Yang Huai-dong, Xu Li, Chen Ke-xin, He Qing-sheng, He Shu-rong, Tan Qiao-feng, Jin Guo-fan
State Key Laboratory of Precision Mesaurement Technology and Instruments, Tsinghua University, Beijing 100084, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2005 Sep;25(9):1520-3.
An optimized photoelectric detector will increase the precision of a spectrometer, thus indicates an important way to develop high performance spectrometer. With an eye to this, a model describing the process that spectrogram is integrated and sampled by photoelectric detector and restored after low-pass filtering is developed. Based on the model, the influence of the characteristic parameters of the detector on the spectral line in the frequency domain is analyzed and the relation between the full width half maximum (FWHM) of the spectra line and the integral interval, sampling space and sensitivity of the detector is deduced. The conclusion indicates that both the integral interval and sampling space should be 1/6 of the FWHM for a spectral line with gaussian profile as a result of compromise between accuracy and feasibility. Moreover, the critical point deciding the right situation for scanner and array detector is given. Other guide line to optimize the photoelectric detector and increase accuracy is suggested also.
优化后的光电探测器将提高光谱仪的精度，这是开发高性能光谱仪的重要途径。基于此，建立了一个描述光电探测器对光谱图进行积分、采样并经低通滤波后恢复过程的模型。基于该模型，分析了探测器特性参数在频域对谱线的影响，推导了谱线半高宽（FWHM）与积分区间、采样间隔和探测器灵敏度之间的关系。结论表明，对于具有高斯分布的谱线，由于精度和可行性的折衷，积分区间和采样间隔均应为FWHM的1/6。此外，给出了决定扫描器和阵列探测器正确情况的临界点。还提出了优化光电探测器和提高精度的其他指导原则。
