Infrared Basics

Question 1

Define Infrared Thermography

Answer 1

IR thermography is the process of acquisition and analysis of thermal information from non-contact thermal imaging devices

Question 2

At what temperature is thermal radiation emitted?

Answer 2

-273.15 Degrees or 0 Kelvin

Question 3

What is the wavelength for Visible Light?

Answer 3

0.4 - 0.7 Nano Meter

Question 4

What is the wavelength for Short Wave?

Answer 4

1.0 - 2.5 Nano Meter

Question 5

What is the wavelength for Mid Wave?

Answer 5

2 -5 Nano Meter

Question 6

What is the wavelength for Long Wave?

Answer 6

8 - 14 Nano Meter

Question 7

What are the types of condition monitoring?

Answer 7

Electrical
Mechanical
Civil

Question 8

What are the types of research and development that Infrared thermography can be used for?

Answer 8

Medical and Veterinary
Quality Control and Process Monitoring
Non-Destructive Testing

Question 9

Name two subtopics within Thermography

Answer 9

Reporting and Routines
Applications
Analysis Techniques
Camera Handling
Radiation Science
Thermal Science

Question 10

Which three wavelength bands are shorter than the visible light band?

Answer 10

Gamma, Ultraviolet, X-ray

Question 11

Which three wavelength bands are longer than the visible light band?

Answer 11

Radio Waves, Microwaves, Ifrared

Question 12

Give an example for the use of Medium Wave Cameras

Answer 12

Gases

Question 13

What are the lenses of thermal cameras made of?

Answer 13

Germanium

Question 14

What IR device gives you temperature data but no image?

Answer 14

Radiation Thermographer

Question 15

Infrared resolution describes the amount of what?

Answer 15

Pixels

Question 16

What 3 things can never be changed once an image is taken?

Answer 16

Focus, The Temperature Range, Distance

Question 17

What do the terms FOV and IFOV describe?

Answer 17

Field of View

Question 18

Why is a calibration required?

Answer 18

To get accurate readings

Question 18

Why is a calibration required?

Answer 18

To get accurate readings

Question 19

What are the main types of heat transfer?

Answer 19

Conduction, Convection, Radiation, Evaporation, Condensation

Question 20

In what type of medium does convection take place?

Answer 20

Liquids or Gases

Question 21

If you double the thickness of a wall, what will happen to the heat transfer through the wall?

Answer 21

The rate of conduction will slow down

Question 22

If you reduce the temperature difference to half, what happens?

Answer 22

The heat loss will decrease

Question 23

What is a thermal gradient?

Answer 23

A gradual change in temperature over distance

Question 24

Which spectral band is situated between radio waves and infrared

Answer 24

Microwaves

Question 25

How does an IR camera work?

Answer 25

Converts invisible IR radiation into a visible image

Question 26

If you want to measure a small object, how can you solve the measurement problem?

Answer 26

Use a lens with a smaller field of view

Question 27

From the list, select a high resolution colour pallet: Iron Grey Scale Medical Rainbow

Answer 27

Rainbow

Question 28

What do we measure when we use the concept of temperature?

Answer 28

The average kinetic energy of the molecules and atoms that make up the substance

Question 29

What is room temperature 26 degrees into Kelvin?

Answer 29

299 Kelvin

Question 30

What is meant by "Conservation of Energy"?

Answer 30

Energy cannot be created or destroyed, only converted from one form to another

Question 31

What is conduction?

Answer 31

The only heat transfer mode that works in opaque (Non-transparent) solids

Question 32

What happens to the conducted heat rate if you double the conductive path length?

Answer 32

The amount of transferred energy will be cut to half

Question 33

Which material has the highest conductivity of the following: Water Steel Brick Aluminium

Answer 33

Aluminium

Question 34

What does an isotherm do?

Answer 34

Marks an interval of apparent temperatures

Question 35

What is a characteristic of a blackbody?

Answer 35

It absorbs all incoming IR radiation

Question 36

What is thermal tuning?

Answer 36

Putting the displayed colours of the camera on the area you want to analyse

Question 37

Apparent temperature is defined as?

Answer 37

An uncompensated reading from an IR camera containing all radiation incident on the instrument, regardless of its sources

Question 38

What is the relationship between the components of exitant radiated energy?

Answer 38

E + P + T = 1 Emissivity + Reflect + Transmit = 1

Question 39

How can the reflection of a person with a temperature higher than the surroundings in the reflection of a window be described?

Answer 39

There is more energy leaving the surface of the glass in the region of reflection

Question 40

A service contractor is doing a survey on industrial plant. What actions are they usually permitted?

Answer 40

Use protective equipment according to the site standard

Question 41

Internal cable problems usually show in the thermal image as?

Answer 41

Local heating in the middle of the cable

Question 42

When performing indoor thermographic surveys, what is the main source of a spot reflection?

Answer 42

The thermographer

Question 43

"Define needs and plans", "Install and train", "Operate and maintain" and "Replace or dispose" are all part of?

Answer 43

The equipment management cycle

Question 44

How many factors effect the emissivity of a target?

Answer 44

6

Question 45

What camera settings compensate for the environment between the IR camera and the target?

Answer 45

Air Temperature, Distance, Humidity

Question 46

What is the name of the law that relates temperature and radiated energy?

Answer 46

Stefan-Boltzmans Law

Question 47

What are the two main components of emitted radiation from an opaque body?

Answer 47

Emitted and reflected radiation