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Thermal imaging & vision systems


close proximity to the person to be scanned. It is vital to select a black body source with a very high stability, as not all black body sources are stable enough to provide a ± 0.5°C system accuracy. The TM-BR20AR-TIM ambient black body


reference source from Micro-Epsilon can be combined with the thermoIMAGER TIM QVGA-HD-T100 camera. The black body is equipped with a 16-bit digital temperature sensor with ± 0.1°C accuracy. By integrating this highly accurate reference signal to the TIM Connect software (freely provided with the camera), Micro-Epsilon can reduce camera uncertainties resulting from device adjustment, ambient temperature drift and short term stability down to a system accuracy of ± 0.5°C with a confidence interval of 95 per cent. “As well as the high resolution of the Micro-


due to environmental and physiological factors that many other systems are susceptible to. The thermoIMAGER TIM QVGA-HD-T100


infrared camera from Micro-Epsilon is supplied with a certificate of calibration that validates temperature measurements made against a traceable 35°C temperature reference source (black body). The camera is accurate to ± 0.5°C when used with the TM-BR20AR-TIM black body source, which means it can provide reliable skin temperature measurements for fever detection systems. It is ideal for integration into automated monitoring systems such as the AFS-100. Absolute temperature measurement accuracy


Most infrared cameras with 8-14µm spectral


response are specified with an accuracy of ± 2°C or 2 per cent of the reading, whichever is greater based on deployments in industrial environments in a wide variety of ambient conditions from 0°C to +50°C. This means that many thermal imagers are unable to achieve the accuracy required to detect a fever and so give false positive readings. Many infrared cameras are being promoted


today that claim to offer accuracies of ± 0.5°C or better. However, these accuracies cannot be achieved without the use of a black body reference source. This source needs to be stable, have high emissivity and should be positioned in


INS-JUL18-LEE DICKENS BRITISH FLAG:Layout 1 21/02/2019 12:09 Page 1


Epsilon camera, the other key benefits for us are its back-end software program that is easy to use and which simplified the set up and configuration of the camera, as well as simplifying the integration of the camera to our own hardware and software systems,” adds Cunningham. “Right from the start and all the way through


product development, the Micro-Epsilon team has been extremely helpful, including demonstrations of the camera, answering our questions and providing technical support, training us on how to use the camera and its software. We look forward to continuing this relationship in the future,” Cunningham concludes.


Micro-Epsilon www.micro-epsilon.co.uk


BRITISH DESIGN, BRITISH MADE BRITISH QUALITY


Instrumentation Monthly November 2020


51


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