Patents by Inventor Qiuhong CAO

Qiuhong CAO has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Terahertz spectrum measurement method and system based on unequal optical path method
    Patent number: 11408823
    Abstract: Terahertz spectrum measurement method and system based on an unequal optical path method is provided. By using a Femtosecond laser and a Terahertz time-domain spectroscopy system, samples to be measured and having different thicknesses are subjected to scanning by time-domain Terahertz signals to obtain transmission signals of the samples with two different thicknesses. The signal after passing through a sample with the thickness of d1 is a reference signal, and the signal after passing through a sample with the thickness of d2 is a sample signal. When Terahertz waves are normally incident to the samples and having different thicknesses, the signals emitted from the samples have an optical path difference therebetween. Phase-containing frequency spectra are obtained after time-domain signals are subjected to Fourier transform. The parameters, such as a refractive index, an extinction coefficient, and an absorption coefficient, can be calculated through the extracted phase-containing frequency spectrums.
    Type: Grant
    Filed: May 4, 2021
    Date of Patent: August 9, 2022
    Assignee: SHANDONG UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Dehua Li, Beibei Ji, Zhaoxin Li, Wei Zhou, Binbin Song, Qiuhong Cao
  • TERAHERTZ SPECTRUM MEASUREMENT METHOD AND SYSTEM BASED ON UNEQUAL OPTICAL PATH METHOD
    Publication number: 20220107268
    Abstract: Terahertz spectrum measurement method and system based on an unequal optical path method is provided. By using a Femtosecond laser and a Terahertz time-domain spectroscopy system, samples to be measured and having different thicknesses are subjected to scanning by time-domain Terahertz signals to obtain transmission signals of the samples with two different thicknesses. The signal after passing through a sample with the thickness of d1 is a reference signal, and the signal after passing through a sample with the thickness of d2 is a sample signal. When Terahertz waves are normally incident to the samples and having different thicknesses, the signals emitted from the samples have an optical path difference therebetween. Phase-containing frequency spectra are obtained after time-domain signals are subjected to Fourier transform. The parameters, such as a refractive index, an extinction coefficient, and an absorption coefficient, can be calculated through the extracted phase-containing frequency spectrums.
    Type: Application
    Filed: May 4, 2021
    Publication date: April 7, 2022
    Inventors: Dehua LI, Beibei JI, Zhaoxin LI, Wei ZHOU, Binbin SONG, Qiuhong CAO