Abstract
An infrared (IR) temperature measurement system consists of not only a
sensor module and electronics, but also an optomechanical system that guides
IR radiation onto the sensor. The geometry and emissivity of the parts affects
the reading, if the detector sees not only the target but parts of the
measuring system itself. In normal industrial applications, the optics is
designed so that the surfaces stabilize to the same temperature as the sensor.
This allows the error caused by the device temperature to be easily
calibrated away. The correction is valid for stationary conditions and usually
near the calibration temperature, which is typically at room temperature.
However, we show that if the sensor is embedded into a mobile (hand-held)
device which has heat sources, such as power electronics, the normal
conditions are no longer valid and the calibration fails. In order to improve
infrared temperature sensing for mobile devices, the optics concept was
studied and detailed design was performed. In addition, the optics performance
was modelled and verified by measurement sensor prototyping. A calibration
procedure noticing operational temperature variations was applied. The
repeatability of the implemented IR temperature sensor using on a correct
transferred calibration curve was better than ±0.5 °C in an operational
temperature range from +12.6 to +49.3 °C and target range from +10 to +90 °C.
Original language | English |
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Title of host publication | Proceedings |
Subtitle of host publication | 2nd Electronics Systemintegration Technology Conference, ESTC 2008 |
Place of Publication | London |
Publisher | IEEE Institute of Electrical and Electronic Engineers |
Pages | 809-814 |
ISBN (Print) | 978-1-4244-2813-7, 978-1-4244-2814-4 |
DOIs | |
Publication status | Published - 2008 |
MoE publication type | A4 Article in a conference publication |
Event | 2nd Electronics System-Integration Technology Conference, ESTC 2008 - Greenwich, United Kingdom Duration: 1 Sept 2008 → 4 Sept 2008 |
Conference
Conference | 2nd Electronics System-Integration Technology Conference, ESTC 2008 |
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Abbreviated title | ESTV 2008 |
Country/Territory | United Kingdom |
City | Greenwich |
Period | 1/09/08 → 4/09/08 |
Keywords
- Temperature
- infrared measurement sensor
- mobile device
- calibration