TY - JOUR
T1 - A Low-Noise Seven-Channel DC SQUID Magnetometer for Brain Research
AU - Kajola, Matti
AU - Ahlfors, Seppo
AU - Ahonen, Antti
AU - Hällström, Jari
AU - Knuutila, Jukka
AU - Lounasmaa, Olli V.
AU - Tesche, Claudia
AU - Vilkman, Visa
PY - 1987/1
Y1 - 1987/1
N2 - The design, construction, and performance of a high-sensitivity DC SQUID magnetometer, covering a circular area of 93 mm diameter, is described. The device, now used routinely in our brain research, comprises seven asymmetric first-order gradiometers, located on a spherical surface of 125 mm radius and with the symmetry axis tilted 30° in respect to the vertical. The overall field sensitivity of the system, measured inside our magnetically shielded room, is 5 - 6 fT/√Hz, mainly caused by thermal noise in the radiation shields of the dewar.
AB - The design, construction, and performance of a high-sensitivity DC SQUID magnetometer, covering a circular area of 93 mm diameter, is described. The device, now used routinely in our brain research, comprises seven asymmetric first-order gradiometers, located on a spherical surface of 125 mm radius and with the symmetry axis tilted 30° in respect to the vertical. The overall field sensitivity of the system, measured inside our magnetically shielded room, is 5 - 6 fT/√Hz, mainly caused by thermal noise in the radiation shields of the dewar.
UR - http://www.scopus.com/inward/record.url?scp=84956119116&partnerID=8YFLogxK
U2 - 10.7567/JJAPS.26S3.1555
DO - 10.7567/JJAPS.26S3.1555
M3 - Article
AN - SCOPUS:84956119116
SN - 0021-4922
VL - 26
SP - 1555
EP - 1556
JO - Japanese Journal of Applied Physics
JF - Japanese Journal of Applied Physics
IS - S3-2
ER -