用于探测极低频信号的光纤传感器相位生成载波解调方法 刘育梁.pdf

38 4 V ol . 38, N o. 4 20 11 4 CHINESE JOURNAL OF LASERS April, 2011 用于探测极低频信号的光纤传感器相位 生成载波解调方法 王 林 何 俊 李 芳 刘育梁 ( , 100083) ( PG C) P GC ( DCM ) ( A r ctang ent) , , DCM P GC , , A r ctang ent P GC , P GC , , A rctangent P GC D CM P GC , , A r ctang ent PG C , 0. 0 1 H z, 4 10- 4 rad H z , 110 dB @ 1 H z , 99 . 99 % ; ; ; ; T N 253; T P2 12 . 4 A doi: 10 . 37 88/ CJL 201138. 040500 1 Ultra Low Frequency Phase Generated Carrier Demodulation Technique for Fiber Sensors Wang Lin He Jun Li Fang L iu Yuliang ( Optoelect r onics System La bor a tor y , In stit ut e of Semicon du ctor s , Chinese Academ y of Scien ces , Beij ing 100083, Chin a ) Abstract A high resolu ion ul ra low frequency phase genera ed carrier ( PGC) demodula ion echnique for in erferome ric fiber sensors is proposed. The differen ial cross mul iplica ion( DCM) algori hm and he Arc angen algori hm of PGC echnique are analyzed heore ically and simula ed by compu er for ul ra low frequency demodula ion. And he resul s show ha an unnecessary random direc curren ( DC) drif is induced in he recovered signal of DCMPGC, bu i doesn exi in ha of Arc angenPGC. To demons ra e he conclusion, an op ical fiber in erferome erbased ul ra low frequency sensing sys em is se up, and he comparable experimen s of DCMPGC and Arc angenPGC are carried ou . The experimen al resul s show ha only Arc angen PGC can be used for ul ra