Digital pressure sensor online correction method and system based on digital calibration certificate
Through a digital calibration certificate-based method, combined with an edge processing system and a measurement management system, the online correction of digital pressure sensor measurement data is solved, and the problem of difficult data storage and utilization of traditional paper certificates is solved, ensuring the accuracy and reliability of measurement results, and improving product quality and manufacturing efficiency.
Patent Information
- Application Number
- CN202411597430.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2044-11-11
AI Technical Summary
Traditional paper certificates are difficult to store and utilize data in a structured manner, which limits the accumulation and application of metrological calibration data. Especially in the measurement results of digital pressure sensors, environmental factors and aging cause measurement results to deviate from the true value and require online correction to improve product quality.
Using a digital calibration certificate based method, the digital calibration certificate in XML format and the electronic calibration certificate in PDF format are combined with an edge processing system and a measurement management system to realize online correction of the measurement data of the digital pressure sensor. The system includes data extraction, model construction and data correction modules. It uses machine learning and deep learning technology to automatically identify units and build correction models to achieve automatic correction of measurement data.
Through online correction, we ensure the accuracy and reliability of the measurement results of digital pressure sensors, improve product manufacturing efficiency and product quality in the intelligent manufacturing process, and realize bottom-up reconstruction and deep integration of data.
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Figure CN119803773A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to an online correction method and system for a digital pressure sensor based on a digital calibration certificate, belonging to the technical field of measurement and testing. Background Art
[0002] With the continuous advancement of the digital transformation of my country's manufacturing industry, new technologies such as artificial intelligence, 5G, and the Internet of Things are constantly being applied to all aspects of processing and manufacturing. A large number of digital pressure sensors and measuring instruments use the Internet and the Internet of Things as carriers to build a large-scale sensor network, realizing intelligent perception and monitoring of all links in the entire life cycle of the product. However, during the processing and manufacturing process, information such as ambient temperature, pressure, and humidity will have a great impact on the measurement results of digital pressure sensors, and the normal aging of digital pressure sensors will also cause the measurement results to deviate from the true value. Therefore, combining calibration data to realize the correction of digital pressure sensor performance, especially online correction, is of great significance to improving online monitoring and traceability of product quality.
[0003] Traditional paper certificates limit the storage and utilization of certificate data structure, especially when the certificate contains key data information. Traditional paper certificates make it difficult to establish a clear calibration chain and limit the accumulation and mining of metrological calibration data. Although electronic calibration certificates have promoted the electronic transformation of paper certificates to a certain extent, they still have not solved the large-scale accumulation and comprehensive utilization of valid data segments in certificates.
[0004] Digital calibration certificates leverage the machine-readable advantages of the XML format to establish easy-to-read and easy-to-use digital calibration information for key measuring equipment / digital pressure sensors in the digital manufacturing and generation process. At the same time, combined with machine learning, deep learning and other methods, they can quickly and effectively realize the comprehensive application of equipment metrology and calibration data, accelerate the deep integration of metrology and measurement technologies, and ultimately achieve a bottom-up reconstruction of the data assurance system during the digital transformation process. Summary of the invention
[0005] The purpose of the present invention is to provide a method and system for online correction of a digital pressure sensor based on a digital calibration certificate, which fully utilizes the machine-readable advantage of the data calibration certificate, combines the calibration data with the digital pressure sensor measurement process, realizes online correction of the digital pressure sensor measurement data, ensures the accuracy and reliability of the digital pressure sensor measurement results, and improves the manufacturing efficiency and product quality of products in the intelligent manufacturing process.
[0006] The objective of the present invention is achieved through the following technical solutions:
[0007] The online correction method of a digital pressure sensor based on a digital calibration certificate disclosed in the present invention is implemented based on an edge processing system and includes the following steps:
[0008] Step 1: The user unit sends the digital pressure sensor used for measurement to the metrology agency for calibration. After the metrology agency completes the calibration of the digital pressure sensor, it generates a corresponding calibration certificate. The calibration certificate contains a digital calibration certificate for machine reading and an electronic calibration certificate for human reading. The digital calibration certificate is in XML format, and the electronic calibration certificate is in PDF format. Both different types of certificates are credible and can be verified with each other.
[0009] Step 2: The user unit uploads the obtained digital calibration certificate and electronic calibration certificate to the user unit's measurement management system, and the measurement management system is connected to the edge processing system to realize batch management of digital calibration certificates and electronic certificates and management of measurement results;
[0010] Step 3: The edge processing system accesses the measurement management system, identifies the digital calibration certificate related to the digital pressure sensor connected to the edge processing system, and downloads and stores it to the data storage module of the digital pressure sensor edge processing system.
[0011] Step 4: The digital calibration certificate in XML format is parsed through the data extraction module of the edge processing system to extract the basic information of the digital pressure sensor in the digital calibration certificate and the measured value and standard value in the measurement data. The basic information of the digital pressure sensor is mainly used to match the calibration certificate with the real sensor, and the measurement data is mainly used to build the correction model.
[0012] Step 4.1. The basic information of the calibrated digital pressure sensor is stored in the item under administrativeData. The manufacturer of the measuring device is stored in the manufacturer field of the digital calibration certificate. The model of the measuring device is stored in the model field of the digital calibration certificate. The serial number of the measuring device is stored in the identifications field of the digital calibration certificate. The calibration result information of the digital pressure sensor is stored in the measurementResults part of the digital calibration certificate. The measured values and standard values of different measuring points can be obtained by querying the results field.
[0013] Step 4.2: The edge processing system associates and stores the basic information and value representation of the pressure sensors connected to each port.
[0014] Step 5: The calibration result information in the storage module is preprocessed and modeled by the model building module of the edge processing system. The correction model of the digital pressure sensor includes a linear model and a nonlinear model. The correction model is selected by manual setting or automatically selected by the error of model fitting.
[0015] Step 5.1. Match and analyze the digital calibration certificate data set D with the edge processing system port data set M, clarify the unit representation of the pressure value of each port, and automatically convert the pressure units to ensure that the units of the measured value of the pressure sensor and the calibration result data are consistent.
[0016] Step 5.2: Model the pressure correction model based on the calibration result information after unit conversion.
[0017] Step 6: Combine the matching results of the digital calibration certificate dataset D and the edge processing system port dataset M to achieve automatic matching between the correction model and the edge processing system. If it is a manual correction mode, directly select the corresponding linear model or second-order model for correction; if it is an automatic correction mode, compare the linear model and the second-order model To determine the quality of the model, select R 2 The value less than the preset criterion is used as the correction model. The corrected measurement data is further transmitted to the measurement management system.
[0018] The digital pressure sensor online correction system based on digital calibration certificate disclosed in the present invention is used to implement the above-mentioned digital pressure sensor online correction method based on digital calibration certificate. The digital pressure sensor online correction system based on digital calibration certificate is an edge processing system, including seven parts: power supply module, data acquisition module, data storage module, data transmission module, data extraction module, model construction module and data correction module.
[0019] The power supply module is mainly used for power supply, and the power supply voltage is 12V, which is realized through USB, network port, separate power supply interface, etc.
[0020] The data acquisition module is connected to the digital pressure sensor at the measurement site and is mainly used to realize the acquisition of measurement data of the digital pressure sensor. The sampling rate is adjusted by the host computer, and the measurement data is transmitted to the data correction module for correction.
[0021] The data storage module is mainly used to store the digital calibration certificate, the digital calibration certificate data set and the edge processing system port data set downloaded from the measurement management system.
[0022] The data transmission module is mainly used to realize the communication between the edge processing system and the measurement management system and the on-site measurement digital pressure sensor, and to realize the download of the device digital certificate, the transmission of the digital pressure sensor measurement data and the corrected measurement data;
[0023] The data extraction module is mainly used to extract the basic information of the digital pressure sensor such as the manufacturer, specification model, serial number, etc. of the digital pressure sensor in the calibration certificate in XML format by developing a corresponding data parsing module. In addition, it also realizes the extraction of calibration result information in the digital calibration certificate, including measurement values and standard values.
[0024] The model building module mainly performs automatic unit conversion on the measured value and standard value in the calibration result information extracted from the digital calibration certificate, and builds a correction model for the pressure measurement value based on the two types of data. The constructed model library contains linear models and nonlinear models. The model selection includes automatic selection and manual selection. The automatic selection is mainly based on the R in the model fitting process. 2 Value as basis.
[0025] The data correction module realizes automatic correction of measurement data by matching the port information stored in the edge processing system with the manufacturer, model, and serial number in the digital calibration certificate, and then transmits the corrected data to the measurement management system.
[0026] Furthermore, the measurement management system is mainly used for the management of the measurement site, realizing the comprehensive management of the measurement sensor status information, sensor basic information, and sensor field measurement data. The measurement sensor status information includes use, maintenance, and borrowing. The measurement sensor basic information includes sensor model specifications, storage location, and responsible person.
[0027] Beneficial effects:
[0028] 1. The online correction method and system of a digital pressure sensor based on a digital calibration certificate disclosed in the present invention adopt an automatic conversion method based on digital values. Based on the setting of the digital pressure sensor unit and the value representation of the digital calibration certificate, the unit of the measurement data and the calibration data is automatically identified to perform automatic conversion of the value unit, thereby realizing the digital representation of the value and improving the accuracy of the online correction of the digital pressure sensor.
[0029] 2. The online correction method and system of digital pressure sensors based on digital calibration certificates disclosed in the present invention adopt an automatic parsing method based on digital calibration certificate data, combined with the advantage of machine readability of digital calibration certificates, to achieve the extraction of digital pressure sensor manufacturer, model, serial number, and calibration results in the digital calibration certificate, providing key data support for the online correction of digital pressure sensors.
[0030] 3. The online correction method and system of the digital pressure sensor based on the digital calibration certificate disclosed in the present invention adopts linear and nonlinear methods to construct different types of model correction methods based on the measurement values and standard values in the calibration result information of the digital calibration certificate, and can select the model by manual selection and automatic selection of the model, thereby ensuring the accuracy and reliability of the measurement results of the digital pressure sensor and providing a basis for the correction of the measurement data of the digital pressure sensor.
[0031] 4. The online correction method and system for digital pressure sensors based on digital calibration certificates disclosed in the present invention realize the association between the correction model and the measurement results of the digital pressure sensor through automatic matching of the digital calibration certificate information set and the edge processing system information set, realize automatic correction of the measurement results, and improve the manufacturing efficiency and product quality of products in the intelligent manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] Figure 1 This is the edge processing system architecture diagram;
[0033] Figure 2 It is a flow chart of data processing in edge processing system;
[0034] Figure 3 The flowchart is a method for online correction of digital pressure sensor based on digital calibration certificate. DETAILED DESCRIPTION
[0035] In order to better illustrate the purpose and advantages of the present invention, the invention is further described below with reference to the accompanying drawings and examples.
[0036] Embodiment 1:
[0037] The digital pressure sensor online correction system based on the digital calibration certificate disclosed in this embodiment is an edge processing system, including seven parts: power supply module, data acquisition module, data storage module, data transmission module, data extraction module, model building module and data correction module. The peripheral system includes a measurement management system and a sensor.
[0038] The power supply module is mainly used to realize power supply to other modules of the edge processing system. The power supply voltage is 12V, which can be realized through USB, network port, separate power supply interface, etc.
[0039] The data acquisition module is connected to the digital pressure sensor at the measurement site and is mainly used to realize the acquisition of measurement data of the digital pressure sensor. The sampling rate is adjusted by the host computer, and the measurement data is transmitted to the data correction module for correction.
[0040] The data storage module is mainly used to store the digital calibration certificate, the digital calibration certificate data set and the edge processing system port data set downloaded from the measurement management system.
[0041] The data transmission module is mainly used to realize the communication between the edge processing system and the measurement management system and the on-site measurement digital pressure sensor, and to realize the download of the device digital certificate, the transmission of the digital pressure sensor measurement data and the corrected measurement data;
[0042] The data extraction module is mainly used to extract the basic information of the digital pressure sensor such as the manufacturer, specification model, serial number, etc. of the digital pressure sensor in the calibration certificate in XML format by developing a corresponding data parsing module. In addition, it can also extract the calibration result information in the digital calibration certificate, including the measured value and the standard value.
[0043] The model building module mainly performs automatic unit conversion on the measured value and standard value in the calibration result information extracted from the digital calibration certificate, and builds a correction model for the pressure measurement value based on the two types of data. The constructed model library contains linear models and nonlinear models. The model selection includes automatic selection and manual selection. The automatic selection is mainly based on the R in the model fitting process. 2 Value as basis.
[0044] The data correction module realizes automatic correction of measurement data by matching the port information stored in the edge processing system with the manufacturer, model, and serial number in the digital calibration certificate, and then transmits the corrected data to the measurement management system.
[0045] The measurement management system is mainly used for the management of enterprise measurement sites, and realizes the comprehensive management of enterprise measurement sensor status information, sensor basic information, and sensor field measurement data. The measurement sensor status information includes use, maintenance, and borrowing. The measurement sensor basic information includes sensor model specifications, storage location, and responsible person.
[0046] The edge processing system communicates information with the enterprise measurement management system and sensors to achieve communication and control of the sensors and measurement management system.
[0047] like Figure 3 As shown, the online correction method for a digital pressure sensor based on a digital calibration certificate disclosed in this embodiment has the following specific implementation steps:
[0048] Step 1: The user unit sends the digital pressure sensor used for measurement to the metrology agency for calibration. After the metrology agency completes the calibration of the digital pressure sensor, it generates a corresponding calibration certificate. The calibration certificate contains a digital calibration certificate for machine reading and an electronic calibration certificate for human reading. The digital calibration certificate is in XML format, and the electronic calibration certificate is in PDF format. Both different types of certificates are credible and can be verified with each other.
[0049] Step 2: The user unit uploads the obtained digital calibration certificate and electronic calibration certificate to the user unit's measurement management system. The measurement management system is connected to the edge processing system to realize batch management of digital calibration certificates and electronic certificates and management of measurement results.
[0050] Step 3: The edge processing system accesses the measurement management system, identifies the digital calibration certificate related to the digital pressure sensor connected to the edge processing system, and downloads and stores it to the data storage module of the digital pressure sensor edge processing system.
[0051] Step 4: The digital calibration certificate in XML format is parsed through the data extraction module of the edge processing system to extract the basic information of the digital pressure sensor in the digital calibration certificate and the measured value and standard value in the measurement data. The basic information of the digital pressure sensor is mainly used to match the calibration certificate with the real sensor, and the measurement data is mainly used to build the correction model.
[0052] Step 4.1. The basic information of the calibrated digital pressure sensor is stored in the item under administrativeData. The manufacturer of the measuring device is stored in the manufacturer field of the digital calibration certificate. The model of the measuring device is stored in the model field of the digital calibration certificate. The serial number of the measuring device is stored in the identifications field of the digital calibration certificate.
[0053] The calibration result information of the digital pressure sensor is stored in the measurementResults part of the digital calibration certificate. The measured values and standard values of different measuring points can be obtained by querying the results field.
[0054] The basic information of the pressure sensor and the calibration result information in the digital calibration certificate are stored in the form of data pairs, which are expressed as follows:
[0055] D={(m a1 ,m o1 ,i d1 ,y m1 ,y s1 ),(m a2 ,m o2 ,i d2 ,y m2 ,y s2 ),…,(m ai ,m oi ,i di ,y mi ,y si ),…,(m an ,m on ,i dn ,ymn ,y sn )}
[0056] in,
[0057] m ai is the manufacturer information of the digital pressure sensor in the i-th digital calibration certificate;
[0058] m oi is the model information of the digital pressure sensor in the i-th digital calibration certificate;
[0059] i di is the serial number information of the digital pressure sensor in the i-th digital calibration certificate;
[0060] y mi is the measured value of the digital pressure sensor in the i-th digital calibration certificate;
[0061] y si is the standard value of the digital pressure sensor in the i-th digital calibration certificate;
[0062] Step 4.2: The edge processing system associates and stores the basic information and value representation of the pressure sensors connected to each port in the form of data pairs.
[0063] M={(p1,m ar1 ,m or1 ,i dr1 ,e s1 ),(p2,m ar2 ,m or2 ,i dr2 ,e s2 ),…,(p i ,m ari ,m ori ,i dri ,e si ),…,(p n ,m arn ,m orn ,i drn ,e srn )}
[0064] in,
[0065] m ari Manufacturer information of the digital pressure sensor connected to the i-th port of the edge processing system;
[0066] m ori Model information of a digital pressure sensor connected to the i-th port of the edge processing system;
[0067] i driSerial number information of the digital pressure sensor connected to the i-th port of the edge processing system;
[0068] p i is the i-th port information of the edge processing system;
[0069] e si is the unit expression of the pressure value of the ith port of the edge processing system;
[0070] Step 5: The model building module is mainly used to pre-process the calibration result information in the storage module and build a model. The correction model of the digital pressure sensor mainly adopts a linear model, a nonlinear model, etc. The selection of the correction model can be manually set or automatically selected according to the error of model fitting.
[0071] Step 5.1. Match and analyze the digital calibration certificate data set D with the edge processing system port data set M, clarify the unit representation of the pressure value of each port, and automatically convert the pressure units to ensure that the units of the measured value of the pressure sensor and the calibration result data are consistent.
[0072] y fm =ky m
[0073] y fs =ky s
[0074] Among them, y fm is the conversion value of the calibration result measurement value, y fs is the conversion value of the calibration result standard value, y m is the measured value in the calibration result, y s is the standard value in the calibration result, and k is the unit conversion factor.
[0075] The calibration result information is automatically converted to
[0076] R={(y fm1 ,y fs1 ),(y fm2 ,y fs2 ),…,(y fmi ,y fsi ),…,(y fmn ,y fsn )}
[0077] Step 5.2: Model the pressure correction model based on the calibration result information after unit conversion. The actual value of the measurement result of the specific digital pressure sensor should be
[0078] y=y rm +f(y fmj ,y fsj )
[0079] Among them, y is the correction value of the digital pressure sensor, y rm is the true value of the digital pressure sensor, y fmj is the measured value of the jth calibration result within the measurement range, y fsj is the true measurement value of the jth calibration result within the measurement range, f(y fmj ,y fsj ) is a function representation of the correction amount of the measured value. fmj ,y fsj ) can be a variety of models such as linear and nonlinear. For the same digital pressure sensor, when enough metrological calibration data is accumulated, machine learning can also be used to train the calibration data.
[0080] The form of the linear model can take the following form:
[0081] f(y fmj ,y fsj )=a(y fmj -y fsj )+b
[0082] Among them, a and b are model parameters.
[0083] The second-order model can take the following form:
[0084] f(y fmj ,y fsj )=a(y fmj -y fsj ) 2 +b(y fmj -y fsj )+c
[0085] Among them, a, b and c are model parameters.
[0086] Step 6: Combine the matching results of the digital calibration certificate data set D and the edge processing system port data set M to achieve automatic matching between the correction model and the edge processing system. If it is a manual correction mode, directly select the corresponding linear model or second-order model for correction;
[0087] If it is in automatic correction mode, by comparing the linear model and the second-order model To determine the quality of the model, select R 2 The smaller value is used as the modified model.
[0088] Furthermore, the corrected measurement data is transmitted to a measurement management system.
[0089] The specific description above further illustrates the purpose, technical solutions and beneficial effects of the invention in detail. It should be understood that the above is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. An online correction method for a digital pressure sensor based on a digital calibration certificate, characterized in that: Based on the edge processing system, it includes the following steps: Step 1: The user unit sends the digital pressure sensor used for measurement to the metrology agency for calibration. After the metrology agency completes the calibration of the digital pressure sensor, it generates a corresponding calibration certificate; the calibration certificate includes a digital calibration certificate for machine reading and an electronic calibration certificate for human reading; the digital calibration certificate adopts XML format, and the electronic calibration certificate adopts PDF format; both different types of certificates are credible and can be mutually verified; Step 2: The user unit uploads the obtained digital calibration certificate and electronic calibration certificate to the measurement management system, and the measurement management system implements batch management of digital calibration certificates and electronic certificates; Step 3: The edge processing system accesses the measurement management system, identifies the digital calibration certificate related to the digital pressure sensor connected to the edge processing system, and downloads and stores it to the data storage module of the edge processing system of the digital pressure sensor; Step 4: The digital calibration certificate in XML format is parsed by the data extraction module of the edge processing system to extract the basic information of the digital pressure sensor in the digital calibration certificate and the measured value and standard value in the measurement data; the basic information of the digital pressure sensor is mainly used to match the calibration certificate with the real sensor, and the measurement data is mainly used to build the correction model; Step 5: Preprocess the calibration result information in the storage module and perform modeling through the model building module of the edge processing system. The correction model of the digital pressure sensor includes a linear model and a nonlinear model. Step 6: Combine the matching results of the digital calibration certificate dataset D and the edge processing system port dataset M to achieve automatic matching between the correction model and the edge processing system. If it is a manual correction mode, directly select the corresponding linear model or second-order model for correction; if it is an automatic correction mode, compare the linear model and the second-order model To determine the quality of the model, select R 2 The value smaller than the preset criterion is used as the correction model, and the corrected measurement data is further transmitted to the measurement management system.
2. The method for online correction of a digital pressure sensor based on a digital calibration certificate as claimed in claim 1, characterized in that: Step 4 is implemented as follows: Step 4.1, the basic information of the calibrated digital pressure sensor is stored in the item under administrativeData, the manufacturer of the measuring device is stored in the manufacturer field of the digital calibration certificate, the model of the measuring device is stored in the model field of the digital calibration certificate, and the serial number of the measuring device is stored in the identifications field of the digital calibration certificate; The calibration result information of the digital pressure sensor is stored in the measurementResults part of the digital calibration certificate. The measured values and standard values of different measuring points can be obtained by querying the results field. Step 4.2: The edge processing system associates and stores the basic information and value representation of the pressure sensors connected to each port.
3. The method for online correction of a digital pressure sensor based on a digital calibration certificate as claimed in claim 2, characterized in that: Step 5 is implemented as follows: Step 5.1, match and analyze the digital calibration certificate data set D with the edge processing system port data set M, clarify the unit representation of the pressure value of each port, and automatically convert the pressure unit to ensure that the measurement value of the pressure sensor and the calibration result data have the same unit; Step 5.2: Model the pressure correction model based on the calibration result information after unit conversion.
4. The method for online correction of a digital pressure sensor based on a digital calibration certificate as claimed in claim 3, characterized in that: In step 5, the correction model is selected by manual setting or automatically selected through the error of model fitting.
5. An online correction system for a digital pressure sensor based on a digital calibration certificate, used to implement an online correction method for a digital pressure sensor based on a digital calibration certificate as claimed in claim 1, 2, 3 or 4, characterized in that: The digital pressure sensor online correction system based on digital calibration certificate is an edge processing system, including seven parts: power supply module, data acquisition module, data storage module, data transmission module, data extraction module, model building module and data correction module; The power supply module is mainly used to realize power supply; The data acquisition module is connected to the digital pressure sensor at the measurement site, and is mainly used to realize the acquisition of measurement data of the digital pressure sensor. The sampling rate is adjusted by the host computer, and the measurement data is transmitted to the data correction module for correction; The data storage module is mainly used to store the digital calibration certificate, digital calibration certificate data set and edge processing system port data set downloaded from the measurement management system; The data transmission module is mainly used to realize the communication between the edge processing system and the measurement management system and the on-site measurement digital pressure sensor, and to realize the download of the device digital certificate, the transmission of the digital pressure sensor measurement data and the corrected measurement data; The data extraction module is mainly used to extract the basic information of the digital pressure sensor from the calibration certificate in XML format by developing a corresponding data parsing module. In addition, it also extracts the calibration result information from the digital calibration certificate, including the measured value and the standard value; the basic information of the digital pressure sensor includes the manufacturer, specification model, and serial number; The model building module mainly performs automatic unit conversion on the measured value and standard value in the calibration result information extracted from the digital calibration certificate, and builds a correction model for the pressure measurement value based on the two types of data. The constructed model library contains linear models and nonlinear models. The model selection includes automatic selection and manual selection. The automatic selection is mainly based on the R in the model fitting process. 2 Value as basis; The data correction module realizes automatic correction of measurement data by matching the port information stored in the edge processing system with the manufacturer, model, and serial number in the digital calibration certificate, and then transmits the corrected data to the measurement management system.
6. The digital pressure sensor online correction system based on digital calibration certificate as claimed in claim 5, characterized in that: The power supply module has a supply voltage of 12V, which is realized through USB, network port, and a separate power supply interface.
7. The digital pressure sensor online correction system based on digital calibration certificate as claimed in claim 5, characterized in that: The measurement management system is mainly used for the management of the measurement site, realizing the comprehensive management of the measurement sensor status information, sensor basic information, and sensor field measurement data; the measurement sensor status information includes use, maintenance, and borrowing; the measurement sensor basic information includes sensor model specifications, storage location, and responsible person.
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