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Method for accurately measuring optical parameters of edible oil

A measurement method and edible oil technology, applied in the direction of color/spectral characteristic measurement, phase influence characteristic measurement, etc., can solve the problems of difficult data processing and cumbersome operation, and achieve convenient experimental operation, avoid test error, and simple and accurate test data processing Effect

Inactive Publication Date: 2010-08-04
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the existing terahertz wave time-domain spectrum measurement experiment of edible oil, the FP effect produced by the far-infrared quartz cuvette and the shortcomings of difficult data processing, and to provide a simple terahertz wave measurement of edible oil optical parameters method

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  • Method for accurately measuring optical parameters of edible oil
  • Method for accurately measuring optical parameters of edible oil
  • Method for accurately measuring optical parameters of edible oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Measuring Optical Parameters of Rice Bran Oil

[0049] The vegetable oil sample is rice bran oil. First, put a 0.8mm thick dry white paper in the sample position of the terahertz wave time-domain spectrum measuring device, and measure the terahertz wave time-domain spectrum when the dry white paper is placed as a reference signal; Put the 0.8mm thick paper sheet soaked in rice bran oil into the sample position of the terahertz time-domain spectrum measuring device, measure the terahertz wave time-domain spectrum of the 0.8mm thick paper sheet soaked in rice bran oil as the sample signal, and obtain the terahertz wave reference signal and sample signals such as Figure 2a shown. Finally use the method described in the present invention to calculate the refractive index and absorption coefficient (such as Figure 2b and Figure 2c Shown), the average refractive index of rice bran oil is 1.481.

Embodiment 2

[0051] Measuring Optical Parameters of Soybean Oil

[0052] The vegetable oil sample is soybean oil. First, put a 0.8mm thick dry white paper in the sample position of the terahertz wave time-domain spectrum measuring device, and measure the terahertz wave time-domain spectrum when the dry white paper is placed as a reference signal; Put the 0.8mm thick paper sheet soaked in soybean oil into the sample position of the terahertz wave time-domain spectrum measuring device, measure the terahertz wave time-domain spectrum of the 0.8mm thick paper sheet soaked in soybean oil as the sample signal, and obtain the terahertz wave Reference signal and sample signal such as Figure 3a shown. Finally, use the method described in the present invention to calculate the refractive index and absorption coefficient (such as Figure 3b and Figure 3c Shown), the average refractive index of soybean oil is 1.484.

Embodiment 3

[0054] Measuring Optical Parameters of Rapeseed Oil

[0055] The vegetable oil sample is rapeseed oil. First, put a 0.8mm thick dry white paper on the sample position of the terahertz wave time-domain spectrum measuring device, and measure the terahertz wave time-domain spectrum when the dry white paper is placed as a reference signal; then Put the 0.8mm thick paper sheet soaked in rapeseed oil in the sample position of the terahertz wave time-domain spectrum measuring device, measure the terahertz wave time-domain spectrum of the 0.8mm thick paper sheet soaked in rapeseed oil as the sample signal, and the obtained Terahertz wave reference signal and sample signal such as Figure 4a shown. Finally use the method described in the present invention to calculate the refractive index and absorption coefficient (such as Figure 4b and Figure 4c Shown), the average refractive index of rapeseed oil is 1.486.

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Abstract

The invention discloses a method for accurately measuring optical parameters of edible oil by using Terahertz time-domain spectroscopy. By using a transmission-type Terahertz time-domain spectroscopy (THz-TDS) device, the THz time domain spectroscopy of dry paper is measured as a reference signal and the THz time domain spectroscopy of the paper immersed in the edible oil is measured as a sample signal, Flourier transform values of the sample signal and the reference signal are calculated, and refractive index and absorption coefficient of the edible oil in Terahertz waveband is obtained by means of the formula. The invention is low in experimental cost and is simple and convenient in operation as well as reduces multiple reflections and FP effect of the THz wave transmitted in a far-infrared quartz cuvette and efficiently improves measurement accuracy of the optical parameters of the edible oil. The method is fast, convenient and accurate and can measure the optical parameters of theedible oil fast and simply, and the invention can provide a detection method for quality assessment and ingredient analysis of the edible oil.

Description

technical field [0001] The invention belongs to the technical field of edible oil quality and component analysis and detection, and relates to a terahertz wave accurate measurement method for optical parameters of edible oil. Background technique [0002] Terahertz (Terahertz or THz) waves usually refer to electromagnetic waves with a frequency in the range of 0.1 to 10 THz. The energy of the photons is about 1 to 10 meV, which is roughly equivalent to the energy of the transition between molecular vibration and rotational energy levels. Most polar molecules such as water molecules and ammonia molecules have a strong absorption of THz radiation, and the transition between the vibrational energy level and rotational energy level of many organic macromolecules (DNA, protein, etc.) is also just in the THz range. Therefore, the THz spectrum (including emission, reflection and transmission spectra) of substances contains rich physical and chemical information, and its absorption ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/41G01N21/31
Inventor 李九生
Owner CHINA JILIANG UNIV
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