THERMOGRAPHY

THERMOGRAPHY

ABSTRACT

Thermography is a non-contact, non-destructive test method that utilizes a thermal image to detect, display and record thermal patterns and temperatures across the surface of an object. Thermography is widely used in industry for predictive maintenance, quality assurance and forensic investigations of electrical, mechanical and structural systems. Other applications include, tank and concrete inspection, nondestructive testing, condition monitoring, night vision and medical and veterinary sciences.

Thermography is useful because:

1. It is non-contact
–Uses remote sensing
–Keeps the user out of danger
2. It is two dimensional
- Thermal patterns can be visualized for analysis
-Comparison between areas of the target is possible
3. It is real time
- Enables very fast scanning of stationary targets
- Enables capture of fast moving targets
- Enables capture of fast changing thermal patterns.

Thermal infrared imagers convert the energy in the infrared wavelength into a visible light video display. All objects above 0 Kelvin emit thermal infrared energy. The radiation from the object makes it possible for a thermal camera to display an object’s temperature.

INTRODUCTION

About the Thermography

Thermal or infrared energy is an energy, not visible because its wavelength is too long for the sensors in our eyes to detect. It is the part of the electromagnetic spectrum that we perceive as heat. Unlike visible light, in the infrared spectrum, everything with a temperature above absolute zero emits infrared electromagnetic energy. Even cold objects such as ice cubes, emit infrared radiation. The higher the temperature of the object, the greater the infrared radiation emitted. The Infrared camera allows us to see what our eyes cannot.

All objects, cold or hot, radiate heat in the form of infrared energy. As an object increases in temperature, it radiates more energy, and the wavelength gets shorter. Infrared radiation, visible light and ultraviolet light are all forms of energy in the electromagnetic spectrum. The only difference is their wavelength or frequency.

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