20-09-2016, 02:43 PM
1455381227-TITPPT.pptx (Size: 1.13 MB / Downloads: 6)
INTRODUCTION
Thermal imaging is the technique of using the heat given off by an object to produce an image of it or to locate it
First developed for military purposes in the late 1950s and 1960s by Texas Instruments, Hughes Aircraft and Honeywell
In recent times it is being used in firefighting, law enforcement, industrial applications, security, transportation, medical and many other industries
THERMAL IMAGING
It is the technique of using the heat given off by an object to produce an image of it .
Works in environments without any ambient light and can penetrate obscurants such as smoke, fog and haze.
Normally grey scale in nature: black objects are cold, white objects are hot and the depth of grey indicates variations between the two.
Some thermal cameras, however, add color to images to help users identify objects at different temperatures
THERMAL IMAGING CAMERA (TIC)
A thermal imaging camera records the intensity of radiation in the infrared part of the electromagnetic spectrum and converts it to a visible image.
WORKING OF THERMAL IMAGING CAMERA
A thermal imaging camera consists of five components: an optic system, detector, amplifier, signal processing, and display
COMPONENTS OF THERMAL IMAGING CAMERA
An optic system
Lens
Detector
Cooled Detector
Uncooled Detector
Amplifier
Signal processing
Display
Standard Video Monitor
TYPES OF THERMAL IMAGING CAMERAS
COOLED THERMAL IMAGER
Cooled detectors are typically contained in a vacuum-sealed case and cryogenically cooled
Cooling is necessary for the operation of the semiconductor materials used else they would be blinded by their own radiation
Cooled infrared cameras provide superior image quality
Bulky and expensive to produce and run
Cooling is power-hungry and time-consuming hence the camera needs time to cool down before it can begin working again
UNCOOLED THERMAL IMAGER
Un-cooled detectors use a sensor operating at ambient temperature, or a sensor stabilized at room temperature using control elements
Resolution and image quality tend to be lower than cooled detectors
Smaller and less costly to produce and run
Fast operation and consumes less power