研究目的
To develop a high-speed and narrow-bandpass liquid crystal filter for real-time multi-spectral imaging systems.
研究成果
The developed LCTF achieved a narrow bandpass of 5 nm FWHM and a fast wavelength-switching time of 30 ms, enabling real-time multispectral imaging at a frame rate of 22.7 fps. This system is highly adoptive for various spectral imaging applications, with potential for further improvements in transmittance.
研究不足
The transmittance of the developed LCTF was about 20%, which is lower due to components like polarizers and interference filters; improvement in transmittance is noted as a future subject. The response time was slowest during off-switching processes, indicating areas for optimization.
1：Experimental Design and Method Selection:
The study involved designing a liquid crystal tunable filter (LCTF) based on the Lyot-filter principle, optimized for narrow bandpass and fast switching. It utilized an interference filter, polarizers, phase retardation plates, and three liquid crystal cells. The driving method included overdrive techniques to enhance switching speed.
2：Sample Selection and Data Sources:
The filter was fabricated using specific materials and components, with transmission spectra measured using a spectrophotometer. Response time was evaluated with a high-speed optical detector, and imaging was tested with LEDs and a CMOS image sensor.
3：List of Experimental Equipment and Materials:
Equipment included a spectrophotometer (V-670 by JASCO Corp.), high-speed optical detector (CV-RS110 by Cremo Vision), interference filter, polarizers, phase retardation plates, liquid crystal cells (using MO38 nematic LC material from DIC Corp.), LEDs at specific wavelengths, lens, and CMOS image sensor.
4：Experimental Procedures and Operational Workflow:
The LCTF was designed and fabricated, transmission spectra were measured, response time was evaluated under different driving modes (normal and overdrive), and multispectral images were captured using the system setup with LEDs and the image sensor.
5：Data Analysis Methods:
Transmission spectra were analyzed to determine FWHM and transmittance. Response times were measured and compared between driving modes. Captured images were used to verify the system's performance.
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