Ozone concentration monitoring sensor

Abstract

The invention provides an ozone concentration monitoring sensor, which relates to the technical field of ozone concentration monitoring and comprises an electrochemical detection unit, a temperature compensation unit and a signal processing and output unit, the electrochemical detection unit is used for detecting ozone in air by utilizing an electrochemical principle and transmitting a detection signal to the signal processing and output unit; the temperature compensation unit is used for detecting the environment temperature and performing temperature compensation on a detection signal; and the signal processing and output unit converts the compensated signal into a digital signal and outputs the digital signal through the UART interface. By adopting an electrochemical detection technology, high-precision monitoring on the ozone concentration can be realized, the resolution ratio is less than or equal to 1ppb, and the monitoring requirement on low-concentration ozone is met; and the built-in temperature sensor can automatically carry out temperature compensation, so that stable output can be provided at different environment temperatures.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ozone concentration monitoring, in particular to an ozone concentration monitoring sensor. BACKGROUND

[0002] Ozone is a strong oxidizing gas, which is widely used in disinfection and sterilization, air purification, industrial oxidation and other fields. However, high concentration ozone has potential harm to human body and environment, so real-time and accurate monitoring of its concentration is very important. In the existing ozone detection technology, electrochemical sensors are widely used due to their small size, low cost and fast response speed. However, traditional electrochemical ozone sensors generally have the following problems: the detection accuracy is greatly affected by temperature, and there is no effective temperature compensation mechanism. Therefore, we improve it and propose an ozone concentration monitoring sensor. SUMMARY

[0003] The present application provides an ozone concentration monitoring sensor, which comprises an electrochemical detection unit, a temperature compensation unit, a signal processing and output unit; the electrochemical detection unit detects ozone in the air by electrochemical principle and transmits the detection signal to the signal processing and output unit; the temperature compensation unit is used for detecting the environmental temperature and compensating the detection signal; the signal processing and output unit converts the compensated signal into digital signal and outputs it through UART interface.

[0004] As a preferred technical solution of the present application, the temperature compensation unit is provided with a temperature sensor for automatically detecting the environmental temperature and compensating the detection signal according to a preset algorithm.

[0005] As a preferred technical solution of the present application, the UART interface output is 3.3V level, the baud rate is 9600, the data bit is 8 bits, the stop bit is 1 bit, and there is no check bit.

[0006] As a preferred technical solution of the present application, the working voltage range of the ozone concentration monitoring sensor is 3.7V-5.5V, the preheating time is zero, the response time is less than or equal to 60 seconds, the recovery time is less than or equal to 30 seconds, the range is 0-9999ppb, the resolution is less than or equal to 1ppb, and the test accuracy is ±10ppb or ±10% concentration value.

[0007] As a preferred technical solution of the present application, the working temperature range of the ozone concentration monitoring sensor is -20-50℃, the working humidity range is 15%RH-90%RH, and the storage temperature range is 0-40℃.

[0008] As a preferred technical solution of the present application, the size of the ozone concentration monitoring sensor is 17.8mm in length, 17.7mm in width and 9mm in height, and the pin pitch is 2.0mm.

[0009] As a preferred technical solution of the present application, the self-diagnosis unit is used for monitoring the working state of the components in real time, and outputs a fault code through the UART interface when an abnormality is detected.

[0010] As a preferred technical solution of the present application, the components monitored by the self-diagnosis unit include an electrochemical detection unit, a temperature compensation unit, and a signal processing and output unit, and the fault code corresponds to failure of the electrochemical detection unit, failure of the temperature sensor, and abnormality of the signal processing circuit.

[0011] As a preferred technical solution of the present application, the shell of the ozone concentration monitoring sensor is made of an anticorrosive material; the anticorrosive material is polytetrafluoroethylene or polyimide, and the surface of the shell is provided with a hydrophobic coating.

[0012] As a preferred technical solution of the present application, the ozone concentration monitoring sensor further has a built-in memory, which is used for recording ozone concentration monitoring data for at least 30 days, and the stored data is read through the UART interface.

[0013] Compared with the prior art, the present application has the following beneficial effects: In the scheme of the present application: The electrochemical detection technology adopted in the present application can realize high-precision monitoring of the ozone concentration, with a resolution of ≤1ppb, meeting the monitoring requirements for low-concentration ozone; and the built-in temperature sensor can automatically perform temperature compensation, ensuring stable output under different environmental temperatures. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The structure schematic diagram of the ozone concentration monitoring sensor provided in the present application is shown in the figure; Figure 2 The schematic diagram of the verification and calculation provided in the present application is shown in the figure. DETAILED DESCRIPTION

[0015] In order to enable the personnel in the technical field to better understand the present application scheme, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the personnel in the field without making creative efforts should belong to the protection scope of the present application.

[0016] It should be noted that the embodiments in the present application and the features and technical solutions in the embodiments can be combined with each other without conflict.

[0017] It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0018] The ozone concentration monitoring sensor of the embodiment 1 comprises an electrochemical detection unit, a temperature compensation unit, a signal processing and output unit; the electrochemical detection unit detects ozone in the air based on the electrochemical principle and transmits the detection signal to the signal processing and output unit; the temperature compensation unit detects the ambient temperature and compensates the detection signal; the signal processing and output unit converts the compensated signal into a digital signal and outputs it through the UART interface; the electrochemical detection unit works based on the electrochemical principle, which has high selectivity and sensitivity, can accurately identify ozone molecules in the air and detect them, and lays a foundation for obtaining accurate ozone concentration data; the addition of the temperature compensation unit is crucial because the change of the ambient temperature will interfere with the electrochemical detection process and affect the accuracy of the detection signal; by detecting the ambient temperature in real time and compensating the detection signal according to the preset algorithm, the error caused by the temperature factor can be effectively eliminated, and the sensor can output stable and reliable ozone concentration data under different ambient temperatures; the signal processing and output unit converts the compensated signal into a digital signal, which has the advantages of strong anti-interference ability, easy storage and processing, etc., and the output through the UART interface is convenient for connecting and data transmission with various host computers or control systems, improves the practicality and compatibility of the sensor, and can be widely used in ozone concentration monitoring scenes in different fields.

[0019] Further, the temperature compensation unit is built-in with a temperature sensor for automatically detecting the ambient temperature and compensating the detection signal according to the preset algorithm to ensure stable output under different ambient temperatures; the built-in temperature sensor can detect the ambient temperature in real time, continuously and accurately, without the need for additional external temperature detection equipment, simplifying the system structure and reducing the cost, and its automatic detection function enables the sensor to quickly respond to changes in the ambient temperature without manual intervention; the preset algorithm can use existing linear compensation algorithm or polynomial compensation algorithm.

[0020] Further, the UART interface output is 3.3V level, the baud rate is 9600, the data bit is 8 bits, the stop bit is 1 bit, and there is no check bit.

[0021] Further, the ozone concentration monitoring sensor has a working voltage range of 3.7V-5.5V, a preheating time of zero, a response time of ≤60 seconds, a recovery time of ≤30 seconds, a range of 0-9999ppb, a resolution of ≤1ppb, and a test accuracy of ±10ppb or ±10% concentration value (the larger one); for example, when the concentration is ≤100ppb, the accuracy is ±10ppb; when the concentration is >100ppb, the accuracy is ±10% concentration value. The wide working voltage range (3.7V-5.5V) enables the sensor to adapt to various power supply environments, whether it is a portable device powered by a battery or a large monitoring system powered by a fixed power supply, it can be easily adapted, improving the versatility and flexibility of the sensor in different devices; zero preheating time means that the sensor can be used immediately without waiting, saving time and energy, especially suitable for emergency monitoring scenarios that require rapid acquisition of ozone concentration data; shorter response time (≤60 seconds) and recovery time (≤30 seconds) ensure that the sensor can timely reflect the changes in ozone concentration, when the ozone concentration in the environment fluctuates rapidly, the sensor can quickly capture such changes and give accurate measurement results, while quickly recovering to the initial state after measurement, preparing for the next measurement; a larger range (0-9999ppb) can meet the needs of ozone concentration monitoring in different scenarios, whether it is low-concentration environmental air monitoring or high-concentration industrial waste gas emission monitoring; higher resolution (≤1ppb) can accurately distinguish small changes in ozone concentration, providing detailed data support for in-depth study of ozone concentration variation.

[0022] Further, the ozone concentration monitoring sensor has a working temperature range of -20-50℃, a working humidity range of 15%RH-90%RH (no condensation), and a storage temperature range of 0-40℃; the wide working temperature range (-20-50℃) enables the sensor to work normally in extreme cold and hot environmental conditions, whether it is cold winter in the north or hot summer in the south, it can run stably, greatly expanding the application geographical range of the sensor; the appropriate working humidity range (15%RH-90%RH, no condensation) ensures that the sensor is not affected in common humidity environments, avoiding problems such as water vapor condensation caused by too high humidity or static electricity caused by too low humidity, ensuring the normal work of the internal electronic components of the sensor, improving the reliability and stability of the sensor in humid or dry environments; the reasonable storage temperature range (0-40℃) helps to protect the performance of the sensor in the non-working state, preventing problems such as internal material aging and performance degradation caused by too high or too low temperature, prolonging the service life of the sensor and reducing the use cost.

[0023] Further, the ozone concentration monitoring sensor has a size of 17.8 mm in length, 17.7 mm in width, and 9 mm in height, and a pin pitch of 2.0 mm. The compact size (17.8 mm in length, 17.7 mm in width, and 9 mm in height) and appropriate pin pitch (2.0 mm) design make the sensor have a very high integration level, which can be easily integrated into various types of devices without occupying too much space, and is particularly suitable for portable instruments and smart home devices that have strict requirements on device size. This compact design helps to improve the overall compactness and portability of the device, making it convenient for users to carry and use. At the same time, for large equipment such as air quality monitoring equipment, air purifiers, and fresh air ventilation systems, the compact sensor also does not have a significant impact on the internal layout of the equipment, making it easy to install and maintain the equipment, reducing the difficulty of equipment design and production, and improving the market competitiveness of the product. Referring to Figure 1 , the pin definitions are as follows: Pin1 (Vin): voltage input (3.7V-5.5V), connected to the positive pole of the external power supply; Pin2 (UART_TXD): data output terminal, 3.3V level, connected to the RXD of the host computer; Pin3 (UART_RXD): data input terminal, 3.3V level, connected to the TXD of the host computer; Pin4 (GND): power ground, connected to the negative pole of the external power supply; Pin5-Pin11: suspended. For the suspended Pin5-Pin11, the user is provided with the possibility of expansion, and the user can add additional functional circuits to these pin terminals according to actual needs, further enhancing the flexibility and expandability of the sensor.

[0024] Further, it also includes a self-diagnosis unit, which is used to monitor the working state of the components in real time and output fault codes through the UART interface when an abnormality is detected. The self-diagnosis unit can monitor the working state of each component of the sensor in real time and continuously, and can timely discover potential problems and hidden troubles. Once an abnormality is detected, the fault code is output through the UART interface, so that the user can quickly understand the location and nature of the problem of the sensor, without the need for complex troubleshooting work, which shortens the fault diagnosis time and improves the maintenance efficiency. This is particularly suitable for some applications that have high requirements on the continuity of ozone concentration monitoring, such as environmental monitoring in industrial production processes, which can timely resume monitoring work and avoid data loss and production interruption caused by sensor failure, ensuring the normal operation of production and continuous monitoring of the environment.

[0025] Further, the components monitored by the self-diagnosis unit include the electrochemical detection unit, the temperature compensation unit, and the signal processing and output unit, and the fault codes correspond to failure of the electrochemical detection unit, temperature sensor failure, and abnormality of the signal processing circuit; different fault codes are set for faults of different components, so that the user can accurately understand the specific position and cause of the fault, avoid blind repair and replacement of components, and improve the accuracy and efficiency of fault handling; for example, when the fault code of failure of the electrochemical detection unit occurs, the user can check the electrodes, electrolyte, and other components of the electrochemical detection unit; if it is a temperature sensor failure code, the temperature sensor and its connecting line are checked; for the fault code of abnormality of the signal processing circuit, the circuit of the signal processing and output unit is checked; this precise fault positioning method helps to quickly restore the normal operation of the sensor, reduces the maintenance cost and time cost, and further guarantees the reliability and stability of the sensor; Fault examples: Further, the shell of the ozone concentration monitoring sensor is made of an anti-corrosion material, which can effectively resist corrosion of ozone and other common pollutants, prolonging the service life of the sensor; the anti-corrosion material is polytetrafluoroethylene or polyimide, and the shell surface is provided with a hydrophobic coating to prevent water vapor condensation from affecting performance; polytetrafluoroethylene or polyimide is used to make the shell, which has excellent chemical stability and corrosion resistance, can effectively resist the corrosion of common pollutants such as ozone, sulfur dioxide, and nitrogen oxides, and protects the sensitive electronic components and detection components inside the sensor from damage, greatly prolonging the service life of the sensor and reducing the use cost; the hydrophobic coating on the surface of the shell can be polydimethylsiloxane, which can make water vapor form water droplets on its surface and quickly roll off, preventing water vapor from condensing into a water film and adhering to the surface of the sensor.

[0026] Further, the ozone concentration monitoring sensor also has a built-in memory, which is used to record ozone concentration monitoring data for at least 30 days, and the stored data is read through a UART interface; the default sampling frequency of the built-in memory is 1 time per second, each data record contains a timestamp (4 bytes) and a concentration value (2 bytes), the daily data volume is about 518.4KB (6 bytes / time x 86400 times / day), and the total capacity of 30 days is about 15.5MB, which needs to match the actual capacity of the memory; The built-in memory can automatically record ozone concentration monitoring data for at least 30 days, providing users with rich historical data resources; these data are of great significance for analyzing the trend of ozone concentration, studying the rules of ozone pollution, and evaluating environmental quality; for example, by analyzing long-term sequence ozone concentration data, the characteristics of ozone concentration changes in different seasons and different time periods can be understood, providing a scientific basis for developing targeted pollution prevention measures; reading stored data through the UART interface is convenient and fast, without the need to disassemble the sensor from the device or use additional data reading equipment, users can directly use the host computer software to communicate with the sensor through the UART interface, easily obtain stored historical data, and further process and analyze the data.

[0027] In Example 2, the ozone concentration monitoring sensor provided in Example 1 is further optimized, and the communication protocol of the ozone concentration monitoring sensor includes: 1. General settings, as shown in the following table; 2. Communication commands; communication is divided into active uploading and question and answer, the default is active uploading when leaving the factory, and the concentration value is sent once every 1S; If the user switches to the question and answer mode and needs to switch to active uploading, the command line format shown in the following table can be sent: The data display format of active uploading is as follows: Note: Gas concentration value (PPB) = (gas concentration high * 256 + gas concentration low), when converted to PPM: PPM = PPB / 1000, 1 PPM ozone is equivalent to 2.14 mg / m3. 1 mg / m3 ozone is equivalent to 0.47 PPM.

[0028] When the user needs the question and answer mode, the active uploading data can be closed by sending the following command format, and then sending the concentration reading command; the command line format for closing active uploading is as follows: In the question and answer mode, the concentration reading command format is as follows: The returned sensor concentration value display format is as follows: Gas concentration value ppb = gas concentration high * 256 + gas concentration low.

[0029] 3. Checksum calculation, refer to Figure 2 4. Cross-interference characteristics: The anti-interference performance of the sensor module is excellent. Most of the gases other than the target gas have no response. The response characteristics of the sensor to several common interfering gases are listed in the following table for reference. The data in the table are typical responses of the gases at a given concentration. In the present application, unless otherwise clearly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The preferred embodiments of the present application are given in the drawings, but do not limit the patent scope of the present application. The present application can be realized in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some of the technical features. Any equivalent structure made by using the content of the present application specification and drawings, directly or indirectly applied to other related technical fields, is also within the patent protection scope of the present application.

Claims

1. An ozone concentration monitoring sensor, characterized by, The ozone concentration monitoring sensor comprises an electrochemical detection unit, a temperature compensation unit, a signal processing and output unit; the electrochemical detection unit detects ozone in the air by using electrochemical principle and transmits the detection signal to the signal processing and output unit; the temperature compensation unit is used for detecting the ambient temperature and compensating the detection signal; and the signal processing and output unit converts the compensated signal into a digital signal and outputs the digital signal through a UART interface.

2. The ozone concentration monitoring sensor according to claim 1, characterized by, The temperature compensation unit is internally provided with a temperature sensor, which is used for automatically detecting the ambient temperature and compensating the detection signal according to a preset algorithm.

3. The ozone concentration monitoring sensor according to claim 1, wherein The UART interface output is a 3.3V level, the baud rate is 9600, the data bit is 8 bits, the stop bit is 1 bit, and there is no check bit.

4. The ozone concentration monitoring sensor according to claim 1, wherein The working voltage range of the ozone concentration monitoring sensor is 3.7V-5.5V, the preheating time is zero, the response time is less than or equal to 60 seconds, the recovery time is less than or equal to 30 seconds, the range is 0-9999ppb, the resolution is less than or equal to 1ppb, and the test accuracy is ±10ppb or ±10% concentration value.

5. The ozone concentration monitoring sensor according to claim 1, wherein The working temperature range of the ozone concentration monitoring sensor is -20-50℃, the working humidity range is 15%RH-90%RH, and the storage temperature range is 0-40℃.

6. The ozone concentration monitoring sensor according to claim 1, wherein The size of the ozone concentration monitoring sensor is 17.8mm in length, 17.7mm in width and 9mm in height, and the pin pitch is 2.0mm.

7. The ozone concentration monitoring sensor according to claim 1, wherein The ozone concentration monitoring sensor further comprises a self-diagnosis unit, which is used for monitoring the working state of components in real time and outputting a fault code through the UART interface when an abnormality is detected.

8. The ozone concentration monitoring sensor according to claim 7, characterized in that, The components monitored by the self-diagnosis unit include the electrochemical detection unit, the temperature compensation unit and the signal processing and output unit, and the fault code corresponds to the failure of the electrochemical detection unit, the failure of the temperature sensor and the abnormality of the signal processing circuit.

9. The ozone concentration monitoring sensor according to claim 1, wherein The shell of the ozone concentration monitoring sensor is made of a corrosion-resistant material; the corrosion-resistant material is polytetrafluoroethylene or polyimide, and the shell surface is provided with a hydrophobic coating.

10. The ozone concentration monitoring sensor according to claim 1, wherein The ozone concentration monitoring sensor further has a built-in memory, which is used for recording ozone concentration monitoring data for at least 30 days, and the stored data is read through the UART interface.

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