4 results about "Thz time domain spectroscopy" patented technology

Disclosed in the present invention is an Angelicae sinensis radix adulteration quantitative detection method based on terahertz spectroscopy and data fusion. The method comprises the following steps: (1) using Angelicae pubescentis radix powder as an adulterant, doping Angelicae pubescentis radix powder of different concentrations into Angelicae sinensis radix powder, and performing mixing to prepare samples having different adulteration levels; (2) putting each sample into a terahertz system, and measuring each sample to obtain terahertz absorption spectral information and time-domain spectral information of each sample; (3) performing feature extraction on the terahertz absorption spectral information of different samples; (4) using a Gramian angular difference field to convert terahertz time-domain spectra of different samples into images, and extracting image feature information; and (5) using a feature-level data fusion strategy to fuse feature information of terahertz absorption spectra with feature information of Gramian angular difference field images, so as to construct an Angelicae sinensis radix adulteration quantitative detection model. The present invention provides an efficient and reliable solution for Angelicae sinensis radix adulteration detection by using multi-modal feature information.

The present disclosure discloses a method for quantitative detection of adulteration in Angelica sinensis based on terahertz spectroscopy and data fusion, including: (1): taking Angelica pubescens powder as an adulterant; mixing different concentrations of the Angelica pubescens powder into Angelica sinensis powder to prepare samples with varying adulteration levels; (2): placing each sample into a terahertz system, and measuring each sample to obtain terahertz absorption spectrum and time-domain spectral information for the sample; (3): performing feature extraction on the terahertz absorption spectral information of each sample; (4): Utilizing Gramian Angular Difference Field (GADF) to achieve conversion of terahertz time-domain spectra to images, and extracting image feature information; and (5): adopting a feature-level data fusion strategy to integrate feature information from the terahertz absorption spectra and GADF images, and constructing a quantitative adulteration detection model for Angelica sinensis.

This application provides a terahertz wave testing device and a method for correcting CO2 diffusion and solubility parameters, relating to the field of oil and gas field development technology. The device includes: a CO2 storage tank, a reference cylinder, a sample cylinder, a pulsed laser emitter, a beam splitter, a signal delayer, a reflector, a signal generator, a signal receiver, a first reflector, and a second reflector. The CO2 storage tank is connected to the reference cylinder, and the reference cylinder is connected to the sample cylinder. A controllable valve is also installed on the connecting pipeline between the reference cylinder and the sample cylinder to control the on / off state of the connecting pipeline. The beam splitter, signal delayer, and reflector are sequentially arranged in the laser emission direction of the pulsed laser emitter. The terahertz pulse wave generated by the signal generator is incident on the sample cylinder through the first reflector and then reflected to the signal receiver by the second reflector. The terahertz wave testing device of this application can monitor the bulk water content in real time based on terahertz wave time-domain spectroscopy, thereby correcting the diffusion coefficient and solubility of CO2 in heavy oil.

The application discloses a time-domain spectrum system capable of generating and detecting ultra-wideband terahertz pulses. The system comprises a laser light source, a light splitting module, an optical path adjustment coupling module, a terahertz emission module, a sample detection module and an electro-optic sampling module. After the laser pulses output by the laser light source are split, the pump light is chopped, modulated, expanded and irradiated to a spin terahertz emitter to generate ultra-wideband terahertz pulses of 0.1-10 THz. After the terahertz pulses interact with the sample through a confocal off-axis parabolic mirror, the terahertz pulses are collimated and output again. The detection light formed by light splitting is adjusted in optical path and coincides with the terahertz pulses in time and space, and is focused on an ultra-thin ZnTe crystal in the <110> crystal direction. Finally, the terahertz time-domain signal is obtained through electro-optic sampling. The system has the functions of emitting and detecting ultra-wideband terahertz pulses, and can be used not only in the fields of material detection and physicochemical analysis, but also in the precise verification of the characteristics of other terahertz sources and detection crystals.