Naslov
Automatic compensation of primary field coupling for a frequency-domain electromagnetic induction sensor

Autori
Ambruš, Davorin ; Vasić, Darko ; Bilas, Vedran

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
2017 IEEE International Instrumentation and Neasurement Technology Conference (I2MTC 2017) Proceedings / - Piscataway (NJ) : Institute of Electrical and Electronics Engineers (IEEE), 2017, 1346-1350

ISBN
978-1-5090-3596-0

Skup
2017 IEEE International Instrumentation and Measurement Technology Conference (I2MTC 2017)

Mjesto i datum
Torino, Italija, 22.05.2017. - 25.05.2017

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
metal detection ; electromagnetic induction sensor ; active induction balance, frequency-domain sensor

Sažetak
Residual mutual coupling between the transmitter and receiver coil(s) is a well-known problem in frequency-domain (FD) electromagnetic induction (EMI) sensors. In cases where a ratio of the measured signal to primary field coupling signal is sufficiently high, careful geometrical arrangements of coils, such as those used in EMI gradiometers, are normally sufficient for suppressing the primary field coupling. However, in applications requiring very high sensitivity, additional active means of sensor compensation are needed, since the measured object response may become commensurable with the primary field response and its thermally-induced fluctuations. In this paper, we investigate a technique for closed-loop automatic compensation of residual primary field coupling and its thermal drift, based on the use of an active sensor balancing. The technique is experimentally validated in a laboratory environment using a prototype of FD EMI sensor with magnetic cavity type design. Preliminary results indicate that direct coupling voltage can be effectively controlled, providing larger dynamic range and increased accuracy in measurements of EMI responses of small metallic objects.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

POVEZANOST RADA