System and method for analyzing physical and chemical properties of biochemical feed liquid by using synchronous alternating magnetic flux
Technical Field
The invention particularly relates to a system and a method for analyzing physicochemical characteristics of biochemical feed liquid by using synchronous alternating magnetic flux, belonging to the technical field of food electrical detection.
Background
Food and biochemical feed liquid contain a large amount of charged solutes and thus have conductivity, and according to the induction law, if biochemical feed liquid forms a spiral pipeline as a secondary coil and is introduced with variable magnetic flux, induced voltage is output. In previous researches, a single biochemical feed liquid coil is used for characterizing the salt content of liquid food, and the application field is single.
Disclosure of Invention
Aiming at the problems of expensive equipment (power connection parameters and impedance measurement) and low sensitivity (low conductivity) in the current electrical detection technology, the invention mainly aims to provide a system and a method for analyzing the physicochemical characteristics of biochemical feed liquid by using synchronous alternating magnetic flux so as to overcome the defects of the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention comprises the following steps:
the invention provides a system for analyzing physicochemical characteristics of biochemical feed liquid by using synchronous alternating magnetic flux, which comprises the following components:
the device comprises at least one primary coil and at least two secondary coils, wherein the primary coils and the secondary coils are wound on at least one iron core and matched with each other, each secondary coil is arranged in an interlayer constant-temperature cavity, each secondary coil comprises a spiral pipeline for biochemical feed liquid to flow through and biochemical feed liquid flowing through the spiral pipeline, and at least two spiral pipelines are connected in series;
a power supply at least to provide an excitation voltage to the at least one primary coil;
the device comprises at least one alternating voltage detection device, wherein the voltage detection device is electrically connected with at least two detection electrodes, and the at least two detection electrodes are arranged on different potential test points on a connection section of two spiral pipelines which are mutually connected in series.
In some specific embodiments, two ends of the spiral pipeline are exposed from the interlayer constant-temperature cavity and are respectively used as a feeding hole and a discharging hole, so that biochemical feed liquid forms an open-circuit state in the spiral pipeline;
in some more specific embodiments, the system includes two closed iron cores, a primary coil and a secondary coil are respectively wound on two opposite sides of each closed iron core, the two primary coils are electrically connected with a power supply, and the spiral pipelines in the two secondary coils are connected in series; preferably, the two primary coils are arranged in parallel.
In some more specific embodiments, the system comprises: the two primary coils are respectively wound at two ends of the iron core, the two primary coils are electrically connected with a power supply, and the spiral pipelines in the two secondary coils are mutually connected in series; preferably, the secondary coil is sleeved on the primary coil; preferably, the two primary coils are arranged in parallel
In some specific embodiments, the system includes a closed dual magnetic circuit iron core, the closed dual magnetic circuit iron core is wound with a primary coil and two secondary coils, the two secondary coils are distributed on two sides of the primary coil, the primary coil is electrically connected with a power supply, and the spiral pipelines in the two secondary coils are mutually connected in series.
In some specific embodiments, the operating frequency of the power supply is 1 to 1000 Hz.
In some specific embodiments, the excitation voltage is 0-1000V.
In some more specific embodiments, the turns ratio of the primary coil to the helical tube is 1:1 to 1: 10.
In some specific embodiments, the inner diameter of the spiral pipeline is 1-3 mm.
In some more specific embodiments, the winding direction of the primary coil and/or the secondary coil is clockwise or counterclockwise.
In some specific embodiments, the distance between two adjacent spiral pipelines connected in series is 3-20 cm, preferably 3-15 cm.
In some more specific embodiments, the system further comprises a temperature control unit, wherein the temperature control unit is communicated with the interlayer constant-temperature cavity to form a temperature circulation loop, so that at least the temperature of the interlayer constant-temperature cavity is kept at a constant temperature during measurement; and/or the temperature control unit comprises a constant-temperature circulating water bath unit.
The embodiment of the invention also provides a method for analyzing the physicochemical properties of biochemical feed liquid by using synchronous alternating magnetic flux, which comprises the following steps:
providing the system for analyzing the physicochemical characteristics of the biochemical feed liquid by using the synchronous alternating magnetic flux;
injecting biochemical feed liquid to be detected into the spiral pipe of more than two secondary coils and forming an open circuit state;
providing an excitation voltage of a selected frequency to the primary coil with a power supply and generating a synchronous alternating magnetic flux;
and detecting the potential difference of two different potential test points distributed in a connection interval of two spiral pipelines which are mutually connected in series by using an alternating voltage detection device so as to further detect the physical and chemical characteristic parameters of the biochemical feed liquid.
In some more specific embodiments, the temperature within the isothermal cavity is maintained constant during the detection.
Compared with the prior art, the invention has the advantages that: the biochemical feed liquid double coils under the influence of synchronous magnetic flux are used as output sources of induced voltage, so that a detection system can be set according to physical characteristics of different biochemical feed liquids; the system has the advantages of simple structure, convenience in fitting, high accuracy, good repeatability, high sensitivity and low system cost.
Drawings
FIG. 1 is a system for analyzing the soluble solids content of orange juice in accordance with one embodiment of the present invention;
FIG. 2 is a system for analyzing the fat content of cow's milk according to an embodiment of the present invention;
FIG. 3 is a system for analyzing the degree of substitution of starch according to an embodiment of the present invention;
description of reference numerals: 1-a power supply; 2-a primary coil; 3-an iron core; 4-constant temperature circulating water bath; 5-interlayer constant temperature cavity; 6-connecting a pipeline; 7-a platinum electrode; 8-AC voltmeter.
Detailed Description
In view of the deficiencies in the prior art, the inventors of the present invention have made extensive studies and extensive practices to provide technical solutions of the present invention. The technical solution, its implementation and principles, etc. will be further explained as follows.
The invention provides a system for analyzing physicochemical characteristics of biochemical feed liquid by using synchronous alternating magnetic flux, which comprises the following components:
the device comprises at least one primary coil and at least two secondary coils, wherein the primary coils and the secondary coils are wound on at least one iron core and matched with each other, each secondary coil is arranged in an interlayer constant-temperature cavity, each secondary coil comprises a spiral pipeline for biochemical feed liquid to flow through and biochemical feed liquid flowing through the spiral pipeline, and at least two spiral pipelines are connected in series;
a power supply at least to provide an excitation voltage to the at least one primary coil;
the device comprises at least one alternating voltage detection device, wherein the voltage detection device is electrically connected with at least two detection electrodes, and the at least two detection electrodes are arranged on different potential test points on a connection section of two spiral pipelines which are mutually connected in series.
In some specific embodiments, two ends of the spiral pipeline are exposed from the interlayer constant-temperature cavity and are respectively used as a feeding hole and a discharging hole, so that biochemical feed liquid forms an open-circuit state in the spiral pipeline;
in some more specific embodiments, the system includes two closed iron cores, a primary coil and a secondary coil are respectively wound on two opposite sides of each closed iron core, the two primary coils are electrically connected with a power supply, and the spiral pipelines in the two secondary coils are connected in series; preferably, the two primary coils are arranged in parallel.
In some more specific embodiments, the system comprises: the two primary coils are respectively wound at two ends of the iron core, the two primary coils are electrically connected with a power supply, and the spiral pipelines in the two secondary coils are mutually connected in series; preferably, the secondary coil is sleeved on the primary coil; preferably, the two primary coils are arranged in parallel
In some specific embodiments, the system includes a closed dual magnetic circuit iron core, the closed dual magnetic circuit iron core is wound with a primary coil and two secondary coils, the two secondary coils are distributed on two sides of the primary coil, the primary coil is electrically connected with a power supply, and the spiral pipelines in the two secondary coils are mutually connected in series.
In some specific embodiments, the operating frequency of the power supply is 1 to 1000 Hz.
In some specific embodiments, the excitation voltage is 0-1000V.
In some more specific embodiments, the turns ratio of the primary coil to the helical tube is 1:1 to 1: 10.
In some specific embodiments, the inner diameter of the spiral pipeline is 1-3 mm.
In some more specific embodiments, the winding direction of the primary coil and/or the secondary coil is clockwise or counterclockwise.
In some specific embodiments, the distance between two adjacent spiral pipelines connected in series is 3-20 cm, preferably 3-15 cm.
In some more specific embodiments, the system further comprises a temperature control unit, wherein the temperature control unit is communicated with the interlayer constant-temperature cavity to form a temperature circulation loop, so that at least the temperature of the interlayer constant-temperature cavity is kept at a constant temperature during measurement; and/or the temperature control unit comprises a constant-temperature circulating water bath unit.
The embodiment of the invention also provides a method for analyzing the physicochemical properties of biochemical feed liquid by using synchronous alternating magnetic flux, which comprises the following steps:
providing the system for analyzing the physicochemical characteristics of the biochemical feed liquid by using the synchronous alternating magnetic flux;
injecting biochemical feed liquid to be detected into the spiral pipe of more than two secondary coils and forming an open circuit state;
providing an excitation voltage of a selected frequency to the primary coil with a power supply and generating a synchronous alternating magnetic flux;
and detecting the potential difference of two different potential test points distributed in a connection interval of two spiral pipelines which are mutually connected in series by using an alternating voltage detection device so as to further detect the physical and chemical characteristic parameters of the biochemical feed liquid.
In some more specific embodiments, the temperature within the isothermal cavity is maintained constant during the detection.
The biochemical feed liquid double coils under the influence of synchronous magnetic flux are used as output sources of induced voltage, so that a detection system can be set according to physical characteristics of different biochemical feed liquids; the system is simple in structure, convenient to fit, high in accuracy, good in repeatability, high in sensitivity and low in cost.
The technical solution, the implementation process and the principle thereof will be further explained with reference to the drawings and the specific embodiments.
Example 1
As shown in fig. 1, the system for analyzing the content of soluble solids in orange juice comprises a power supply 1, two primary coils 2, two iron cores 3, a constant-temperature circulating water bath 4, two interlayer constant-temperature cavities 5 (including a spiral pipeline as a secondary coil), a connecting pipeline 6, a platinum electrode 7 and an alternating-current voltmeter 8. Two primary coils 2 in the system are connected with a power supply 1, the primary coils 2 are respectively wound on two same iron cores 3, and spiral pipelines of two same interlayer constant-temperature cavities 5 are respectively wound on the two iron cores 3; wherein the two iron cores 3 are closed single magnetic circuits made of silicon steel and have a square structure, the side length of the axis is 30cm, the thickness of the iron core is 2cm, and the sectional area of the iron core is 4cm2(ii) a The spiral pipelines in the two interlayer constant temperature cavities 5 are connected in series, wherein the distance L between the two secondary coils is 10cm, and the winding directions of the spiral pipelines are clockwise; the two primary coils 2 are 10 turns, the number of turns of the two secondary coils, namely the spiral pipelines, is 20 turns, an orange juice sample to be detected is filled in the spiral pipelines to form an open circuit state, an interlayer sleeve of an interlayer constant-temperature cavity 5 is connected with a constant-temperature circulating water bath 4 to keep the temperature at 25 ℃ during measurement, and the inner diameters of the two spiral pipelines, namely the secondary coils, are 3 mm; an AC voltmeter 8 is connected with the platinum electrode 7, and the platinum electrode 7 is placed on 2 different potential points b and-b on two spiral pipeline intervals L (5 points on L are defined as-a, -b, o, b, a), wherein the distances between the points a, b and-a, -b are all equal3cm, starting the power supply 1, setting the working frequency to be 500Hz and the voltage to be 50V to excite the primary coil 2 and generate synchronous alternating magnetic flux, obtaining corresponding potential difference on two potential test points b and-b of the connecting interval of the two spiral pipelines, wherein the potential difference is linearly related to the soluble solid content of orange juice and can be directly SSC (solid phase sequence) U (solid phase sequence)-bbFitting and analyzing the equation of/5.841 +24.912, SSC represents the soluble solids content in units%; u shape-bbThe potential difference representing the points-b and b, in mV; the soluble solids content of the 10 orange juices was tested as shown in table 1 below.
TABLE 1 orange juice soluble solids content measurement analysis table
It can be seen that the soluble solid content of orange juice cannot be accurately characterized by using the traditional electrical parameter, namely the conductivity, and the characterization can be completed by using the potential difference V of a specific site obtained under the excitation of the synchronous alternating magnetic flux and has high sensitivity.
Example 2
As shown in fig. 2, the system for analyzing the fat content of milk comprises a power supply 1, two primary coils 2, an iron core 3, a constant-temperature circulating water bath 4, two interlayer constant-temperature cavities 5 (including a spiral pipeline as a secondary coil), a connecting pipeline 6, a platinum electrode 7 and an alternating-current voltmeter 8. Two primary coils 2 in the system are connected with a power supply 1, the two primary coils 2 are respectively wound on an iron core 3, and spiral pipelines of two identical interlayer constant-temperature cavities 5 are also wound on the iron core 3; wherein the iron core 3 is a non-closed magnetic circuit made of silicon steel and has a strip structure with a length of 30cm, a thickness of 3cm and a sectional area of 9cm2(ii) a The spiral pipelines of the two interlayer constant temperature cavities 5 are connected in series, the distance L between the two secondary coils is 15cm, the winding directions and the turns of the spiral pipelines are different, one is clockwise, and the number of the turns is 24The other is anticlockwise, the number of turns is 18, the primary coil is 8, a milk sample to be detected is filled in the spiral pipeline to form an open circuit state, an interlayer sleeve of the interlayer constant-temperature cavity 5 is connected with the constant-temperature circulating water bath 4 to keep the temperature at 25 ℃ during measurement, and the inner diameters of the two spiral pipelines, namely the secondary coils, are both 1 mm; an alternating current voltmeter 8 is connected with a platinum electrode 7, the platinum electrode 7 is placed on 2 different potential points b and-b on 2 spiral pipeline intervals L (5 points on L are defined as-a, -b, o, b, a), wherein the distances between the points a, b and-a, -b are respectively 5cm and 3cm, a power supply 1 is started, the working frequency is set to be 700Hz, the voltage is 80V to excite the primary coil 2 and generate synchronous alternating magnetic flux, corresponding potential difference can be obtained on two potential test points b and-b in the connecting interval of the two spiral pipelines, the potential difference is linearly related to the fat content of milk, and FC-U can be directly usedbbFitting and analyzing an equation of/3.868 +22.046, wherein FC represents the fat content of milk in unit%; u shape-bbThe potential difference, in V, representing the points-b and b is measured for 20 milk fat contents as shown in Table 2 below.
TABLE 2 measurement and analysis table for fat content in milk
It can be seen that the soluble solid content of orange juice cannot be accurately characterized by using the traditional electrical parameter, namely the conductivity, and the characterization can be completed by using the potential difference V of a specific site obtained under the excitation of the synchronous alternating magnetic flux and has high sensitivity.
Example 3
As shown in fig. 3, the system for analyzing the degree of substitution of acetate starch includes a power supply 1, a primary coil 2, an iron core 3, a constant temperature circulating water bath 4, an interlayer constant temperature cavity 5 (including a spiral pipeline as a secondary coil), a connecting pipeline 6, a platinum electrode 7, and an ac voltmeter 8. Wherein, the primary coil 2 in the system is connected with the power supply 1, the primary coil 2 is wound on the iron core 3, the spiral pipelines of two identical interlayer constant temperature cavities 5 are also wound on the iron core 3, wherein the iron core 3 is a closed double magnetic circuitThe structure is made of silicon steel, the sizes of 2 windows of the iron core are all consistent, the length is 20cm, the width is 30cm, the thickness of the iron core is 2cm, and the sectional area of the iron core is 4cm2(ii) a The spiral pipes of the two interlayer constant temperature cavities 5 are connected in series, the distance L is 8cm, the winding directions of the spiral pipelines are different, one is clockwise and has 24 turns, and the other is anticlockwise and has 24 turns; the primary coil has 10 turns; mixing an acetate starch sample to be detected with deionized water according to a solid-to-liquid ratio of 1: 30(w/v), stirring, and pouring into a spiral pipeline to form an open circuit state, wherein an interlayer sleeve of an interlayer constant-temperature cavity 5 is connected with a constant-temperature circulating water bath 4 to keep the temperature at 25 ℃ during measurement, and the inner diameters of two spiral pipelines, namely secondary coils, are 2 mm; an alternating current voltmeter 8 is connected with a platinum electrode 7, the platinum electrode 7 is placed on 2 different potential points b and-b on two spiral pipeline intervals L (5 points on L are defined as-a, -b, o, b, a), wherein the distances between the points a, b and-a, -b are respectively 2cm and 2cm, a power supply 1 is started, the working frequency is set to be 100Hz, the voltage is 20V to excite the primary coil 2 and generate synchronous alternating magnetic flux, corresponding potential difference can be obtained on two potential test points b and-b in the connecting interval of the two spiral pipelines, the potential difference is linearly related to the substitution degree of the acetate starch, and DS-U can be directly used-bbFitting and analyzing the equation of/122.160-1.395, wherein DS represents the degree of substitution; u shape-bbThe potential difference representing the points-b and b, in mV; the degree of substitution of 10 acetate starches was measured as shown in table 3 below.
TABLE 3 measurement and analysis table for degree of substitution of acetate starch
It can be seen that the degree of substitution of the acetate starch cannot be accurately characterized if the dielectric constant of 1MHz is adopted, and the characterization can be completed by utilizing the potential difference V of a specific site obtained under the excitation of synchronous alternating magnetic flux and the sensitivity is high.
It should be understood that the above-mentioned embodiments are merely illustrative of the technical concepts and features of the present invention, which are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and therefore, the protection scope of the present invention is not limited thereby. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.