Device for measuring resistance of tin oxide slurry

Abstract

The invention provides a device for measuring the resistance of tin oxide slurry, and relates to the technical field of electronic component measurement. An upper computer is connected with a main control chip through a UART (Universal Asynchronous Receiver / Transmitter), the main control chip is respectively connected with a power supply, an analog switch, an AHT10 and an analog-to-digital converter, the analog-to-digital converter is respectively connected with the power supply, a reference resistor, a reference voltage chip and the analog switch, and the analog switch is grounded and connected with the reference resistor. According to the invention, the problems of high cost and large limitation of measuring the electrical performance of the MOS sensor in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic component measurement, in particular to a device for measuring resistance of tin oxide slurry. BACKGROUND

[0002] Gas sensing technology is widely used in many fields. MOS sensors have become a popular choice due to their high sensitivity, fast response, and ease of integration. However, there are significant performance differences between different batches and the same batch in production, which leads to high costs for downstream industries to use MOS sensors for debugging. The electrical properties of MOS sensors are strongly related to the electrical properties of tin oxide slurry. Existing solutions such as a doctor blade fineness meter or a particle size analyzer have limitations such as high cost, only observing non-electrical performance parameters such as viscosity and dispersibility of the slurry, and being unable to directly reflect the electrical properties of the slurry, making it difficult to effectively improve the consistency of the sensor at low cost and complexity. SUMMARY

[0003] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide a device for measuring resistance of tin oxide slurry. The present application solves the problem of high cost and large limitations in measuring the electrical properties of MOS sensors in the prior art.

[0004] To achieve the above-mentioned purpose, the present application provides the following solutions:

[0005] A device for measuring resistance of tin oxide slurry, comprising:

[0006] Host computer, UART, power supply, main control chip, reference voltage chip, digital-to-analog converter, analog switch, AHT10 and reference resistance:

[0007] The host computer is connected to the main control chip through the UART, the main control chip is connected to the power supply, analog switch, AHT10 and the analog-to-digital converter, the digital-to-analog converter is connected to the power supply, reference resistance, reference voltage chip and the analog switch, and the analog switch is grounded and connected to the reference resistance;

[0008] The digital-to-analog converter is used to collect voltage data of the conductive slurry to be measured, the host computer is used to store resistance and environmental temperature and humidity data, the analog switch is used to flip the electric field direction between the two electrodes, the reference voltage chip is used to provide high-precision voltage to the reference resistance and the digital-to-analog converter, and the reference resistance is used to calculate the corresponding reference resistance of the conductive slurry to be measured. The main control chip is used to calculate the resistance of the conductive slurry to be measured according to the corresponding reference resistance and the voltage data

[0009] Preferably, the main control chip connects the analog-to-digital converter through the SPI protocol.

[0010] Preferably, the master chip controls the state switching of the analog switch through the GPIO pin.

[0011] Preferably, the host computer is connected with the master chip through a Type-C interface.

[0012] Preferably, the model of the master chip is STM32F103C8T6.

[0013] Preferably, the model of the digital-to-analog converter is ADS124S08.

[0014] Preferably, the model of the analog switch is SGM3005.

[0015] The present application discloses the following technical effects:

[0016] The present application provides a device for measuring the resistance of tin oxide slurry, comprising: a host computer, a UART, a power supply, a master chip, a reference voltage chip, a digital-to-analog converter, an analog switch, an AHT10 and a reference resistance: the host computer is connected with the master chip through the UART, the master chip is connected with the power supply, the analog switch, the AHT10 and the digital-to-analog converter respectively, the digital-to-analog converter is connected with the power supply, the reference resistance, the reference voltage chip and the analog switch respectively, and the analog switch is grounded and connected with the reference resistance; the digital-to-analog converter is used for collecting the voltage data of the conductive slurry to be measured, the host computer is used for storing the resistance and environmental temperature and humidity data, the AHT10 is used for collecting the environmental temperature and humidity, the analog switch is used for flipping the electric field direction between the electrodes, the reference voltage chip is used for providing high-precision voltage to the reference resistance and the digital-to-analog converter, the reference resistance is used for calculating the corresponding reference resistance of the conductive slurry to be measured, and the master chip is used for calculating the resistance of the conductive slurry to be measured according to the corresponding reference resistance and the voltage data. The present application directly reflects the resistance of the slurry, can improve the consistency of the sensor, and has the advantages of low cost, simple operation, practicality and operability. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0018] Figure 1 The device for measuring the resistance of tin oxide slurry provided by the present application is shown in the structural diagram.

[0019] Figure 2A product test schematic provided for the embodiment of the present application is shown in the following table:

[0020] Figure 3 A first test result schematic provided for the embodiment of the present application is shown in the following table, Figure 3 (a) is a test result schematic of different deionized water contents under 30 minutes of grinding, Figure 3 (b) is a test result schematic of different deionized water contents under 50 minutes of grinding, Figure 3 (c) is a test result schematic of different deionized water contents under 70 minutes of grinding, Figure 3 (d) is a test result schematic of different deionized water contents under 90 minutes of grinding;

[0021] Figure 4 A second test result schematic provided for the embodiment of the present application is shown in the following table. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0023] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0024] As shown in the following table, Figure 1 The present application provides a device for measuring resistance of tin oxide slurry, comprising:

[0025] The host computer, UART, power supply, main control chip, reference voltage chip, digital-to-analog converter, analog switch, AHT10 and reference resistance are connected as follows:

[0026] The host computer is connected with the main control chip through UART, the main control chip is connected with the power supply, analog switch, AHT10 and the digital-to-analog converter respectively, the digital-to-analog converter is connected with the power supply, reference resistance, reference voltage chip and the analog switch respectively, and the analog switch is grounded and connected with the reference resistance;

[0027] The digital-to-analog converter is used to collect the voltage data of the conductive slurry to be tested, the host computer is used to store the resistance and environmental temperature and humidity data, the analog switch is used to flip the electric field direction between the electrodes, and the electric field direction flipping is used to suppress the enrichment of slurry ions around the electrodes and to suppress the electrolytic reaction of the slurry under the fixed electric field, the reference voltage chip is used to provide high-precision voltage for the reference resistor and the digital-to-analog converter, the reference resistor is used to calculate the corresponding reference resistance of the conductive slurry to be tested, and the host chip is used to calculate the resistance of the conductive slurry to be tested according to the corresponding reference resistance and the voltage data according to the formula Rb=RaRcVx / (VccRc-Vx(Ra+Rc)) (where Rb is the resistance value of the slurry, Ra is the reference resistance value, Rc is the input resistance of the ADC, Vcc is the reference voltage value, and Vx is the voltage value measured by the ADC).

[0028] Specifically, it includes an electrode protection layer (conducting carbon glue is applied to the surface of the electrode and dried at 120 DEG C for 30 minutes to form an electrode protection layer), an electrode inter-electric field flip driving circuit (the periodic connection of the electrodes to the ground and the reference resistance is realized by the main control chip controlling the analog switch), host computer software, an analog-to-digital converter (ADC) for collecting voltage values, and a main control chip for calculating the tin oxide slurry resistance. By inserting the electrodes of the instrument into the tin oxide slurry, the resistance of the slurry is measured to obtain the state of the slurry (the degree of dryness of the slurry) to realize the state control of the slurry.

[0029] Further, the main control chip is connected to the analog-to-digital converter through the SPI protocol.

[0030] Further, the main control chip controls the state switching of the analog switch through the GPIO pin.

[0031] Further, the host computer is connected to the main control chip through the Type-C interface.

[0032] Specifically, the product uses Type-C to realize connection with the upper computer and power supply for the instrument through Type-C. The upper computer has a software based on python which can display the collection results of the instrument in real time, including the resistance of tin oxide paste, environmental temperature and humidity, and paste state. In the hardware design of the instrument, the power supply is used to power the master control chip, analog-to-digital converter (ADC), analog switch, reference voltage chip, AHT10 and other elements. The master control chip communicates with the ADC using the SPI protocol. The master control chip controls the state of the analog switch through the GPIO to realize the control of the two ends of the electrode alternately connected to one end of the reference resistance and the ground (GND), thereby realizing the periodic flipping of the electric field at the two ends of the electrode. The two ends of the electrode are connected to two input ends of the ADC. The reference voltage chip provides reference voltage for the ADC and supplies power for the reference resistance. The AHT10 collects environmental temperature and humidity. The product obtains the state stage of the tin oxide paste by collecting the resistance of the tin oxide paste and the environmental temperature and humidity.

[0033] Further, the model of the master control chip is STM32F103C8T6.

[0034] Further, the model of the digital-to-analog converter is ADS124S08.

[0035] Further, the model of the analog switch is SGM3005.

[0036] Specifically, the content displayed by the upper computer software is the resistance of the tin oxide paste collected by the instrument and the environmental temperature and humidity, as well as the paste state of the tin oxide, such as the paste state stage.

[0037] The test steps of the product are as follows:

[0038] Step 1: Connect the instrument with the upper computer using Type-C;

[0039] Step 2: Insert the electrode of the instrument into the paste;

[0040] Step 3: Open the upper computer software to store the collected data.

[0041] As shown in Figure 2 , it is the test diagram of the product, as shown in Figure 3 and 4 , it is the first test result diagram and the second test result diagram of the product. The first test result is to add 550-1050 uL of deionized water (step interval is 100 uL) to the tin oxide paste ground for 30-90 minutes (step interval is 20 minutes), Figure 3 (a) is the test result of different deionized water content under grinding for 30 minutes; Figure 3 (b) is the test result of different deionized water content under grinding for 50 minutes; Figure 3(c) Test results for different deionized water contents for 70 minutes of milling; Figure 3 (d) Test results for different deionized water contents for 90 minutes of milling, and from the test results, the resistance of the slurry first decreases (settling stage, at which the slurry gradually settles, and the resistance decreases as the tin oxide particles gather), then remains substantially stable (stable stage, at which the tin oxide slurry is substantially settled, and the tin oxide particles are substantially coagulated into blocks), then gradually increases (gradual drying stage, at which the tin oxide surface is exposed, i.e., part of the tin oxide powder is no longer wet), and finally, the resistance value substantially exceeds 1 MΩ (drying stage). The second test result graph shows that, during the settling stage to the gradual drying stage, the resistance of the slurry is related to the ambient temperature and humidity, and during the drying stage, the resistance of the slurry is strongly related to the ambient temperature.

[0042] The embodiments in the present specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0043] The principles and implementation manners of the present application are described by using specific examples in the present specification. The above description of the embodiments is only used to help understand the method of the present application and its core idea. Meanwhile, for those skilled in the art, the specific implementation manners and application ranges can be changed according to the idea of the present application. In summary, the content of the present specification should not be understood as a limitation of the present application.

Claims

1. An apparatus for measuring the resistance of a tin oxide paste, characterized by, The application relates to a temperature and humidity acquisition device for measuring the resistance of conductive paste. The host computer is connected with the main control chip through UART, the main control chip is connected with the power supply, the analog switch, the AHT10 and the analog-digital converter respectively, the digital-analog converter is connected with the power supply, the reference resistor, the reference voltage chip and the analog switch respectively, and the analog switch is grounded and connected with the reference resistor. The AHT10 is used for collecting environmental temperature and humidity and transmitting the environmental temperature and humidity to the main control chip, the digital-analog converter is used for collecting voltage data of the conductive paste to be measured, the host computer is used for storing the resistance and environmental temperature and humidity data, the analog switch is used for reversing the electric field direction between the electrodes, the reference voltage chip is used for providing high-precision voltage for the reference resistor and the digital-analog converter, the reference resistor is used for calculating the corresponding reference resistor of the resistance of the conductive paste to be measured, and the main control chip is used for calculating the resistance of the conductive paste to be measured according to the corresponding reference resistor and the voltage data and communicating with the host computer. The main control chip is connected with the analog-digital converter through an SPI protocol.

2. The device for measuring the resistance of tin oxide slurry according to claim 1, wherein The main control chip controls the state switching of the analog switch through a GPIO pin.

3. The device for measuring the resistance of tin oxide slurry according to claim 1, wherein The host computer is connected with the main control chip through a Type-C interface.

4. The device for measuring resistance of tin oxide slurry according to claim 1, wherein The model of the main control chip is STM32F103C8T6.

5. The device for measuring the resistance of tin oxide slurry according to claim 1, wherein The model of the digital-analog converter is ADS124S08.

6. The device for measuring the resistance of tin oxide slurry according to claim 1, wherein The model of the analog switch is SGM3005.

7. The device for measuring the resistance of tin oxide slurry according to claim 1, wherein ​

Images