P1 - Reducing the measurement uncertainty of shutter-less microbolometer-based infrared measurement systems
- AMA Conferences 2015
2015-05-19 - 2015-05-21
- Proceedings IRS² 2015
- IP - Poster Session
- A. Tempelhahn, H. Budzier, V. Krause, G. Gerlach - Technische Universität Dresden (Germany)
- 961 - 966
Shutterless infrared cameras based on microbolometer focal plane arrays (FPAs) are the most widely used cameras in thermography, in particular in the fields of handheld devices and small distributed sensors. For acceptable measurement uncertainty values the disturbing influences of changing thermal ambient conditions have to be treated corresponding to temperature measurements of the thermal conditions inside the camera. We propose a compensation approach based on calibration measurements where changing external conditions are simulated and all correction parameters are determined. This allows to process the raw infrared data and to consider all disturbing influences. The effects on the pixel responsivity and offset voltage are considered separately. The responsivity correction requires two different, alternating radiation sources. This paper presents the details of the compensation procedure and discusses relevant aspects to gain low temperature measurement uncertainty.