Sensors (Feb 2024)

Online Testing Method for the Fine Spectral Characteristics of Narrow-Band Interference Filters Based on a Narrow-Linewidth Tunable Laser

  • Kaijun Ji,
  • Yong Yang,
  • Xin Lin,
  • Jiaming Liang,
  • Kaijie Ji,
  • Jiqin Wang,
  • Linmei Liu,
  • Zhenwei Chen,
  • Wei Wang,
  • Xuewu Cheng,
  • Faquan Li

DOI
https://doi.org/10.3390/s24041152
Journal volume & issue
Vol. 24, no. 4
p. 1152

Abstract

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The transmission spectrum of a narrow-band interference filter is crucial and highly influenced by factors such as the temperature and angle, thus requiring precise and online measurements. The traditional method of measuring the transmission spectrum of an interference filter involves the use of a spectrometer, but the accuracy of this method is limited. Moreover, placing a narrow-band interference filter inside a spectrometer hinders real-time online measurements. To address this issue, there is demand for high-precision online spectral testing methods. In response to this demand, we propose and experimentally validate a fine spectral characterization method for narrow-band interference filters. This method uses a narrow-linewidth tunable laser, achieving a spectral resolution in the MHz range for online testing. Two types of narrow-band interference filters were tested using the constructed laser spectroscopy experimental system, obtaining a transmission spectrum with a spectral resolution of 318 MHz. In comparison to spectrometer-based methods, our proposed method demonstrates higher spectral accuracy, enables online measurements, and provides more accurate measurements for special spectral interference filters. This approach has significant application value and promising development prospects.

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