TY - GEN
T1 - A new enhanced Howland voltage controlled current source circuit for EIT applications
AU - Al-Obaidi, Abdullah Azher
AU - Meribout, Mahmoud
PY - 2011
Y1 - 2011
N2 - A current source is one of the most important circuits in Electrical Impedance Tomography (EIT) hardware systems for measuring conductive multiphase flows. One of its important and challenging features is to deliver a relatively large and constant current for a wide range of resistive loads, high signal to noise ratio, and a large bandwidth. This paper presents a new voltage controlled current source for EIT applications. It is based on Howland circuit and uses two similar current sources circuits operating in parallel. Furthermore, the paper suggests a General Inverter Circuit (GIC) to remove the effect of eventual stray capacitances which usually appear across the load. Experimental results using Multisim software indicates that the new suggested circuit presents a more stable impedance output over a range of 100 to 3000 . Furthermore, it was found that the current remains stable for range of 100 to 6000 .
AB - A current source is one of the most important circuits in Electrical Impedance Tomography (EIT) hardware systems for measuring conductive multiphase flows. One of its important and challenging features is to deliver a relatively large and constant current for a wide range of resistive loads, high signal to noise ratio, and a large bandwidth. This paper presents a new voltage controlled current source for EIT applications. It is based on Howland circuit and uses two similar current sources circuits operating in parallel. Furthermore, the paper suggests a General Inverter Circuit (GIC) to remove the effect of eventual stray capacitances which usually appear across the load. Experimental results using Multisim software indicates that the new suggested circuit presents a more stable impedance output over a range of 100 to 3000 . Furthermore, it was found that the current remains stable for range of 100 to 6000 .
KW - Current Source
KW - Electrical Impedance Tomography
KW - General Impedance Converter
UR - http://www.scopus.com/inward/record.url?scp=79958001657&partnerID=8YFLogxK
U2 - 10.1109/IEEEGCC.2011.5752526
DO - 10.1109/IEEEGCC.2011.5752526
M3 - Conference contribution
AN - SCOPUS:79958001657
SN - 9781612841199
T3 - 2011 IEEE GCC Conference and Exhibition, GCC 2011
SP - 327
EP - 330
BT - 2011 IEEE GCC Conference and Exhibition, GCC
T2 - 2011 IEEE GCC Conference and Exhibition, GCC 2011
Y2 - 19 February 2011 through 22 February 2011
ER -