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Quick near-infrared measuring device and method for milk ingredients

A measuring device and near-infrared technology, which is applied in the field of near-infrared spectral analysis, can solve the problems of unsatisfactory field use, high power consumption, and large volume, and achieve the effects of fast measurement speed, low power consumption, and small volume

Inactive Publication Date: 2012-05-02
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned instruments are desktop instruments with large volume and high power consumption, which cannot meet the requirements of on-site use

Method used

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  • Quick near-infrared measuring device and method for milk ingredients
  • Quick near-infrared measuring device and method for milk ingredients
  • Quick near-infrared measuring device and method for milk ingredients

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Based on the near-infrared milk composition rapid analysis instrument of the present invention, its hardware structure principle block diagram is as follows figure 1 shown. The invention adopts diffuse transmission near-infrared spectroscopy, is based on LED monochromatic light source in the short-wave near-infrared region, silicon photodiode is used as a detector, and an ARM microprocessor is used as a core to form a near-infrared milk component rapid analysis instrument. The hardware part of the instrument is composed of constant current drive unit, LED component unit, sample cell unit, photoelectric detection unit, signal processing and control unit, man-machine interface unit and other parts.

[0034] The constant current driving unit is composed of a digital / analog converter, a voltage / current conversion circuit, a mirror constant current source, a multi-way switch, a digital interface circuit and the like connected in sequence. Among them, the digital / analog conv...

Embodiment 2

[0042] figure 2 It is a flow chart of the rapid analysis method for the main components of diffuse transmission near-infrared milk in the embodiment of the present invention, see figure 2 , the method includes:

[0043] Step A. Place the empty sample cell in the measurement chamber, cover the hood, and press the "OK" button to switch. The 16 LEDs will emit light in sequence according to the constant current of different sizes, and irradiate the sample cell. The light signal passing through the sample cell It is received by a photodetector and converted into an electrical signal. After signal processing, the instrument collects blank spectral information at 16 wavelengths.

[0044] Step B. Put the homogenized milk sample of unknown composition into the sample cell, then place the sample cell in the measurement room, cover the hood, press the "OK" button to switch, and the 16 LEDs will be in accordance with the blank measurement. The constant current emits light sequentiall...

Embodiment 3

[0057] The establishment of the chemometric prediction model (PLS prediction model) in the technical solution of the present invention will be described in detail.

[0058] 89 commercially available milk samples of different brands and batches were selected. Among them, the protein content ranges from 1.01 to 3.57, with an average value of 2.91, the fat content ranges from 1.17 to 4.00, with an average value of 2.82, and the lactose content ranges from 1.41 to 5.13, with an average value of 4.26.

[0059] The main components of 89 milk samples were determined by the national standard method as a reference. Among them, the standard value of fat is measured by the Geber method, the standard value of protein is measured by the Kjeldahl method, and the standard value of lactose is measured by the Rhine-Enon method.

[0060] At the same time, the spectral data of these samples were measured at a temperature of 40° C. and an empty sample cell as a reference condition. 20 samples w...

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Abstract

The invention provides a quick near-infrared measuring device and method for milk ingredients and relates to the technical field of near-infrared spectroscopic analysis. The device comprises a constant current driving unit, an LED (Light Emitting Diode) component unit, a sample pool unit, a photoelectric detection unit, a signal processing and control unit, a man-machine interface unit, and the like. A diffuse transmission measuring mode is adopted, sample absorbance values of sixteen short-wave near-infrared absorbing wavelengths are utilized and a prediction model in the device is used, thereby simultaneously measuring the indexes in the milk, such as fat, protein, milk sugar, non-fat milk solid, total milk solid, water, and the like. The quick near-infrared measuring device has the advantages that sixteen short-wave near-infrared absorbing wavelengths are used for quickly measuring the main ingredients of milk, thereby being small in data volume, high in measuring speed and suitable for on-site application. The device is small in volume, low in power consumption, light in weight and convenient in carrying, thereby being capable of meeting the requirement for quickly on-site analyzing the main ingredients of a milk sample.

Description

technical field [0001] The invention relates to the technical field of near-infrared spectrum analysis, and belongs to a method and an instrument for rapidly analyzing milk components by using limited absorption wavelength points. Background technique [0002] Accurate and rapid analysis of milk components is of great significance in the breeding and screening of fine varieties of dairy cows, the acquisition of milk raw materials, production and processing, and commodity circulation. It not only provides scientific guidance for the breeding of dairy cows, but also provides real data for product quality management, finished product quality control, and product quality monitoring, and it is also convenient for industrial and commercial personnel to discover fake and inferior products in time and crack down on illegal activities of counterfeiting and selling , to ensure food safety and safeguard the interests of consumers. [0003] Traditional milk composition analysis uses an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/35G01N21/3577G01N21/359
Inventor 曹彦波王兴华费强宋大千于爱民
Owner JILIN UNIV
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