摘要
利用BGO(锗酸铋 )晶体作传感头的光纤电压传感器 ,并用偏振光分析法推出了它的数学模型。利用稳频后的He -Ne激光器作为测量光源 ;采用补偿测量方案消除晶体自然双折射 (应力、温度等 )引起的误差 ;讨论了各光学元件粘接方位角误差对测量精度的影响 ;系统中用间接测量法测量空气的折射率 ,对测量方程进行实时修正 ;采用高精度屏蔽电压器和小波分析算法提高系统的信噪比。实验结果表明 ,其测量电压误差不大于 0 92 %。
An optical fiber voltage sensor is studied. Polarization analysis method is used to obtain a mathematical model. The system source is He-Ne laser with robust frequancy. Compensation technology is used to eliminate the error owing to birefringence effect. The influences of the angles error are discussod and the indirect measurement is introduced to this system to obtain the refractive index of air and correct it in real time.The high precision shielded transformer and wavelet analysis are introduced to enhance the signal-to-noise ratio. The experiment demonstrates that measuring error is less than 0 92%.
出处
《传感技术学报》
CAS
CSCD
2004年第2期317-321,共5页
Chinese Journal of Sensors and Actuators
关键词
偏振调制
JONES矩阵
双折射
小波分析
Polarization modulation
Jones matrix
Birefringence
wavelet analysis
