Zhao Li-wei, Zhang Yi-hua, Wang Mei-jia, Song Da-qian, Zhang Han-qi, Jin Qin-han
Dept. of Chem., Jilin University, Changchun 130023, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2002 Jun;22(3):472-5.
An acousto-optic tunable filter (AOTF) is an all-solid-state, electronic monochromator that is based on the diffraction of light by an acoustic wave in an anisotropic crystal. It is a new kind of tunable small filter with narrow band compared with traditional unicolor filter. The filter can diffract incident white light at a specific wavelength when a specific radio frequency is applied into it. An AAS experimental setup using a microwave plasma torch (MPT) as the atomizer, and a visible AOTF as the wavelength selector was developed and the analytical performance was evaluated by determination of Na. The effect on the absorption signal of some operating conditions, including the observation height, the microwave forward power and the carrier and support gas flow rates for MPT, were investigated. The detection limit for Na was shown to be 0.23 microgram.mL-1 and the relative standard deviation was 2.6% (n = 6).
声光可调滤光器（AOTF）是一种全固态电子单色仪，它基于声波在各向异性晶体中对光的衍射。与传统的单色滤光器相比，它是一种新型的窄带可调谐小型滤光器。当向该滤光器施加特定射频时，它能使特定波长的入射白光发生衍射。开发了一种以微波等离子体炬（MPT）作为原子化器、可见AOTF作为波长选择器的原子吸收光谱（AAS）实验装置，并通过测定钠来评估其分析性能。研究了一些操作条件对吸收信号的影响，这些条件包括观测高度、微波正向功率以及MPT的载气和辅助气体流速。钠的检测限为0.23微克·毫升⁻¹，相对标准偏差为2.6%（n = 6）。
