Mr. Zhang Hui Profile

Zhang Hui

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Proceedings Article | 7 October 2010 Paper

Research and development of AOTF based NIR spectrometer

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

Proceedings Volume 7655, 76552V (2010) https://doi.org/10.1117/12.866648

KEYWORDS: Spectroscopy, Near infrared, Signal processing, Light, Light sources, Diffraction, Data acquisition, Signal to noise ratio, Crystals, Acousto-optics

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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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