Research and Development of AOTF Based NIR Spectrometer

文献类型： 外文期刊

第一作者： Zhang, Hui

作者： Zhang, Hui;Li, ShuJun;Bao, ManYu;Wen, Qi;Wang, WeiPing;Yan, HongFeng;Zhang, XiaoChao;Wang, Zhi;Wang, RuiJun

作者机构：

关键词： Acousto-optic Tunable Filter (AOTF);DDS;Radio Freqency (RF);NIR Spectrum

期刊名称：5TH INTERNATIONAL SYMPOSIUM ON ADVANCED OPTICAL MANUFACTURING AND TESTING TECHNOLOGIES: ADVANCED OPTICAL MANUFACTURING TECHNOLOGIES

ISSN： 0277-786X

年卷期： 2010 年 7655 卷

页码：

收录情况： SCI

摘要： In this paper, brief review of modern spectral techniques and instruments based on AOTF (Acousto-optic Tunable Filter) is presented. Total configuration of the infrared spectrometer with AOTF technique and part main module concrete design is introduced. Such as, Light source is collimated by fiber assembled lens, which can enhance diffraction light and separate diffraction light from transmission light; A MCU (Micro Controlling Unit) controls DDS (Direct Digital Synthesizer) to realize the radio-frequency driver; Real-time differential spectroscopy has been created by two photoelectric sensors, which reduced SNR (signal-to-noise ratio) obviously. Furthermore, the spectrum signal pre-treatment software and application software design is summarized. The self-made AOTF spectrometer can scan the pass-band of the spectrometer between 800nm and 1700nm with a bandwidth of 2nm at 800nm and 9nm at 1700nm by changing the radio-frequency (RF) driver frequency from 70 MHz to 20MHz. The experiment results show that the function of wave number vs scanning frequency has good linearity. The complete instrument used milk powder for sample, which found that the absorbing peak between measured spectrum and standard spectrum is coherent. The AOTF spectrometer is immune to orientation changes or even severe mechanical shock and vibrations, making it ideal for operation in harsh industrial environments. The actual application proves that it has high spectral resolution, high scanning speed and high signal output.

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