长周期光纤光栅线性滤波解调系统实验研究及改进

Experimental study and improvement for linear filtering demodulation system of LPFG

在利用长周期光纤光栅(LPFG)准线性段进行线性滤波解调中,对LPFG准线性段进行一次线性拟合得到的结果误差较大,提出通过对LPFG透射谱的分段线性拟合和对LPFG进行温度控制使其谐振波长移动来选择不同的线性段,从而实现不同灵敏度解调。给出了基于DSP的实现方法及基于VC++对话框中MFC编程实现的监测界面。最后简要给出了该系统的潜在应用领域。

Since the error of the result is comparatively large in the linear filtering demodulation with the quasi-linear waveband of LPFG when fitting the quasi-linear waveband of long period fiber grating （LPFG） only once, through fitting the quasi-linear waveband of LPFG in several sub-wavebands and controlling the temperature of the LPFG were introduced so as to cause the shift of the resonant wavelength of the LPFG to realize demodulation with different sensibility. The implementation based on DSP was given, the monitoring interface realized by MFC programming based on the dialog box of the VC＋＋ was given, and the potential application areas were given as well.