Oil product electrode capable of simultaneously detecting temperature and capacitance and application thereof

Abstract

The invention provides an oil product electrode capable of simultaneously detecting temperature and capacitance and application thereof, the oil product electrode comprises an electrode substrate, the substrate is provided with a conduction through hole, and the front surface of the substrate is provided with a front surface electrode area (2) and front surface electrode pins (1); a back electrode area (4) and back electrode pins (3) are arranged on the back of the substrate; the upper ends of the front electrode pins (1) and the upper ends of the back electrode pins (3) are provided with the conduction through holes at the same positions. And the front electrode region (2) and the back electrode region (4) are also modified with electrode protection layers.

Description

Technical Field

[0001] The invention belongs to the field of electrochemical sensors and relates to an oil electrode capable of simultaneously detecting temperature and capacitance and application thereof. Background Art

[0002] Food safety has always been one of the issues that has attracted much attention. Unsafe food may cause food poisoning, foodborne diseases and other health problems, posing serious health risks and economic burdens to individuals and society.

[0003] The quality of cooking oil is crucial to our health. Substandard cooking oil may contain harmful substances such as heavy metals, pesticide residues, genetically modified ingredients, etc., which pose potential risks to human health. In addition, the quality of cooking oil is also related to the taste, texture and cooking effect of food.

[0004] In commercial cooking, frying oil is often reused to save costs. However, with repeated heating of the oil and the accumulation of food residues, the frying oil will undergo oxidation, decomposition and the production of harmful substances. Repeatedly used frying oil may accumulate excessive amounts of harmful substances such as saturated fatty acids, trans-fatty acids and free radicals, including trans-fatty acids, aldehydes, ketones and free radicals. They are believed to be closely related to health problems such as cardiovascular disease and inflammatory diseases. In addition, carcinogens such as polycyclic aromatic hydrocarbons are produced during the repeated heating and use of oil. These substances are closely related to the occurrence of cancer, and long-term intake may increase the risk of cancer. At the same time, repeatedly used frying oil will lead to a decrease in the nutritional value of food. The calories and fat-soluble vitamins in the oil may gradually degrade during the use of the oil, thereby reducing the nutritional content of the food, affecting the taste and quality of the food, and making it more greasy, bitter or discolored.

[0005] Therefore, finding means to accurately detect multiple indicators in edible oils in real time, such as acid value, peroxide value, oxidative stability, fatty acid composition, etc., to evaluate the quality of edible oils and ensure their safety and quality is an urgent need that needs to be addressed in the field of food safety.

[0006] At present, most of the detection methods for frying oil in my country are traditional chemical methods. However, these methods must be operated by laboratory professionals, which is time-consuming and laborious. The use of chemical reagents may harm the health of the testers, and the experimental chemical waste will pollute the environment. Therefore, a fast, accurate and efficient edible oil rapid tester is the best tool for daily rapid testing. By configuring the appropriate core sensor components, it can effectively evaluate the quality, freshness and food safety-related indicators of edible oil.

[0007] The sensor chip is the core component of the sensor. To improve the overall stability and sensitivity of the sensor, the performance of the sensor chip must be improved. Therefore, the performance of the sensor chip largely determines the specific performance of the edible oil rapid detection instrument on the market. Considering the detection environment of edible oil, detection electrodes that are adapted to high temperature environments and have precision, stability and sufficient service life are required. Conventional screen-printed electrodes or gold-plated electrodes cannot be used in high temperature environments or have insufficient service life. In addition, they are not designed for the requirements of oil detection indicators and cannot meet the needs of oil detection.

[0008] Based on the above situation, this patent aims to provide a high-precision, high-stability oil detection electrode that can meet the needs of high-temperature oil detection. Summary of the invention

[0009] In summary, the present invention provides an oil electrode capable of simultaneously detecting temperature and capacitance and its application.

[0010] The purpose of the present invention is to provide an oil product electrode capable of simultaneously detecting temperature and capacitance, comprising an electrode substrate, the substrate being provided with a conductive through hole, the front side of the substrate being provided with a front electrode region (2) and a front electrode pin (1); the back side of the substrate being provided with a back electrode region (4) and a back electrode pin (3); the front electrode pin (1) and the back electrode pin (3) being provided with a conductive through hole at the same position; and the front electrode region (2) and the back electrode region (4) being further modified with an electrode protective layer.

[0011] The front electrode pins (1) include a first electrode pin (11), a second electrode pin (12), a third electrode pin (13) and a fourth electrode pin (14); the back electrode pins (3) include a fifth electrode pin (31), a sixth electrode pin (32), a seventh electrode pin (33) and an eighth electrode pin (34).

[0012] As attached Figure 1 and attached Figure 2 Shown are the front and back schematic diagrams of the oil electrode that can simultaneously detect temperature and capacitance.

[0013] The front electrode region (2) is provided with a front electrode layer, the front electrode layer comprises a first electrode layer (21) and a second electrode layer (22), and is respectively connected to the first electrode pin (11) and the second electrode pin (12); the back electrode region (4) is provided with a back electrode layer, the back electrode layer comprises a third electrode layer (41) and a fourth electrode layer (42), and is respectively connected to the sixth electrode pin (32) and the seventh electrode pin (33).

[0014] Furthermore, the upper end of the first electrode layer (21) and the upper end of the second electrode layer (22) are provided with interdigitated strips that are parallel and equidistant from each other, and the interdigitated strips of the first electrode layer (21) are arranged in the gaps between the interdigitated strips of the second electrode layer (22) and have the same spacing distance.

[0015] Furthermore, a metal electrode layer is provided at the upper end of the third electrode layer (41), and the fourth electrode layer (42) is provided on the side of the third electrode layer (41); a connecting circuit (43) is provided between the third electrode layer (41) and the fourth electrode layer (42), and a resistance paste is coated on the surface of the connecting circuit.

[0016] The front electrode is provided with four electrode pins, wherein the first electrode pin (11) and the second electrode pin (12) are respectively connected to the first electrode layer (21) and the second electrode layer (22), specifically connected by metal lines, and the first electrode layer (21) and the second electrode layer (22) respectively form a tooth comb-shaped interdigitated electrode structure in the form of metal strips, and the interdigitated electrode structure can be set as a horizontal tooth comb structure or a vertical tooth comb structure according to the electrode shape design.

[0017] When the electrode is actually used, the interdigitated electrodes of the front electrode contact the detection liquid, generating an electrical signal which is transmitted outward through the electrode pins. The electrical signals transmitted by different pins can be collected to construct multiple electrode systems for detecting specific indicators. The first electrode pin (11) and the second electrode pin (12) constitute an electrode system which can be used to detect capacitance parameters.

[0018] The front electrode layer also includes a third electrode layer, which is connected to the fourth electrode pin (14) correspondingly, and the third electrode layer is arranged near the area where the first electrode layer (21) and the second electrode layer (22) are located. The position of the third electrode layer can be set according to actual needs, such as the attached Figure 1 In the embodiment, the third electrode layer is arranged below the area where the second electrode layer (22) is located, and beside the line connecting the second electrode layer (22) and the second electrode pin (12).

[0019] The back electrode is also provided with four electrode pins at positions corresponding to the front electrode, and shares a conductive through hole with the pins provided on the front electrode, wherein the fifth electrode pin (31) and the first electrode pin (11), the sixth electrode pin (32) and the second electrode pin (12), the seventh electrode pin (33) and the third electrode pin (13), and the eighth electrode pin (34) and the fourth electrode pin (14) are respectively provided at the same positions on the front and back sides, and a conductive through hole is provided at the same position, the interior of the conductive through hole is processed as a conductive through hole, and the electrode pins on the front and back sides are correspondingly connected through the conductive through hole.

[0020] The sixth electrode pin (32) and the seventh electrode pin (33) on the back are respectively connected to the third electrode layer (41) and the fourth electrode layer (42), specifically connected by metal lines, wherein the third electrode layer (41) occupies the main body of the electrode area, and its electrode covering position coincides with the position of the front interdigitated electrode structure, and the fourth electrode layer (42) is a thin metal strip, which is arranged on the side of the third electrode layer (41), and its upper end is connected to the upper end of the third electrode layer (41) by a connecting circuit (43).

[0021] The second electrode pin (12) and the third electrode pin (13) are respectively connected to the sixth electrode pin (32) and the seventh electrode pin (33) through conductive through holes, and are further connected to the back electrode layer formed by the third electrode layer (41) and the fourth electrode layer (42) and the connecting circuit (43), wherein the connecting circuit (43) can be used as a temperature measuring circuit or a temperature sensitive resistor, and the electrode system formed by the second electrode pin (12) and the third electrode pin (13) can be used to detect temperature parameters.

[0022] Furthermore, the resistance value of the resistor paste is 1300±10%Ω.

[0023] Temperature will affect the capacitance test, so it is necessary to integrate a temperature measurement circuit or thermistor for detecting temperature in the electrode. The resistance value of the resistor slurry can be adjusted according to the needs, so as to modify thermistors with different resistance values ​​to meet the needs of electrochemical detection. The oil electrode of this patent reads the change in capacitance value and exports it to the instrument for calculation, and then obtains the detailed parameters of the oil TPM index. Therefore, the electrode is extremely sensitive to capacitance changes. Temperature detection greatly affects this performance, so it is necessary to ensure the accuracy and stability of this function. For high-temperature oil detection, in order to accurately test the tpm value and other parameters of the oil, this patent selects a resistance value of 1300±10%Ω.

[0024] Furthermore, the front electrode layer is modified with a gold layer, and the thickness of the gold layer is greater than 2 μm.

[0025] The front electrode can be modified with a variety of processes, such as screen printing, electroplating, chemical plating and other methods. The front electrode is modified with a pure gold layer, and the thickness is limited to more than 2μm, which can ensure the sensitivity and stability of the pure gold electrode.

[0026] Furthermore, the back electrode layer is modified with a silver layer, and the thickness of the silver layer is 8 to 15 μm.

[0027] The back electrode can also be modified with a variety of processes, such as screen printing, electroplating, chemical plating and other methods. The back electrode is modified with conductive silver paste, and the thickness is limited to 8 to 15 μm, preferably 10 μm.

[0028] Furthermore, the electrode protection layer modified in the back electrode region (4) does not cover the region where the connecting circuit (43) is located.

[0029] The surfaces of the front electrode pin (1) and the back electrode pin (3) are modified with metal paste, the metal paste comprising conductive silver paste and conductive silver palladium paste; the thickness of the metal paste is 8 to 15 μm, preferably 10 μm.

[0030] A pin is fixed at the lower end of the front electrode pin (1), and the pin can be fixed on the surface of the front electrode pin (1) using solder.

[0031] Furthermore, the thickness of the electrode protection layer is 8 to 15 μm, preferably 10 μm.

[0032] Furthermore, the protective layer material includes glass glaze.

[0033] In order to allow the electrode to be used in a high temperature environment without affecting its sensitivity and accuracy, a protective layer needs to be covered on the electrode surface to protect the metal structure modified on the electrode surface. The metal electrode layer structure modified on the electrode surface may be corroded or peeled off or fall off in a high temperature environment. At the same time, the high temperature and high pressure environment will also affect the overall stability and service life of the electrode. Therefore, it is necessary to select a protective layer that does not affect the contact of the detection molecules with the metal electrode and can isolate other substances. This patent selects materials including but not limited to glass enamel layers for electrode surface protection.

[0034] The glass glaze selected in this patent can be a transparent material, and at the same time, it has no granular feeling after sintering at 850°C. Under the premise of limiting the thickness of the glass glaze protective layer, it can be used in high temperature and high pressure environments and protect the metal circuits on the surface of the electrode. Specifically, the electrode can be immersed in edible oil at a temperature of ≤300°C for more than 24 hours, and neither the electrode nor the glass glaze protective layer is damaged.

[0035] Another object of the present invention is to provide a method for preparing an oil electrode that can simultaneously detect temperature and capacitance, specifically: processing four conductive through holes at the lower end of the electrode substrate, screen-printing a gold electrode on the front side of the substrate, then printing a conductive silver paste in the conductive through hole area on the front side of the substrate to obtain four electrode pins and processing the conductive through holes to obtain four conductive through holes, printing a transparent glass glaze on the surface of the gold electrode on the front side of the substrate, and respectively welding pins at the lower ends of the four electrode pins on the front side of the substrate; screen-printing a silver paste electrode on the back side of the substrate, then printing a resistor paste on the back side of the substrate, and printing a conductive silver paste or a conductive silver-palladium paste in the conductive through hole area on the back side of the substrate to obtain four electrode pins, and printing a transparent glass glaze on the surface of the silver electrode on the back side of the substrate.

[0036] Another object of the present invention is to provide an application of an oil electrode that can simultaneously detect temperature and capacitance, which can be specifically used for high-temperature edible oil quality detection. Specifically, it can accurately test multiple parameters such as the tpm value of edible oil, so as to judge the quality of edible oil and the content of harmful substances, that is, to detect multiple indicators such as acid value, peroxide value, oxidative stability, fatty acid composition, etc. in edible oil in real time to evaluate the quality of edible oil.

[0037] The beneficial effects of the present invention are:

[0038] (1) The present invention modifies the electrode structure and electrode pins on both sides of the same substrate, and sets conductive through holes on the electrode pins to connect the circuits on both sides. The electrochemical reaction signals generated by the electrode detection areas on the front and back sides are transmitted to the electrode pins through this path, and then transmitted out to form multiple detection circuits, which greatly reduces the electrode area and achieves the purpose of simultaneously detecting multiple indicators of oil products.

[0039] (2) The present invention modifies the front and back sides of the electrode with an electrode protective layer such as glass glaze, which isolates and protects the electrode metal layer from the detection liquid without affecting the electrochemical reaction between the detection liquid and the electrode detection area, thereby ensuring the sensitivity, accuracy and stability of the electrode, greatly improving the service life of the electrode, and ensuring that the electrode can be reused many times in extreme environments such as high temperature and high pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0041] Figure 1 It is a front view schematic diagram of the oil electrode that can detect temperature and capacitance simultaneously;

[0042] Figure 2 This is a schematic diagram of the back side of the oil electrode that can detect both temperature and capacitance.

[0043] Legend:

[0044] 1. Front electrode pin; 11. First electrode pin; 12. Second electrode pin; 13. Third electrode pin; 14. Fourth electrode pin; 2. Front electrode area; 21. First electrode layer; 22. Second electrode layer; 3. Back electrode pin; 31. Fifth electrode pin; 32. Sixth electrode pin; 33. Seventh electrode pin; 34. Eighth electrode pin; 4. Back electrode area; 41. Third electrode layer; 42. Fourth electrode layer; 43. Connecting circuit. DETAILED DESCRIPTION

[0045] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail in conjunction with the following specific embodiments and with reference to the accompanying drawings.

[0046] Example 1

[0047] As attached Figure 1 As shown, an oil electrode capable of simultaneously detecting temperature and capacitance provided by the present invention includes an alumina ceramic electrode substrate, an electrode size of 37.50x10.16mm, and a thickness of 1.00mm.

[0048] A front electrode area 2 and a front electrode pin 1 are arranged on the front side of the substrate. The front electrode area 2 is provided with a front electrode layer. The front electrode layer includes a first electrode layer 21 and a second electrode layer 22, and is respectively connected to the first electrode pin 11 and the second electrode pin 12; the front electrode pin 1 includes a first electrode pin 11, a second electrode pin 12, a third electrode pin 13 and a fourth electrode pin 14.

[0049] Mutually parallel and equidistant interdigitated strips are laterally arranged between the upper end of the first electrode layer 21 and the upper end of the second electrode layer 22. The interdigitated strips of the first electrode layer 21 are arranged in the gaps between the interdigitated strips of the second electrode layer 22 with the same spacing. There are 36 pairs of interdigitated strips in total, and the width of the interdigitated strips and the spacing between them, i.e., the line width and line spacing, are 130 μm and 130 μm respectively.

[0050] The front electrode layer also includes a third electrode layer, and is correspondingly connected to the fourth electrode pin 14 . The third electrode layer is arranged below the area where the first electrode layer 21 and the second electrode layer 22 are located, and beside the line connecting the second electrode layer 22 and the second electrode pin 12 .

[0051] The metal pattern of the front electrode layer is modified with a gold film by a screen printing process to obtain a front gold electrode, and the thickness of the gold film is 5 μm.

[0052] A back electrode area 4 and a back electrode pin 3 are arranged on the back side of the substrate. The back electrode area 4 is provided with a back electrode layer. The back electrode layer includes a third electrode layer 41 and a fourth electrode layer 42, and are respectively connected to the sixth electrode pin 32 and the seventh electrode pin 33; the back electrode pin 3 includes a fifth electrode pin 31, a sixth electrode pin 32, a seventh electrode pin 33 and an eighth electrode pin 34.

[0053] A metal electrode layer is arranged at the upper end of the third electrode layer (41), and the fourth electrode layer (42) is arranged on the side of the third electrode layer (41); a connecting circuit (43) is arranged between the third electrode layer (41) and the fourth electrode layer (42), and a resistance paste is coated on the surface of the connecting circuit, and the resistance value of the resistance paste is 1300±10%Ω.

[0054] The back electrode layer is modified with silver paste by screen printing process to obtain a back silver electrode with a silver layer thickness of 10 μm.

[0055] The back electrode is also provided with four electrode pins at the corresponding positions of the front electrode, and shares a conductive through hole with the pins provided on the front electrode, wherein the fifth electrode pin 31 and the first electrode pin 11, the sixth electrode pin 32 and the second electrode pin 12, the seventh electrode pin 33 and the third electrode pin 13, the eighth electrode pin 34 and the fourth electrode pin 14 are respectively provided at the same positions on the front and back sides, and a conductive through hole is provided at the same position respectively, and the inside of the conductive through hole is processed as a conductive through hole, and the electrode pins on the front and back sides are correspondingly connected through the conductive through hole, and the four conductive through holes are consistent in shape and size, and the diameter of the conductive hole is 0.80 mm.

[0056] Conductive silver paste and / or conductive silver-palladium paste are printed on the surfaces of the front electrode pin 1 and the back electrode pin 3, and the thickness of the conductive silver paste is 10 μm.

[0057] The front electrode region 2 and the back electrode region 4 are also decorated with an electrode protection layer. The electrode protection layer is 10 μm thick and made of transparent glass glaze. More than one layer of glass glaze protection layer can be decorated according to actual needs.

[0058] The electrode protection layer modified on the back electrode region 4 does not cover the region where the connecting circuit 43 is located.

[0059] Four pin pins are welded and installed at the lower ends of the four electrode pins of the front electrode pin 1 to facilitate the use of the electrode.

[0060] Example 2

[0061] The present invention provides an oil product electrode capable of simultaneously detecting temperature and capacitance, comprising an alumina ceramic electrode substrate, the electrode size being 37.50 x 10.16 mm and the thickness being 1.00 mm.

[0062] A front electrode area 2 and a front electrode pin 1 are arranged on the front side of the substrate. The front electrode area 2 is provided with a front electrode layer. The front electrode layer includes a first electrode layer 21 and a second electrode layer 22, and is respectively connected to the first electrode pin 11 and the second electrode pin 12; the front electrode pin 1 includes a first electrode pin 11, a second electrode pin 12, a third electrode pin 13 and a fourth electrode pin 14.

[0063] Mutually parallel and equidistant interdigitated strips are laterally arranged between the upper end of the first electrode layer 21 and the upper end of the second electrode layer 22. The interdigitated strips of the first electrode layer 21 are arranged in the gaps between the interdigitated strips of the second electrode layer 22 with the same spacing. There are 30 pairs of interdigitated strips in total, and the width of the interdigitated strips and the spacing between them, i.e., the line width and line spacing, are 100 μm and 100 μm respectively.

[0064] The front electrode layer also includes a third electrode layer, and is correspondingly connected to the fourth electrode pin 14 . The third electrode layer is arranged below the area where the first electrode layer 21 and the second electrode layer 22 are located, and beside the line connecting the second electrode layer 22 and the second electrode pin 12 .

[0065] The metal pattern of the front electrode layer is modified with a gold film by a screen printing process to obtain a front gold electrode, and the thickness of the gold film is 3 μm.

[0066] A back electrode area 4 and a back electrode pin 3 are arranged on the back side of the substrate. The back electrode area 4 is provided with a back electrode layer. The back electrode layer includes a third electrode layer 41 and a fourth electrode layer 42, and are respectively connected to the sixth electrode pin 32 and the seventh electrode pin 33; the back electrode pin 3 includes a fifth electrode pin 31, a sixth electrode pin 32, a seventh electrode pin 33 and an eighth electrode pin 34.

[0067] A metal electrode layer is arranged at the upper end of the third electrode layer (41), and the fourth electrode layer (42) is arranged on the side of the third electrode layer (41); a connecting circuit (43) is arranged between the third electrode layer (41) and the fourth electrode layer (42), and a resistance paste is coated on the surface of the connecting circuit, and the resistance value of the resistance paste is 1300±10%Ω.

[0068] The back electrode layer is modified with silver paste by screen printing process to obtain a back silver electrode with a silver layer thickness of 10 μm.

[0069] The back electrode is also provided with four electrode pins at the corresponding positions of the front electrode, and shares a conductive through hole with the pins provided on the front electrode, wherein the fifth electrode pin 31 and the first electrode pin 11, the sixth electrode pin 32 and the second electrode pin 12, the seventh electrode pin 33 and the third electrode pin 13, the eighth electrode pin 34 and the fourth electrode pin 14 are respectively provided at the same positions on the front and back sides, and a conductive through hole is provided at the same position respectively, and the inside of the conductive through hole is processed as a conductive through hole, and the electrode pins on the front and back sides are correspondingly connected through the conductive through hole, and the four conductive through holes are consistent in shape and size, and the diameter of the conductive hole is 0.80 mm.

[0070] Conductive silver paste and / or conductive silver-palladium paste are printed on the surfaces of the front electrode pin 1 and the back electrode pin 3, and the thickness of the conductive silver paste is 10 μm.

[0071] The front electrode region 2 and the back electrode region 4 are further decorated with an electrode protection layer. The electrode protection layer has a thickness of 10 μm and is made of transparent glass glaze.

[0072] Four pin pins are welded and installed at the lower ends of the four electrode pins of the front electrode pin 1 to facilitate the use of the electrode.

[0073] Example 3

[0074] The present invention provides an oil product electrode capable of simultaneously detecting temperature and capacitance, comprising a silicon-based electrode substrate, an electrode having a size of 32.00 x 11.76 mm, and a thickness of 1.00 mm.

[0075] A front electrode area 2 and a front electrode pin 1 are arranged on the front side of the substrate. The front electrode area 2 is provided with a front electrode layer. The front electrode layer includes a first electrode layer 21 and a second electrode layer 22, and is respectively connected to the first electrode pin 11 and the second electrode pin 12; the front electrode pin 1 includes a first electrode pin 11, a second electrode pin 12, a third electrode pin 13 and a fourth electrode pin 14.

[0076] Mutually parallel and equidistant interdigitated strips are longitudinally arranged between the upper end of the first electrode layer 21 and the upper end of the second electrode layer 22. The interdigitated strips of the first electrode layer 21 are arranged in the gaps between the interdigitated strips of the second electrode layer 22 with the same spacing. There are 24 pairs of interdigitated strips in total, and the width of the interdigitated strips and the spacing between them, i.e., the line width and line spacing, are 100 μm and 100 μm respectively.

[0077] The front electrode layer also includes a third electrode layer, and is correspondingly connected to the fourth electrode pin 14 . The third electrode layer is arranged below the area where the first electrode layer 21 and the second electrode layer 22 are located, and beside the line connecting the second electrode layer 22 and the second electrode pin 12 .

[0078] The metal pattern of the front electrode layer is modified with a gold film by a screen printing process to obtain a front gold electrode, and the thickness of the gold film is 5 μm.

[0079] A back electrode area 4 and a back electrode pin 3 are arranged on the back side of the substrate. The back electrode area 4 is provided with a back electrode layer. The back electrode layer includes a third electrode layer 41 and a fourth electrode layer 42, and are respectively connected to the sixth electrode pin 32 and the seventh electrode pin 33; the back electrode pin 3 includes a fifth electrode pin 31, a sixth electrode pin 32, a seventh electrode pin 33 and an eighth electrode pin 34.

[0080] A metal electrode layer is arranged at the upper end of the third electrode layer (41), and the fourth electrode layer (42) is arranged on the side of the third electrode layer (41); a connecting circuit (43) is arranged between the third electrode layer (41) and the fourth electrode layer (42), and a resistance paste is coated on the surface of the connecting circuit, and the resistance value of the resistance paste is 1300±10%Ω.

[0081] The back electrode layer is modified with silver paste by screen printing process to obtain a back silver electrode with a silver layer thickness of 10 μm.

[0082] The back electrode is also provided with four electrode pins at the corresponding positions of the front electrode, and shares a conductive through hole with the pins provided on the front electrode, wherein the fifth electrode pin 31 and the first electrode pin 11, the sixth electrode pin 32 and the second electrode pin 12, the seventh electrode pin 33 and the third electrode pin 13, the eighth electrode pin 34 and the fourth electrode pin 14 are respectively provided at the same positions on the front and back sides, and a conductive through hole is provided at the same position respectively, and the inside of the conductive through hole is processed as a conductive through hole, and the electrode pins on the front and back sides are correspondingly connected through the conductive through hole, and the four conductive through holes are consistent in shape and size, and the diameter of the conductive hole is 0.80 mm.

[0083] Conductive silver paste and / or conductive silver-palladium paste are printed on the surfaces of the front electrode pin 1 and the back electrode pin 3, and the thickness of the conductive silver paste is 10 μm.

[0084] The front electrode region 2 and the back electrode region 4 are further decorated with an electrode protection layer. The electrode protection layer has a thickness of 10 μm and is made of transparent glass glaze.

[0085] Four pin pins are welded and installed at the lower ends of the four electrode pins of the front electrode pin 1 to facilitate the use of the electrode.

[0086] Example 4

[0087] The present invention provides an oil product electrode capable of simultaneously detecting temperature and capacitance, comprising a glass electrode substrate, an electrode size of 32.00 x 11.76 mm, and a thickness of 1.00 mm.

[0088] A front electrode area 2 and a front electrode pin 1 are arranged on the front side of the substrate. The front electrode area 2 is provided with a front electrode layer. The front electrode layer includes a first electrode layer 21 and a second electrode layer 22, and is respectively connected to the first electrode pin 11 and the second electrode pin 12; the front electrode pin 1 includes a first electrode pin 11, a second electrode pin 12, a third electrode pin 13 and a fourth electrode pin 14.

[0089] Mutually parallel and equidistant interdigitated strips are longitudinally arranged between the upper end of the first electrode layer 21 and the upper end of the second electrode layer 22. The interdigitated strips of the first electrode layer 21 are arranged in the gaps between the interdigitated strips of the second electrode layer 22 with the same spacing. There are 30 pairs of interdigitated strips in total, and the width of the interdigitated strips and the spacing between them, i.e., the line width and line spacing are 50 μm and 50 μm respectively.

[0090] The front electrode layer also includes a third electrode layer, and is correspondingly connected to the fourth electrode pin 14 . The third electrode layer is arranged below the area where the first electrode layer 21 and the second electrode layer 22 are located, and beside the line connecting the second electrode layer 22 and the second electrode pin 12 .

[0091] The metal pattern of the front electrode layer is modified with a gold film by a screen printing process to obtain a front gold electrode, and the thickness of the gold film is 5 μm.

[0092] A back electrode area 4 and a back electrode pin 3 are arranged on the back side of the substrate. The back electrode area 4 is provided with a back electrode layer. The back electrode layer includes a third electrode layer 41 and a fourth electrode layer 42, and are respectively connected to the sixth electrode pin 32 and the seventh electrode pin 33; the back electrode pin 3 includes a fifth electrode pin 31, a sixth electrode pin 32, a seventh electrode pin 33 and an eighth electrode pin 34.

[0093] A metal electrode layer is arranged at the upper end of the third electrode layer (41), and the fourth electrode layer (42) is arranged on the side of the third electrode layer (41); a connecting circuit (43) is arranged between the third electrode layer (41) and the fourth electrode layer (42), and a resistance paste is coated on the surface of the connecting circuit, and the resistance value of the resistance paste is 1300±10%Ω.

[0094] The back electrode layer is modified with silver paste by screen printing process to obtain a back silver electrode with a silver layer thickness of 10 μm.

[0095] The back electrode is also provided with four electrode pins at the corresponding positions of the front electrode, and shares a conductive through hole with the pins provided on the front electrode, wherein the fifth electrode pin 31 and the first electrode pin 11, the sixth electrode pin 32 and the second electrode pin 12, the seventh electrode pin 33 and the third electrode pin 13, the eighth electrode pin 34 and the fourth electrode pin 14 are respectively provided at the same positions on the front and back sides, and a conductive through hole is provided at the same position respectively, and the inside of the conductive through hole is processed as a conductive through hole, and the electrode pins on the front and back sides are correspondingly connected through the conductive through hole, and the four conductive through holes are consistent in shape and size, and the diameter of the conductive hole is 0.80 mm.

[0096] Conductive silver paste and / or conductive silver-palladium paste are printed on the surfaces of the front electrode pin 1 and the back electrode pin 3, and the thickness of the conductive silver paste is 10 μm.

[0097] The front electrode region 2 and the back electrode region 4 are further decorated with an electrode protection layer. The electrode protection layer has a thickness of 10 μm and is made of transparent glass glaze.

[0098] Four pin pins are welded and installed at the lower ends of the four electrode pins of the front electrode pin 1 to facilitate the use of the electrode.

[0099] Example 5

[0100] Take the oil electrodes that can simultaneously detect temperature and capacitance provided in Examples 1 to 4, and set them to be numbered as electrode 1 to electrode 4 respectively. Under the same test conditions, the capacitance values ​​of edible oil samples with different temperatures and different TPM values ​​are tested, and compared with the detection results of existing electrodes purchased on the market.

[0101] Table 1. Capacitance data of electrode 1 for detecting edible oil (pF)

[0102]

[0103] Table 2. Capacitance data of electrode 2 for detecting edible oil (pF)

[0104]

[0105] Table 3. Capacitance data of electrode 3 for detecting edible oil (pF)

[0106]

[0107] Table 4. Capacitance data of electrode 4 for detecting edible oil (pF)

[0108]

[0109] Embodiments 1 to 4 provide electrodes with higher sensitivity to capacitance changes under the same conditions, making parameter detection results more accurate, and can be used for high-temperature oil detection and precise oil quality detection.

[0110] Example 6

[0111] Take the oil electrodes provided in Example 1 and Example 3, place them in the high-temperature oil sample to be tested, monitor and read the capacitance for a long time, and compare the test results with those of existing electrodes (Testo) purchased on the market under the same test conditions.

[0112] Table 5. Capacitance data fluctuation (pF) of electrodes 1 and 3 continuously monitoring edible oil (150°C)

[0113]

[0114]

[0115] Table 6. Capacitance data fluctuation (pF) of electrodes 1 and 3 continuously monitoring edible oil (190°C)

[0116] Test duration / min Electrode 1 Electrode 3 Comparison electrode 1.00 47.74 44.16 6.48 3.00 47.71 44.19 6.45 6.00 47.73 44.24 6.32 9.00 47.72 44.20 6.45 12.00 47.73 44.13 6.50 15.00 47.72 44.17 6.50 18.00 47.68 44.23 6.53 21.00 47.68 44.32 6.54 Maximum 47.74 44.32 6.54 Minimum 47.68 44.13 6.32 Fluctuation value 0.06 0.19 0.22

[0117] The oil electrodes provided in Examples 1 and 3 have capacitance data fluctuation values ​​significantly smaller than that of the comparison electrodes during long-term continuous monitoring, are more stable in actual use scenarios, and are suitable for continuous monitoring.

[0118] Take the oil electrodes provided in Example 3 and Example 4, place them in a high-temperature oil sample to be tested to read the capacitance, then cool the electrode surface temperature to room temperature and place them in a high-temperature oil sample to be tested again to read the capacitance. Test five times in a row and compare the test results with those of existing electrodes (Testo) purchased on the market under the same test conditions.

[0119] Table 7. Stability test of electrode 3 for repeated detection of edible oil (150°C) (pF)

[0120]

[0121]

[0122] Table 8. Stability test of repeated detection of edible oil products (250°C) by electrode 4 (pF)

[0123] Number of detections Electrode 4 Comparison electrode 1 44.60 6.33 2 44.37 6.70 3 44.47 6.83 4 44.42 6.63 5 44.10 6.83 Maximum 44.60 6.83 Minimum 44.10 6.33 Fluctuation value 0.50 0.50

[0124] The capacitance data of the oil electrodes provided in Examples 3 and 4 did not fluctuate significantly during repeated testing and use, and the fluctuation value was significantly smaller than that of the comparison electrode. The electrodes had good stability and were suitable for repeated testing and reuse.

[0125] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0126] In addition, it should be understood that although this specification is described in accordance with the implementation methods, not every implementation method contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should take the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art. The technical details not described in detail in the present invention can be implemented by any prior art in the art. In particular, all technical features not described in detail in the present invention can be implemented by any prior art.

Claims

1. An oil product electrode capable of simultaneously detecting temperature and capacitance, comprising an electrode substrate, characterized in that: The substrate is provided with a conductive through hole, and the front side of the substrate is provided with a front electrode region (2) and a front electrode pin (1); the back side of the substrate is provided with a back electrode region (4) and a back electrode pin (3); the upper end of the front electrode pin (1) and the upper end of the back electrode pin (3) are provided with the conductive through hole at the same position; the front electrode region (2) and the back electrode region (4) are also decorated with an electrode protective layer.

2. The oil electrode capable of simultaneously detecting temperature and capacitance according to claim 1, characterized in that: The front electrode pin (1) comprises a first electrode pin (11), a second electrode pin (12), a third electrode pin (13) and a fourth electrode pin (14); the back electrode pin (3) comprises a fifth electrode pin (31), a sixth electrode pin (32), a seventh electrode pin (33) and an eighth electrode pin (34).

3. The oil electrode capable of simultaneously detecting temperature and capacitance according to claim 2, characterized in that: The front electrode region (2) is provided with a front electrode layer, the front electrode layer comprises a first electrode layer (21) and a second electrode layer (22), and is respectively connected to the first electrode pin (11) and the second electrode pin (12); the back electrode region (4) is provided with a back electrode layer, the back electrode layer comprises a third electrode layer (41) and a fourth electrode layer (42), and is respectively connected to the sixth electrode pin (32) and the seventh electrode pin (33).

4. The oil electrode capable of simultaneously detecting temperature and capacitance according to claim 3, characterized in that: The upper end of the first electrode layer (21) and the upper end of the second electrode layer (22) are provided with interdigitated strips that are parallel and equidistant from each other, and the interdigitated strips of the first electrode layer (21) are arranged in the gaps between the interdigitated strips of the second electrode layer (22) and have the same spacing distance.

5. The oil electrode capable of simultaneously detecting temperature and capacitance according to claim 3, characterized in that: A metal electrode layer is arranged at the upper end of the third electrode layer (41), and the fourth electrode layer (42) is arranged on the side of the third electrode layer (41); the upper end of the third electrode layer (41) and the upper end of the fourth electrode layer (42) are connected via a connecting circuit (43), and the surface of the connecting circuit (43) is coated with a resistor paste.

6. The oil electrode capable of simultaneously detecting temperature and capacitance according to claim 3, characterized in that: The front electrode layer is modified with a gold layer, and the thickness of the gold layer is greater than 2 μm; the back electrode layer is modified with a silver layer, and the thickness of the silver layer is 8 to 15 μm.

7. The oil electrode capable of simultaneously detecting temperature and capacitance according to claim 3, characterized in that: The front electrode layer also includes a third electrode layer, which is correspondingly connected to the fourth electrode pin (14), and the third electrode layer is arranged near the area where the first electrode layer (21) and the second electrode layer (22) are located.

8. The oil electrode capable of simultaneously detecting temperature and capacitance according to claim 5, characterized in that: The resistance value of the resistor paste is 1300±10%Ω.

9. The oil electrode capable of simultaneously detecting temperature and capacitance according to claim 5, characterized in that: The electrode protection layer modified in the back electrode region (4) does not cover the region where the connecting circuit (43) is located.

10. The oil electrode capable of simultaneously detecting temperature and capacitance according to claim 1, characterized in that: The surfaces of the front electrode pin (1) and the back electrode pin (3) are modified with metal paste, the metal paste comprising conductive silver paste and conductive silver-palladium paste; the thickness of the metal paste is 8 to 15 μm.

11. The oil electrode capable of simultaneously detecting temperature and capacitance according to claim 1, characterized in that: A plug pin is fixed to the lower end of the front electrode pin (1), and the plug pin can be fixed to the surface of the front electrode pin (1) using solder.

12. The oil electrode capable of simultaneously detecting temperature and capacitance according to claim 1, characterized in that: The electrode protection layer has a thickness of 8 to 15 μm.

13. The oil electrode capable of simultaneously detecting temperature and capacitance according to claim 1, characterized in that: The protective layer material includes glass glaze.

14. A method for preparing an oil product electrode capable of simultaneously detecting temperature and capacitance according to claims 1-13, characterized in that: Four conductive through holes are processed at the lower end of the electrode substrate, a gold electrode is screen-printed on the front side of the substrate, and then a conductive silver paste is printed on the conductive through hole area on the front side of the substrate to obtain four electrode pins and the conductive through holes are processed to obtain four conductive through holes, transparent glass glaze is printed on the surface of the gold electrode on the front side of the substrate, and pin pins are respectively welded at the lower ends of the four electrode pins on the front side of the substrate; a silver paste electrode is screen-printed on the back side of the substrate, and then a resistor paste is printed on the back side of the substrate, and a conductive silver paste or a conductive silver-palladium paste is printed in the conductive through hole area on the back side of the substrate to obtain four electrode pins, and transparent glass glaze is printed on the surface of the silver electrode on the back side of the substrate.

15. An application of the oil product electrode capable of simultaneously detecting temperature and capacitance according to claim 14, characterized in that: The oil product electrode can be used for high-temperature edible oil quality detection.

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