A method for extracting porosity of porous traditional Chinese medicine tablets under different pressures based on terahertz time-domain difference characteristics

By utilizing terahertz time-domain spectroscopy and modified medium theory, the problem of unknown structure in the porosity detection of traditional Chinese medicine tablets was solved, enabling rapid and accurate porosity measurement and improving detection efficiency and accuracy.

CN116202986BActive Publication Date: 2026-06-19BEIJING YUANDA HENGTONG TECH DEV CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING YUANDA HENGTONG TECH DEV CO LTD
Filing Date
2023-03-06
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing technologies require known pore structure information when detecting the porosity of traditional Chinese medicine tablets. Furthermore, traditional methods suffer from large errors, large sample volumes, and long analysis times, making it impossible to accurately detect the porosity of traditional Chinese medicine tablets when the pore structure is unknown.

Method used

By measuring the mechanical and morphological parameters of traditional Chinese medicine tablets, extracting terahertz time-domain difference characteristics using a terahertz time-domain spectroscopy system, and combining the effective medium theory modified by Maxwell-Garnett and Bruggeman, a relationship model between porosity and refractive index is established, enabling non-contact, rapid, and non-destructive measurement of porosity.

Benefits of technology

This technology enables rapid and accurate detection of the porosity of traditional Chinese medicine tablets even when the pore structure is unknown, reducing sample damage and improving measurement accuracy and efficiency.

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Abstract

This invention provides a method for extracting the porosity of porous traditional Chinese medicine (TCM) tablets under different pressures based on terahertz time-domain differences. By utilizing the mechanical and morphological parameters of the TCM tablets, the nominal porosity of the tablets under different pressures is obtained using formulas. Taking advantage of the differences in terahertz time-domain spectral characteristic parameters of TCM tablets under different pressures, the intrinsic refractive index of the porous TCM powder is extracted, and a relationship model between the porosity of the TCM tablets and the terahertz time-domain spectral characteristic parameters is established, enabling porosity detection. This method allows for non-contact measurement of the internal porosity of TCM under different pressures, even when the porosity of all samples is unknown, achieving a non-contact, rapid, and non-destructive measurement effect.
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