The Ineasurelnellt technique using a p 】 anar surface co 臼 [ las advantages uf acquirillg u locui Nudear Mag ! 1etic Resol ユ a1 】cc ( NMR )sig τ lal in sllort time frorn near the c 〔 ) il 、 This technlque is used t。 rneasure water − c ・ n 〔ent in p 。 1ymer electr ・ lyte membrane ( PEM )。f polymer electr ・ ly ・ te [ ucl cell ( PEFC ) , lncreasing NMR sigl ヨal intensity obt / nined b } ・ sul ' face coihs required f エ, r improvement of nleusurcrnent accuracy . In this puper , a racetrack . s }

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... d coi ユwas used in ordel 『 to 1ユ /akc s { gnal illtCl ' ISi しy illcrease und しu keep rrleztsurenuent . depth shallo " r . The detection arca and measurement depth { ⊃fthe raceLrack − shaped eoi ]at the case of sl)ill − echD measurement " ・ e ユ ' e analyzed theoretically . From thc analyLica ユrcsult , it was shown that the measurement depth of race しrack − ghaped con is { 〕 . 37 time the distance which 正 s between twu parallcl wires ol / nlc c 〔 )il . And from experimental resul 匸, it was shown tha し し llc obtained signal intensity " ' as pr()P ( , rticmal to Ineasuremc1 ]t voiulne uf しhe coil . Furtherm 〔 } re , in the case d }煎 surface coU w 員 h srual1 [ ndudance is used , the c/orrection fol ' m to be able to compcnsatc the differcnc . es Qf coil geullLc し ry and elec し ric ⊂ 〔 ) nductivity Qf coU was