Improved infrared temperature sensing system for mobile devices

Kimmo Keränen; Jukka-Tapani Mäkinen; Pentti Korhonen; Eveliina Juntunen; Veli Heikkinen; Jakke Mäkelä

doi:10.1109/ESTC.2008.4684455

Improved infrared temperature sensing system for mobile devices

Kimmo Keränen, Jukka-Tapani Mäkinen, Pentti Korhonen, Eveliina Juntunen, Veli Heikkinen, Jakke Mäkelä

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

1 Citation (Scopus)

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embedded into a mobile (hand-held) device which has heat sources, such as power electronics, the normal conditions are no longer valid and the calibration fails.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
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	https://doi.org/10.1109/ESTC.2008.4684455
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 Sep 2008 → 4 Sep 2008

Conference

Conference	2nd Electronics System-Integration Technology Conference, ESTC 2008
Abbreviated title	ESTV 2008
Country	United Kingdom
City	Greenwich
Period	1/09/08 → 4/09/08

Keywords

Temperature
infrared measurement sensor
mobile device
calibration

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10.1109/ESTC.2008.4684455

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Keränen, K., Mäkinen, J-T., Korhonen, P., Juntunen, E., Heikkinen, V., & Mäkelä, J. (2008). Improved infrared temperature sensing system for mobile devices. In Proceedings: 2nd Electronics Systemintegration Technology Conference, ESTC 2008 (pp. 809-814). IEEE Institute of Electrical and Electronic Engineers. https://doi.org/10.1109/ESTC.2008.4684455

@inproceedings{b6d62ee46b034b7098e04e384aa49e93,

title = "Improved infrared temperature sensing system for mobile devices",

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.",

keywords = "Temperature, infrared measurement sensor, mobile device, calibration",

author = "Kimmo Ker{\"a}nen and Jukka-Tapani M{\"a}kinen and Pentti Korhonen and Eveliina Juntunen and Veli Heikkinen and Jakke M{\"a}kel{\"a}",

note = "Project code: 21585; 2nd Electronics System-Integration Technology Conference, ESTC 2008, ESTV 2008 ; Conference date: 01-09-2008 Through 04-09-2008",

year = "2008",

doi = "10.1109/ESTC.2008.4684455",

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Keränen, K , Mäkinen, J-T, Korhonen, P, Juntunen, E, Heikkinen, V & Mäkelä, J 2008, Improved infrared temperature sensing system for mobile devices. in Proceedings: 2nd Electronics Systemintegration Technology Conference, ESTC 2008. IEEE Institute of Electrical and Electronic Engineers, London, pp. 809-814, 2nd Electronics System-Integration Technology Conference, ESTC 2008, Greenwich, United Kingdom, 1/09/08. https://doi.org/10.1109/ESTC.2008.4684455

Improved infrared temperature sensing system for mobile devices. / Keränen, Kimmo ; Mäkinen, Jukka-Tapani; Korhonen, Pentti; Juntunen, Eveliina; Heikkinen, Veli; Mäkelä, Jakke.

Proceedings: 2nd Electronics Systemintegration Technology Conference, ESTC 2008. London : IEEE Institute of Electrical and Electronic Engineers, 2008. p. 809-814.

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

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AU - Keränen, Kimmo

AU - Mäkinen, Jukka-Tapani

AU - Korhonen, Pentti

AU - Juntunen, Eveliina

AU - Heikkinen, Veli

AU - Mäkelä, Jakke

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N2 - 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.

AB - 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.

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KW - infrared measurement sensor

KW - mobile device

KW - calibration

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M3 - Conference article in proceedings

SN - 978-1-4244-2813-7

SN - 978-1-4244-2814-4

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BT - Proceedings

PB - IEEE Institute of Electrical and Electronic Engineers

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