Frequently Asked Questions

We know that there are a lot of things you might want to know about our company, products, and services. Our FAQs page is designed to answer simple questions you might have without needing to email or call our customer service representative. That way, you can save time and effort. In case your question is not included in our FAQs list, feel free to message us.

We have separated the frequently asked questions into three categories to help you find your query faster.

FAQs About Thermal Scanners

Thermal cameras detect heat radiation and can be used to identify the surface temperature of objects and people. With this capability, thermal cameras are commonly used as a non-contact screening tool to detect differences in skin surface temperatures and pattern changes.

Thermal imaging cameras have lenses, just like visible light cameras. But in this case the lens focuses waves from the infrared energy present in all objects onto an infrared sensor array. Thousands of sensors on the array convert the infrared energy into electrical signals, which create a video image. The infrared camera measures and displays a “thermal profile” of objects in relation to the temperature of surrounding objects. So a person, warmer than the surrounding air, appears “white” while the cooler surrounding air or buildings will appear in varying shades of gray.

Yes but not all thermal cameras are specifically designed to be excellent in the job, as some thermal scanners are designed to detect a gas leak and heat for building maintenance and night time security. Thermal scanners for maintenance and night time security may be able to detect elevated skin temperature but they are not designed to detect fever efficiently, that is why manufacturers like FLIR, Dahua Technology, and Hikvision have to create a totally different type of thermal cameras to serve the fever-detection purpose during the pandemic.

No, thermal cameras cannot detect COVID-19 nor any infection. What our thermal cameras can detect is fever manifesting through elevated skin temperature, as fever is confirmed to be one of the most common symptoms of COVID-19. Out thermal cameras cannot detect the presence of the virus itself. Additionally, asymptomatic COVID-19 carriers do not show signs of fever.

Most thermal cameras “see” or detect the temperature differences with temperature measurements between -20°C and 2,000°C (-4°F to 3,632°F). The standard thermal camera accuracy specification of ±2°C or 2% of the temperature reading at 30°C (86°F) ambient environment applies to all temperature ranges it measures and for the multiple applications for which it can be used. It’s important to note there are many factors that can affect the accuracy of thermal cameras, such as focus, distance, the emissivity* of the target, the ambient environment, and the speed at which the temperatures are acquired.

No. However, if a person had a gun under their shirt, its exterior area would appear “cooler” to the camera and indicate to police that someone may be carrying a gun.

No. These cameras only “see” heat as it radiates off of an object. It may “see” the heat coming from a house, but it can’t see into the house because the camera picks up the house’s exterior thermal image first. In fact, the thermal imaging doesn’t even see-through glass because the glass has its own thermal profile. Thermal imaging has also been used to improve energy conservation. Infrared systems have been used for years to monitor homes for heat loss to spot gaps in insulation.

FAQs About Thermal Scanner Usage

ASI Thermal recommends that thermal camera operators obtain at a minimum Level 1 thermal imaging certification through certified thermography courses such as the Infrared Training Center. This is not a medical training or medical certification, but it provides a baseline understanding of thermography. The Infrared Training Center offers more advanced training.

Non-contact thermometers are primarily used in a handheld fashion to screen a person’s forehead. The operator points the non-contact device at the subject from a recommended distance of 5 cm to 15 cm (1.9 inches to 5.9 inches); thermometers can usually measure temperatures from 32°C to 42.5°C (89.6°F to 108.5°F).

It is important that the application is set up so that all intended targets are in focus during the screening process, thereby creating a good image. The location of the camera may require a different lens. For instance, if the operator wanted to place the camera at a significant distance, ASI Thermal might recommend telephoto lenses. Therefore, distance to the target is an important consideration, as is the focus.

The U.S. Food and Drug Administration (FDA) provides full recommendations for Thermal Imaging Systems (Infrared Thermographic Systems / Thermal Imaging Cameras). Here are several tips to ensure optimal measurement performance from a FLIR thermal camera:

  • Screen people, one at a time to look for temperature anomalies.
  • Screen people from 1 to 2 meters (3 to 6 feet) away.
  • Measure temperature near the tear duct (at the inner canthus) as this location provides the closest temperature correlation to human core body temperature. This is not measuring core body temperature and readings near 35°C (95°F) are common.
  • Perform secondary screening on individuals with elevated skin temperature using a medical device designed specifically for measuring body temperature, such as a thermometer.

You can safely scan about 2-3 people across, as long as you can see a good part of their face. One person cannot completely block another. People do not need to stop at the camera, they can just walk through at a slower pace (not rush past), so you could easily screen over 60 to 80 people per minute.

The device comes with a high-end camera stand. It can also be mounted. Best mounting height is about 5 1/2 feet high so as to capture the majority of the face relatively direct on and to be able to span and catch all faces as they walk past from very short to very tall people. There are 3 predrilled screw holes in the bottom of the camera assembly that can be used for a custom mounting.

Facial temperatures are affected by ambient temperature and thus outdoor use in more extreme temperatures can generate incorrect readings.  This is because all thermal cameras are simply measuring the facial skin temperature and a very hot or very cold day can alter surface temps of people being scanned.

There are advantages and disadvantages to using a black body when screening for elevated skin temperatures. Including a black body in the camera’s field of view can improve the system’s performance in this application. You can use thermal cameras with black bodies as part of an elevated skin temperature system setup. In fact, as an integrator, ASI Thermal is doing just that, taking thermal camera manufacturers’ technology and developing their own solution that uses a black body as the reference.

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