Nanometer semiconductor sensor for detecting formaldehyde content of blood bean curd

Abstract

The invention belongs to the technical field of food safety detection, and relates to a nanometer semiconductor sensor for detecting the formaldehyde content of blood bean curd. 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 right opposite to the purple light lamp, a transparent acrylic baffle right opposite to 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 formaldehyde detection device, the STM32F103C8T6 single chip microcomputer and the high-precision AD7705 ADC are adopted, and the formaldehyde detection device which is low in cost and high in performance is achieved. 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] The invention belongs to the technical field of food safety detection and relates to a nano semiconductor sensor for detecting formaldehyde content in blood tofu. Background Art

[0002] Blood tofu is a traditional food made from animal blood (such as pig and duck blood). Rich in high-quality protein, heme iron, and various vitamins, it is a nutritious blood tonic. However, due to its perishable nature, unscrupulous vendors often illegally add formaldehyde (formalin) as a preservative, seriously endangering consumer health. Formaldehyde is a potent carcinogen that can cause neurological damage, organ failure, and even be life-threatening. Therefore, the detection of formaldehyde in blood products is particularly important.

[0003] Most of the existing formaldehyde detection technologies on the market currently have disadvantages such as expensive equipment, complicated operation, and poor portability, making it difficult to meet the needs of rapid on-site food safety detection. In response to these problems, the development of a blood tofu formaldehyde content detection sensor has important practical significance. The present invention uses advanced semiconductor nanomaterials to make sensitive elements, which retains a certain degree of detection accuracy while also combining the convenience of on-site detection, and can achieve rapid and accurate detection of formaldehyde content in blood tofu. Its compact and portable features are particularly suitable for on-site use by market supervision departments and consumers, providing a reliable technical means to ensure food safety. The promotion and application of this sensor will effectively curb the illegal addition of formaldehyde by unscrupulous businesses and effectively protect the health rights and interests of consumers. Summary of the Invention

[0004] Based on the above, the purpose of the present invention is to provide a blood tofu formaldehyde content detection sensor that can be used in food safety, which is low-cost, compact, simple, time-effective, and easy to install.

[0005] The technical solution of the present invention is:

[0006] A nanometer semiconductor sensor for detecting formaldehyde content in blood tofu, which is used to detect the formaldehyde content in blood tofu, comprises: a touch screen, an upper shell, a core sensor module, a lower shell, and a buckle; the touch screen is mounted on the lower shell and exposed through a rectangular groove of the upper shell, and is connected to two screen positioning brackets on the lower shell using two M3 bolts through two positioning holes on the touch screen; the lower shell comprises a circuit board, a white light lamp, a purple light lamp, and a buckle; the white light lamp, the purple light lamp, and the lower shell are connected using four M2 bolts and four M2 nuts, the buckle is fixed through two buckle positioning holes in the lower shell by two M2 bolts and nuts, and the circuit board is fixed by two brackets of the lower shell, the circuit board comprising an AD7705, a Bluetooth module, a Wi-Fi module, a main control chip, and various capacitors and resistors; the upper shell is connected and fixed to four corresponding brackets containing internal threads on the lower shell using four M3 bolts;

[0007] The core sensor module includes a core sensor module housing, a transparent acrylic baffle facing the ultraviolet lamp, a transparent acrylic baffle facing the white light lamp, a forked electrode, a 1mm copper rod, an elastic airtight gasket, an airtight baffle and a sample box. The forked electrode and the 1mm copper rod are welded together and connected to the outside through the small hole in the core sensor module housing. The transparent acrylic baffle facing the ultraviolet lamp and the transparent acrylic baffle facing the white light lamp are sealed with the core sensor module housing using epoxy resin. The 1mm copper rod is welded together and passed through the core sensor module housing and sealed with epoxy resin. The elastic airtight gasket is fixed to the core sensor module housing through epoxy resin. There is a square groove on the upper part of the sample box for holding block blood tofu. The sample box is placed in the cavity of the core sensor module. There is a protrusion structure on the airtight baffle that allows a part of the baffle to pass through the corresponding through hole on the core sensor module housing and then be fixed and sealed with the elastic airtight gasket and the buckle. The core sensor module is connected through the positioning groove of the lower housing using two M2 bolts.

[0008] The core sensor module is facing the transparent acrylic baffle of the ultraviolet lamp and the transparent acrylic baffle of the white light lamp. The white light lamp is facing the sample holding part of the core sensor module, and the ultraviolet lamp is facing the interdigitated electrode part of the core sensor module. The airtight baffle of the core sensor module passes through the core sensor module shell and is then fixed and sealed by elastic airtight gaskets and buckles.

[0009] The core sensor module is fixed by the positioning groove of the lower shell and two M2 bolts, which makes it easy to disassemble and replace the core sensor module. The electrical signal of the change of the interdigital electrode of the core sensor module is transmitted through the 1mm copper rod.

[0010] The circuit board is fixed by two brackets of the lower shell, the power supply is supplied through the circular opening of the lower shell, the white light lamp and the purple light lamp are fixed through the four holes of the lower shell using four M2 bolts and four nuts. A recessed part is provided on the right side of the lower shell, and the snap is embedded in it.

[0011] Preferably, the main control chip adopts STM32F103C8T6 low-cost and high-performance 32-bit microcontroller.

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

[0013] Preferably, the touch screen controls the detection of the device and the display of 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 the present invention are:

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

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

[0018] 3. You can use the mobile phone Bluetooth wireless control device to detect, display and save the test results to avoid exposure to harmful gases;

[0019] 4. You can use the device's online webpage to control the device's detection, display the test results, and save the test results to avoid exposure to harmful gases;

[0020] 5. This sensor can be used to detect other gases by quickly replacing the core sensor module. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of the overall device of the present invention.

[0022] Figure 2 It is a schematic diagram of the three-dimensional structure of the core sensor module of the present invention.

[0023] Figure 3 This is an internal cross-sectional view of the core sensor module of the present invention.

[0024] Figure 4 It is a schematic three-dimensional diagram of the assembly of the parts of the lower housing of the present invention.

[0025] Figure 5 It is a three-dimensional schematic diagram of the sample box of the present invention.

[0026] Figure 6 It is a schematic exploded perspective view of the overall device of the present invention.

[0027] Figure: 1. Touch screen; 2. Core sensor module; 3. M3 bolts; 4. Lower housing; 5. Upper housing; 6. Buckle; 7. Transparent acrylic baffle facing the ultraviolet light; 8. Through-hole structure on the core sensor module housing; 9. Protrusion structure on the airtight baffle; 10. Transparent acrylic baffle facing the white light; 11. Elastic airtight gasket; 12. Core sensor module housing; 13. Airtight baffle; 14. Interdigital electrodes; 15. 1mm copper rod; 16. Sample box; 17. Bracket connected to the upper housing; 18. Circuit board Positioning bracket; 19. Circuit board; 20. Fixing nut; 21. Fixing bolt; 22. White light; 23. Purple light; 24. Fixing bracket for touch screen; 25. AD7705 acquisition chip; 26. Main control chip; 27. Bluetooth module; 28. Wi-Fi module; 29. Recessed part of the lower shell; 30. Bolt for fixing the core sensor; 31. Sample box groove; 32. Power supply hole; 33. Touch screen positioning hole; 34. Upper shell groove; 35. Core sensor positioning groove on the lower shell; 36. Snap-on positioning hole. DETAILED DESCRIPTION

[0028] Now combined with the attached Figure 1 ——6 Describe the embodiments of the present invention in detail and further explain the present invention in detail.

[0029] A nanometer semiconductor sensor for detecting formaldehyde content in blood tofu, which is used to detect formaldehyde content in blood tofu, comprises: a touch screen 1, an upper shell 5, a core sensor module 2, a lower shell 4 and a buckle 6; the touch screen 1 is mounted on the lower shell 4 and exposed through a rectangular groove 34 of the upper shell 5, and is connected to two screen positioning brackets 24 on the lower shell 4 using two M3 bolts through two positioning holes 33 on the touch screen 1; the lower shell 4 comprises a circuit board 19, a white light lamp 22, a purple light lamp 23 and a buckle 6; the white light lamp 22 is connected to the lower shell 4 by ... core sensor module 2, a lower shell 4 and a buckle 6; the white light lamp 22 is connected to the lower shell 4 by a circuit board 19, a core sensor module 2, a lower shell 4 and a buckle 6; the white light lamp 22 is connected to the lower shell 4 by a circuit board 19, a core sensor module 2 The light lamp 22, the purple light lamp 23 and the lower shell 4 are connected by four M2 bolts 21 and four M2 nuts 20. The buckle 6 is fixed by two M2 bolts and nuts through the two buckle positioning holes 36 of the lower shell 4. The circuit board 19 is fixed by the two brackets 18 of the lower shell 4. The circuit board 19 contains AD770525, Bluetooth module 27, WIFI module 28, main control chip 26 and various capacitors and resistors; the upper shell 5 is connected and fixed with four corresponding brackets 17 with internal threads on the lower shell 4 using four M3 bolts 3.

[0030] The core sensor module 2 includes a core sensor module housing 12, a transparent acrylic baffle 7 facing the violet lamp, a transparent acrylic baffle 10 facing the white light lamp, a cross-finger electrode 14, a 1mm copper rod 15, an elastic airtight gasket 11, an airtight baffle 13 and a sample box 16. The cross-finger electrode 14 and the 1mm copper rod 15 are welded together and passed through the small hole of the core sensor module housing 12 to be connected to the outside. The transparent acrylic baffle 7 facing the violet lamp and the transparent acrylic baffle 10 facing the white light lamp are sealed with the core sensor module housing 12 using epoxy resin. The 1mm copper rod 15 is welded together and passed through the small hole of the core sensor module housing 12 to be connected to the outside. 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 through epoxy resin. There is a square groove 31 on the upper part of the sample box 16 for holding block blood tofu. The sample box 16 is placed in the chamber of the core sensor module 2. There is a protrusion structure 9 on the airtight baffle 13, which allows a part of the baffle to pass through the corresponding through hole 8 on the core sensor module housing 12 and then be fixed, and then fixed and sealed with the elastic airtight gasket 11 and the buckle 6. The core sensor module 2 is connected through the positioning groove 35 of the lower housing 4 using two M2 bolts 30.

[0031] The core sensor module 2 is facing the transparent acrylic baffle 7 of the ultraviolet lamp and the transparent acrylic baffle 10 of the white light lamp. The white light lamp 22 is facing the sample holding part of the core sensor module 2. The ultraviolet lamp 23 is facing the interdigital electrode 14 of the core sensor module 2. The airtight baffle 13 of the core sensor module 2 passes through the core sensor module housing 12 and is then 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 shell 4 and two M2 bolts 30, which makes it easy to disassemble and replace the core sensor module 2. The changing electrical signals of the interdigital electrodes 14 of the core sensor module 2 are transmitted through the 1mm copper rod 15.

[0033] The circuit board 19 is fixed by two brackets 18 of the lower shell 4, and the power supply is supplied through the circular opening 32 of the lower shell. The white light lamp 22 and the purple light lamp 23 are fixed through the four holes of the lower shell 4 using four M2 bolts 21 and four nuts 20. A recessed part 29 is provided on the right side of the lower shell, and the buckle 6 is embedded in it.

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

[0035] a. Cut the blood tofu into rectangular blocks of 4 cm in length, 1 mm in height as the test sample;

[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 the touch screen 1, and the touch screen 1 sends a detection instruction to the main control chip 26;

[0039] e. The main control chip 26 controls the white light lamp 22 to illuminate the sample, and the main control chip 26 controls the purple light lamp 23 to illuminate the interdigital electrode 14;

[0040] f. After 5 minutes, the main control chip 26 controls the AD acquisition chip 25 to collect multiple AD values. The main control chip 26 then performs algorithms such as verification and validity judgment on the data 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. The main control chip 26 controls the device or uploads and displays data through the Bluetooth module 27 and the WIFI module 28 as needed.

[0043] The sensor principle of the present invention is as follows: the sensor circuit module is divided into an AD acquisition section, a screen display section, and a data upload section. The AD acquisition section is composed of interdigital electrodes, a voltage divider bias circuit, and an AD acquisition chip connected in sequence. One end of the interdigital electrodes is connected to the AIN1 (+) terminal of the AD acquisition chip AD7705, and the other end is connected to the AIN1 (+) terminal. The interdigital electrodes and the voltage divider bias circuit are connected in series to divide the voltage. The interdigital electrodes are coated with a layer of ZnO nanoflowers, a three-dimensional nano-semiconductor material sensitive to formaldehyde gas. When this nanomaterial comes into contact with formaldehyde gas, its resistance decreases significantly. The voltage is divided by the voltage divider bias circuit, and then the AD acquisition chip collects the collected data and sends it to the main control chip, which calculates and processes the data. The touch screen of the screen display section is connected to serial port 1 of the main control chip via a serial port. The touch screen's RX terminal is connected to the main control chip's TX1 terminal, and the touch screen's TX terminal is connected to the main control chip's RX1 terminal. Instructions and data are transmitted via serial communication. The main chip sends the calculated and processed detection results via the serial port to the screen for display. The communication between the Bluetooth module, WIFI module and the main control chip in the data upload part is serial port communication. The RX of the Bluetooth module is connected to the TX2 of the main control chip, 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 instructions to the Bluetooth module 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 interpreted as limiting the present invention. Those skilled in the art will be able to make modifications and parameter substitutions to the 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 nanometer semiconductor sensor for detecting formaldehyde content in blood tofu, which is used to detect formaldehyde content in blood tofu, comprising: A touch screen (1), an upper shell (5), a core sensor module (2), a lower shell (4) and a buckle (6); the touch screen (1) is mounted on the lower shell (4) and exposed through a rectangular groove (34) of the upper shell (5), and is connected to two screen positioning brackets (24) on the lower shell (4) using two M3 bolts through two positioning holes (33) on the touch screen (1); the lower shell (4) includes a circuit board (19), a white light lamp (22), a purple light lamp (23) and a buckle (6); the white light lamp (22), the purple light lamp (23) and the lower shell (4) are connected through four M2 bolts (21) and four M2 nuts (20), and the buckle (6) passes through two buckles of the lower shell (4) through two M2 bolts and nuts The positioning hole (36) is fixed, and the circuit board (19) is fixed by two brackets (18) of the lower shell (4), and the circuit board (19) includes AD7705 (25), a Bluetooth module (27), a WIFI module (28), a main control chip (26) and various capacitors and resistors; the upper shell (5) is connected and fixed with four corresponding brackets (17) containing internal threads on the lower shell (4) using four M3 bolts (3); the core sensor module (2) includes a core sensor module shell (12), a transparent acrylic baffle (7) facing the purple light lamp, a transparent acrylic baffle (10) facing the white light lamp, an interdigitated electrode (14), a 1mm copper rod (15), an elastic airtight gasket (11), an airtight baffle (13) and a sample box (16).

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

3. The nanometer semiconductor sensor for detecting formaldehyde content in blood tofu according to claim 1, characterized in that: The core sensor module (2) is directly opposite to the transparent acrylic baffle (7) of the ultraviolet light and the transparent acrylic baffle (10) of the white light. The white light (22) is directly opposite to the sample holding portion of the core sensor module (2). The ultraviolet light (23) is directly opposite to the interdigital electrode (14) portion of the core sensor module (2). The airtight baffle (13) of the core sensor module (2) passes through the core sensor module housing (12) and is then fixed and sealed by an elastic airtight gasket (11) and a buckle (6).

4. The nanometer semiconductor sensor for detecting formaldehyde content in blood tofu according to claim 1, characterized in that: The core sensor module (2) is fixed by a positioning groove (35) of the lower housing (4) and two M2 bolts (30), making it easy to disassemble and replace the core sensor module (2). The electrical signal of the interdigital electrode (14) of the core sensor module (2) is transmitted through a 1 mm copper rod (15).

5. The nanometer 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 (18) of the lower shell (4), and the power supply is supplied through the circular opening (32) of the lower shell. The white light lamp (22) and the purple light lamp (23) are fixed through four holes of the lower shell (4) using four M2 bolts (21) and four nuts (20). A recessed portion (29) is provided on the right side of the lower shell, and a buckle (6) is embedded therein.

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