Thermal Imaging

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WELCOME TO ALL :

WELCOME TO ALL

THERMAL INFRARED IMAGE TECHNOLOGY:

THERMAL INFRARED IMAGE TECHNOLOGY PRESENTED BY V.Muni priya

CONTENTS:

CONTENTS Introduction Thermal image light categories Types of thermal imaging devices Differences of thermal devices Applications Thermal image system How to work thermal imaging Advantages disadvantages

INTRODUCTION:

INTRODUCTION The foundation for the modern thermal imaging system was developed in the early 1800’s by” sir john herchel”. Herchel,who was interested in photography,managed to record the infrared spectrum through a number of exprimentations with carbon and alcohol. This paper will first look at the historical maintenance perspective where infrared may play a part. Through no means of measurement were available,the concept of temperature measurement was established.

THERMAL IMAGE LIGHT SPLITED INTO 3 CATEGORIES :

THERMAL IMAGE LIGHT SPLITED INTO 3 CATEGORIES Near-infrared (near-IR) Mid-infrared (mid-IR) Thermal-infrared (thermal-IR)

TYPES OF THERMAL IMAGING DEVICES :

TYPES OF THERMAL IMAGING DEVICES UN-COOLED INFRARED DEVICE COOLED INFRARED DEVICE

DIFFERENCES OF THERMAL DEVICES:

DIFFERENCES OF THERMAL DEVICES Uncooled infrared device Cooled infrared device Use a sensor operating at temperature. Cooling is not necessary. They are smaller & less costly. Materials used for uncooled infrared detection are, vanadium Lanthanum silicon Use sensors with operating range from 4k to below room temperature. The cooling is necessary. Use sensors that work by catching IR radiations. Materials used for cooled infrared detection are, lead sulfide lead selenide

APPLICATIONS:

APPLICATIONS Condition monitoring. Digital infrared thermal imaging in health care. Thermology. Veterinary thermal imaging. Night vision. Research. Process control.

CONTD……:

CONTD…… Surveillance in security,law enforcement Chemical imaging. Volcanology. Building. Nondestructive testing.

THERMAL IMAGE SYSTEM:

THERMAL IMAGE SYSTEM

10 USES FOR THERMAL IMAGING:

10 USES FOR THERMAL IMAGING Fugitive searches Officer safety Surveillance activities Hidden compartments Accident investigation Search & rescue Disturbed surfaces Marine patral Locating evidence

FUGITIVE SEARCHES:

FUGITIVE SEARCHES Thermal imagers provide law enforcement officers with a unique solution for the most common problems created when officers use flashlights to search for a hidden suspect. Dark or camouflaged clothing worn by a suspect can make it very difficult for officers to use light or night vision technology to distinguish him from his surroundings.

OFFICER SAFETY:

OFFICER SAFETY When officers are approaching an unknown scene, safety is a primary consideration. With a thermal imager, an officer can stop and scan the property at a distance, identifying anyone who might be waiting outside of the residence, as well as any dogs or animals that may increase the risk involved with walking onto the property.

SURVEILLANCE ACTIVITIES:

SURVEILLANCE ACTIVITIES Savvy criminals who know standard surveillance techniques may conceal their business by using tactics that disable light-sensing technologies. For example, drug dealers have been know to park their cars in a semi-circle, turn on the headlights and ply their trade behind the protective cover of light.

HIDDEN COMPARTMENTS:

HIDDEN COMPARTMENTS There is a common misconception that thermal imagers can see through objects such as walls. When scanning a wall made of drywall, for example, a TI operator will be able to identify studs because the temperature of the drywall where it is in contact with the stud is different, not because the TI is seeing through the wall.

ACCIDENT INVESTIGATION:

ACCIDENT INVESTIGATION Traffic re-constructionists seeking to determine speed at impact often begin by measuring skid marks. Modern cars, equipped with anti-lock braking systems, are designed to not leave such marks, which makes it difficult if not impossible to collect this measurement on scene.

SEARCH & RESCUE:

SEARCH & RESCUE While in many regions, the fire department is the lead agency in searches, the reality is that police officers are often dispatched to assist. Whether the missing person is a roaming child or an elderly Alzheimer’s patient, a thermal imager can help officers search large areas in short order.

DISTURBED SURFACES:

DISTURBED SURFACES Every material absorbs heat and releases heat in a specific manner. Altering the material potentially changes its thermal signature, giving the thermal imager an opportunity to detect the location of any changes. Drywall that has been repaired or repainted to cover evidence will have a different thermal signature than the rest of the wall.

MARINE PATROL:

MARINE PATROL As noted in the Search and Rescue section above, water is normally cooler than a person; therefore, a person floating on or swimming in the water appears warm and is easily visible with a thermal imager. Floating evidence, swimmers, skiers, land masses and other watercraft are all plainly visible on a TI. Thermal imagers are generally unaffected by fog, smoke or mist common in some maritime applications. A thermal imager can be used for surveillance, navigation, watercraft enforcement or search and rescue operations.

LOCATING EVIDENCE:

LOCATING EVIDENCE Weapons and drugs tossed by a fleeing suspect, or even casually dropped as an officer approaches, will generally yield a latent thermal image. Officers with thermal imagers can scan the immediate area around the suspect, or the path of pursuit, to locate potential evidence.

TACTICAL TEAMS:

TACTICAL TEAMS While the military has used thermal imaging for decades, the technology is still relatively new to the law enforcement community as a whole. Tactical teams are among the few specialty areas in law enforcement that have been aggressive early adopters.

DIFFERENT TYPES OF THERMAL CAMERAS:

DIFFERENT TYPES OF THERMAL CAMERAS

INFORMATION ABOUT THERMAL CAMERAS:

INFORMATION ABOUT THERMAL CAMERAS A day and night, color network camera delivers color images during the day. Near-infrared light, which spans from 700 nanometers (nm) up to about 1000 nm, is beyond what the human eye can see, but most camera sensors can detect it and make use of it. When the camera is in night (black and white) mode, the IR-cut filter is removed, allowing the camera’s light sensitivity to reach down to 0.001 lux or lower. Instead of the 450–750 nanometer range of the visible light camera, infrared cameras operate in wavelengths as long as 14,000 nm (14 µm).

CONTD….:

CONTD…. Infrared energy is just one part of the electromagnetic spectrum that encompasses radiation from gamma rays, x-rays, ultra violet, a thin region of visible light, infrared, terahertz waves, microwaves, and radio waves. Their resolution is considerably lower than of optical cameras, mostly only 160x120 or 320x240 pixels.

ADVANTAGES:

ADVANTAGES It shows a visual picture. It’s capable of catching moving target in real time. It’s able to find deteriorating. It can be used to measure or observe in areas inaccessible or hazardous for other methods. It is a non-destructive test method. It can be used to find defects. It can be used to detect object in dark areas.

DISADVANTAGES:

DISADVANTAGES High price range. Image can be difficult to interpret accurately when based upon certain objects. Accurate temperature measurements are hindered by differing emissivities & reflections from other surfaces. Most cameras have+ or -2% accuracy or worse. Only able to directly detect surface temperatures.

CONCLUSION:

CONCLUSION Thermal imaging technology provides the ability to see and target opposing forces through the dark of night or across a smoke-covered battleground. The properties that have made infrared detection valuable to military services around the world also make it valuable to fire services and law enforcement.

THANK YOU:

THANK YOU

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