Contactless dual-function sensors based on Si-cholesteric liquid crystal systems for optical identification

• Published in: Journal of materials science. Materials in electronics 2024-06, Vol.35 (18), p.1237, Article 1237
• Main Authors: Fechan, A., Khoverko, Yu, Daliavskyi, V., Dyhdalovych, T.
• Format: Article
• Language: English
• Subjects: Algorithms; Characterization and Evaluation of Materials; Chemistry and Materials Science; Cholesteric liquid crystals; Color temperature; Contact pressure; Electromagnetic interference; Graphical user interface; Materials Science; Modules; Monitoring; Optical activity; Optical and Electronic Materials; Sensors; Silicon; Software; Temperature sensors
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-024-13005-5

In the work, a study of the design and technological direction of creating a dual-functional non-contact pressure and temperature sensor based on silicon-cholesteric crystal systems was carried out. An optically active environment based on a supramolecular spiral structure is a sensitive element for forming the optical response of a microelectronic label sensor during non-contact monitoring of the state of a physical object using a spectrometer. The optical response of the device provides maximum intensity in the case of interference that corresponds to the Wulff–Bragg condition. The functionality of the sensor is ensured by the conditions for avoiding high electromagnetic interference during optical identification. A hardware and software modules have been created for non-contact monitoring of the state of physical objects, the main part of which is graphical user interface that corresponds to the MVVM architectural design pattern. Visualization of the spectral intensity using the software module was provided by conversion to the RGB model. The algorithm of procedure for calculating the color rendering index is given. In a wide range of light waves, the main parameters' color temperature was defined.