Development of distance sensors for diagnosing air-gap anomalies in synchronous generators. - Ricardo Elias Caetano; Ivan Eduardo Chabu; Guido Stolfi; Josemir Coelho Santos; Shigueru Nagao; Carlos Eduardo Gomes; Raul Dias Paiva; Sílvio Ikuyo Nabeta; Fabio Jose Micerino (ISIE, 2015)