CN100520403C - Food corrosion determiner - Google Patents
Food corrosion determiner Download PDFInfo
- Publication number
- CN100520403C CN100520403C CNB2004100916156A CN200410091615A CN100520403C CN 100520403 C CN100520403 C CN 100520403C CN B2004100916156 A CNB2004100916156 A CN B2004100916156A CN 200410091615 A CN200410091615 A CN 200410091615A CN 100520403 C CN100520403 C CN 100520403C
- Authority
- CN
- China
- Prior art keywords
- mentioned
- food
- value
- corrosion
- electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
A confirming device of food corrosion consists of tray for placing food, contact detector for contacting food and detecting its pH value, pH detecting unit for comparing pH value detected out by contact detector to set standard pH value for obtaining potential difference to detect food corrosion degree pH, control unit for controlling to switch on / off external indication lamp according to detected out corrosion degree.
Description
Technical field
The present invention relates to a kind of food corrosion determiner, particularly relate to a kind of passing through and measure food pH, the ion concentration difference is changed over Electromotive Difference Of Potential, and utilize above-mentioned difference to confirm the food corrosion determiner of food corrosion situation.
Background technology
Usually, various food such as livestock products or dairy products according to circulation or storage method difference, As time goes on, can produce corrosion in various degree after making.Since according to the kind of food, all indicated circulation time limit or storage life, even therefore corrode food faster, also can only be according to the freshness of circulation time limit or pot-life affirmation food.
That is, the consumer can only judge the freshness of food according to build date and circulation pot-life.
So, do not consider the preservation state of food or other factors etc., indicate the method for circulation pot-life without exception and have following drawback.That is, even circulation and the bad product of preservation state are to be in the circulation storage life, also corrode, edible (drinking) can health risk.In contrast, even the good food of preservation state is to have passed through the circulation storage life, also keep freshness and edible, but have to usually discard.
Particularly, during the meat corrosion, red yellowish pink can become green, brown, grey etc., distributes unpleasant peculiar smell, and its surface also produces stickum.
As above the corrosion of meat is just can understand after proceeding to a certain degree.Initial stage is not if possess special utensil or equipment, with the human degree of carrying out of feeling to be difficult to pick out corrosion.And, in order to use osmesthesia, need directly to hear peculiar smell, directly influence user's mood.
In order to solve above-mentioned drawback, have at the special conventional art that proposed patent for 2003-0096077 number of Korean Patent communique special 2000-0042126 number and Korean Patent communique.
Above-mentioned Korean Patent communique is special to be for 2000-0042126 number food when being corroded, and the ammonia gas that produces from the food of corrosion with the perceptron perception is to the corrosion of user prompt inner matter.
Foregoing invention, but obviously need the great number perceptron of perception ammonia gas.And, have only the space of food storing, extent of corrosion that just can accuracy of judgement in sealing.And food is stored in the storage space that the user uses at any time usually, so can't stop the omission of ammonia gas.Therefore, a perception can't be confirmed extent of corrosion accurately from the ammonia gas that food produces.
In addition, the invention of special 2003-0096077 number of above-mentioned Korean Patent communique relates to is to utilize quality state according to food to produce the minimum activity pH of different microorganisms (meat is pseudomonad) etc.That is, utilize the transparent/translucent metamorphosis of the above-mentioned pH susceptibility polymer substance that produces in the pH of above-mentioned pH susceptibility polymer confrontation ionization difference owing to sensitivity response, whether to the corrosion of user prompt food.
; above-mentioned technology possesses ion and solvent barrel and hole in order to make ion in the food and solvent be contacted with above-mentioned pH susceptibility polymer substance; and be in contact with one another by above-mentioned hole; thereby realized ionization or break away from son by ion and solvent; constitute the PH susceptibility material filling bed of transparent/translucent metamorphosis, so that ion and solvent in the food contact with above-mentioned pH susceptibility polymer substance.Thereupon, become big drawback with producing system bulk.
And, when producing pH susceptibility polymer substance, by pH susceptibility batch methane chloride and N, the variations such as mole ratios of N-DMAA, transparency is exerted an influence, thereby adjust the substance reaction ratio and during according to the pH scope of above-mentioned ratio, it is big that error range can become.
That is, use pH paper or indicator, have following drawback: have certain limitation on the accuracy of indicator itself, and be difficult to detect and be with look or dark experiment material according to the method for pH degree detecting change color.Thereupon, be difficult to accurately confirm the extent of corrosion of food.
This shows that above-mentioned existing food corrosion determiner obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem that food corrosion determiner exists, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.
Because the defective that above-mentioned existing food corrosion determiner exists, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, and the utilization of cooperation scientific principle, actively studied innovation, in the hope of founding a kind of food corrosion determiner of new structure, can improve general existing food corrosion determiner, make it have more practicality.Through constantly research, design, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.
Summary of the invention
Fundamental purpose of the present invention is, overcome the defective that existing food corrosion determiner exists, and provide a kind of food corrosion determiner of new structure, technical matters to be solved is to make it with the naked eye understand the freshness that is circulating or preserving product immediately by display, thereby be suitable for practicality more, and have the value on the industry.
Another object of the present invention is to, a kind of food corrosion determiner is provided, technical matters to be solved is to make its pH that utilizes food, by potential difference measurement according to electromotive force difference, and more accurate understanding food corrosion degree, thus be suitable for practicality more.
The object of the invention to solve the technical problems realizes by the following technical solutions.According to a kind of food corrosion determiner that the present invention proposes, it comprises: the flat flat dish that can put food; Be formed at above-mentioned dish top, directly contact, detect the contact detector of the food pH value that changes according to the quality state with food; Utilization is by the pH value of above-mentioned contact detector check and set potential difference (PD) between the pH standard value, checks the pH test section of the extent of corrosion of food; According to extent of corrosion, control the open/close control part of outside pilot lamp by above-mentioned pH test section check.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid food corrosion determiner, it also comprises: externally select to put food variety on dish by the user, and set the outside input part of pH standard value by above-mentioned control part setting.
Aforesaid food corrosion determiner, a connecting line of described contact detector and above-mentioned pH test section constitutes crooked curve or a certain at least form in the whirlpool shape form.
Aforesaid food corrosion determiner, at least 2 connecting lines of described contact detector and above-mentioned pH test section constitute ＂ ㄈ ＂ or ＂
The curve of ＂ shape bending, be parallel to each other and a certain at least form in the form that forms according to given interval.
Aforesaid food corrosion determiner, wherein said pH test section comprises: amplify the high input amplifier of output by the pH value of above-mentioned contact detector check; Detection is by the pH detecting electrode portion of the pH value of above-mentioned high input amplifier amplification; The electronic electrode part of prior storage standard pH value; The pH value that utilization is detected by above-mentioned pH detecting electrode portion and by the pH value of above-mentioned electronic electrode part setting converts the pH difference to Electromotive Difference Of Potential and estimates the potential difference (PD) estimation portion of potential difference (PD).
Aforesaid food corrosion determiner, it also comprises: the connecting line between above-mentioned pH test section and the above-mentioned contact detector is 2 when above, only give by maximum value from the food pH value of each contact detector check, and get rid of remaining contact detector.
Aforesaid food corrosion determiner, wherein said electronic electrode part are the standard pH values that stores different food products in advance, and are set at the standard pH value of this food by the outside input part that is connected in above-mentioned control part.
Aforesaid food corrosion determiner, wherein said potential difference (PD) estimation portion comprises: built-inly make the first electrolytical internal buffer of cognitive pH value with glass-film; Be built in above-mentioned internal buffer outside formation separate space and the second electrolytical external buffer of cognitive pH value; Be stored in first electrolyte in the above-mentioned internal buffer, link to each other, receive the pH electrode of first electrode of the pH value generation that detects by above-mentioned pH detecting electrode portion with above-mentioned pH detecting electrode portion; Be stored in second electrolyte in the said external impact damper, link to each other, receive the external perimysium reference electrode of second electrode of the standard pH value generation that stores by above-mentioned electronic electrode part with above-mentioned electronic electrode part; Utilize said external phase buffer internal gas pressure or oil pressure, change the diaphragm of above-mentioned second electrolyte displacement; By first electrode, second electrode that results from above-mentioned pH detecting electrode portion and electronic electrode part respectively, detect the voltage table of the potential difference (PD) that produces between two electrode part.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, in order to reach aforementioned goal of the invention, major technique of the present invention thes contents are as follows:
The present invention proposes a kind of food corrosion determiner, and it comprises: the flat flat dish that can put food; Be formed at above-mentioned dish top, directly contact, the contact detector of the food pH value that changes according to the quality state-detection with food; Utilization is by the pH value of above-mentioned contact detector check and set potential difference (PD) between the pH standard value, checks the pH test section of the extent of corrosion of food; According to extent of corrosion, control the open/close control part of outside pilot lamp by above-mentioned pH test section check.
Meanwhile, preferentially, the present invention also will comprise: select to be placed in food variety on the dish outside by the user, and set the outside input part of pH standard value by above-mentioned control part setting.
At this moment, preferentially, above-mentioned contact detector should constitute ＂ ㄈ ＂ or ＂
In the form that the curve of ＂ shape bending, whirlpool shape and a plurality of connecting line form according to the mutual balance in given interval, a certain at least form.
And preferentially, above-mentioned pH test section should comprise: amplify the high input amplifier of output by the pH value of above-mentioned contact detector check; Detect the pH detecting electrode portion that is exaggerated the pH value by above-mentioned high input amplifier; The electronic electrode part of prior storage standard pH value; PH value that utilization detects from above-mentioned pH detecting electrode portion and the pH value that is provided with by above-mentioned electronic electrode part change over electromotive force with the pH difference, estimate the potential difference (PD) estimation portion of potential difference (PD).
In addition, preferentially, the present invention also will comprise: and the connecting line between the above-mentioned contact detector is 2 when above, only gives the value by maximum from the food pH value of each contact detector check, and gets rid of remaining comparator.
Preferentially, above-mentioned electronic electrode part should store the standard pH value of different food products in advance, and is arranged to the standard pH value of this food by outside input part.
In addition, preferentially, above-mentioned potential difference (PD) estimation portion should comprise: built-inly make the first electrolytical internal buffer of cognitive pH value with glass-film; Be built in above-mentioned internal buffer outside formation separate space and the second electrolytical external buffer of cognitive pH value; Be stored in first electrolyte in the above-mentioned internal buffer, link to each other, receive the pH electrode of first electrode of the pH value generation that detects by above-mentioned pH detecting electrode portion with above-mentioned pH detecting electrode portion; Be stored in second electrolyte in the said external impact damper, link to each other, receive the external perimysium reference electrode of second electrode of the standard pH value generation that stores by above-mentioned electronic electrode part with above-mentioned electronic electrode part; Utilize said external impact damper internal gas pressure or oil pressure, change the diaphragm of above-mentioned second electrolyte displacement; By first electrode, second electrode that results from above-mentioned pH detecting electrode portion and electronic electrode part respectively, detect the voltage table of the potential difference (PD) that produces between two electrode part.
By technique scheme, food corrosion determiner of the present invention has following advantage at least:
1, can not be subjected to circulation time limit constraint dated in the food, but, make the user judge whether more accurately and can use by checking out the accurate quality state of food.
2, utilize the pH of food, detect, can confirm more accurately whether food corrodes by potential difference (PD) according to Electromotive Difference Of Potential.
3, utilize by the device of pH test section, can confirm more accurately whether food corrodes, for the user provides more reliable food corrosion determiner with Electromotive Difference Of Potential perception pH difference.
In sum, the food corrosion determiner of special construction of the present invention, it has above-mentioned many advantages and practical value, and in like product, do not see have similar structural design to publish or use and really genus innovation, no matter it structurally or bigger improvement all arranged on the function, have large improvement technically, and produced handy and practical effect, and more existing food corrosion determiner has the multinomial effect of enhancement, thereby be suitable for practicality more, and have the extensive value of industry, really be a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, below with preferred embodiment of the present invention and conjunction with figs. describe in detail as after.
The specific embodiment of the present invention is provided in detail by following examples and accompanying drawing thereof.
Description of drawings
Fig. 1 is according to food corrosion determiner synoptic diagram of the present invention.
Fig. 2 (a) (b) (c) is according in the food corrosion determiner of the present invention, the shape embodiment of contact detector.
Fig. 3 is according in the food corrosion determiner of the present invention, pH test section structural representation.
Fig. 4 is according in the food corrosion determiner of the present invention, the concrete synoptic diagram of potential difference (PD) estimation portion.
Fig. 5 is according in the food corrosion device of the present invention, the circuit type synoptic diagram of pH test section.
Fig. 6 to Figure 21 is the concrete synoptic diagram with pH test section in the circuit displayed map 5.
10: internal buffer 20: external buffer
30:pH electrode 40: external perimysium reference electrode
50: diaphragm 100: dish
200: contact detector 300:pH test section
310: comparator 320: high input amplifier
330:pH measures electrode part 340: electronic electrode part
350: potential difference (PD) estimation portion 400: control part
500: pilot lamp 510: indicator light switch
600: outside input part
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to its embodiment of food corrosion determiner, structure, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.
Seeing also shown in Figure 1ly, is according to food corrosion determiner synoptic diagram of the present invention.Food corrosion determiner comprises: the flat flat dish 100 that can put food; Be formed at above-mentioned dish 100 tops, directly contact, detect the contact detector 200 of the food pH value that changes according to the quality thermodynamic state verification with food; Utilization is by the pH value of above-mentioned contact detector 200 checks and set potential difference (PD) between the pH standard value, checks the pH test section 300 of the extent of corrosion of food; According to extent of corrosion, control the open/close control part 400 of outside pilot lamp by above-mentioned pH test section 300 checks.
In addition, the present invention also comprises: by the user, externally select to put in the outside input part 600 of the food variety of dish.
At this moment, above-mentioned contact detector 200 can constitute with pH test section 300 have a connecting line as Fig. 1 bending curve or as Fig. 2 (a) whirlpool shape.
And, also can have more than 2 and test section between connecting line, that is, and as Fig. 2 (b) above ＂ ㄈ ＂ or ＂
＂ shape bending curve, perhaps as a plurality of connecting lines of Fig. 2 (c) with the formation that is parallel to each other of given interval.
Form above-mentioned contact detector 200 by as above structure, above-mentioned contact detector 200 has bigger space than above-mentioned dish 100 tops, and can widen and put the contact area between the food on the dish 100.Therefore, can detect the food pH value of putting on above-mentioned dish 100 more accurately.At this moment, above-mentioned contact detector 200 is to form with glass electrode.
Seeing also shown in Figure 3ly, is according in the food corrosion determiner of the present invention, pH test section structural representation.
Above-mentioned pH test section 300 is as shown in Figure 3, comprises: comparator 310, high input amplifier 320, pH detecting electrode portion 330, electronic electrode part 340 and potential difference (PD) estimation portion 350.
At this moment, above-mentioned comparator 310 is used in and contacts connecting line between the detection portion 200 and reach 2 when above, and only gives the value by maximum in the food pH value of each contact detector 200 checks, gets rid of remaining.That be because, food is according to different parts, corrosion and degree thereof are also inequality, the pH value checked out of each position also is not quite similar thus.Given this, should utilize the most serious position of extent of corrosion during detection.
In addition, above-mentioned high input amplifier 320 is the input values of amplifying by contact detector 200 checks, and outputs to pH detecting electrode portion 330, thereby impels above-mentioned pH detecting electrode portion 330 to detect data value more accurately.
And above-mentioned electronic electrode part 340 is the definition according to the designer, has the standard pH value of different food products respectively.If the user selects certain food by outside input part 600, will become corresponding food standard pH value according to the control setting of control part 400.
Above-mentioned potential difference (PD) estimation portion 350 utilizes the pH value that detected by above-mentioned pH detecting electrode portion 330 and by the pH value of above-mentioned electronic electrode part 340 settings, the pH difference is changed over electromotive force and estimates potential difference (PD).
As follows, with reference to accompanying drawing, describe operational process in detail according to food corrosion determiner of the present invention.
At first, the user will confirm that the food of extent of corrosion is placed on the dish 100 that forms contact detector 200, select the kind of different food products by outside input part 600.
At this moment, the kind of different food products is divided into: milk class, meat, greengrocery, rice, can class, soup class and edible wild herbs class etc.So, control part is with selecteed different food products standard pH value electronic electrode part 340 to be set by the said external input part.
Here, above-mentioned pH is meant the common logarithm for hydrionic molar concentration inverse, also is the acid and alkaline detection unit of solution, and its equation is as follows.
[equation 1]
PH=-log
10(hydrionic concentration)=-log
10(hydrionic activity)
=-log
10(hydrionic concentration x enlivens coefficient)
That is, pseudomonad is the microorganism of corrosion meat, and its minimum activity is 5.6, will be defined as 5.6 according to the pH standard value of meat corrosion in electronic electrode part.And, in 25 ℃ the pure water, IS10
7Molecular separation become H
+And OH
-, cause hydrogen ion (H
+) concentration be IS10
7, the pH standard value reaches 7 thus.
Therefore, above-mentioned electronic electrode part 340 is provided with pH standard value according to various food during manufacturing.If the user selects to put food in dish by outside input part 600, control part 400 is controlled, so that be arranged at electronic electrode part 340 according to the pH standard value of above-mentioned selected food.
Meanwhile, except above-mentioned different food products kind, for the more weak user of infant, pregnant woman or immunity, extent of corrosion is very slight, also can cause fatal harm to health.Therefore, the upper, middle and lower of adjusting extent of corrosion is divided into the upper, middle and lower key, makes the additional selection of user wherein a kind of, thereby can adjust the extent of corrosion of food in more detail.
In addition, the food that is placed on the above-mentioned dish is to touch 2 above contact detectors 200, thereby checks out the pH value of this food according to the different parts of food by each contact detector 200.
So, the food pH value that detects respectively by above-mentioned 2 above contact detectors 200 is to select a wherein maximum value of pH value by 310 of comparators.And above-mentioned selecteed pH value is to output to pH detecting electrode portion 330 by the value that high input amplifier 320 is amplified to more than 2 times.
Then, potential difference (PD) estimation portion 350 utilizes the pH value that detects from above-mentioned pH detecting electrode portion 330 and by the pH value of above-mentioned electronic electrode part 340 settings, converts the pH difference to Electromotive Difference Of Potential, thus the potential difference (PD) of estimating.
More particularly, above-mentioned potential difference (PD) estimation portion 350 is as shown in Figure 4, makes with glass-film, and it comprises: the internal buffer 10 of built-in first electrolyte (B); Be formed at above-mentioned internal buffer 10 exterior angles, the external buffer 20 of built-in second electrolyte (A); Be stored in first electrolyte (B) in the above-mentioned internal buffer 10, link to each other with above-mentioned pH detecting electrode portion 330, thus receive by above-mentioned pH detecting electrode portion 330 the pH electrode 30 of first electrode of the pH value that detects generation; Be stored in second electrolyte (A) in the said external impact damper 20, be connected, thereby reception is by the external perimysium reference electrode 40 of second electrode of above-mentioned electronic electrode part 340 stored standard pH values generations with above-mentioned electronic electrode part 340; Utilize pneumatics or oil pressure in the said external impact damper 20, change the diaphragm 50 of above-mentioned second electrolyte (A) displacement; By first electrode, second electrode that produces respectively by above-mentioned pH electrode 30 and external perimysium reference electrode 40, detect the voltage table (not shown) of potential difference (PD) between two electrodes.
As mentioned above, above-mentioned potential difference (PD) estimation portion 350 is 10 li of internal buffers that the solvent B (first electrolyte) with cognitive pH value is put into glass-film institute container made, and soaks Ph electrode 30 in above-mentioned solvent B.And said vesse external buffer 20 is put into the solvent orange 2 A (second electrolyte) of cognitive internal pH-values too, and soaks external perimysium reference electrode 40 at above-mentioned solvent orange 2 A.
At this moment, the structure of above-mentioned potential difference (PD) estimation portion 350 is as shown in Figure 4, has constituted internal buffer 10 walls and has formed the pH combined electrode structure of external buffer 20, but also can form to be separated by the pH electrode structure that forms alone to set a distance.
So, potential difference (PD) estimation portion 350 forms with the pH combined electrode structure.First electrode, second electrode by being produced respectively by above-mentioned pH electrode 30 and external perimysium reference electrode 40 produce potential difference (PD) between two electrodes.Voltage table is by detecting above-mentioned potential difference (PD), checking out potential difference (PD) by the electromotive force that produces between two electrodes.
That is, be pHi with the pH value defined of above-mentioned pH electrode 30 checks, when the food pH value defined that is arranged at said external normal electrode 40 is pHx, can adjust potential difference (PD) E by equation 2 by 350 estimations of above-mentioned potential difference (PD) estimation portion.
[equation 2]
E＝a(pHi-pHx)
At this moment, a=2,303[RT/F]
In addition, if the characteristic of above-mentioned two electrodes 30,40 is only to change potential value according to hydrionic concentration, we also can recognize the pH value of solvent from the potential difference (PD) between two electrodes.
Fig. 5 is according in the food corrosion device of the present invention, the circuit type synoptic diagram of pH test section, and it shows the pH test section basic circuit diagram of being made up of operational amplifier.
With reference to Fig. 5, when specifying circuit diagram, the operational amplifier that is used in pH test section 300 of the present invention has the structure identical with Fig. 6.Said structure is meant v
+(noninverting input) required voltage and v
-The difference of (anti-phase input) required voltage is amplified to the G (10 of amplification degree
5| 10
6) doubly export.
Here, G is not a high precision numerical value, but so long as high value all can.This has become the reason of operational amplifier low cost of manufacture.For above-mentioned operational amplifier being used in accurate amplifying circuit, as shown in Figure 7, should possess feedback arrangement.
If possess feedback arrangement as shown in Figure 7, can start to output y equals Nx, have the amplifier of accurate amplification degree.At this, voltage divider 700 is as shown in Figure 8, utilizes impedance and forms.
That is, above-mentioned voltage dispenser 700 is as shown in Figure 8, and when impedance R1 was connected side by side with R2, if the input voltage of R2 end is V1, the input voltage of R1 end was 0V, can obtain the voltage of V2 as follows.
The electric current of R1 and R2 is,
Here, if R1=R2, just can form as
÷ 2 circuit.Therefore, by the conversion of R1 and R2, can form the ÷ N of other ratio.
Can utilize above-mentioned impedance according to as shown in Figure 9, the voltage dispenser is combined with operational amplifier.
At this moment,
If substitution mutually can be obtained:
As mentioned above, except accurate enlarging function, the characteristic of operational amplifier is as follows.
1) the noninverting input of operational amplifier and anti-phase input are to be the part of sense voltage, the different abnormal currents of its terminal.People are referred to as the input impedance height.
2) voltage that is produced by the output of operational amplifier is unimpeded how many abnormal currents, also can not change.It is low that people are referred to as input impedance.
When 3) operational amplifier normally started by feedback mechanism, voltage difference should be below tens of μ V between noninverting input and the anti-phase input.That is, when input voltage is number V, if G
-10
5, will obtain
At this moment, see-saw circuit will have the structure as Figure 10.
If at said structure input Vin voltage, by feedback mechanism, will with V
+%V
-Equate.
If utilize foregoing, can obtain whole amplification degree.
The end input Vin voltage of R1, the other end then links to each other with the anti-phase input of operational amplifier.This voltage is identical with noninverting input voltage 0V, and the voltage of Vin is then imported at the two ends of R1.
Hence one can see that, and the electric current I of R1 is
The input terminal of operational amplifier is fully by any electric current, and therefore above-mentioned electric current is by R2, and the current i by R2 with
Equate.And the voltage that is input to the R2 two ends will become
At this moment, Vout is that the end terminal voltage of R2 links to each other with the anti-phase input of operational amplifier and has 0V, can obtain thus:
In addition, non-inverting amplifier has the structure as Figure 11.In the said structure, by feedback mechanism, the voltage of noninverting input and anti-phase input will equate, and all have Vin.At this moment, the voltage that is input to the R1 two ends is Vin, and will become by the electric current I of R1 circulation
Here, by any electric current, this electric current is not only to pass through R2 to the input terminal of operational amplifier.Therefore, the voltage that is input to the R2 two ends will become
At this moment, Vout is the voltage sum that is input to R1 and R2 two ends, can obtain thus:
Here, if form the circuit that R2 equals 0, will show circuit as Figure 12.
According to as Figure 12 circuit mode, because Vout equates that with Vin the amplification degree will become 1., the input terminal of operational amplifier is any electric current (50pA is following) that do not circulate fully, therefore can detect the voltage by the very little charge generation that equates with the pH electrode.
If at the pH electrode by detecting voltage in the electric current, as Figure 13 (a) (b) shown in, will reduce the quantity of electric charge that produces between the barrier film, voltage reduced and approach 0.
, if utilize operational amplifier, circulating current and detect voltage not, as Figure 13 (c) (d) shown in, can not consume the electronics between the barrier film and accurately detect voltage.According to pH, can obtain equation 3.
[equation 3]
Utilize above-mentioned principle, can directly make the pH test section.
When being specified by embodiment, if the pH value is 7, the voltage of being exported by high input amplifier is not 0V just.At this moment, above-mentioned voltage should be adjusted into 0V.That is when more high or low than pH7, carries out with identical ratio and amplifies.
Figure 14 is for the voltage that will put w is adjusted into 0V, comprises the circuit diagram that uses variableimpedance.At this moment, can obtain the voltage of a z according to following equation 4.
[equation 4]
Thereupon, if simplify circuit among Figure 14, can show Figure 15.
According to Figure 15, can obtain the voltage of a w according to following equation 5.
[equation 5]
Therefore, be adjusted into 0V, should adjust variableimpedance, so that become in order to put w
The time y value
Figure 16 is as mentioned above during pH7, is adjusted into the final synoptic diagram of circuit of 0V.
When being specified,, can be adjusted to 0V from check point 1 if when the pH detecting electrode is dipped in the pH7 buffer solvent rotation and adjusts variableimpedance 1 with reference to Figure 16.
So, for the circuit that is adjusted into 0V from pH7 has the voltage that meets other pH, as shown in figure 17, should adjust degree of tilt.If utilize negative circuit to reformulate this figure, just can form Figure 18.
At this moment, negative circuit is to utilize
Than adjusting the amplification degree, therefore can adjust the amplification degree by adjusting the value of R1.In the impedance structure of R1, forming in the 1k on variableimpedance top Ω impedance is that R1 becomes 0V, thereby stops that globality amplification degree infinitely enlarges.
So finish circuit, can detect the voltage that changes according to pH from check point 2 by multimeter.For the ease of understanding, show 0.7V in the time of can being arranged to pH7, show 0.4V during pH4.Therefore need as Figure 19 circuit.
Negative circuit is as shown in figure 19, can form the circuit that also comprises 2 voltage V1, V1 '.If foregoing circuit is applicable to Figure 18, can form structure as Figure 20.
Figure 20 circuit is to adjust degree of tilt by adjusting variableimpedance 2, and adjusts as shown in figure 21 the whole ratio of pH specific output voltage by adjusting variableimpedance 3.
In sum, pH test section 300 will possess as Fig. 5 final integral circuit diagram.Therefore, can understand the pH value of solvent from the potential difference (PD) between two electrodes.
At this moment, all resistance values that do not show in Fig. 5 are 56k Ω, and all variable-impedance value that do not show are 50k Ω.
At last, if the food pH value of control part 400 by 350 checks of above-mentioned potential difference (PD) estimation portion surpasses the pH standard value that is arranged at electronic electrode part 340, control indicator light switch 510 and pass through pilot lamp 500 is to the corrosion of user prompt food.
The technological innovation of the food corrosion determiner of the present invention that above-mentioned structure like this constitutes all has many saving graces for technician of the same trade now, and the progressive that possesses skills really.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (8)
1, a kind of food corrosion determiner is characterized in that comprising:
Can put the flat flat dish of food;
Be formed at above-mentioned dish top, directly contact, detect the contact detector of the food pH value that changes according to the quality state with food;
Utilization is by the pH value of above-mentioned contact detector check and set potential difference (PD) between the pH standard value, checks the pH test section of the extent of corrosion of food;
According to extent of corrosion, control the open/close control part of outside pilot lamp by above-mentioned pH test section check.
2, food corrosion determiner according to claim 1 is characterized in that it also comprises: externally select to put food variety on dish by the user, and set the outside input part of pH standard value by above-mentioned control part setting.
3, food corrosion determiner according to claim 1 is characterized in that a connecting line of described contact detector and above-mentioned pH test section constitutes crooked curve or a certain at least form in the whirlpool shape form.
4, food corrosion determiner according to claim 1 is characterized in that at least 2 connecting lines of described contact detector and above-mentioned pH test section constitute ＂ ㄈ ＂ or ＂
The curve of ＂ shape bending, be parallel to each other and a certain at least form in the form that forms according to given interval.
5, food corrosion determiner according to claim 1 is characterized in that above-mentioned pH test section comprises: amplify the high input amplifier of output by the pH value of above-mentioned contact detector check; Detection is by the pH detecting electrode portion of the pH value of above-mentioned high input amplifier amplification; The electronic electrode part of prior storage standard pH value; The pH value that utilization is detected by above-mentioned pH detecting electrode portion and by the pH value of above-mentioned electronic electrode part setting converts the pH difference to Electromotive Difference Of Potential and estimates the potential difference (PD) estimation portion of potential difference (PD).
6, food corrosion determiner according to claim 5, it is characterized in that wherein also comprising: the connecting line between above-mentioned pH test section and the above-mentioned contact detector is 2 when above, only give by maximum value from the food pH value of each contact detector check, and get rid of remaining contact detector.
7, food corrosion determiner according to claim 5 is characterized in that wherein said electronic electrode part is the standard pH value that stores different food products in advance, and is set at the standard pH value of this food by the outside input part that is connected in above-mentioned control part.
8, food corrosion determiner according to claim 5 is characterized in that wherein said potential difference (PD) estimation portion comprises:
Built-in with glass-film making, the first electrolytical internal buffer of cognitive pH value;
Be built in above-mentioned internal buffer outside formation separate space and the second electrolytical external buffer of cognitive pH value;
Be stored in first electrolyte in the above-mentioned internal buffer, link to each other, receive the pH electrode of first electrode of the pH value generation that detects by above-mentioned pH detecting electrode portion with above-mentioned pH detecting electrode portion;
Be stored in second electrolyte in the said external impact damper, link to each other, receive the external perimysium reference electrode of second electrode of the standard pH value generation that stores by above-mentioned electronic electrode part with above-mentioned electronic electrode part;
Utilize said external phase buffer internal gas pressure or oil pressure, change the diaphragm of above-mentioned second electrolyte displacement;
By first electrode, second electrode that results from above-mentioned pH detecting electrode portion and electronic electrode part respectively, detect the voltage table of the potential difference (PD) that produces between two electrode part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100916156A CN100520403C (en) | 2004-11-24 | 2004-11-24 | Food corrosion determiner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100916156A CN100520403C (en) | 2004-11-24 | 2004-11-24 | Food corrosion determiner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1779437A CN1779437A (en) | 2006-05-31 |
| CN100520403C true CN100520403C (en) | 2009-07-29 |
Family
ID=36769842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100916156A Expired - Fee Related CN100520403C (en) | 2004-11-24 | 2004-11-24 | Food corrosion determiner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100520403C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872350B (en) * | 2017-04-17 | 2019-05-10 | 武汉大学 | Feed rod Corrosion monitoring analogy method in deep-well type direct current grounding pole concrete structure |
| CN113984835A (en) * | 2021-10-14 | 2022-01-28 | 江苏农林职业技术学院 | Packaging can for monitoring food quality in real time and monitoring method |
-
2004
- 2004-11-24 CN CNB2004100916156A patent/CN100520403C/en not_active Expired - Fee Related
Non-Patent Citations (6)
| Title |
|---|
| 注水白条肉鸡新鲜度的检验. 张曼茹，邵明东，候继勇，任萍，王力群，孙志敏，徐永恒.肉品卫生，第9（总183期）期. 1999 |
| 注水白条肉鸡新鲜度的检验. 张曼茹，邵明东，候继勇，任萍，王力群，孙志敏，徐永恒.肉品卫生，第9（总183期）期. 1999 * |
| 测定牛肉pH值对其新鲜度判定应用研究. 韩晓雷，杨增.黑龙江畜牧科技，第3期. 1998 |
| 测定牛肉pH值对其新鲜度判定应用研究. 韩晓雷，杨增.黑龙江畜牧科技，第3期. 1998 * |
| 肉在鲜腐过程中pH值变动的规律性. 高士昌，张颖.中国兽医杂志，第20卷第11期. 1994 |
| 肉在鲜腐过程中pH值变动的规律性. 高士昌，张颖.中国兽医杂志，第20卷第11期. 1994 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1779437A (en) | 2006-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100749318B1 (en) | Apparatus for optimum water-quality test and notice for water-supply course and the method for the same | |
| Gil-Sánchez et al. | A novel humid electronic nose combined with an electronic tongue for assessing deterioration of wine | |
| Das et al. | A low cost instrumentation system to analyze different types of milk adulteration | |
| JP2008175819A (en) | Salinity sensor using ion conductivity, and salinity measuring system and method | |
| CN102053109A (en) | Electronic tongue sensor array and method for controlling quality of beverage products | |
| JP7112134B2 (en) | BIOGAS DETECTION DEVICE, METHOD, AND PROGRAM | |
| CN100520403C (en) | Food corrosion determiner | |
| KR102517270B1 (en) | Electronic device and controlling method thereof | |
| CN101206219B (en) | Test fluid measurement device and sensitivity calibration method thereof | |
| CN104089987A (en) | Portable frozen beef product quality detection device and detection method using the same | |
| US5872454A (en) | Calibration procedure that improves accuracy of electrolytic conductivity measurement systems | |
| CN110161221A (en) | Analyte detects instrument and associated method of use | |
| JP2016001126A (en) | Bio-gas detection device, method, and program | |
| US5987964A (en) | Apparatus and method for detecting gas and vapor | |
| KR100539567B1 (en) | apparatus for checking rottenness of food | |
| CN104089989A (en) | Device and method for edible oil quality detection | |
| US4168220A (en) | Method for detecting the fouling of a membrane covered electrochemical cell | |
| US20080283399A1 (en) | Potentiometric process analytic sensor with isolated temperature sensor | |
| KR100571260B1 (en) | Kimchi Tong, Refrigerator and Method for Measuring Kimchi Ripening Using It | |
| CN212622536U (en) | Water quality tester | |
| KR100518039B1 (en) | Determination of taste and aroma using multiple array sensors | |
| US9097653B2 (en) | Electrochemical detection of beta-lactoglobulin | |
| KR100596972B1 (en) | Intelligent food decomposition detecting system and the way how to detect based on it | |
| TWI567387B (en) | Examination method for detecting abnormal property of electrochemical test strip | |
| CN114525655B (en) | Liquid level detection device and control method of detergent box and washing machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: TAIZHOU LG ELECTRONICS FREEZER CO., LTD. Free format text: FORMER OWNER: LG ELECTRONICS ( TIANJIN ) ELECTRICAL APPLIANCES CO., LTD. Effective date: 20100108 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20100108 Address after: Yingbin Road, Taizhou Economic Development Zone, No. 2 Patentee after: Taizhou LG Electronics Refrigerator Co., Ltd. Address before: Beichen District, Tianjin Xing Lake Road Patentee before: LG Electronic (Tianjin) Electrical Appliance Co., Ltd. |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090729 Termination date: 20111124 |