Introducing Thermal Technology Alcon 2015

Transcription

1

2 Introducing Thermal Technology Alcon 2015

3 Chapter 1 The basics of thermal imaging technology

4 Basics of thermal imaging technology 1. Thermal Radiation 2. Thermal Radiation propagation 3. Thermal Radiation collection 4. Thermography 101

5 1. Thermal Radiation Thermal radiation In nature, everything above absolute zero (-273 ) emits a steady wave outwards, the temperature dependency of the electromagnetic wave (infrared heat), we call this phenomenon thermal radiation. At different temperatures, the heat radiation emitted by the object is not the same as the wavelength Human thermal radiation Rao iron heat radiation Solar thermal radiation The body, the maximum radiation in range of 37 C at about 9.3μm Rao iron, the maximum radiation occurs at 300 C for about 5.6μm 5500 C in the sun, the maximum of the radiation occurs at about 0.5μm, then the heat radiation performance of the visible light

6 1. Thermal Radiation What is infrared heat? Usually the human eye can perceive electromagnetic wavelengths (visible light) between 400 to 700 nm, a wavelength of infrared illumination is above 850 nm, and a wavelength from 2.0 to 1000 microns portion called thermal infrared. Objects around us only when their temperature up to 1000 or more, to be able to emit visible light. In contrast, the objects around us above absolute zero temperature (-273 ), will constantly emit thermal infrared. Therefore thermal infrared (or thermal radiation) radiation exists the most in nature. Infrared radiation with light and radio waves, is known as an electromagnetic wave.

7 Basics of thermal imaging technology 1. Thermal Radiation 2. Thermal Radiation propagation 3. Thermal Radiation collection 4. Thermography 101

8 2. Thermal Radiation Propagation Thermal infrared radiation is an electromagnetic wave, the electromagnetic wave having all the physical characteristics. When electromagnetic waves passes through the atmosphere, the atmosphere will be reflected, absorbed and scattered, thus making by the attenuation of electromagnetic energy through the atmosphere Less likely to be reflected electromagnetic waves through the atmosphere, absorption and scattering of the high transmittance band that becomes part of the atmospheric window Atmospheric window spectral bands are: microwave band (300-1GHz), thermal infrared band (8-14um), midinfrared (3.5-4um), visible and near-infrared ( um) Infrared light Visible light UV Light Atmosphere

9 2. Thermal Radiation Propagation Depending on the applications of infrared can be divided into four smaller bands: Near-infrared bands: 0.75μm 3μm Mid-infrared band: 3μm 6μm Far-infrared bands: 6μm 15μm A far-infrared bands: 15μm 1000μm Commonly used in current commercial areas thermal imager has 8μm-14μm long-wave. Thermal imager and 3μm-5μ shortwave thermal imager, and some for special applications. Fog Penetration Solar radiation through the atmosphere, not the reflected light absorption and scattering of the radiation wavelength range, but of those of high tra nsmittance called "atmospheric window." There are also in the infrared wavelength band atmospheric window, in the range of 8 to 14μm wavelen gth of the infrared atmospheric transmittance. Solar radiation is able to transmit to Earth, because there are atmospheric windows, with these at mospheric windows, some exposure to the solar radiation falls to the earth, without life on Earth wouldn t exist. This so-called atmospheric windo ws in the solar radiation through the atmosphere, is not reflection, absorption and scattering of those high transmittance band of electromagnetic radiation. Similarly there are also infrared atmospheric windows, 1μm-3μm, 3μm-5μm and 8μm-14μm infrared range stable atmospheric transmitt ance, infrared measurement techniques and therefore these effects are particularly evident band.

10 2. Thermal Radiation Propagation Fog Category: International Civil Aviation Organization (ICAO) Classification Visual distance (MWIR) (LWIR) CatⅠ 1.22Km 3.0~9.8Km 5.9~10.1Km CatⅡ 0.61Km 0.54Km 2.4Km CatⅢa 0.305Km 0.294Km 0.293Km CatⅢc 0.092Km 0.089Km 0.087Km Spectral transmission, CAT 1 fog conditions, compared to the transmission characteristics of the visible spectrum band in the summer and the countryside, suspended particles mid altitudes two thermal infrared windows are significantly lower. When we reduced the visibility in foggy conditions under CAT 2, long-wave infrared (8-12 microns) band is better than visible light, medium wave infrared thermal camera will not see farther than the naked eye. In Cat 3 conditions, visibility is less than 300 m, compared with a thermal imaging camera to see with the naked eye, is not very different.

11 Basics of thermal imaging technology 1. Thermal Radiation 2. Thermal Radiation propagation 3. Thermal Radiation collection 4. Thermography 101

12 3.Thermal Radiation collection 1. Lens has a special material Normal lens Infrared Lens Germanium lens High-purity germanium crystal with a high refractive index, transparent to infrared light, blocking both visible light and ultraviolet.

13 3.Thermal Radiation collection 2. Thermal infrared detectors Thermal infrared thermal imaging camera detector is the heart, the main function is to infrared radiation into an electrical signal, the detector into cooled, uncooled two Cooling type: a photovoltaic detector is based on photon detection, integrated cryogenic coolers for cooling to the detector, so in order to make the thermal noise of the signal is below the imaging signal. Cooled detector excellent image quality, expensive, bulky. Uncooled: micro-bolometer is based on heat detection, there are two kinds of polycrystalline silicon and vanadium oxide detectors Uncooled detector imaging quality is better, relatively low cost, small size.

14 3.Thermal Radiation collection Ordinary cameras capture the visible band (0.4μm-0.76μm), near-infrared (0.76μm-1μm) light Passive infrared thermal imaging camera to capture thermal infrared band (8μm-14μm) light

15 Basics of thermal imaging technology 1. Thermal Radiation 2. Thermal Radiation propagation 3. Thermal Radiation collection 4. Thermography 101

16 4. Thermography 101 Detection mechanism is the use of thermal imaging infrared cameras feature image or the target object and background radiation between different parts of the form to find and identify targets. Infrared detector output image is often referred to as "thermal imaging", because the same object or different objects in different parts of the infrared radiation reflection and their different strength. Using the difference between the object and the background radiation environment, and the difference of each portion of the radiation of the scene itself, can exhibit a thermal image of each part of the scenery radiation fluctuation, which can exhibit the characteristics of the scene. Thermal and visual images of the same object are different, it is not visible to the human eye to see the image, but the surface temperature distribution of the target image is the part will can be made to be visible from the camera sensor.

17 4. Thermography 101 Any object as long as its temperature above absolute zero ( ), although not light, infrared radiation, but can also be called infrared heat radiation. Objects of different temperatures in the infrared radiation is absorbed by the infrared detector, generating a temperature variation, resulting in electric effect, the electrical signal is amplified and then processed, the object is obtained with the surface of the heat distribution corresponding thermal image, that is, "thermal imaging." FPA. Image processing algorithms. Electronic processing circuit. Thermal imaging camera. Temperature measurement and calibration algorithms. Production, Adjustment process and Testing.

18 Chapter 2 Thermal imaging and visible imaging contrast

19 Thermal imaging and visible imaging contrast 1. Section contrast imaging 2. Performance Comparison 3. Effect of contrast

20 Thermal imaging and visible imaging contrast Compared, traditional cameras and thermal imaging cameras 1 contrast imaging modalities Ordinary camera (passive): by collecting the visible scene, thereby generating the image Infrared Camera (Active): With active infrared emission light emitting infrared light through the Central Plains and some light and capture the scene reflected infrared light back, thereby generating an image Thermal imaging cameras (passive): capture probe and the measured infrared radiation emitted by the scene, thereby generating the image

21 Thermal imaging and visible imaging contrast 1. Section contrast imaging 2. Performance Comparison 3. Effect of contrast

22 Thermal imaging and visible imaging contrast Ordinary camera Active infrared cameras Thermal imaging cameras Features Working conditions Passive Dependent on sunlight or lighting Active Dependence of infrared light Passive Is not light sensitive Monitoring distance Monitoring capabilities Hidden performance Temperature display Little monitoring range Monitoring role from the past Focuses on the resolution of the object Subtle performance in general, easier to expose strong light etc. Can not distinguish the target object temperature, influenced by the light Little monitoring range Monitoring role from the past Focuses on the resolution of the object Hidden poor performance, it is easy to expose weakness Can not distinguish the target object temperature, influenced by the light Large monitoring range Monitoring of the distance Focuses on the resolution of the object Good concealment, easy exposure Able to visualize the temperature difference between the surface of the object, without affecting light

23 Thermal imaging and visible imaging contrast 1. Section contrast imaging 2. Performance Comparison 3. Effect of contrast

24 Thermal imaging and visible imaging contrast Outdoor Close up: Ordinary camera Active infrared cameras Thermal imaging cameras

25 Thermal imaging and visible imaging contrast Indoor close view: Ordinary camera Active infrared cameras Thermal imaging cameras

26 Thermal imaging and visible imaging contrast External Wide field effect: Ordinary camera Active infrared cameras Thermal imaging cameras

27 Chapter 3 Thermal imaging Products

28 Thermal Imaging Products 1. Product composition & parameters 2. Product Features 3. Pros & cons of standard products

29 Thermal Imaging Products Thermal network cameras: The main component structure. Germanium metal lens H.264 coding standard Uncooled focal plane detector

30 Main Parameters Uncooled infrared focal plane sensor 8 ~ 14um long wave infrared detection pixels up to pixels Heat sensitivity, up to 50mK Support 8/15/25/35/50 mm focal length, such as fixed focus lens (optional) Support pseudo-color mode switching: Black hot / White Heat / Rainbow / on oxide red Support DVE image enhancement features Support Noise / mirroring Supports H.264 BP / MP / HP / MJPEG optional four coding algorithms and compatibility Real-time 3 yards stream output can meet local storage and network transmission of video 1 channel audio input, 1 channel audio output, two-way voice intercom Support Micro SD (maximum capacity to support 32GB) card local storage, can effectively solve the video lost due to network failure caused the problem. Hardware watchdog, fault auto recovery Metal linkage cooling design Three-axis rotation adjustable bracket for easy installation adjustment

31 Thermal Imaging Products 1. Product composition & parameters 2. Product Features 3. Pros & cons of standard products

32 1. Strong detection capability Characteristics of cameras Applicable under completely dark environment, we can clearly distinguish between different objects, identify camouflaged and concealed targets in the case of zero illumination

33 Characteristics of cameras Applicable to light, backlight, glare and other monitoring scenarios, without interference of light intensity can be achieved effective detection and identification in any scene light intensity.

34 Characteristics of cameras Application of smoke, fog, rain, snow, dust, glare obstructed view of the harsh environments. Suitable for high degree of color confusion, such as the scene camouflage, strong degree of difficulty a true all situation solution.

35 Detection distance Characteristics of cameras Compared with ordinary camera, the thermal imaging cameras have longer detection range Fixed focus lens 8/15/25/35/50 mm (Lens Options at time of ordering) Focus Mode Manual FOV / / / / Aperture 1.0 Recognition distance (body) 60/110/180/250/350M Detection distance greater relationship with the weather

36 Characteristics of cameras Temperature identification function Thermal network cameras at different temperatures by detecting objects at different wavelengths emitted infrared heat radiation, the surface temperature of an object can be identified Cup filled with warm water (McCafé!) Electrical plug is being used

37 Thermal Imaging Products 1. Product composition & parameters 2. Product Features 3. Pros & cons of standard products

38 The Good, the Bad, the Ugly 1 Passive infrared, non-contact, good concealment. 2 All Weather monitoring, can pass through the smoke. Advantage 3 Role distance. 4 Temperature field can display objects. 5 Not affect the light. 1 Poor ability to distinguish details. Shortcoming 2 Transparent impermeable barrier such as glass. 3 Higher than typical camera cost.

39 Chapter 4 1. Showing the best of thermal.

40 Practical applications of thermal imaging cameras Warehouses, factories, prisons, parks and other perimeter Scene features: day night without light or no light, low resolution of complex scenes.

41 Practical applications of thermal imaging cameras Pipelines, electricity hub, border perimeter protection, etc. Scene Features: Monitor range, distance monitoring, for high detection capability.

42 Practical applications of thermal imaging cameras Waterways, coastal, forest defense, port monitoring, surveillance and other airports Scene Features: Low visualization, security requirements monitoring difficult conditions

43 Practical applications of thermal imaging cameras Dessert, oil Fields, Mines, Chemical plants, etc. Scene features: air concentration differences, harsh weather conditions (snow and fog dust)

44 Practical applications of thermal imaging cameras Fire! Fire is often hidden from the obvious fire caused by existing traditional monitoring equipment, hard to find this hidden fire signs Thermal network cameras can quickly and efficiently find these hidden fire areas, and can accurately determine the location and extent of fire, timely control of the situation and eliminate hidden dangers and prevent the occurrence of a large area of fire.

45 Practical applications of thermal imaging cameras Application areas of search and rescue Thermal network cameras on the ability to identify precise temperatures, so that it can quickly and efficiently detect the temperature characteristics of different people in a complex scenario, in health care, life detection, search and rescue.

46 Practical applications of thermal imaging cameras Security, armed police investigation at night; prevent cross-border, drug trafficking and anti-terrorism. Night gives the best criminals and hiding place, according to statistics, 80% of criminal cases are at night. Fighting crime at night, the first to effectively find hidden suspects, criminals likely otherwise slip under the police's nose; If the front-line police officers equipped with advanced infrared night vision equipment, can greatly enhance deterrence against criminals, improve the efficiency of the fight against crime at night, reducing the casualty rate of police officers.

47 Practical applications of thermal imaging cameras Safe city living, aerial vantage. Thermal network cameras for aerial vantage points, can be used to control traffic around the clock to prevent fires, and for other emergencies services.

48 Practical applications of thermal imaging cameras Power line temperature measurement Integrated image, temperature and alarm analysis and other functions in one, substation temperature monitoring system software supporting the use of a composition of reliable performance infrared temperature monitoring system Automatic inspection Set the alarm Point, line, surface temperature dynamics Image

49 Thank You