摘要
分析了可调法布里-珀罗滤波器的工作原理,设计了扫描滤波的驱动电路。实验中由数字电路产生锯齿波信号,并借助模拟电路进行功率放大,获得上升沿占空比达到99.90%的输出。其频率在0～50 Hz范围内可调,驱动电压的幅值和偏置电压均可在0～30 V范围内调整。为便于后续信号的采集和寻峰,在单个自由光谱程范围内,利用3次曲线拟合方式对驱动电压进行修正,波长调谐的标准差分别降低62.7%、最大误差分别降低80.1%。
The working principle of the tunable Fabry-Perot （F-P） filter is analyzed, and the driving circuit of the filter is designed. In the experiment, a sawtooth wave is obtained by using a digital circuit, which is amplified by an analog circuit. Thus the duty cycle of the rising edge of the sawtooth wave can amount to 99.90%. And its frequency can be adjusted from 0 to 50 Hz. Both the amplitude of the output voltage and offset can be adjusted from 0 V to 30 V. To sample and search the signal and peak more easily, the applied voltage is rectified by using the cu- bic fitting algorithm in a free spectral range. Experiment results show that the standard error and the maximum error of the tuning wavelength are reduced by 62. 7% and 80. 1%, respectively.
出处
《电子科技》
2012年第8期16-19,共4页
Electronic Science and Technology
