A pH sensing circuit

Abstract

The present invention discloses a pH sensing circuit, which includes a passive pH sensor module and a reader module. The passive pH sensor module is wirelessly powered by the reader module, and the passive pH sensor module transmits data wirelessly to the reader module. There are multiple passive pH sensor modules, and the detection ends of the multiple passive pH sensor modules are connected to the object to be measured. The technical solution of the passive pH sensing circuit of the present invention can meet the requirements of the pH monitoring system in different application scenarios, improve the portability, flexibility and intelligent level of the system, and provide a more effective solution for applications in fields such as wound management and environmental monitoring.

Description

Technical Field

[0001] The present invention relates to the technical field of sensors, and particularly to a pH value sensing circuit. Background Art

[0002] Traditional pH value sensor monitoring systems usually require the use of active sensors, which need to be powered by an external power supply, restricting their applications in some specific scenarios, such as remote or mobile environments. In addition, the data transmission of traditional systems usually requires a wired connection or active wireless transmission, increasing the complexity and cost of the system. Moreover, existing passive sensor systems often can only transmit fixed information and cannot perform complex data processing and logical operations, resulting in limited functions of the monitoring system. Summary of the Invention

[0003] The object of the present invention is to provide a pH value sensing circuit.

[0004] To achieve the above object, the present invention is implemented according to the following technical solution:

[0005] The present invention includes a passive pH value sensor module and a reader module. The passive pH value sensor module is wirelessly powered by the reader module, and the passive pH value sensor module transmits data wirelessly to the reader module. There are multiple passive pH value sensor modules, and the detection ends of the multiple passive pH value sensor modules are connected to the object to be measured. The passive pH value sensor module includes a pH sensor, a microcontroller, a memory, an operation module, a frequency modulation module, and a wireless energy harvesting coil. The signal output end of the pH sensor is connected to the signal input end of the microcontroller. The detection end of the pH sensor is connected to the object to be measured. The control signal output end of the microcontroller is connected to the frequency modulation module. The control signal output end of the frequency modulation module is connected to the wireless energy harvesting coil. The signal output end of the wireless energy harvesting coil is connected to the signal input end of the microcontroller. The wireless energy harvesting coil is wirelessly connected to the reader module. The data transmission end of the microcontroller is connected to the memory. The control signal output end of the microcontroller is connected to the frequency modulation module through the operation module.

[0006] Further, the reader module includes a radio frequency energy transmitter, a radio frequency receiver, a data processing module, and a human-computer interaction system. The control signal output end of the human-computer interaction system is connected to the radio frequency energy transmitter. The radio frequency energy transmitter is wirelessly connected to the wireless energy harvesting coil. The data output of the wireless energy harvesting coil is wirelessly connected to the radio frequency receiver. The signal output end of the radio frequency receiver is connected to the human-computer interaction system through the data processing module.

[0007] Specifically, the pH sensor converts the analog voltage of the signal output into a digital signal through an analog-to-digital converter and transmits it to the microcontroller. Let the voltage signal output by the pH sensor be Vsensor, and the converted digital signal be Dsensor. Let the threshold range be pH min -pH max . Use logical operations to determine whether the pH value is within the set range:

[0008] If pHmin ≤ pHmeasured ≤ pH max , then output "pH value is normal";

[0009] Otherwise, output "pH value is abnormal";

[0010] Calibrate the sensor output to make the measurement results more accurate in different environments;

[0011] Let CalibrationFactor be the calibration coefficient;

[0012] Calibrate the digital signal output by the sensor:

[0013] D calibrated = D sensor ×CalibrationFactor

[0014] The calibrated pH value data is stored in a non-volatile memory. Let pH calibrated be the calibrated pH value, and the storage method is: EEPROM_write(pH calibrated ).

[0015] Specifically, the data processing module processes the data through a decoding algorithm and transmits it to the human-computer interaction system. The data decoding algorithm is as follows: Let the data signal sent by the sensor module use frequency modulation, and its frequency f modulated is linearly related to the pH value; the decoding algorithm is set as follows:

[0016] pH decoded = m × f modulated + c

[0017] where m is the slope used to convert the frequency to the pH value, and c is the intercept used to calibrate the decoded pH value; f modulated is the frequency of the received modulated signal, and pH decoded is the decoded pH value.

[0018] The beneficial effects of the present invention are:

[0019] The present invention is a pH value sensing circuit. Compared with the prior art, the present invention has the following technical effects:

[0020] No external power supply: It adopts a passive pH sensor module, which is wirelessly powered by the reader module, enabling the sensor module to operate without an external power supply, greatly increasing its application scope and flexibility.

[0021] Wireless data transmission: The pH value data is transmitted to the reader module through wireless transmission technology, eliminating the need for complex wired connections and simplifying the deployment and maintenance of the system.

[0022] Multi-sensor monitoring: The system supports multiple passive pH sensor modules, which can simultaneously monitor the pH values at multiple locations, improving the monitoring coverage and accuracy.

[0023] Data processing and logical operations: The sensor module is built with components such as a microcontroller, memory, and arithmetic module, which can perform data processing, logical operations, and calibration operations, making the monitoring system more intelligent and reliable.

[0024] Through these technical effects, the new passive pH sensing circuit technical solution can meet the requirements of pH value monitoring systems in different application scenarios, improving the portability, flexibility, and intelligence level of the system, and providing a more effective solution for applications in fields such as wound management and environmental monitoring. Brief Description of the Drawings

[0025] Figure 1 It is a block diagram of the circuit structure principle of the present invention. Detailed Embodiments

[0026] The present invention will be further described below in conjunction with the drawings and specific embodiments. The illustrative embodiments and explanations of this invention are used to explain the present invention, but do not limit the present invention.

[0027] As Figure 1 shown: The present invention includes a passive pH sensor module and a reader module. The passive pH sensor module is wirelessly powered by the reader module, and the passive pH sensor module transmits data wirelessly to the reader module. There are multiple passive pH sensor modules, and the detection ends of the multiple passive pH sensor modules are connected to the object to be measured.

[0028] Further, the passive pH sensor module includes a pH sensor, a microcontroller, a memory, an operation module, a frequency modulation module, and a wireless energy harvesting coil. The signal output end of the pH sensor is connected to the signal input end of the microcontroller. The detection end of the pH sensor is connected to the object to be measured. The control signal output end of the microcontroller is connected to the frequency modulation module. The control signal output end of the frequency modulation module is connected to the wireless energy harvesting coil. The signal output end of the wireless energy harvesting coil is connected to the signal input end of the microcontroller. The wireless energy harvesting coil is wirelessly connected to the reader module. The data transmission end of the microcontroller is connected to the memory. The control signal output end of the microcontroller is connected to the frequency modulation module through the operation module.

[0029] Further, the reader module includes a radio frequency energy transmitter, a radio frequency receiver, a data processing module, and a human-computer interaction system. The control signal output end of the human-computer interaction system is connected to the radio frequency energy transmitter. The radio frequency energy transmitter is wirelessly connected to the wireless energy harvesting coil. The data output of the wireless energy harvesting coil is wirelessly connected to the radio frequency receiver. The signal output end of the radio frequency receiver is connected to the human-computer interaction system through the data processing module.

[0030] Specifically, the pH sensor converts the analog voltage of the signal output into a digital signal through an analog-to-digital converter and transmits it to the microcontroller. Let the voltage signal output by the pH sensor be Vsensor, and the converted digital signal be Dsensor. Let the threshold range be PH min -PH max . Use logical operations to determine whether the pH value is within the set range:

[0031] If PHmin ≤ PHmeasured ≤ PH max , then output "pH value is normal";

[0032] Otherwise, output "pH value is abnormal";

[0033] Calibrate the sensor output to make the measurement results more accurate in different environments;

[0034] Let CalibrationFactor be the calibration coefficient;

[0035] Calibrate the digital signal output by the sensor:

[0036] D calibrated = D sensor ×CalibrationFactor

[0037] The calibrated pH value data is stored in a non-volatile memory. Let pH calibrated be the calibrated pH value, and the storage method is: EEPROM_write(pH calibrated ).

[0038] Specifically, the data processing module processes the data through a decoding algorithm and then transmits it to the human-computer interaction system. The data decoding algorithm is as follows: Assume that the data signal sent by the sensor module uses frequency modulation, and its frequency f modulated is linearly related to the pH value; the decoding algorithm is set as follows:

[0039] pH decoded = m × f modulated + c

[0040] where m is the slope used to convert the frequency to the pH value, and c is the intercept used to calibrate the decoded pH value; f modulated is the frequency of the received modulated signal, and pH decoded is the decoded pH value.

[0041] Example:

[0042] 1. Design of the passive pH value sensor module:

[0043] a. Composition of the sensor module:

[0044] pH sensor: A high-precision pH sensor is selected, which can stably measure the pH value.

[0045] Microcontroller: An ultra-low-power microcontroller is used for data processing and generation of control signals.

[0046] Memory: EEPROM is used as the non-volatile memory to store the calibrated pH value data.

[0047] Operation module: The signal is amplified through operations, and it is judged whether the pH value is within the set range through logical operations.

[0048] Frequency modulation module: Converts the pH value into a frequency signal for output.

[0049] Wireless energy harvesting coil: Used to wirelessly receive the energy sent by the reader module.

[0050] b. Data processing flow:

[0051] The pH sensor outputs an analog voltage signal V sensor .

[0052] The analog-to-digital converter converts V sensor into a digital signal D sensor .

[0053] Judge D through logical operation sensor whether it is within the set pH value range.

[0054] Calibrate D sensor to obtain the calibrated pH value pH calibrated and store it in the EEPROM.

[0055] 2. Reader module design:

[0056] a. Composition of the reader module:

[0057] Radio frequency energy emitter: Provide energy to the passive pH sensor module.

[0058] Radio frequency receiver: Receive the data signal sent from the sensor module.

[0059] Data processing module: Convert the received data signal into a pH value through a decoding algorithm.

[0060] Human-computer interaction system: Used for user interface interaction and data display.

[0061] b. Data processing flow:

[0062] Receive the data signal sent from the sensor module from the wireless energy harvesting coil.

[0063] The decoding algorithm converts the received frequency signal into a pH value pH decoded .

[0064] Transmit pH decoded to the human-computer interaction system for display.

[0065] 3. Application example:

[0066] Scene description:

[0067] Assume that in the field of wound monitoring, it is necessary to monitor the pH value of the wound to judge the situation of wound infection with bacteria.

[0068] Implementation steps:

[0069] The passive pH sensor module is designed to be installable at different positions on the wound. Each module contains a detection end that can directly contact the wound exudate to measure the pH value of the wound; the reader module is placed on other stable surfaces. When the reader module approaches the sensor module, a connection is established with the sensor module through wireless technology to provide energy to the sensor module and receive data from the sensor.

[0070] The doctor or nurse buries the detection end of the sensor module into the wound dressing to ensure sufficient contact with the wound exudate. When the reader module approaches the sensor module, a wireless connection is established between the sensor module and the reader module to ensure the stability of energy and data transmission. The sensor module collects the pH value of the wound in real time and transmits this data to the reader module via a wireless signal. The reader module receives the data signal from the sensor, decodes it, and calculates the real-time pH value of the wound. The human-machine interaction system displays the calculated pH value to the doctor or nurse to provide intuitive wound status information. Medical professionals evaluate the infection status of the wound based on the displayed pH value and adjust the treatment plan accordingly, such as cleaning the wound, changing the dressing, or adjusting the drug use, etc.

[0071] Through this passive pH sensing circuit, doctors can monitor the pH value of the wound in real time, take timely measures to adjust the wound treatment and nursing plan, and improve the wound healing efficiency and reduce the infection rate.

[0072] The above embodiments illustrate how to apply the technical solution based on the passive pH sensing circuit in the field of wound care to achieve real-time monitoring and management of the wound pH value, thereby improving the wound healing efficiency and reducing the infection rate.

[0073] The technical solution of the present invention is not limited to the limitations of the above specific embodiments. Any technical deformation made according to the technical solution of the present invention falls within the protection scope of the present invention.

Claims

1. A pH value sensing circuit, characterized in that: It comprises a passive pH sensor module and a reader module, wherein the passive pH sensor module is wirelessly powered by the reader module, and the passive pH sensor module transmits data to the reader module wirelessly, and there are multiple passive pH sensor modules, and the detection ends of the multiple passive pH sensor modules are connected to the object to be measured; The passive pH sensor module includes a pH sensor, a microcontroller, a memory, a computing module, a frequency modulation module and a wireless energy collection coil. The signal output end of the pH sensor is connected to the signal input end of the microcontroller, the detection end of the pH sensor is connected to the object to be measured, the control signal output end of the microcontroller is connected to the frequency modulation module, the control signal output end of the frequency modulation module is connected to the wireless energy collection coil, the signal output end of the wireless energy collection coil is connected to the signal input end of the microcontroller, the wireless energy collection coil is connected to the reader module wirelessly, the data transmission end of the microcontroller is connected to the memory, and the control signal output end of the microcontroller is connected to the frequency modulation module through the computing module; The reader module includes a radio frequency energy transmitter, a radio frequency receiver, a data processing module and a human-computer interaction system, wherein a control signal output terminal of the human-computer interaction system is connected to the radio frequency energy transmitter, the radio frequency energy transmitter is wirelessly connected to the wireless energy collection coil, the data output of the wireless energy collection coil is wirelessly connected to the radio frequency receiver, and the signal output terminal of the radio frequency receiver is connected to the human-computer interaction system through the data processing module; The data processing module processes the data through a decoding algorithm and transmits it to the human-computer interaction system. The data decoding algorithm is: assuming that the data signal sent by the sensor module adopts frequency modulation, and its frequency f modulated It is linearly related to pH value; the decoding algorithm is set as follows: pH decoded =m×f modulated +c Where m is the slope, which is used to convert the frequency into pH value, c is the intercept, which is used to calibrate the decoded pH value; f modulated is the frequency of the received modulation signal, pH decoded is the decoded pH value.

2. The pH value sensing circuit according to claim 1, characterized in that: The pH sensor converts the analog voltage output by the analog-to-digital converter into a digital signal and transmits it to the microcontroller. The voltage signal output by the pH sensor is Vsensor, the converted digital signal is Dsensor, and the threshold range is pH min -pH max , use logical operations to determine whether the pH value is within the set range: If pHmin≤pHmeasured≤pH max , then output "pH value is normal"; Otherwise, output "abnormal pH value"; Calibrate sensor output to make its measurement results more accurate in different environments; Let CalibrationFactor be the calibration factor; Calibrate the digital signal output by the sensor: D calibrated =D sensor ×CalibrationFactor The calibrated pH value data is stored in a non-volatile memory. calibrated The pH value after calibration, storage method: EEPROM_write(pH calibrated ).

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