Title :
Low-frequency response of pyroelectric sensors
Author :
Kang, Seong Jun ; Samoilov, Vladimir B. ; Yoon, Yung Sup
Author_Institution :
Sch. of Electr. & Comput. Eng., Inha Univ., Inchon, South Korea
Abstract :
Sensitivity of pyroelectric IR-detectors of slow thermal processes, especially of human body sensors, depends strongly on their response in the infra-low (/spl sim/0.1 to 1 Hz) region of frequency spectrum. The main mechanisms of heat losses-heat conduction of environment, lateral heat conduction in the plane of sensitive element, and emission of radiation-are considered. Their influence on the low-frequency response of pyroelectric sensors is estimated. Exact solutions and simple expressions for quantitative description of main specific features of real systems are obtained. Criteria of validity of the adequate models are determined.
Keywords :
heat conduction; heat losses; heat radiation; infrared detectors; pyroelectric detectors; sensitivity; 0.1 to 1 Hz; IR-detectors; emission of radiation; frequency spectrum; heat losses; human body sensors; infra-low region; lateral heat conduction; low-frequency response; pyroelectric sensors; sensitive element; thermal processes; Biological system modeling; Dielectric substrates; Electrodes; Frequency estimation; Humans; Infrared detectors; Motion detection; Pyroelectricity; Surface resistance; Thermal sensors;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
