Nanometer semiconductor sensor for detecting formaldehyde content of blood bean curd

Abstract

The utility model belongs to the technical field of food safety detection, and relates to a nanometer semiconductor sensor for detecting the formaldehyde content of blood tofu. Comprising a touch screen, an upper shell, a core sensor module, a lower shell and a buckle, the lower shell comprises a circuit board, a white light lamp, an ultraviolet lamp and a buckle; the circuit board comprises an AD7705, a Bluetooth module, a WIFI (Wireless Fidelity) module and a main control chip; the core sensor module comprises a core sensor module shell, a transparent acrylic baffle A right facing the purple light lamp, a transparent acrylic baffle B right facing the white light lamp, an interdigital electrode, a 1mm copper rod, an elastic airtight gasket, an airtight baffle and a sample box. According to the utility model, the STM32F103C8T6 single chip microcomputer and the high-precision AD7705 ADC are adopted, so that the formaldehyde detection equipment with high cost performance is realized. The sensor circuit module has AD acquisition, screen display and data uploading functions, is small and convenient, easy to install and high in timeliness, can quickly detect the formaldehyde content in the blood bean curd, reduces the threshold of blood product detection, and shows a good application prospect.

Description

Technical Field

[0001] This utility model belongs to the field of food safety testing technology and relates to a nano-semiconductor sensor for detecting formaldehyde content in blood tofu. Background Technology

[0002] Blood tofu, a traditional food made from animal blood (such as pig's blood or duck's blood), is rich in high-quality protein, heme iron, and various vitamins, making it a nutritious and excellent blood-nourishing food. However, due to its perishable nature, unscrupulous merchants often illegally add formaldehyde (formalin) as a preservative, seriously endangering consumers' health. Formaldehyde is a potent carcinogen that can cause damage to the nervous system, organ failure, and even death; therefore, the detection of formaldehyde in blood products is particularly important.

[0003] Most existing formaldehyde detection technologies on the market suffer from drawbacks such as expensive equipment, complex operation, and poor portability, making it difficult to meet the needs of rapid on-site food safety testing. Therefore, developing a formaldehyde content detection sensor for blood tofu is of significant practical importance. This invention utilizes advanced semiconductor nanomaterials to create the sensitive element, maintaining a certain level of detection accuracy while also offering the convenience of on-site testing. It enables rapid and accurate detection of formaldehyde content in blood tofu. Its compact and portable design makes it particularly suitable for on-site use by market supervision departments and consumers, providing a reliable technical means to ensure food safety. The widespread application of this sensor will effectively curb the illegal addition of formaldehyde by unscrupulous merchants and genuinely protect consumers' health rights. Utility Model Content

[0004] Based on the above, the purpose of this utility model is to provide a low-cost, compact, convenient, timely, and easy-to-install formaldehyde content detection sensor for blood tofu that can be applied to food safety.

[0005] The technical solution of this utility model is:

[0006] A nano-semiconductor sensor for detecting formaldehyde content in blood tofu is disclosed. The sensor comprises a touchscreen, an upper housing, a core sensor module, a lower housing, and clips. The touchscreen is mounted on the lower housing and exposed through a rectangular groove in the upper housing. It is connected to two screen positioning brackets on the lower housing via two positioning holes on the touchscreen using two M3 bolts. The lower housing includes a circuit board, a white light, a UV light, and clips. The white light, UV light, and lower housing are connected by four M2 bolts and four M2 nuts. The clips are fixed by two M2 bolts and nuts passing through two clip positioning holes in the lower housing. The circuit board is fixed by the two brackets on the lower housing. The circuit board includes an AD7705 chip, a Bluetooth module, a WIFI module, a main control chip, capacitors, and resistors. The upper housing is fixed to four corresponding internally threaded brackets on the lower housing using four M3 bolts.

[0007] The core sensor module includes a core sensor module shell, a transparent acrylic baffle A facing the UV lamp, a transparent acrylic baffle B facing the white light lamp, interdigitated electrodes, a 1mm copper rod, an elastic airtight gasket, an airtight baffle, and a sample box. The interdigitated electrodes and the 1mm copper rod are welded together and pass through a small hole in the core sensor module shell to connect to the outside. The transparent acrylic baffles A and B facing the UV lamp and the white light lamp are sealed to the core sensor module shell with epoxy resin. The 1mm copper rod is welded together and passes through the core sensor module shell with epoxy resin. The elastic airtight gasket is fixed to the core sensor module shell with epoxy resin. The upper part of the sample box has a square groove for holding block-shaped blood tofu. The sample box is placed in the cavity of the core sensor module. The airtight baffle has a protruding structure that allows part of the baffle to pass through the corresponding through hole on the core sensor module shell and be fixed, and then fixed and sealed with the elastic airtight gasket and buckle. The core sensor module is connected to the lower shell using two M2 bolts B through the positioning groove.

[0008] The core sensor module is positioned opposite a transparent acrylic baffle A to the ultraviolet lamp and opposite a transparent acrylic baffle B to the white light lamp. The white light lamp is positioned opposite the sample holding area of ​​the core sensor module, and the ultraviolet lamp is positioned opposite the interdigitated electrode part of the core sensor module. The airtight baffle of the core sensor module passes through the outer shell of the core sensor module and is fixed and sealed by elastic airtight gaskets and buckles.

[0009] The core sensor module is fixed by the positioning groove of the lower housing and two M2 bolts B, which facilitates the disassembly and replacement of the core sensor module. The electrical signal of the interdigitated electrode of the core sensor module is transmitted through a 1mm copper rod.

[0010] The circuit board is fixed by two brackets on the lower housing. The power supply is supplied through the circular opening on the lower housing. The white light and the ultraviolet light are fixed by four M2 bolts and four nuts through four holes on the lower housing. There is a recessed part on the right side of the lower housing, into which the buckle is embedded.

[0011] Preferably, the main control chip is a low-cost, high-performance 32-bit microcontroller, namely STM32F103C8T6.

[0012] Preferably, the AD acquisition chip is a high-precision, low-power Σ-Δ ADC converter AD7705.

[0013] Preferably, the touchscreen control device detects and displays the results.

[0014] Preferably, the 1mm copper rod is made of pure copper to ensure accurate signal transmission.

[0015] In summary, the beneficial effects of this utility model are:

[0016] 1. The entire sensor structure is compact, small and portable, enabling rapid and accurate detection of formaldehyde content in blood tofu;

[0017] 2. Users can manually touch the screen to start the test, view the test results, and save the results;

[0018] 3. The detection, display, and saving of test results can be achieved using a mobile phone via Bluetooth wireless control, avoiding contact with harmful gases;

[0019] 4. The device's online web control can be used to detect, display, and save test results, avoiding contact with harmful gases;

[0020] 5. This sensor features a quick-change core sensor module for detecting other gases. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the overall device of this utility model.

[0022] Figure 2 This is a three-dimensional structural diagram of the core sensor module of this utility model.

[0023] Figure 3 This is an internal cross-sectional view of the core sensor module of this utility model.

[0024] Figure 4 This is a three-dimensional schematic diagram of the assembly of the various parts of the lower outer shell of this utility model.

[0025] Figure 5 This is a three-dimensional schematic diagram of the sample box of this utility model.

[0026] Figure 6 This is a three-dimensional exploded view of the overall device of this utility model.

[0027] In the diagram: 1. Touchscreen; 2. Core sensor module; 3. M3 bolt; 4. Lower housing; 5. Upper housing; 6. Clip; 7. Transparent acrylic baffle A facing the UV lamp; 8. Through-hole structure on the core sensor module housing; 9. Protrusion structure on the airtight baffle; 10. Transparent acrylic baffle B facing the white light lamp; 11. Elastic airtight gasket; 12. Core sensor module housing; 13. Airtight baffle; 14. Interdigitated electrode; 15. 1mm copper rod; 16. Sample box; 17. Bracket A connecting to the upper housing; 18. Circuit board. 19. Positioning bracket B; 20. Circuit board; 21. Fixing nut; 22. Fixing bolt A; 23. White light; 24. Ultraviolet light; 25. Touch screen mounting bracket; 26. AD7705 acquisition chip; 27. Main control chip; 28. Bluetooth module; 29. ​​WIFI module; 30. Recessed part of the lower shell; 31. Bolt B for fixing the core sensor; 32. Sample box groove; 33. Power hole; 34. Touch screen positioning hole; 35. Upper shell groove; 36. Core sensor positioning groove on the lower shell; 37. Snap-on positioning hole. Detailed Implementation

[0028] Now combined with the appendix Figure 1 —6. The embodiments of the present invention are described in detail, and the present invention is further described in detail.

[0029] A nano-semiconductor sensor for detecting formaldehyde content in blood tofu, comprising: a touchscreen 1, an upper housing 5, a core sensor module 2, a lower housing 4, and a clip 6; the touchscreen 1 is mounted on the lower housing 4 and exposed through a rectangular groove 34 in the upper housing 5, and is connected to two screen positioning brackets 24 on the lower housing 4 via two positioning holes 33 using two M3 bolts; the lower housing 4 includes a circuit board 19, a white light 22, an ultraviolet light 23, and the clip 6; the white light... Lamp 22, UV lamp 23 and lower housing 4 are connected by four M2 bolts A21 and four M2 nuts 20. Buckle 6 is fixed by two M2 bolts and nuts passing through two buckle positioning holes 36 of lower housing 4. Circuit board 19 is fixed by two brackets B18 of lower housing 4. Circuit board 19 includes AD770525, Bluetooth module 27, WIFI module 28, main control chip 26 and various capacitors and resistors. Upper housing 5 is connected and fixed to four corresponding brackets A17 with internal threads on lower housing 4 by four M3 bolts 3.

[0030] The core sensor module 2 includes a core sensor module housing 12, a transparent acrylic baffle A7 facing the ultraviolet light, a transparent acrylic baffle B10 facing the white light, interdigitated electrodes 14, a 1mm copper rod 15, an elastic airtight gasket 11, an airtight baffle 13, and a sample box 16. The interdigitated electrodes 14 and the 1mm copper rod 15 are welded together and pass through a small hole in the core sensor module housing 12 to connect to the outside. The transparent acrylic baffles A7 and B10 facing the ultraviolet light and the white light are sealed to the core sensor module housing 12 with epoxy resin. The 1mm copper rod 15 is welded to... The core sensor module housing 12 is sealed with epoxy resin, and the elastic airtight gasket 11 is fixed to the core sensor module housing 12 with epoxy resin. The upper part of the sample box 16 has a square groove 31 for holding block blood tofu. The sample box 16 is placed in the cavity of the core sensor module 2. The airtight baffle 13 has a protruding structure 9 that allows part of the baffle to pass through the corresponding through hole 8 on the core sensor module housing 12 and be fixed. Then it is fixed and sealed with the elastic airtight gasket 11 and the buckle 6. The core sensor module 2 is connected to the lower housing 4 through the positioning groove 35 using two M2 bolts B30.

[0031] The core sensor module 2 is directly opposite the transparent acrylic baffle A7 of the ultraviolet lamp and the transparent acrylic baffle B10 of the white light lamp. The white light lamp 22 is directly opposite the sample holding area of ​​the core sensor module 2, and the ultraviolet lamp 23 is directly opposite the interdigitated electrode 14 of the core sensor module 2. The airtight baffle 13 of the core sensor module 2 passes through the outer shell 12 of the core sensor module and is fixed and sealed by the elastic airtight gasket 11 and the buckle 6.

[0032] The core sensor module 2 is fixed by the positioning groove 35 of the lower housing 4 and two M2 bolts B30, which facilitates the disassembly and replacement of the core sensor module 2. The changing electrical signal of the interdigitated electrode 14 of the core sensor module 2 is transmitted through a 1mm copper rod 15.

[0033] The circuit board 19 is fixed by two brackets B18 of the lower housing 4. The power supply is supplied through the circular opening 32 of the lower housing. The white light 22 and the ultraviolet light 23 are fixed by four M2 bolts A21 and four nuts 20 through four holes of the lower housing 4. The right side of the lower housing has a recessed part 29 in which the buckle 6 is embedded.

[0034] The steps for using the formaldehyde content detection sensor in blood tofu are as follows:

[0035] a. Cut the blood tofu into rectangular tofu blocks with a length, width, and height of 4cm and 1mm respectively, and use them as the test samples.

[0036] b. Place the sample to be tested flat in the recess 31 of the sample box 16 of the core sensor module 2;

[0037] c. Close the airtight baffle 13 and press down the buckle 6;

[0038] d. Click the start measurement button on touch screen 1, and touch screen 1 sends a detection command to the main control chip 26;

[0039] e. The main control chip 26 controls the white light lamp 22 to be turned on to irradiate the sample, and the main control chip 26 controls the ultraviolet light lamp 23 to be turned on to irradiate the interdigitated electrode 14.

[0040] f, 5 minutes later, the main control chip 26 controls the AD acquisition chip 25 to acquire multiple AD values, and then the main control chip 26 performs algorithms such as data verification and validity judgment and takes the average value;

[0041] g. After the acquired data has been calculated, the main control chip 26 sends the detection result to the touch screen 1 for display;

[0042] h, as needed, the main control chip 26 will control the device or upload and display data through the Bluetooth module 27 and the WIFI module 28.

[0043] In this invention, the sensor operates on the following principle: the sensing circuit module is divided into an AD acquisition section, a screen display section, and a data upload section. The AD acquisition section consists of interdigitated electrodes, a voltage divider bias circuit, and an AD acquisition chip connected sequentially. One end of the interdigitated electrode is connected to the AIN1 (+) terminal of the AD acquisition chip AD7705, and the other end is connected to the AIN1 (+) terminal. The interdigitated electrode is connected in series with the voltage divider bias circuit for voltage division. A layer of ZnO nanoflowers, a three-dimensional nano-semiconductor material sensitive to formaldehyde gas, is coated on the interdigitated electrode. When this nanomaterial comes into contact with formaldehyde gas, its resistance value will decrease significantly. The voltage is divided by the voltage divider bias circuit and then acquired by the AD acquisition chip. The acquired data is then sent to the main control chip, which performs calculations and processing on the data. The touchscreen of the screen display section is a serial port screen connected to serial port 1 of the main control chip. The RX pin of the touchscreen is connected to the TX1 pin of the main control chip, and the TX pin of the touchscreen is connected to the RX1 pin of the main control chip. Instructions and data transmission are conducted through serial communication. The main control chip sends the calculated and processed detection results to the screen for display via the serial port. The Bluetooth and WIFI modules in the data upload section communicate with the main control chip via serial communication. The RX of the Bluetooth module is connected to the TX2 of the main control chip, and the TX of the Bluetooth module is connected to the RX2 of the main control chip. The RX of the WIFI module is connected to the TX3 of the main control chip, and the TX of the WIFI module is connected to the RX3 of the main control chip. When wireless control of the device is required, the device can be controlled for detection by sending commands to the Bluetooth or WIFI module.

[0044] The embodiments described above with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. For those skilled in the art, modifications and parameter substitutions can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is determined by the appended claims and their equivalents.

Claims

1. A nano-semiconductor sensor for detecting formaldehyde content in blood tofu, characterized in that: The system includes a touchscreen (1), an upper housing (5), a core sensor module (2), a lower housing (4), and a clip (6). The touchscreen (1) is mounted on the lower housing (4) and exposed through a rectangular groove (34) in the upper housing (5). It is connected to two screen positioning brackets (24) on the lower housing (4) via two positioning holes (33) on the touchscreen (1) using two M3 bolts. The lower housing (4) includes a circuit board (19), a white light (22), a purple light (23), and a clip (6). The white light (22), the purple light (23), and the lower housing (4) are also included. The upper housing (5) is connected by four M2 bolts A (21) and four M2 nuts (20). The buckle (6) is fixed by two M2 bolts and nuts passing through two buckle positioning holes (36) of the lower housing (4). The circuit board (19) is fixed by two brackets B (18) of the lower housing (4). The circuit board (19) includes an AD7705 (25), a Bluetooth module (27), a WIFI module (28), a main control chip (26), a capacitor, and a resistor. The upper housing (5) is connected and fixed to the lower housing (4) by four M3 bolts (3) and four corresponding brackets A (17) with internal threads.

2. The nano-semiconductor sensor for detecting formaldehyde content in blood tofu according to claim 1, characterized in that: The core sensor module (2) includes a core sensor module housing (12), a transparent acrylic baffle A (7) facing the ultraviolet lamp, a transparent acrylic baffle B (10) facing the white light lamp, interdigitated electrodes (14), a 1mm copper rod (15), an elastic airtight gasket (11), an airtight baffle (13), and a sample box (16). The interdigitated electrodes (14) and the 1mm copper rod (15) are welded together and pass through a small hole in the core sensor module housing (12) to connect to the outside. The transparent acrylic baffle A (7) facing the ultraviolet lamp and the transparent acrylic baffle B (10) facing the white light lamp are sealed to the core sensor module housing (12) with epoxy resin. The 1mm copper rod (15) is welded together. The core sensor module housing (12) is sealed with epoxy resin, and the elastic airtight gasket (11) is fixed to the core sensor module housing (12) with epoxy resin. The upper part of the sample box (16) has a square groove (31) for holding block blood tofu. The sample box (16) is placed in the cavity of the core sensor module (2). The airtight baffle (13) has a protruding structure (9) that allows part of the baffle to pass through the corresponding through hole (8) on the core sensor module housing (12) and be fixed. Then it is fixed and sealed with the elastic airtight gasket (11) and the buckle (6). The core sensor module (2) is connected to the lower housing (4) with two M2 bolts B (30) through the positioning groove (35).

3. The nano-semiconductor sensor for detecting formaldehyde content in blood tofu according to claim 1, characterized in that: The core sensor module (2) is directly opposite the transparent acrylic baffle A (7) of the ultraviolet lamp and the transparent acrylic baffle B (10) of the white lamp. The white lamp (22) is directly opposite the sample holding area of ​​the core sensor module (2), and the ultraviolet lamp (23) is directly opposite the interdigitated electrode (14) part of the core sensor module (2). The airtight baffle (13) of the core sensor module (2) passes through the outer shell (12) of the core sensor module and is fixed and sealed by the elastic airtight gasket (11) and the buckle (6).

4. The nano-semiconductor sensor for detecting formaldehyde content in blood tofu according to claim 1, characterized in that: The core sensor module (2) is fixed by the positioning groove (35) of the lower housing (4) and two M2 bolts B (30), which facilitates the disassembly and replacement of the core sensor module (2). The electrical signal of the interdigitated electrode (14) of the core sensor module (2) is transmitted through a 1mm copper rod (15).

5. The nano-semiconductor sensor for detecting formaldehyde content in blood tofu according to claim 1, characterized in that: The circuit board (19) is fixed by two brackets B (18) of the lower housing (4). The power supply is supplied through the circular opening (32) of the lower housing. The white light (22) and the ultraviolet light (23) are fixed by four M2 bolts A (21) and four nuts (20) through four holes of the lower housing (4). The right side of the lower housing has a recessed part (29) in which the buckle (6) is embedded.

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