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Lyot型液晶可调滤光片(Liquid Crystal Tunable Filter, LCTF)是目前广泛使用的快速调节滤光片，而在产品规格中通常只给出波长切换响应时间的大概值或范围值，在需要严格控制波长切换时间的应用场所往往制约器件的有效使用。文中提出了一种测量Lyot型LCTF波长切换响应时间的精确测量方法，其分起始波长和终止波长分别检测光强变化，通过对记录信号数据的分析得到测量结果。文中通过对一个可见光波段LCTF的实验测量验证了该方法的可行性，通过测量不确定度分析揭示了该方法具有很高的测量精度。 Lyot-type liquid crystal tunable filters (LCTF) are widely used as fast switch filters. A general value or a range of the response time of wavelength switch given in the product manual can’t support the efficient uses of instruments when the response time should be controlled rigorously. This paper presents a precise method of measuring the response time of wavelength switch for Lyot-type LCTF. Simultaneous measurement of the light intensity of the starting wavelength and ending wavelength is proposed, and the result is obtained by the analysis of the recorded data. The feasibility of this method is validated by the experiment of a visible light LCTF, and the fine precision is presented by the analysis of measurement uncertainty.
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松南 储 (2021) studied this question.
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