Design and key technology research of portable UV-VIS spectrometer

Wang Guodong; Xia Guo; Li Zhiyuan; Hu Mingyong; Lu Hongbo

doi:10.12086/oee.2018.180195

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Wang Guodong, Xia Guo, Li Zhiyuan, et al. Design and key technology research of portable UV-VIS spectrometer[J]. Opto-Electronic Engineering, 2018, 45(10): 180195. doi: 10.12086/oee.2018.180195

Citation:

Wang Guodong, Xia Guo, Li Zhiyuan, et al. Design and key technology research of portable UV-VIS spectrometer[J]. Opto-Electronic Engineering, 2018, 45(10): 180195. doi: 10.12086/oee.2018.180195

Design and key technology research of portable UV-VIS spectrometer

1.
National Engineering Laboratory of Special Display Technology, National Key Laboratory of Advanced Display Technology, Academy of Photoelectric Technology, Hefei University of Technology, Hefei, Anhui 230009, China
2.
Key Laboratory of Optical Calibration and Characterization, Chinese Academy of Sciences, Hefei, Anhui 230031, China

Fund Project: Supported by Open subject of Key Laboratory of General Optical Calibration and Characterization Technology of the Chinese Academy of Sciences (JZ2016QTXM1135)

More Information

^*Corresponding author: Xia Guo, E-mail: xiaguo@hfut.edu.cn

Received Date 16 April 2018

Revised Date 18 June 2018

Published Date 01 October 2018

Abstract

Abstract

With the widespread application of ultraviolet spectroscopy, low-cost portable ultraviolet spectrometer has become a research focus in this field. Firstly, the optical structure of the portable UV-VIS spectrometer was designed based on the crossed-asymmetric Czerny-Turner structure in the paper. Secondly, the key devices of ultraviolet spectrometer, namely ultraviolet detectors and blazed gratings, were studied. The coated UV-enhanced CCDs were fabricated using Lumogen fluorescent materials and vacuum coating methods. The influence of the position on the CCD surface of the fluorescent film on the resolution was analyzed. The effect of blazed gratings on the multi-order diffraction efficiency in the ultraviolet region was theoretically studied. Finally, the test results of performance of a portable UV-VIS spectrometer prototype show that the resolution of the 200 nm~900 nm band, 25 μm slit width, 600 lp/mm, 300 nm blazed grating configuration is less than 1.5 nm and the spectral responsivity increases to 20% in the spectral range varying from 200 nm to 300 nm, which meets the design requirements of the portable UV-VIS spectrometer.
- UV-VIS spectrometer /
- Lumogen film /
- UV-enhanced /
- CCD /
- blazed grating /
- grating efficiency

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References

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Overview

Overview

Overview: With the widespread application of ultraviolet spectral detection technology, low-cost portable ultraviolet spectrometer has become a research hotspot in this field. For example, in chemical detection, the electronic spectrum of most molecules, which are in the ultraviolet region, can characterize the chemical reaction of a substance. Various experiment and application researches can be carried out with the qualitative and quantitative analysis of the molecular electronic spectrum using a ultraviolet spectrometer, such as analyzing the molecular composition of the analyte or determining whether the substance has undergone a chemical reaction or not. Owing to the absorption of ultraviolet light by the silicon substrate in the detector, it is hard to generate signal charges in the detector for the ultraviolet light. Therefore, the conventional spectrometer has a very low response to the ultraviolet band. In order to improve the response of the spectrometer to the UV band, the spectrum of the spectrometer's response is broadened. This article uses a simple and convenient method to improve the traditional spectrometer so that it can measure ultraviolet band. Based on this method, a UV-visible portable spectrometer prototype was developed. The innovations of the method proposed in this paper mainly include the following two points. First, a layer of fluorescent film is evaporated on the surface of the detector to convert ultraviolet light into visible light, thereby improving the ultraviolet responsivity of the detector. Second, we optimize the performance of the components in the spectrometer, thus increasing the incident light energy in the UV band. The structure of this paper is organized as follows. First, the optical path of the traditional portable cross-type Czerny-Turner structure spectrometer was designed. Second, the key components of the UV spectrometer were studied, namely UV detectors and blazed gratings. UV-enhanced CCDs were fabricated using Lumogen fluorescent material and vapor deposition film-forming method. The influence of the position of the fluorescent film on the CCD surface was analyzed. Based on the effects of blazed gratings on the multi-order diffraction efficiency in the ultraviolet region, the choice of a blazed grating for the UV spectrometer was determined. Finally, we developed an improved portable UV-visible spectrometer prototype. The performance test results show that its overall resolution of 200 nm~900 nm band is less than 1.5 nm when using 25 μm slit width, 600 lp/mm, and 300 nm blazed grating configurations. The spectral responsivity of 200 nm~300 nm ultraviolet band is increased to 20%, and the signal-to-noise ratio rises by about 30 times, meeting the design requirements of the portable UV-visible spectrometer.