pimiПриборы и методы измеренийDevices and Methods of Measurements2220-95062414-0473BNTU10.21122/2220-9506-2020-11-1-53-59pimi-639Research ArticleМетоды измерений, контроля, диагностикиMethods of measurements, monitoring, diagnosticsДинамические характеристики ёмкостных датчиков влажностиThe Dynamic Behaviour of Capacitive Humidity SensorsМаевскиЯ.MajewskiJ.

Адрес для переписки:  Ja. Majewski – vLublin University of Technology, Nadbystrzycka str., 38A, Lublin 20-618, Poland.  e-mail: j.majewski@pollub.pl

Address for correspondence: J. Majewski – Lublin University of Technology, Nadbystrzycka str., 38A, Lublin 20-618, Poland e-mail: j.majewski@pollub.pl

j.majewski@pollub.plЛюблинский технический университетПольшаLublin University of TechnologyPoland2020170320201115359Copyright © Маевски Я., 20202020Маевски Я.Majewski J.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://pimi.bntu.by/jour/article/view/639

Рассмотрены конструктивные параметры и свойства чувствительных материалов, влияющие на время отклика ёмкостных датчиков влажности на основе полимеров. Выполнен краткий обзор и анализ способов определения динамических характеристик ёмкостных датчиков влажности в технической документации ведущих производителей, представленных на рынке.

Приведено описание схемы и работы экспериментальной установки для определения динамических характеристик ёмкостных датчиков влажности при различных значениях температуры влажного воздуха. Динамические характеристики ёмкостных датчиков влажности на основе полимеров определялись в виде отклика выходного сигнала при ступенчатом изменении влажности как с положительным, так и с отрицательным шагом. Времена отклика и восстановления, а также постоянные времени для экспоненциальной аппроксимации отклика на ступенчатое воздействие, определялись на основе результатов измерений графически либо аналитически.

Проанализированы изменения указанных параметров в пределах температур от – 30 °С до + 20 °С при атмосферном давлении. Приведены примеры полученных переходных характеристик, проиллюстрирован графический метод определения времён отклика и восстановления. Представлены графики зависимости времён отклика и восстановления, а также постоянных времени, от температуры. Предложены возможные объяснения полученных результатов.

The sensor design features and the sensing material properties which can influence the response time of the polymer-based capacitive humidity sensors are shortly discussed. The ways of specifying the dynamic properties of capacitive humidity sensors in technical data sheets by the leading companies on the market are briefly characterized and discussed.

The schematic view and operation of the experimental setup for determining of the dynamic parameters of capacitive humidity sensors at different temperatures of humid air are described. The dynamic behaviour of polymer-based capacitive humidity sensors was registered as the measurement profiles for both positive and negative step changes in humidity level. The response and recovery times, as well as the time constants for the exponential approximation fits of the step responses, were determined either graphically or analytically, based on the collected data.

The changes of these parameters under atmospheric pressure within the temperature range from – 30 °C to + 20 °C were analysed. The exemplary transient measurement profiles are shown, together with the illustrations of the graphical method for determining the response and recovery times. Also, the plots of the relationship between response and recovery times as well as time constants, and temperature, are presented. Some explanations of the obtained results are suggested.

динамические характеристики датчиковтемпературная зависимость времени откликаёмкостные датчики влажности на основе полимеровэкспоненциальная аппроксимация ступенчатого отклика датчикаdynamic behaviour of sensorsresponse time temperature dependencypolymer-based capacitive humidity sensorsexponential approximations of sensor step responseReferencesLee Ch.-V., Lee G.-B. Humidity Sensors: A Review, Sensor Letters, 2005, vol. 3, pp. 1‒14. DOI: 10.1166/sl.2005.001Lee Ch.-V., Lee G.-B. Humidity Sensors: A Review, Sensor Letters, 2005, vol. 3, pp. 1‒14. DOI: 10.1166/sl.2005.001Boudaden J., Steinmaßl M., Endres H.-E., Drost A., Eisele I., Kutter C., Müller-Buschbaum P. Polyimide-Based Capacitive Humidity Sensor. Sensors, 2018, vol. 18, pp. 1506‒1521. DOI: 10.3390/s18051516Boudaden J., Steinmaßl M., Endres H.-E., Drost A., Eisele I., Kutter C., Müller-Buschbaum P. Polyimide-Based Capacitive Humidity Sensor. Sensors, 2018, vol. 18, pp. 1506‒1521. 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The authors declare that there are no conflicts of interest present.