Thermal Scanning Report

Introduction to Infrared Thermography

OBJECTIVES:

To know the basics and fundamentals of Infrared Thermography.

To know the techniques and considerations on Infrared Thermography.

To know the basic operations of the Flir thermal camera including the software

manipulation.

To know the preparation of Infrared Thermography report making analysis.

Fundamentals of Infrared Thermography

INFRARED THERMOGRAPHY

INFRARED THERMOGRAPHY is the science of acquisition and analysis of thermal information from non contact thermal imaging devices.

Disciplines that connotes Thermography

1. Radiation science

2. Thermal science

3. Analysis techniques

4. Camera handling

5. Inspection routines and reporting

6. Applications


SPAN and LEVEL

SPAN is the range of

the temperature.

Thermal contrast

LEVEL is the middle part

of the span. Thermal brightness


Three (3) important aspects that can never be change after storing an

image:

1. Temperature range The appropriate temperature range (-20 to 120, 0 to 350) that is set on the infrared camera.

2. Optical focus Proper focus on an image gives a quality result and accurate data gathering for better analysis of a thermal image.

3. Image composition The distance of the target object gives an overall contribution in analysing an image.


Temperature range


Optical focus


Image composition


Types of heat transfer modes

1. Conduction The direct transfer of thermal energy from molecule to molecule that is caused by collisions between the molecules.

2. Convection This is a heat transfer mode where a fluid is brought into motion, either by gravity or another force, thereby transferring heat from one

place to another.

3. Evaporation/condensation

4. Radiation The transfer of heat by means of emission and absorption of thermal radiation.

Emission Absorption Reflection Transmission


Conduction and radiation


Convection


Factors that effect emissivity

1. Material

2. Surface structure

3. Geometry

4. Angle

5. Wavelength

6. Temperature

Getting to know the Flir T250 device


Electronic zoom

Visual/IR/fusion image

toggle

Navigator mini joy stick

Power button

Recall button

Global set up button

Info button

Tools setting button

Display screen (touch screen)

Auto/Manual toggle


Screen stylus

Laser button

Save button

Auto/manual

focus toggle

SD card slot Lens cover

Laser diode

Germanium lens

LED lamp

Camera strap USB connector slot

Infrared Thermography report format

Date: March 24, 2012 Hot spot temp: deg. Celsius

Location: Perimeter area Reference temp: 38 deg Celsius

Equipment: MERALCO post cut out fuse Temp diff.: deg. Celsius

Hot spot component: None L1= L2= L3=

Probable root cause: N/A

Recommendation: N/A

INFRARED THERMOGRAPHYExample of Flir Quick report software

Tips during IR thermal scanning

INFRARED THERMOGRAPHYTips during IR thermal scanning:

1. Always check the settings of the device before conducting an inspection.

2. Bring the necessary tools upon inspection (clamp meter, clip board, pencil, leather gloves).

3. Protect and avoid cleaning the lens to prevent scratch on the surface of the lens (scratch lens will give inaccurate reading).

4. Must able to distinguish a hot spot vs. a heat reflection from a source.

5. Must able to have the proper viewing angle on the target object.

6. Keep a safe distance to avoid any electrical accidents (approx. 1 meter as much as possible).

7. Do not conduct scanning during heavy winds or in rainy conditions.

8. Develop a quality and quantitative analysis approach.


Reflection or Hot spot?

Answer: Reflection


Whats your analysis? The generator is running for 2 hours and the area outside the office is warm. Will the camera see the radiation emitting from

the genset?


Reference:

Cronholm, Mikael (2001). Infrared Thermography Level 1 Course Manual.

Infrared Training Center, Sweden.

Thank You!

Documents

Thermal Scanning Report