外文翻譯---改進(jìn)的紅外測溫傳感系統(tǒng)的移動(dòng)設(shè)備(已修改)
2025-01-30 00:01 本頁面
【正文】 附錄AImproved infrared temperature sensing system for mobile devicesAbstractAn infrared (IR) temperature measurement systemconsists 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 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 , we show that if the sensor is embedded into a mobile (handheld) device which has heat sources, such as power electronics, the normal conditions are no longer valid and the calibration fails.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 ope~a~ional temperature variations was applied. The repeatabIlIty of the implemented IR temperature sensor using on a correct transferred calibration curve was better than 177。 176。C in an operational temperature range from + to + 176。C and target range from +10 to +90 176。C.Introduction Temperature is probably the most measured environmental parameter in the world. The global warming has dramatically increased the need of accurate temperature measurement of the environment. Temperature measurement is also required in numerous industrial and domestic applications. One important example is the temperature control of a microprocessor in a PC. Based on the temperature information produced by a thermistor both the microprocessor and the cooling system operation can be optimally controlled. Temperature control is also typically needed in household appliances, such as refrigerators, coffee makers and electric ovens. In addition, overheating protection is applied in several devices, such as motors and batteries. In consumer electronics, the main application is body thermometers, typically measured from the tympanic membrane in the ear. It is only natural to consider whether temperature sensing, which has such ubiquitous applications andgeneral interest, could be implemented in mobile handheld devices such as mobile phones. ThermIstorbased temperature sensors exist in a variety of products,including wristwatches and also a few mobile phones. However, their performance is highly limited for a simple physical reason. If we put a thermistor inside a mobile device we are able to measure the temperature of a localis~d volume within the device case. However, this does not necessarily correlate at all with the real ambient temperature due to two main reasons. Thermal contact from the environment to the thermistor is weak, but thermal contact from the device itself to the thermistor is strong. In
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