheobjectbutisalsoafunctionoftheemissivity.
Radiationalsooriginatesfromthesurroundingsandisreflectedinthe
object.Theradiationfromtheobjectandthereflectedradiationwillalso
beinfluencedbytheabsorptionoftheatmosphere.

4. Important factors to set in Camera
❑To measure temperature accurately, it is therefore necessary to compensate for
the effects of a number of different radiation sources. This is done on-line
automatically by the camera.
❑The following object parameters must, however, be supplied for the camera:
•Emissivity of the object
•Reflected apparent temperature
•Distance between the object and the camera
•Relative humidity
•Temperature of the atmosphere

5. ❑Emissivity of the object:
•measure of how much radiation is emitted from the object, compared to that
from a perfect blackbody of the same temperature.
•In Substations Emissivity of Aluminium can be used.
❑Reflected apparent temperature :
•This parameter is used to compensate for the radiation reflected in the object
❑Distance between object and the camera:
•The distance is the distance between the object and the front lens of the
camera
•This parameter is used to compensate for the following two facts:
oThat radiation from the target is absorbed by the atmosphere between the
object and the camera.
oThat radiation from the atmosphere itself is detected by the camera.
Important factors to set in Camera

6. ❑Relative humidity:
•transmittance is also dependent on the relative humidity of the atmosphere.
•For short distances and normal humidity the relative humidity can normally be
left at a default value of 50%.
❑Atmospheric Temperature:
•The temperature of the atmosphere between the camera and the target.
Important factors to set in Camera

7. Drawings and lablesof the FLIR T 530

8. Major Settings and Operations
Changing camera lenses
1. Take a firm grip around the inner ring of the lens. Rotate the inner ring 30°counter
clockwise until it stops.
2. Carefully pull out the lens.

9. Drawings and lablesof the FLIR T 530

10. Major Settings and Operations
Adjusting the infrared camera focus:
•It is very important to adjust the focus correctly. Incorrect focus adjustment affects how the
image modes work.
•It also affects the temperature measurement.
•Three types of focus methods
•Manual focus :You can adjust the focus manually by rotating the focus ring.
•Autofocus: You can autofocus the infrared camera by pushing the Autofocus button.
•Continuous autofocus:When the continuous autofocus function is enabled, the camera
bases the focus adjustments on continuous laser distance measurements. The laser is
continuously on.

11. Major Settings and Operations
Manual Focus:
•To adjust the focus manually, rotate the focus ring.
•For far focus, rotate the focus ring clockwise (with the LCD screen facing toward you).
•For near focus, rotate the focus ring counter-clockwise (with the LCD screen facing toward
you).

12. Major Settings and Operations
Autofocusing the infrared camera:
❑When autofocusing, the infrared camera can use one of the following focus methods:
• Contrast: The focus is based on maximizing the image contrast.
• Laser: The focus is based on a laser distance measurement. The laser is used when
the camera is autofocusing.
❑The focus method is configured by a setting. Select (Settings) > Device settings > Focus>Auto
focus and then select Contrast or Laser.
Follow this procedure:
1.To autofocus the infrared camera, push the Autofocus button.
Note: You can also assign the autofocus function to one of the
programmable buttons P.

13. Major Settings and Operations
Continuous autofocus:
•When the continuous autofocus function is enabled, the camera bases the focus adjustments on
continuous laser distance measurements. The laser is continuously on.
•When continuous autofocus is enabled, it is not possible to manually adjust the focus by rotating the
focus ring.

14. Major Settings and Operations
Manual and Automatic Temperature Scale
•In automatic mode, the camera continuously adjusts the level and span for the best image
presentation.
•The temperature scale to the right of the screen shows the upper and lower temperatures of
the current span.
•In manual mode, you can adjust the temperature scale to values close to the temperature of
a specific object in the image. This will make it possible to detect anomalies and smaller
temperature differences in the part of the image of interest.

15. Major Settings and Operations
Changing the camera temperature range
•For accurate temperature measurements, you must change the Camera temperature
range setting to suit the expected temperature of the object you are inspecting.

16. Major Settings and Operations
Changing the colorpalettes
You can change the colorpalette that the camera uses to display different temperatures. A
different palette can make it easier to analyzean image.

17. Major Settings and Operations
Changing the colorpalettes
You can change the colorpalette that the camera uses to display different temperatures. A
different palette can make it easier to analyzean image.

18. Major Settings and Operations
Working with image modes
•The camera can capture both thermal and visual images at the same time
•The camera supports the following image modes:
1.Thermal: An infrared image is displayed.
2.Thermal MSX (Multi Spectral Dynamic Imaging): The camera displays an infrared
image where the edges of the objects are enhanced with visual image details.
3.Picture in picture: An infrared image frame is displayed on top of the visual image.
4.Digital camera: The visual image captured by the digital camera is displayed.
Thermal
Thermal MSX (Multi Spectral
Dynamic Imaging)
Picture in picture
Digital camera

19. Major Settings and Operations
Working with measurement tools
•To measure a temperature, you can use one or more measurement tools, e.g., a spotmeter
or a box.

20. Major Settings and Operations
Adding/removing measurement tools

21. Major Settings and Operations
Moving and resizing a measurement tool

22. Major Settings and Operations
Displaying values in the result table
•For the box and circle tools, you can set the camera to display the maximum, minimum,
average, and area values in the result table.

23. Major Settings and Operations
Displaying values in the result table

24. Major Settings and Operations
Setting a measurement alarm
You can choose between the following alarm types:
• Above: Triggers an alarm when the temperature is above the presetalarm temperature.
• Below: Triggers an alarm when the temperature is below the presetalarm temperature.

25. Major Settings and Operations
Setting a measurement alarm
•Setting up an alarm for a spot

26. Major Settings and Operations
Setting a measurement alarm
•Setting up an alarm for a box or circle

27. Major Settings and Operations
Coloralarms
▪By using coloralarms (isotherms), anomalies can easily be discovered in an infrared image.
▪The isotherm command applies a contrasting colorto all pixels with a temperature
above, below, or between the set temperature levels.
▪You can make the camera trigger the following types of coloralarms:
•Above alarm: This will apply a contrasting colorto all pixels with a temperature above
the specified temperature level.
•Below alarm: This will apply a contrasting colorto all pixels with a temperature below
the specified temperature level.
• Interval alarm: This will apply a contrasting colorto all pixels with a temperature between
two specified temperature levels.

28. Major Settings and Operations
Coloralarms

29. Major Settings and Operations
IntervalAlarm
Coloralarms
Above alarm
BelowAlarm

30. Major Settings and Operations
Coloralarms
▪About the Condensation alarm
•To detect areas with potential moisture problems, you can use the Condensation alarm.
•You can set the relative humidity above which the isotherm will colorize the image.
▪About the Insulation alarm
•The Insulation alarm can detect areas where there may be an insulation deficiency in the
building.
•It will trigger when the insulation level (which is called the thermal index in the camera) falls
below a presetvalue of the energy leakage through a wall.

31. Major Settings and Operations
Coloralarms

32. Major Settings and Operations
Coloralarms

33. Applications of the thermovisioncamera
Substation Scanning
•Can be used to detect loose contacts in the Substation Clamps. To avoid major break
downs.

34. Applications of the thermovisioncamera
Laser distance meter and laser pointer
•The laser distance meter consists of a laser transmitter and a laser receiver.
•The laser distance meter determines the distance to a target by measuring the time it takes
for a laser pulse to reach the target and return to the laser receiver. This time is converted to
a distance, which is displayed on the screen.
❑The laser is enabled by a setting. Select (Settings) > Device settings > Lamp & laser
>Enable lamp & laser.
❑The camera can be configured to automatically measure the distance when an image
is saved. Select (Settings) > Save options & storage > Measure distance.

35. Applications of the thermovisioncamera
Faulty contact in socket
•Local temperature increase can also result from improper contact between wire and socket.
•This temperature increase is caused by the reduced contact area between the connection
point of the incoming wire and the socket , and can result in an electrical fire.
•The image below shows a connection of a cable to a socket where improper contact in the
connection has resulted in local temperature increase.

36. Applications of the thermovisioncamera
•The image below shows extensive water damage on an external wall where the water has
penetrated the outer facing because of an incorrectly installed window ledge.
Moisture and Water Damage
•the damaged area has a different heat conduction property and partly because it has a
different thermal capacity to store heat than the surrounding material.

37. Applications of the thermovisioncamera
Insulation deficiencies
•An infrared camera allows you to see these insulation deficiencies because they either have
a different heat conduction property than sections with correctly installed insulation,
•In the image below, insulation in the roof framing is lacking. Due to the absence of
insulation, air has forced its way into the roof structure, which thus takes on a different
characteristic appearance in the infrared image.