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<p>The article is devoted to the study of the features of monitoring of changes in the color passive sensors, tracking the spectral distribution of the light intensity of the liquid crystal color depending on the operating conditions. The functional component of a passive, non-contact sensor is a combination of an elastic silicon membrane and cholesteric liquid crystals as an optically active environment, which, due to the action of an external physical factor, for example temperature, undergo a rearrangement of the geometry of the spiral of the supramolecular structure of the film. It has been determined that without using electrically induced methods that cause a high level of electromagnetic interference ensures high competitiveness of such devices. It is proposed to use a hardware-software complex for monitoring, which contains a spectrometer and allows real-time display, as well as recording of the received information into file arrays, of various optical characteristics such as spectral intensity distribution, and color rendering index. It was established that in the wavelength range from 370 to 650&#xa0;nm, the proposed method for evaluating the color characteristics of samples using optically active environment of liquid cholesteric crystals allows estimating the parameters of the spectral intensity distribution with sufficient sensitivity. Thus, for wavelengths from 450 to 550&#xa0;nm, the maximum intensity is I = 1.42 rel.u, and the resolution of the method lies in the wavelength range up to 100&#xa0;nm, i.e., when the wavelength changes by 10&#xa0;nm, the intensity increases by 0.14 rel.u.</p>

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Passive sensors for non-contact monitoring ecosystems based on optically active environment

  • 期刊论文

  • 发表日期：

    2025年12月26日

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  • A. Fechan,
  • Yu. Khoverko,
  • O. Shymchyshyn,
  • E. Dzhumelia,
  • V. Daliavskyi

摘要

The article is devoted to the study of the features of monitoring of changes in the color passive sensors, tracking the spectral distribution of the light intensity of the liquid crystal color depending on the operating conditions. The functional component of a passive, non-contact sensor is a combination of an elastic silicon membrane and cholesteric liquid crystals as an optically active environment, which, due to the action of an external physical factor, for example temperature, undergo a rearrangement of the geometry of the spiral of the supramolecular structure of the film. It has been determined that without using electrically induced methods that cause a high level of electromagnetic interference ensures high competitiveness of such devices. It is proposed to use a hardware-software complex for monitoring, which contains a spectrometer and allows real-time display, as well as recording of the received information into file arrays, of various optical characteristics such as spectral intensity distribution, and color rendering index. It was established that in the wavelength range from 370 to 650 nm, the proposed method for evaluating the color characteristics of samples using optically active environment of liquid cholesteric crystals allows estimating the parameters of the spectral intensity distribution with sufficient sensitivity. Thus, for wavelengths from 450 to 550 nm, the maximum intensity is I = 1.42 rel.u, and the resolution of the method lies in the wavelength range up to 100 nm, i.e., when the wavelength changes by 10 nm, the intensity increases by 0.14 rel.u.