CN109916962A - A kind of Portable meat moisture content detection device and its detection method - Google Patents
A kind of Portable meat moisture content detection device and its detection method Download PDFInfo
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Abstract
The present invention relates to a kind of Portable meat moisture content detection device and its detection method, which includes sampling system and detector；Sampling system includes sampler tray and is fixed on orthogonal cross probe electrode and soda acid sensor on sampler tray；Constant-current source is connect with cross probe electrode, and output size is constant, the periodically variable electric current in direction；The voltage signal of cross probe electrode acquisition is transferred to detector；In detector, voltage signal amplifies through voltage amplifier circuit, then is transferred to microcontroller after converter analog-to-digital conversion；The pH value of soda acid sensor acquisition is transferred directly to microcontroller；Microcontroller searches the table of comparisons according to the pH value that voltage signal, soda acid sensor acquire and obtains the moisture content of fresh meat.The present invention can be accurate, reliable, quick and easily detects fresh meat moisture.
Description
Technical field
The invention belongs to fresh meat technical field of water detection, relevant to moisture content more particularly to a kind of application resistance
The device and its detection method that principle detects fresh meat moisture.
Background technique
The method examined both at home and abroad for fresh meat moisture at present mainly has oven drying method, capacitance method and electric-resistivity method etc..
And electric-resistivity method is using a kind of more measurement method.Its principle is to contain using Ohm's law electric-resistivity method to measure the moisture of meat
Amount.The sampling of fresh meat is as a resistance, and when moisture is high, resistance is small, and when moisture is low, resistance is big, fresh by detecting
The resistance sizes of meat can detect the moisture value of fresh meat.But due to different geographical, different cultivars, the slaughter time is not
Same factor, so that the pH-value of moisture is different in fresh meat, this directly influences amount of ions in fresh meat
How much, it results in and is different by the water cut value that the resistance of the fresh meat of acquisition obtains, this is that moisture content is caused to be surveyed
One of the systematic error of amount process；And temperature also has large effect for the accuracy of resistance measurement, this is to lead to moisture content
Another systematic error in measurement process.Therefore, if the pH value and temperature to sample pass through electric-resistivity method institute without amendment
Obtained aqueous rate score will generate biggish error, and the storage and transport for fresh meat all have significant effect.Institute
It is compensated and corrected with carrying out the relevant parameters such as soda acid, temperature, is essential step.
Summary of the invention
The invention solves a technical problem be to provide a kind of Portable meat moisture content detection device, which can
Effectively solve because of pH value difference bring system detection error.
In order to solve the above-mentioned technical problem, Portable meat moisture content detection device of the invention includes: sampling system and inspection
Survey instrument；The sampling system includes that sampler tray is sensed with orthogonal cross probe electrode and soda acid on sampler tray is fixed on
Device；A pair of of sample electrodes are made of in cross probe electrode A electrode and B electrode, C electrode and D electrode constitute a pair of of sample electrodes；
Soda acid sensor is between C electrode and D electrode；One end connection A electrode and C electrode of constant-current source, the other end connect B electrode with
D electrode；Constant-current source output size is constant, the periodically variable electric current in direction；Detector includes voltage amplifier circuit, converter
And microcontroller；The output of cross probe electrode is connected to voltage amplifier circuit, and the output of voltage amplifier circuit passes through AD conversion
Device is connected to the data input pin of microcontroller；The output of soda acid sensor is directly connected to the data input pin of microcontroller；
The voltage signal that sampling system 1 acquires amplifies through voltage amplifier circuit, then is transferred to microcontroller after converter analog-to-digital conversion
Device；Microcontroller searches the table of comparisons according to the pH value that voltage signal, soda acid sensor acquire and obtains the moisture content of fresh meat.
Further, the invention also includes multiplex electronics；The output of cross probe electrode passes through multiplex electronics point
High-moisture amplifying circuit, intermediate moisture amplifying circuit and the low moisture amplifying circuit not being connected in voltage amplifier circuit；Gao Shui
The output of amplifying circuit, intermediate moisture amplifying circuit and low moisture amplifying circuit is divided to be connected to converter.
Further, the invention also includes temperature sensors；Temperature sensor be fixed on sampler tray A electrode and B electrode it
Between, and the output of temperature sensor is connected to the data input pin of microcontroller；Microcontroller is sensed according to voltage signal, soda acid
The pH value of device acquisition and the temperature value of temperature sensor acquisition export the moisture content of corresponding fresh meat.
The invention solves another technical problem be using above-mentioned Portable meat moisture content detection device to meat into
The method of row water content detection, this method are as follows:
1) sampling system is contacted with sample, cross probe electrode, temperature sensor and soda acid sensor are inserted
Enter in sample；
2), using the pH value of soda acid sensor measurement sample, while temperature sensor measurement sample is utilized
Temperature value；Then closure first switch first is passed through that size is constant, and the periodically variable electric current in direction is obtained to A electrode, B electrode
To a series of voltage value；It is then powered off first switch, closure second switch is passed through size constant, direction week to C electrode and D electrode
The electric current of phase property variation, obtains a series of voltage value；
3), microcontroller is averaged to by the amplified voltage signal of voltage amplifier circuit；It is flat according to voltage signal
Mean value, temperature value and pH value search the table of comparisons and obtain corresponding moisture content.
The scaling method of the functional relation of voltage value, pH value and moisture content is as follows in the table of comparisons:
One, nominal voltage-moisture content functional relation:
(1), the fresh meat of muti-piece of known different water cut is got out as sample；
(2), sampling system is contacted with first piece of sample, by cross probe electrode, temperature sensor and soda acid
Sensor is inserted into first piece of sample, records the voltage signal sampling value of first piece of sample；Similarly by sampling system
It is contacted with other samples, acquires corresponding voltage signal sampling value；Obtain a series of moisture content and corresponding voltage signal
Sampled value；
(3) microcontroller fitting obtains corresponding relationship formula (1) between voltage signal sampling value V and moisture content M；
V=f (M) (1)
(4) microcontroller show that the function between voltage signal sampling value V and moisture content M closes using the fitting of Origin software
It is formula (2)；
M=a0+a1V (2)
Wherein a0、a1To be fitted obtained coefficient；
Two, pH value-voltage corresponding relationship is demarcated:
(1), the fresh meat of muti-piece of known aqueous rate is got out as sample, is successively infused in each piece of sample
Enter the acid solution or aqueous slkali of inequality, so that the pH value of each sample changed in gradient, pH value gradient≤1；It will be tested
Sample places a period of time in closed space, so that the pH value in every piece of sample everywhere is identical；It is examined later with meat PH
Instrument is surveyed to measure the pH value of every piece of sample, mark；
(2), sampling system is contacted with first piece of sample, by cross probe electrode, temperature sensor and soda acid
Sensor is inserted into first piece of sample, records the voltage signal sampling value of first piece of sample；Similarly by sampling system
It is contacted with other samples, acquires corresponding voltage signal sampling value；Finally obtain a series of pH values and corresponding voltage letter
Number sampled value；
(3), the corresponding relationship formula (3) between voltage signal sampling value V and pH value is obtained using microcontroller fitting；
V=f (PH) (3)
Three, the corresponding relationship formula (3) utilized is modified formula (1) to obtain the corresponding relationship formula for containing PH compensation term
(4)；
V=f (M)+f (PH)； (4)
Using the Origin software of microcontroller fit moisture content M and voltage signal sampling value V, the letter between pH value
Number relational expression (5)；
M=b0+b1V+b2PH (5)
Four, the corresponding relationship of temperature-voltage signal is demarcated:
(1), the sample of known aqueous rate and pH value is previously heated to set temperature, by sampling system and detected sample
Product contact, cross probe electrode, temperature sensor and soda acid sensor are inserted into sample, the electricity of sample is recorded
Press signal sampling value；T≤3 ° temperature value every decline △ T, △ of temperature sensor output；Record temperature value and corresponding voltage letter
Number sampled value；Until temperature drops to room temperature；Obtain series of temperature value and corresponding voltage signal sampling value；
(2), the corresponding relationship formula (6) of temperature T and voltage signal is fitted using microcontroller；
V=f (T) (6)
Five, formula (4) is modified to obtain using formula (6) and contains the corresponding pass of temperature-compensating item and PH compensation term
It is formula (7)；
V=f (M)+f (PH)+f (T) (7)
(4), according to functional relation (7), fitted using the Origin software of microcontroller comprising temperature-compensating item and
The moisture content M of PH compensation term and voltage signal sampling value function relational expression (8)；
M=c0+c1V+c2PH+c3T (8)
Beneficial effects of the present invention:
The present invention is using the principle that functional relation is presented contained in meat between moisture and its resistance and by measurement two
Voltage between sample electrodes to measure the water content of meat indirectly, to measure the moisture content of meat；It is sensed according to soda acid
Meat pH value, the temperature value that device, temperature sensor acquire compensate sampled voltage, correct, and it is aqueous to improve fresh meat
The detection accuracy of rate；The Position Design for acquiring the two pairs of electrodes on disk can be efficiently against each of the voltage measurement of fresh meat
Anisotropy, can it is accurate, reliable, detect quickly and easily fresh meat moisture.
Detailed description of the invention
Fig. 1 is the structural block diagram of Portable meat moisture content detection device of the invention.
Fig. 2 is sampling system main view.
Fig. 3 is sampling system perspective view.
Fig. 4 is the electric current timing diagram by electrode.
Specific embodiment
Below in conjunction with attached drawing and specific embodiment, the present invention is described further.
As shown in Figure 1, Portable meat moisture content detection device of the invention includes: sampling system 1 and detector 2.
As shown in Figure 2,3, the sampling system 1 includes sampler tray 11 and the cross probe electricity being fixed on sampler tray 11
Pole, temperature sensor 16 and soda acid sensor 17；Sampler tray 11 uses circular discs；Cross probe electrode is by A electrode 12, B electricity
Pole 13, C electrode 14, D electrode 15 form, and four electrodes are arranged in the diameter both ends of two orthogonal disks, wherein A
Electrode 12 and B electrode 13 constitute a pair of of sample electrodes, and C electrode 14 and D electrode 15 constitute a pair of of sample electrodes；Temperature sensor 16
Using K-type thermocouple, which is located at the center of 13 place circular arc of A electrode 12 and B electrode, is used for test sample temperature
Degree；Soda acid sensor 17 is located at the center of 15 place circular arc of C electrode 14 and D electrode；PH value for test sample.Constant-current source
One end connection A electrode 12 and C electrode 14 of I, the other end connect B electrode 13 and D electrode 15；Constant-current source I output size is constant, side
To periodically variable electric current.
Detector 2 includes multiplex electronics, voltage amplifier circuit, and converter, microcontroller, display, operation are pressed
Key, printing equipment.Wherein, voltage amplifier circuit includes three amplification branches, and respectively high-moisture amplifying circuit, intermediate moisture is put
Big circuit and low moisture amplifying circuit；Multiplex electronics use multiple selector, A electrode 12, B electrode 13, C electrode 14 and D
Electrode 15 is connected with high-moisture amplifying circuit, intermediate moisture amplifying circuit and low moisture amplifying circuit respectively by multiplex electronics
It connects；Multiplex electronics are used to select corresponding amplification branch to amplify voltage signal according to moisture height, believe voltage
Number always in the higher voltage range of acquisition precision, it can manually select, can also be automatically selected by microcontroller；It is high
Moisture amplifying circuit, intermediate moisture amplifying circuit and low moisture amplifying circuit are connect by converter with microcontroller；AD turns
Parallel operation is used to voltage analog signal being converted to digital signal；Temperature sensor 16 and soda acid sensor 17 are directly and microcontroller
Connection；Microcontroller uses single-chip microcontroller, can substantially judge voltage range according to the voltage at each pair of sample electrodes both ends and select
Corresponding amplification branch amplifies the voltage of acquisition, to improve acquisition precision；It is average according to the voltage signal being calculated
Value, temperature value and pH value, obtain corresponding moisture content by searching for the mode of the table of comparisons；Display, for showing fresh meat
Moisture content, number and acquisition time；Operation button, for sending operational order to microcontroller；Printing equipment, for printing
In real time, the moisture content of the fresh meat stored.
The method of meat water content detection is specific as follows:
1), sampling system 1 is contacted with sample, i.e., by A electrode 12, B electrode 13, C electrode 14, D electrode 15, temperature
Sensor 16 and soda acid sensor 17 are inserted into sample, and are allowed to well contact with sample；
2) pH value of sample, measurement used time 60s or so, are measured using soda acid sensor 17, while being passed using temperature
The temperature value of the measurement sample of sensor 16；Then the first closure switch K1 first is passed through size not to A electrode 12, B electrode 13
Become, the periodically variable electric current in direction obtains a series of voltage value；It is then powered off first switch K1, is closed second switch K2
It is passed through that size is constant, and the periodically variable electric current in direction obtains a series of voltage value, electric current timing to C electrode 14 and D electrode 15
As shown in Figure 4；
3), microcontroller is averaged to by the amplified voltage signal of voltage amplifier circuit；It is flat according to voltage signal
Mean value, temperature value and pH value search the table of comparisons and obtain corresponding moisture content.
The corresponding relationship needs calibration in advance of voltage, temperature, pH value and moisture content in the table of comparisons.Scaling method is as follows:
(1), it gets out the fresh meat of muti-piece of known different water cut M in advance as sample；
(2), sampling system 1 is contacted with first piece of sample, i.e., by A electrode 12, B electrode 13, C electrode 14, D electrode
15, temperature sensor 16 and soda acid sensor 17 are inserted into first piece of sample, and are allowed to good with first piece of sample
Good contact, records the voltage signal sampling value of first piece of sample；Similarly sampling system 1 is contacted with other samples,
Acquire corresponding voltage signal sampling value；Finally obtain a series of moisture content M and corresponding voltage signal sampling value；
(3) microcontroller fitting obtains corresponding relationship formula (1) between voltage signal sampling value V and moisture content M；
V=f (M) (1)
(4) microcontroller using the fitting of Origin software obtains function between voltage signal sampling value and moisture content M
Relational expression (2)；
M=a0+a1V (2)
Wherein a0、a1To be fitted obtained coefficient；
The functional relation of the moisture content M and voltage signal sampling value should also contain pH value compensation term.It is tested fresh meat
Moisture content and the pH value of fresh meat, the functional relation of voltage signal sampling value scaling method it is as follows:
(1), it gets out the fresh meat of muti-piece of known aqueous rate M in advance as sample, successively in each piece of detected sample
The acid solution or aqueous slkali of inequality are injected in product, so that the pH value of each sample changed in gradient, pH value gradient≤1；
Sample is placed on closed space and places a period of time, so that the pH value in every piece of sample everywhere is identical；Later
The pH value of every piece of sample is measured with accurate meat PH detector, is marked；
(2), sampling system 1 is contacted with first piece of sample, i.e., by A electrode 12, B electrode 13, C electrode 14, D electrode
15, temperature sensor 16 and soda acid sensor 17 are inserted into first piece of sample, and are allowed to good with first piece of sample
Good contact, records the voltage signal sampling value of first piece of sample；Similarly sampling system 1 is contacted with other samples,
Acquire corresponding voltage signal sampling value；Finally obtain a series of pH values and corresponding voltage signal sampling value；
(3), the corresponding relationship formula (3) between voltage signal acquisition value V and pH value is obtained using microcontroller fitting；
V=f (PH) (3)
(4), the corresponding relationship formula (3) utilized is modified to obtain to formula (1) contains the corresponding relationship of PH compensation term
Formula (4)；
V=f (M)+f (PH)； (4)
5, using the Origin software of microcontroller fit moisture content M and voltage signal sampling value, between pH value
Functional relation (5)；
M=b0+b1V+b2PH (5)
The functional relation of the moisture content M and voltage signal acquisition value should also contain temperature-compensating item, include temperature-compensating
And PH compensation term moisture content M and voltage signal sampling value function relational expression preparation method it is as follows:
(1), the sample of known aqueous rate M and pH value are previously heated to 40 degree, by sampling system 1 and sample
A electrode 12, B electrode 13, C electrode 14, D electrode 15, temperature sensor 16 and soda acid sensor 17 are inserted into tested by contact
In sample, the voltage signal sampling value of sample is recorded；Every decline △ T, the △ T of temperature value that temperature sensor 16 exports≤
3°；Record temperature value and corresponding voltage signal sampling value；Until temperature drops to room temperature；Obtain series of temperature value and correspondence
Voltage signal sampling value；
(2), the corresponding relationship formula (6) of temperature T and voltage signal is fitted using microcontroller；
V=f (T) (6)
(3), formula (4) is modified to obtain using formula (6) and contains the correspondence of temperature-compensating item and PH compensation term
Relational expression (7)；
V=f (M)+f (PH)+f (T) (7)
(4), according to functional relation (7), fitted using the Origin software of microcontroller comprising temperature-compensating item and
The moisture content M of PH compensation term and voltage signal sampling value function relational expression；
M=c0+c1V+c2PH+c3T (8)。
Claims (4)
1. a kind of Portable meat moisture content detection device, characterized by comprising: sampling system (1) and detector (2)；Described
Sampling system (1) includes sampler tray (11) and is fixed on orthogonal cross probe electrode and soda acid sensing on sampler tray (11)
Device (17)；A pair of of sample electrodes, C electrode (14) and D electrode are made of in cross probe electrode A electrode (12) and B electrode (13)
(15) a pair of of sample electrodes are constituted；Soda acid sensor (17) is located between C electrode (14) and D electrode (15)；The one of constant-current source (I)
End connection A electrode (12) and C electrode (14), the other end connect B electrode (13) and D electrode (15)；Constant-current source (I) output size is not
Become, the periodically variable electric current in direction；Detector (2) includes voltage amplifier circuit, converter and microcontroller；Cross probe
The output of electrode is connected to voltage amplifier circuit, and the output of voltage amplifier circuit is connected to the number of microcontroller by converter
According to input terminal；The output of soda acid sensor (17) is directly connected to the data input pin of microcontroller；Sampling system (1) acquisition
Voltage signal amplifies through voltage amplifier circuit, then is transferred to microcontroller after converter analog-to-digital conversion；Microcontroller according to
The pH value that voltage signal, soda acid sensor acquire searches the table of comparisons and obtains the moisture content of fresh meat.
2. Portable meat moisture content detection device according to claim 1, it is characterised in that further include multiplex electronics；
High-moisture amplifying circuit that the output of cross probe electrode is connected respectively in voltage amplifier circuit by multiplex electronics, in
Between moisture amplifying circuit and low moisture amplifying circuit；High-moisture amplifying circuit, intermediate moisture amplifying circuit and low moisture amplification electricity
The output on road is connected to converter.
3. Portable meat moisture content detection device according to claim 1, it is characterised in that further include temperature sensor
(16)；Temperature sensor (16) is fixed on sampler tray (11) between A electrode (12) and B electrode (13), and temperature sensor
(16) output is connected to the data input pin of microcontroller；The PH that microcontroller is acquired according to voltage signal, soda acid sensor
Value and the temperature value of temperature sensor acquisition export the moisture content of corresponding fresh meat.
4. a kind of side for carrying out water content detection to meat using Portable meat moisture content detection device as claimed in claim 3
Method, it is characterised in that include the following steps:
1) sampling system (1) is contacted with sample, cross probe electrode, temperature sensor (16) and soda acid are sensed
Device (17) is inserted into sample；
2), using the pH value of soda acid sensor (17) measurement sample, while detected sample is measured using temperature sensor (16)
The temperature value of product；Then closure first switch (K1) first to A electrode (12), B electrode (13) is passed through size constant, the direction period
Property variation electric current, obtain a series of voltage value；It is then powered off first switch (K1), is closed second switch (K2) to C electrode
(14) and D electrode (15) is passed through that size is constant, and the periodically variable electric current in direction obtains a series of voltage value；
3), microcontroller is averaged to by the amplified voltage signal of voltage amplifier circuit；According to voltage signal average value,
Temperature value and pH value search the table of comparisons and obtain corresponding moisture content；
The scaling method of the functional relation of voltage value, pH value and moisture content is as follows in the table of comparisons:
One, nominal voltage-moisture content functional relation:
(1), the fresh meat of muti-piece of known different water cut is got out as sample；
(2), sampling system (1) is contacted with first piece of sample, by cross probe electrode, temperature sensor (16) and acid
Alkali sensor (17) is inserted into first piece of sample, records the voltage signal sampling value of first piece of sample；It will similarly adopt
Sample system (1) is contacted with other samples, acquires corresponding voltage signal sampling value；Obtain a series of moisture content and corresponding
Voltage signal sampling value；
(3) microcontroller fitting obtains corresponding relationship formula (1) between voltage signal sampling value V and moisture content M；
V=f (M) (1)
(4) microcontroller obtains the functional relation between voltage signal sampling value V and moisture content M using the fitting of Origin software
(2)；
M=a0+a1V (2)
Wherein a0、a1To be fitted obtained coefficient；
Two, pH value-voltage corresponding relationship is demarcated:
(1), the fresh meat of muti-piece of known aqueous rate is got out as sample, is successively injected not in each piece of sample
The acid solution or aqueous slkali of equivalent, so that the pH value of each sample changed in gradient, pH value gradient≤1；By sample
A period of time is placed in closed space, so that the pH value in every piece of sample everywhere is identical；Meat PH detector is used later
The pH value of every piece of sample is measured, is marked；
(2), sampling system (1) is contacted with first piece of sample, by cross probe electrode, temperature sensor (16) and acid
Alkali sensor (17) is inserted into first piece of sample, records the voltage signal sampling value of first piece of sample；It will similarly adopt
Sample system (1) is contacted with other samples, acquires corresponding voltage signal sampling value；Finally obtain a series of pH values and correspondence
Voltage signal sampling value；
(3), the corresponding relationship formula (3) between voltage signal sampling value V and pH value is obtained using microcontroller fitting；
V=f (PH) (3)
Three, the corresponding relationship formula (3) utilized is modified formula (1) to obtain the corresponding relationship formula (4) for containing PH compensation term；
V=f (M)+f (PH)； (4)
Using the Origin software of microcontroller fit moisture content M and voltage signal sampling value V, the function between pH value closes
It is formula (5)；
M=b0+b1V+b2PH (5)
Four, the corresponding relationship of temperature-voltage signal is demarcated:
(1), the sample of known aqueous rate and pH value is previously heated to set temperature, by sampling system (1) and detected sample
Product contact, cross probe electrode, temperature sensor (16) and soda acid sensor (17) are inserted into sample, and record is tested
The voltage signal sampling value of sample；T≤3 ° temperature value every decline △ T, △ of temperature sensor (16) output；Record temperature value and
Corresponding voltage signal sampling value；Until temperature drops to room temperature；Obtain series of temperature value and corresponding voltage signal sampling
Value；
(2), the corresponding relationship formula (6) of temperature T and voltage signal is fitted using microcontroller；
V=f (T) (6)
Five, formula (4) is modified to obtain using formula (6) and contains the corresponding relationship formula of temperature-compensating item and PH compensation term
(7)；
V=f (M)+f (PH)+f (T) (7)
(4), it according to functional relation (7), is fitted using the Origin software of microcontroller comprising temperature-compensating item and PH benefit
Repay item moisture content M and voltage signal sampling value function relational expression (8)；
M=c0+c1V+c2PH+c3T (8)。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110632335A (en) * | 2019-10-12 | 2019-12-31 | 吉林省农业科学院 | Full-automatic system for batch determination of pH value |
| CN114137037A (en) * | 2020-09-03 | 2022-03-04 | 横河电机株式会社 | Measuring device |
-
2019
- 2019-04-16 CN CN201910302463.6A patent/CN109916962A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110632335A (en) * | 2019-10-12 | 2019-12-31 | 吉林省农业科学院 | Full-automatic system for batch determination of pH value |
| CN114137037A (en) * | 2020-09-03 | 2022-03-04 | 横河电机株式会社 | Measuring device |
| CN114137037B (en) * | 2020-09-03 | 2024-06-07 | 横河电机株式会社 | Measuring device |
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