Tea/cosmetics quality detecting method based on two-dimensional correlation spectra

A two-dimensional correlation spectroscopy, quality detection technology, applied in the field of analysis and detection instruments, can solve problems such as the inability to meet the requirements of fast, real-time measurement, long time for temperature variables, and insufficient automation.

Active Publication Date: 2015-10-14
JIANGSU DINGYUN INFORMATION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods improve the detection accuracy of traditional one-dimensional spectroscopy, but the temperature variables they add take a long time, and the added polarization disturbance variables make the system complex and not automatic enough to meet the requirements of fast and real-time measurement

Method used

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  • Tea/cosmetics quality detecting method based on two-dimensional correlation spectra
  • Tea/cosmetics quality detecting method based on two-dimensional correlation spectra
  • Tea/cosmetics quality detecting method based on two-dimensional correlation spectra

Examples

Experimental program
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Effect test

Embodiment

[0041] Such as figure 1 As shown, when testing a tea sample, the tea sample 1 to be tested is placed under the detection system 2, and the microprocessor 7 controls the switching, on-off, and intensity of the excitation light source 3 through the drive control module 6, as well as stepping The motor 5 rotates to make the filter group 4 switch correspondingly, and on the other hand, the spectrometer 9 is controlled to record the optical signal excited by the sample and transmitted through the optical fiber 10 . Record multiple reflectance or fluorescence spectral data under multiple different LED excitations or different light intensities, and these spectral data are preprocessed and correlated by the microprocessor 7 to obtain the required two-dimensional correlated synchronous spectrum or asynchronous spectrum, in order to represents the tea sample. Afterwards, the spectrum is input into the established model, and the detection result is displayed on the display screen 8 af...

example

[0042] Example: detection of Shifeng tea grade

[0043] Tea samples: Seven types of Shifeng Longjing tea leaves that have been graded by experts, the higher the grade, the better the quality of the tea

[0044] (1) Collect the fluorescence spectrum data of tea samples.

[0045] Place each tea sample to be tested evenly under the detection probe, start the test, the microprocessor automatically controls the 400nm, 430nm, 450nm and 500nm LED light sources to turn on one after another, and the filter group is switched to the corresponding filter through the stepping motor control . When each LED is turned on, the fluorescence signal introduced by the fiber under six LED excitations is automatically recorded by the spectrometer.

[0046] (2) Two-dimensional fluorescence correlation spectrum acquisition

[0047] After smoothing and correcting all the collected spectra, select a specific interval (here 620-770nm) for each fluorescent signal excited by LEDs with four different w...

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Abstract

The invention discloses a tea/cosmetics quality detecting method based on two-dimensional correlation spectra. The method comprises the following steps: spectra acquisition comprising the steps of illuminating samples through LED, motivating visible near-infrared reflective spectra or fluorescence spectra of the samples and acquiring; spectrum preprocessing comprising the steps of preprocessing the acquired fluorescence spectra or reflective spectra; two-dimensional correlation spectrum obtaining comprising the steps of selecting feature regions from multiple different sample spectra, and carrying out synchronous correlation or asynchronous correlation calculation, to obtain synchronous spectra or asynchronous spectra; detection model establishment comprising the steps of establishing a sample two-dimensional correlation spectrum and sample level detection evaluation model based on a stoichiometry method; and sample quality detection comprising the steps of acquiring a dynamic spectrum of a new to-be-detected sample, calculating a two-dimensional correlation spectrum, bringing into the detection model, and analyzing to obtain a sample quality detection result. Based on the LED, the improvement on a quality detection system is relatively small, the cost is low, besides, rapid and effective high-precision detection can be satisfied, and the practicability is relatively high.

Description

technical field [0001] The invention relates to a non-destructive and high-precision detection method and system for the quality of tea / cosmetics and the like based on two-dimensional correlation spectrum. The invention belongs to the technical field of optical sensing and the technical field of analysis and testing instruments. Background technique [0002] As a healthy and green drinking food, tea has become one of the three most common and important beverages in the world today. In China, which has a history of drinking tea for thousands of years and is the world's largest supplier of tea, tea is a particularly important food. Consumers' judgment on the quality of tea and the industry's monitoring of the tea processing process have put forward higher and higher requirements. [0003] In recent years, with the development of the market and the improvement of people's living standards, people's pursuit of beauty has been continuously improved. Skin care cosmetics have bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25G01N21/3563G01N21/3577G01N21/64
Inventor 何赛灵董泳江王勇琪
Owner JIANGSU DINGYUN INFORMATION TECH
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