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IR Based Fever Detection

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Major travel hubs like airports, seaports, railway stations and long-distance bus stations are one of the points on which the security measures of public authorities are aimed when infectious diseases such as Coronavirus (2019-nCoV), Severe Acute Respiratory Syndrome (SARS), Ebola Virus Disease (EVD) or Middle East Respiratory Syndrome Coro-navirus (MERS-CoV) cause global problems. From there, diseases can be effectively prevented from spreading further. InfraTec infrared cameras can be used for a corresponding thermal fever screening for passengers. Our thermographic systems enable a non-contact and areal coverage of the body temperature, which preferably is detected at the inner angle of the eye. Slightest differences and thus abnormal body tempera- tures can be displayed and will result in alarms. Performing such health screenings, e.g. via implementing temperature checkpoints, enable the acquisition of important informa- tion as a basis for decision-making for subsequent medical examinations of the selected people and thus serve to secure public areas.

Advantages of using infrared cameras for thermal fever scanning of passengers

  • Contactless and planar temperature measurement without external reference radiator
  • Large field of view for rapid checking of large groups of people
  • Resolution also of smaller areas of the skin (angle of the eye) from a safe distance
  • Display and evaluation in real time
  • Reliable temperature measurements based on low noise infrared detectors and precision calibration
  • Alarming at surpassing temperature thresholds (fever)
  • Easily installable all-in-one unit for continuous monitoring of persons and groups of people
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Simultaneous Mapping of Wide Temperature Ranges

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If you want to measure temperatures in a very wide range with an infrared camera, you normally do this in stages. The neutral density filters are changed gradually from time to time. Adjusted to a specific temperature range, they prevent high-intensity infrared radiation from striking the camera detector and falsifying the measurement result by depolarising the detector pixels. The new High Dynamic Range (HDR) function of the Infrared ImageIR® camera series from InfraTec eliminates the need for such interruptions. It enables measurement scenarios with extremely different temperatures to be recorded continuously.

Capture temperature ranges of over 1,500 K in one image thanks to six positions
The starting point of the HDR function is a fast rotating filter wheel. Designed for such tasks, it rotates at more than 5,000 revolutions per minute. The wheel provides up to six positions ensuring maximum flexibility for demanding measurement tasks. When recording in HDR mode, multiple thermograms with different integration times and different filters are recorded quickly in succession and compiled into an overall image with a high dynamic range.

To activate the HDR function, it is sufficient to select a previously defined calibration range. After that, the rotation of the rotating filter wheel and the composition of the thermogram starts automatically. The measuring range can span up to 1,500 K. In the case of the ImageIR® 8300 hp, this setting can be used to capture full-frame images with (640 × 512) IR pixels. Based on the frame rate synchronization of the camera with the rotational speed of the wheel, it is possible to achieve a temporal resolution of 350 Hz.

Each position of the individual neutral density filters has its own integration time and corresponding temperature calibration. The filters weaken the signal of the measurement objects within the desired temperature range, which reliably prevents interference effects. Users obtain high-contrast images in a wide temperature range characterized by high measurement accuracy.

Solution for measurement tasks with high object temperatures and spectral thermography
The tremendous benefits that come with it become clear as soon as users thermally analyse measurement objects that experience temperature changes over a very wide range within a very short time. The necessary changing of filters with a standard rotating filter wheel would interrupt the measurement for several seconds, rendering the results unusable. The HDR function makes it possible to quickly switch between calibration ranges up to the maximum camera frequency.

In addition to extremely high temperature applications, the fast rotating filter wheel offers a wide range of measurement options, in which different spectral ranges need to be measured. Finally, users can also use up to six spectral filters instead of neutral density filters. Equipped in this way, the ImageIR® infrared camera series supports the professional examination of materials with different radiation properties. Regardless of which components users choose for their desired model, the camera can always be used with a fixed rotating filter wheel.

 

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Back Illumination High Speed Imaging

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Back illuminated imaging is a widely used imaging technique. Under the correct conditions it can provide high contrast images of object’s. This is particularly important if you are interested in an objects’ shape or size.

The idea is a simple one – a light is shone towards the camera creating a white image, the subject is then passed between the light source and the camera thus blocking the light path and creating a dark area on the image. If the subject is stationary you can focus your camera onto the objects’ profile and obtain a sharp outline. If the subject is moving, in order to freeze the motion (remove blur) and obtain a crisp outline you will need to have a sufficiently fast shutter (short exposure time).

In extreme cases a strobe light source such as a pulsed laser or LED can be used. (For more detail on lasers please see our laser range.) Using this technique you will not be able to obtain 3D information about the object shape. If you wish to resolve features on the object surface you can use a combination of front and back lighting. The technique is not limited to solids, it can equally be applied to fluids, multi-phase flows, in fact any subject that will completely or partially block the path of light to the imaging sensor.

Optical Set up: The best results are obtained with a diffuse light source. This can be achieved by passing the light through a light diffusing medium such as a ground glass or opal diffuser plate, alternatively as a low cost solution opaque drawing film works very well. Where it is not possible to position the light behind the subject you can reflect it back to the camera using a white background

Uses

  • 1.  Spray analysis
  • 2.  Droplet impaction / coalescence
  • 3.  Particle size and shape
  • 4.  Bubble formation and growth
  • 5.  Ballistics
  • 6.  Welding

Analysis of Thermal Conductivity

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Lock-in Thermography with Infrared Camera VarioCAM® HD research 800 (exact model not available in Australia)

New materials with precisely controlled optical and thermal transport characteristics can make a large contribution to resource-saving thermal management. Scientists of the University of Bayreuth are pursuing this vision. They use infrared thermography to quantitatively determine thermal conductivity in nano- and mesostructured polymer materials.

Thermal conduction and thermal radiation are essential transport mechanisms that play a key role in various applications, from the smallest microchips to complete buildings. Their control requires a sophisticated material design that reaches into the nanometre range. Prof. Markus Retsch and his team from the Chair for Physical Chemistry 1 of the University of Bayreuth are working on the development and characterisation of such innovative materials. Modern cooling and air conditioning systems still require an external energy supply. But the cooling technology of the future should work without additional energy. To achieve this, materials are needed that selectively radiate heat. This can take place, for example, in clear weather when radiation occurs into very cold outer space through the so-called “Sky Window” in the long-wave spectral range of 8 … 13 µm, in which the atmosphere is transparent. “This process is called passive cooling,” explains Prof. Retsch, “and requires materials that emit heat via thermal radiation within a selective spectral range. At the same time as little solar energy as possible should be absorbed from the sun, for instance by improving the reflection or scattering properties of the material.”

Thin Samples Actively Excited by a Laser

On the path to such passive cooling materials, understanding of the thermal conductivity process is important. To do this, Prof. Retsch’s group is working with free-standing samples of, for example, thin polymer foils, 3D-prints, and fibre mats with a film thickness of only a few hundred micrometres. These samples are investigated with the goal of determining their direction-dependent thermal diffusivity. With this value and including the specific heat capacity and density of the sample, the corresponding thermal conductivity is calculated.

As part of the analysis, the measurement objects are excited by an intensity-modulated laser. Depending on the characteristics of the sample, the heat flux extends differently into the material (see fig. 1). The scientists actively control the entire measurement through the thermography software IRBIS® 3. The infrared camera that they use, VarioCAM® HD research 800 from InfraTec, detects the emitted infrared radiation, whose intensity varies with the lock-in modulation frequency.

High Speed Camera Rental Australia

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A rejuvenated red Kookaburra ball has been introduced for the final two round of Austrlia’s state cricket league before the KFC Big Bash break will feature a subtly different ball which has been subject to ongoing testing and tinkering by Kookaburra in recent years.

The testing, carried out at Kookaburra’s facility in Melbourne, utilised a number of different techniques including the Photron AX200 32GB camera to film compression and impact of the ball. The camera was only needed for a short time during the testing period so a short term rental was organised along with some basic remote training and trouble shooting. The below video and outcome of the trials show just how easy the Photron PFV software and camera is to use.

 

 

Full article: https://www.cricket.com.au/news/new-kookaburra-ball-to-be-trialled-in-next-two-rounds-of-marsh-sheffield-shield-cricket-australia/2019-11-27

Thermal Imaging in Vet Science

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Medical examinations of animals can be carried out in an efficient way by applying infrared camera systems. Animal’s body temperature can indicate multiple health problems. These may affect the animal itself, as for instance diseases of the udder or hoof, or they result from animal husbandry, as it is in the case of an incorrect application of saddles causing pressure points and, following, local overheating on horses. Inflammations and lameness are further problems which can be detected with the help of thermography.

The Infratec range of cameras are well equipped to handle the demands for high thermal resolution to give precise measurements that other brands are not able to provide. One such application can be seen in the research article on Evaluation of thermal pattern distributions in racehorse saddles using infrared thermography.

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Low Light High Speed Camera Test

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The conditions were anything but perfect at AOS’s outdoor crash day for their big insurance company client. The sun was hiding behind a heavily overcast sky, sub-optimal for high speed camera recordings – but not for the M-VIT! The new sensor with 1280 x 800 and up to 4000 frames/sec offers a perfect image without motion blur even under challenging lighting conditions.

M-VIT 1280×800 @ 2000 from AOS Technologies AG on Vimeo.

Photron Polarisation Cameras

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Introducing the world’s fastest 2D polarisation camera, at over 1 million frames per second!

Key Uses include:

  • Analysis and visualisation of internal stress distribution during metal processing
  • Evaluation of stress propagation around cracks due to impact fracture
  • Dynamic observation of crystal axis/orientation state on liquid crystal/crystal material
  • Visualisation of fluid stress distribution generated by viscoelastic body or soft matter

Polarisation can measure and visualise various physical quantities and properties

Polarised light cannot be recognised visually but is light where “light waves oscillate in a single plane”. Since the polarisation state of light varies depending on the internal structure of the transmission object and the surface shape of the reflected object, it can be applies to measure various physical qualities and visualise phenomena by obtaining the polarisation state before entering and after exiting the object. By combining this “polarisation information” with the conventional high-speed camera images, it is possible to study the load applied to a cutting tool at the same time as analysing the stresses inherent in the transparent material in the images, and understand the stress propagation and relaxation processes in impact test and flow phenomenon.This enables us to visualise events that cannot be seen by conventional means, qualitatively measuring the uniformity of the spatial performance of the alignment film in a non-contact manner.

 

 

*All information provided by Photron USA