Optical Parameter Extraction of Plastic Materials Based on THz-TDS

For the optical parameters of engineering plastics materials, it proposes a high-precision extraction technology taking use of terahertz time domain spectroscopy system. We use the transmission-type terahertz time domain spectroscopy system to detect the refractive index, extinction coefficient and other optical parameters on the plastic material. In the range of 0.1THz~1.3THz frequency, the terahertz waves passing through the plastic material are collected and analyzed by time-domain and frequency-domain. The refractive index and extinction coefficient obtained after optimization are closer to the theoretical value, the extraction error is within ±0.008.