Volume 14 Issue 6
Nov.  2021
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Article Contents
FAN Ji-ze, LI Bo, ZHANG Lu, JU Yan-fang. Design of an improved Offner spectrometer for crop fluorescence detection[J]. Chinese Optics, 2021, 14(6): 1459-1467. doi: 10.37188/CO.2021-0073
Citation: FAN Ji-ze, LI Bo, ZHANG Lu, JU Yan-fang. Design of an improved Offner spectrometer for crop fluorescence detection[J]. Chinese Optics, 2021, 14(6): 1459-1467. doi: 10.37188/CO.2021-0073

Design of an improved Offner spectrometer for crop fluorescence detection

doi: 10.37188/CO.2021-0073
Funds:  Supported by National key Research and Development Program of China (No. 62005268)
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  • Corresponding author: libo0008429@163.com
  • Received Date: 2021-04-07
  • Rev Recd Date: 2021-04-29
  • Available Online: 2021-06-26
  • Publish Date: 2021-11-19
  • To monitor crop growth more efficiently, various kinds of hyperspectral spectrometers have been designed to detect chlorophyll fluorescence. In this paper, the traditional Offner spectrometer system is improved, and a structure with a higher spectral resolution is obtained. The double-reflection telescope system is selected, and the spectrometer adopts a highly dense linear reflective convex grating to achieve higher spectral resolution. On this basis, an amplifying lens is added to meet the need for a long slit. An Offner structure is obtained with a slit and image plane on the same side of the grating. The initial structure of the telescope system and the spectrometer are optimized by codeV software. The results show that the spectral resolution is 0.3 nm in the range of 670~780 nm, the overall Modulation Transfer Function (MTF) is greater than 0.75 at the cut-off frequency of 17 lp/mm, and the Root Mean Square radius (RMS) of the speckle is less than 15 μm. The proposed system can meet the requirements of highly precise real-time monitoring in crop growth chlorophyll detection.
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