The Application of Linear Variable Filter to Improve the Resolution of Micro Spectrometer Systems

Abstract:

Using a linear variable filter in front of photo-detector array such as CCD or CMOS detector array, we could minimize the impact of stray light and improve the resolution of micro spectrometers. Unfortunately, this method could not exhibit the spectral resolution of a parallel filter in the same way, because the transmitted beam from a linear variable filter has broadening. The broadening becomes limited in the linear variable filter for high-resolution spectral systems. In this study, through theoretical analysis of the focused beam and the experiments, we developed a method to improve the resolution of micro spectrometer. This method was useful for practical engineering applications.

• Periodical: Advanced Materials Research (Volumes 443-444)
• Pages: 156-159
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.443-444.156
• Online since: January 2012
• Authors: Luo Yang Chen, Ji Hong Zheng, Da Zhou Zhu, Rui Feng Hou, Da Yu Pan, Cheng Wang
• Keywords: Linear Variable Filter, Micro-Spectrometer, Resolution

References

[1] J. W. Goodman, Fourier optics, 2nd ed. (1996).

[2] M. Born and E. Wolf, Principles of Optics (1975).

[3] S. Grabarnik, R. Wolffenbuttel, A. Emadi, M. Loktev, E. Sokolova, and G. Vdovin, Planar double-grating microspectrometer, Opt. Express 15, 3581 (2007).

DOI: 10.1364/oe.15.003581

[4] O. Schmidt, P. Kiesel, S. Mohta, and N.M. Johnson, Resolving pm wavelength shifts in optical sensing, Appl. Phys. B 86, 593 (2006).

DOI: 10.1007/s00340-006-2456-y

[5] Natacha Oppelt, Wolfram mauser, Airborne Visable / Infrared Imaging Spectrometer AVIS : Design, Characterization and Calibbration, Sensors 2007, 7, 1934-(1953).

DOI: 10.3390/s7091934

[6] A. Krasolnikova, A. Piegari , M. Dami , L. Abel-Tiberini etc , Spatially resolved for non-uniform thin film coatings: comparison of two dedicated set-ups, SPIE , Bellingham , WA , (2005).

DOI: 10.1117/12.625183

[7] Luis Ruiz-Garcia , Pablo Gutierrez , Pilar barreiro , etc , Application of LVF-IR specific sensors for volatile assessment in fruits, unpublished.

[8] Sui, R., and J. A. Thomasson , Plant health sensing system for in situ determination of cotton nitrogen status,., ASAE Paper No. 041081. (2004).

DOI: 10.13031/2013.16151

[9] Lin mu Liu , Zheng mao Wu, Guang qiong Xia, "Gaussian beam incident obliquely on non-parallel Fabry - Perot interferometer intensity distribution after the projection , Optics , Jan, (2005).

[10] Tao Chen, Chong tai Luo, Hong kai Liu etc, Development of multi-band linear variable filters, Opto-Electronic Engineering, vol. 34, no 7, july, (2007).

[11] Dao yin Yu, Heng ying Tan, Optical Engineering, China Machine Press, in press.