Finding accurate, reliable solutions for Elevated Body Temperature detection | Acal BFi SE

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Acal BFi's technical specialists have proposed application-specific solutions, working with market-leading suppliers such as FLIR, to help quickly specify and supply reliable products for Elevated Body Temperature systems. These products are specifically designed to identify individuals with elevated temperatures, who could potentially have COVID-19.

Although no thermal infrared cameras can detect or diagnose a virus, they have a long history of being used in public spaces, such as airports, train terminals, businesses, factories, and concerts, as an effective tool to measure skin surface temperature and identify individuals with an Elevated Body Temperature (EBT).


To optimise EBT detection, Acal BFi recommends the following field-proven techniques:

How our technical experts and specialist portfolio can help

We recommend the operating procedure specified on ISO/TR 13154:2017, which clearly specifies "The individuals to be screened are channelled into a single file and caused to stop or pause so that the screening thermograph can capture the facial temperature distribution one at a time".

Measuring temperature in the corner of the eye to improve accuracy

EBT screening without physical contact, the most reliable technique is to use an infrared camera to measure the temperature on the hottest part of the face, in the corner of the eye at the tear duct, this is the only part of the face which is truly representative of the individual’s inner-body temperature.

Experts have confirmed that there is a correlation between the eye canthus temperature (tear duct area) and overall body temperature. Measuring this area is a field-proven technique to provide the most accurate indication of the actual body temperature of the screened individual, whatever the environmental temperature conditions.

To apply this technique, we recommend using a thermal infrared camera's which measures the temperature of this small area with at least 9 pixels for accurate results.

Ensure your system provides precise results using a temperature reference blackbody for calibration

If you are using a FLIR high-end thermography camera model (FLIR A320, FLIR A400, FLIR A700) featuring their unique Automatic Temperature Compensator (ATC) that automatically adjusts for ambient conditions to minimise false readings, then the use of a blackbody is not a requirement. You can use the “TEMP-SCREEN” screening mode, which uses a healthy person's face as a temperature reference to measuring the difference. Then, the screening mode provides an alert if any individual's face temperature is more than 2 °C above the reference temperature. Using the TEMP-SCREEN mode rather than a blackbody requires additional maintenance as it is recommended that the reference temperature is updated every 15 min.

If you are using a FLIR camera module (FLIR Tau2, FLIR Lepton), then the use of a blackbody is required for real-time radiometric calibration of the camera. Using a body temperature reference blackbody as part of your system provides more consistent results because after configuration, the blackbody automatically calibrates the system no matter what changes occur to the environmental temperature. We recommend the SBIR Nightingale infrared blackbody temperature which has been recently developed to provide stable, uniform and accurate temperature measurement with IR cameras by Santa Barbara Infrared, a world-leading infrared blackbody manufacturer.

Additional screening using IR forehead thermometers

IR cameras can be used as the first line of EBT detection, however, if the temperature of the skin (especially the corner of the eye and forehead) is above average temperature, then the individual needs further testing. A highly accurate method of further checking an individual’s body temperature is to use an infrared forehead thermometer like the FLIR Extech IR200 Non-Contact Forehead InfraRed Thermometer.

Additional screening using IR forehead thermometers

  •  For OEM’s building their own systems
  • Turnkeys systems for manned security posts with guards

Components for OEMs

When choosing and sourcing products, such as infrared camera cores and infrared blackbodies, to accurately identify EBT ‘Elevated Body Temperature’, each component is key to ensure the overall solution delivers as promised. We have built-up long term partnerships with world leaders FLIR and Santa Barbara Infrared to offer such products.

Our team are here to help support you through your design processes, sourcing high-quality products, solving challenges and making your ideas possible.

Recommended products

FLIR Lepton Family

IR camera core

  • Resolution: 80x60 pixels and 160x120 pixels
  • Radiometric versions available: Lepton 2.5 (80x60) & Lepton 3.5 (160x120)


FLIR TAU2 Family

IR camera core

  • Resolution: 336x256 pixels and 640x512 pixels
  • Radiometric versions available: 336/ 640 TAU2


SBIR Nightingale

Body temperature reference blackbody

  • 30°C to 45°C settable temperature Range
  • 76x76mm Square Emitting Aperture
  • Temperature Accuracy of ±0.15°C

IR solutions for manned security

A key indicator of a virus is elevated body temperature, but people may not be aware they have a fever, however businesses and organisations globally need staff to continue working causing an ongoing risk of spreading the virus. To combat this there has been a rise in demand for tools which can be used by security guards to help with preliminary screening as people enter a building. The IR camera’s chosen for such a system needs to provide reliable results and work easily with other components.

If you need a ready-to-use, accurate solution that can be used by a security guard for EBT screening, our team can recommend some field-proven systems all based on FLIR thermal infrared cameras.

Example of installation

FLIR Boson® FLIR Boson® FLIR Boson®
Step 1:
Individuals are remotely monitored as they pass screening check points set up at an airport, border or in the entrance lobby to a corporation or school
Step 2:
IR camera operator looks at a colour monitor that shows audible and/or visible colour alarms when the individual shows an "out of norm" body temperature
Step 3:
Persons with an elevated body temperature
are sent to a seperate line for further
screening by a healthcare professional or designate.

Recommended products

FLIR A320 Temp-Screen

The most reliable camera system for EBT Detection which has been in global operation for many years.

Key features:

  • Resolution: 320x240 pixels
  • Accuracy: ±2°C or ±2% of reading

New FLIR A400/A7000 Smart Sensor

Outstanding IR cameras with a built-in visible camera that has all the features needed for complex monitoring.

Key features:

  • Resolution: 320x240 pixels
  • Accuracy: ±2°C (±3.6°F) or ±2% of reading

FLIR Extech IR200

Non-Contact Forehead IR Thermometers, for an accurate method of further checking individual body temperature.

Key features:

  • Measures body temperature from 32.0° to 42.5°C
  • Accurate to 0.3° within 0.1°C
  • Adjustable alerts user visually and audibly when temperature exceeds programmed limit
  • Measurement distance: 5 - 15cm

Do you need more information on EBT detection systems?

For more information on our EBT detection systems, or to discuss your project requirements with one of our experts, please get in touch

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