Title :
A thick film NTC thermistor air flow sensor
Author :
Aleksic, Obrad S. ; Nikolic, P.M. ; Savic, Srdran ; Radojcic, B.M.
Author_Institution :
Inst. of Tech. Sci. of SASA, Belgrade, Serbia
Abstract :
Two planar NTC thick film thermistors were placed in a rectangular air guide with a large cross section area and connected to opposite branches of a Wheatstone bridge to form air flow sensor. Thick film sensors used in measurements were printed on alumina using of thermistor paste NTC 3K3 - 95/2 in EI Iritel. NTC thermistor paste was composed of submicronic powder (mixture of Mn, Co and Fe oxides), 4% B2O3 and an organic vehicle. The most suitable planar NTC thermistor geometry for an air sensor was segmented type with an optimized surface value of 75×12×0.5 mm. It was used to cover part of an open air gauge and conduct a heat from flowing air. The resistivity difference obtained on the thermistors was compared with the volume velocity of air laminar flow at room ambient temperature and humidity.
Keywords :
boron compounds; cobalt compounds; electric sensing devices; flow measurement; iron compounds; manganese compounds; thermistors; Wheatstone bridge; air laminar flow; alumina; humidity; large cross section area; opposite branches; rectangular air guide; room ambient temperature; submicronic powder; thermistor paste; thick film NTC thermistor air flow sensor; volume velocity; Bridge circuits; Geometry; Iron; Powders; Thermal sensors; Thermistors; Thick film sensors; Thick films; Thickness measurement; Vehicles;
Conference_Titel :
Microelectronics, 2004. 24th International Conference on
Print_ISBN :
0-7803-8166-1
DOI :
10.1109/ICMEL.2004.1314589
