为了能够精确地测量线性渐变滤光片的光谱特征参数, 提出一种线性渐变滤光片的透过率检测方法.该方法在测量时, 用光谱仪分别采集滤光前和滤光后的光信号, 计算得到测量点的光谱透过率.调节微动位移平台, 对滤光片样品进行多点扫描测量, 数据处理后, 得到线性渐变滤光片的光谱特征参数.推导了测试光谱透过率的理论公式, 仿真结果表明该方法的测量精度随着线性色散系数的增大而减小, 在线性色散系数小于1.5 nm·mm-1时, 该方法测量的中心透过率和带宽的误差小于0.4%.根据该测量方法设计了相应的检测系统, 实际测量了线性渐变滤光片的光谱特征参数.

In order to accurately measure the spectral characteristic parameters of Linear Variable Filters (LVF), a method of measuring the transmission of LVF was presented. In this method, the spectral transmission at the measurement point was calculated by measuring the spectral signal of light source and transmitted light with a spectrometer. By adjusting the displacement platform, the spectral transmission at different positions was measured.Then the spectral characteristic parameters of LVF was obtained by data processing. The theoretical formula for measuring the spectral transmittance was deduced.The simulation results show that the accuracy of this method decreases as the linear dispersion increases. When the linear dispersion is less than 1.5 nm·mm-1, the errors of the measured center transmission and bandwidth are less than 0.4%. An experimental setup was built to test the spectral parameters of a linear variable filter.