Digital pressure sensor online correction method and system based on digital calibration certificate

Abstract

The application relates to an online correction method and system of a digital pressure sensor based on a digital calibration certificate, and belongs to the field of measurement and testing.The system is an edge processing system, which comprises a power supply module, a data acquisition module, a data storage module, a data transmission module, a data extraction module, a model construction module and a data correction module.An automatic conversion method based on a digital value is adopted, the units of measurement data and calibration data are automatically recognized based on the setting of a digital pressure sensor unit and the value expression of a digital calibration certificate, the value units are automatically converted, and the value is digitally expressed.The machine-readable characteristics of the digital calibration certificate are used to automatically extract sensor basic information and calibration result information, the extracted information is associated with previously set port connection information and value expression information, the value expression is automatically converted, a correction model of the measurement value of the digital pressure sensor is constructed, and the pressure measurement values of all the measurement ports of the edge processing system are online corrected.

Description

Technical Field

[0001] This invention relates to an online correction method and system for digital pressure sensors based on digital calibration certificates, belonging to the field of metrology and testing technology. Background Technology

[0002] With the continuous advancement of digital transformation in my country's manufacturing industry, new technologies such as artificial intelligence, 5G, and the Internet of Things are increasingly being applied to all aspects of processing and manufacturing. A massive number of digital pressure sensors and measuring instruments, using the Internet and the Internet of Things as carriers, have formed a large-scale sensor network, enabling intelligent sensing and monitoring of all stages throughout the product's lifecycle. However, during the processing and manufacturing process, environmental factors such as temperature, pressure, and humidity can significantly affect the measurement results of digital pressure sensors, and normal aging of digital pressure sensors can also cause the measurement results to deviate from the true values. Therefore, combining calibration data to correct the performance of digital pressure sensors, especially online correction, is of great significance for improving online monitoring and traceability of product quality.

[0003] Traditional paper certificates limit the structured storage and utilization of certificate data, especially when the certificate contains critical data. Traditional paper certificates struggle to establish clear calibration chains and restrict the accumulation and application of metrological calibration data. While electronic calibration certificates have advanced the digital transformation of paper certificates to some extent, they still haven't solved the problem of large-scale accumulation and comprehensive utilization of valid data segments within the certificate.

[0004] Digital calibration certificates leverage the machine-readable advantage of XML format to establish easily readable and usable digital calibration information for key measuring equipment / digital pressure sensors in the digital manufacturing and production process. By combining machine learning, deep learning, and other methods, they can quickly and effectively realize the comprehensive application of equipment metrological calibration data, accelerate the deep integration of metrology and measurement technologies, and ultimately achieve a bottom-up reconstruction of the data assurance system in the process of digital transformation. Summary of the Invention

[0005] The purpose of this invention is to provide an online correction method and system for digital pressure sensors based on digital calibration certificates. This method fully leverages the machine-readable advantage of digital calibration certificates, combines calibration data with the digital pressure sensor measurement process, and achieves online correction of digital pressure sensor measurement data. This ensures the accuracy and reliability of digital pressure sensor measurement results and improves manufacturing efficiency and product quality in the intelligent manufacturing process.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] The online correction method for digital pressure sensors based on digital calibration certificates disclosed in this invention is implemented using an edge processing system and includes the following steps:

[0008] Step 1: The user unit sends the digital pressure sensor used for measurement to a metrology institution for calibration. After completing the calibration, the metrology institution generates a corresponding calibration certificate. The calibration certificate includes a machine-readable digital calibration certificate and a human-readable electronic calibration certificate. The digital calibration certificate is in XML format, and the electronic calibration certificate is in PDF format. Both types of certificates are credible and can be mutually verified.

[0009] 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.

[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 data extraction module of the edge processing system parses the XML-formatted digital calibration certificate to extract the basic information of the digital pressure sensor and the measured and standard values ​​from the measurement data. The basic information of the digital pressure sensor is mainly used for matching the calibration certificate with the actual sensor, while the measurement data is mainly used for constructing the correction model.

[0012] Step 4.1: The basic information of the digital pressure sensor being calibrated is stored in the `item` field under `administrativeData`. The manufacturer of the measuring device is stored in the `manufacturer` field of the digital calibration certificate, the model number is stored in the `model` field, and the serial number is stored in the `identifications` field. The calibration result information of the digital pressure sensor is stored in the `measurementResults` section of the digital calibration certificate. The measured values ​​and standard values ​​for 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 results information in the storage module is preprocessed and modeled using the model building module of the edge processing system. The correction model for the digital pressure sensor includes linear and nonlinear models. The correction model is selected either manually or automatically based on the model fitting error.

[0015] Step 5.1: Perform a matching analysis between the digital calibration certificate dataset D and the edge processing system port dataset M to clarify the unit representation of the pressure values ​​at each port and perform automatic conversion of the pressure units to ensure that the units of the pressure sensor measurements and calibration results are consistent.

[0016] Step 5.2: Model the pressure correction model based on the calibration results information after unit conversion.

[0017] Step 6: Combining the matching results of the digital calibration certificate dataset D and the edge processing system port dataset M, the correction model is automatically matched with the edge processing system. In manual correction mode, the corresponding linear model or second-order model is directly selected for correction; in automatic correction mode, the linear model is compared with the edge processing system. and second-order model To determine the quality of fit of the model, select R0. 2 Values ​​less than the preset criterion are used as correction models. The corrected measurement data is then transmitted to the measurement management system.

[0018] This invention discloses an online correction system for digital pressure sensors based on digital calibration certificates, used to implement the aforementioned online correction method for digital pressure sensors based on digital calibration certificates. The online correction system for digital pressure sensors based on digital calibration certificates is an edge processing system, comprising seven parts: a power supply module, a data acquisition module, a data storage module, a data transmission module, a data extraction module, a model building module, and a data correction module.

[0019] The power supply module is mainly used for power supply, with a power supply voltage of 12V, which is achieved through USB, network port, and separate power supply interface.

[0020] The data acquisition module is connected to the digital pressure sensor at the measurement site and is mainly used to acquire the 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 digital calibration certificates, digital calibration certificate datasets, and edge processing system port datasets downloaded from the measurement management system.

[0022] The data transmission module is mainly used to enable communication between the edge processing system and the measurement management system, as well as the on-site digital pressure sensor, to download the device digital certificate and transmit the digital pressure sensor measurement data and the corrected measurement data.

[0023] The data extraction module is mainly developed by a corresponding data parsing module to extract basic information of digital pressure sensors, such as manufacturer, specifications, and serial number, from calibration certificates in XML format. In addition, it also extracts calibration result information from digital calibration certificates, specifically including measured values ​​and standard values.

[0024] The model building module primarily performs automatic unit conversion on the measured and standard values ​​extracted from the calibration results information in the digital calibration certificate, and constructs a correction model for the pressure measurements based on these two types of data. The constructed model library includes linear and nonlinear models, and model selection includes both automatic and manual selection. Automatic selection is mainly based on R-squared values ​​during the model fitting process. 2 The value is used as the basis.

[0025] The data correction module automatically corrects the 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 primarily used for on-site measurement management, enabling comprehensive management of sensor status information, sensor basic information, and on-site measurement data. The sensor status information includes usage, maintenance, and borrowing status. The sensor basic information includes sensor model and specifications, storage location, and responsible person.

[0027] Beneficial effects:

[0028] 1. The present invention discloses an online correction method and system for digital pressure sensors based on digital calibration certificates. It adopts an automatic conversion method based on digital values. Based on the setting of the units of the digital pressure sensor and the value representation of the digital calibration certificate, it automatically identifies the units of the measurement data and calibration data and performs automatic conversion of the value units to realize the digital representation of the value, thereby improving the accuracy of online correction of digital pressure sensors.

[0029] 2. The online correction method and system for digital pressure sensors based on digital calibration certificates disclosed in this invention adopts an automatic parsing method based on digital calibration certificate data. Combining the advantages of machine-readable digital calibration certificates, it can extract the manufacturer, model, serial number, and calibration results of digital pressure sensors from the digital calibration certificates, providing key data support for the online correction of digital pressure sensors.

[0030] 3. The online correction method and system for digital pressure sensors based on digital calibration certificates disclosed in this invention uses linear and nonlinear models to construct different types of correction methods based on the measured values ​​and standard values ​​in the calibration results information of the digital calibration certificate. It can select models manually or automatically to ensure the accuracy and reliability of the digital pressure sensor measurement results and provide a basis for the correction of digital pressure sensor measurement data.

[0031] 4. The online correction method and system for digital pressure sensors based on digital calibration certificates disclosed in this invention achieves the correlation between the correction model and the measurement results of the digital pressure sensor by automatically matching the digital calibration certificate information set with the edge processing system information set, thereby realizing the automatic correction of the measurement results and improving the manufacturing efficiency and product quality in the process of intelligent manufacturing. Attached Figure Description

[0032] Figure 1 This is a diagram of the edge processing system architecture.

[0033] Figure 2 This is a flowchart of the data processing process in an edge processing system.

[0034] Figure 3 This is a flowchart of an online correction method for digital pressure sensors based on digital calibration certificates. Detailed Implementation

[0035] To better illustrate the purpose and advantages of the present invention, the invention will be further described below in conjunction with the accompanying drawings and examples.

[0036] Example 1:

[0037] The digital pressure sensor online correction system based on digital calibration certificate disclosed in this embodiment is an edge processing system, which includes 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 power other modules of the edge processing system. The power supply voltage is 12V, which can be achieved 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 acquire the 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 digital calibration certificates, digital calibration certificate datasets, and edge processing system port datasets downloaded from the measurement management system.

[0041] The data transmission module is mainly used to enable communication between the edge processing system and the measurement management system, as well as the on-site digital pressure sensor, to download the device digital certificate and transmit the digital pressure sensor measurement data and the corrected measurement data.

[0042] The data extraction module is mainly developed by a corresponding data parsing module to extract basic information of digital pressure sensors, such as manufacturer, specifications, and serial number, from calibration certificates in XML format. In addition, it can also extract calibration result information from digital calibration certificates, specifically including measured values ​​and standard values.

[0043] The model building module primarily performs automatic unit conversion on the measured and standard values ​​extracted from the calibration results information in the digital calibration certificate, and constructs a correction model for the pressure measurements based on these two types of data. The constructed model library includes linear and nonlinear models, and model selection includes both automatic and manual selection. Automatic selection is mainly based on R-squared values ​​during the model fitting process. 2 The value is used as the basis.

[0044] The data correction module automatically corrects the 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 primarily used for managing on-site measurement data within enterprises, enabling comprehensive management of sensor status information, basic sensor information, and on-site measurement data. The sensor status information includes usage, maintenance, and borrowing status. The basic sensor information includes sensor model and specifications, storage location, and responsible personnel.

[0046] The edge processing system communicates with the enterprise measurement and management system and sensor information to realize communication and control of sensors and the measurement and management system.

[0047] like Figure 3 As shown in the figure, the online correction method for digital pressure sensors based on digital calibration certificates 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 a metrology institution for calibration. After completing the calibration, the metrology institution generates a corresponding calibration certificate. The calibration certificate includes a machine-readable digital calibration certificate and a human-readable electronic calibration certificate. The digital calibration certificate is in XML format, and the electronic calibration certificate is in PDF format. Both types of certificates are credible and can be mutually verified.

[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, which can realize batch management of digital calibration certificates and electronic certificates as well as 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 data extraction module of the edge processing system parses the XML-formatted digital calibration certificate to extract the basic information of the digital pressure sensor and the measured and standard values ​​from the measurement data. The basic information of the digital pressure sensor is mainly used for matching the calibration certificate with the actual sensor, while the measurement data is mainly used for constructing the correction model.

[0052] Step 4.1: The basic information of the digital pressure sensor being calibrated 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.

[0053] The calibration results of digital pressure sensors are stored in the measurementResults section of the digital calibration certificate. The measured values ​​and standard values ​​for 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, as shown below:

[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 The manufacturer information for the digital pressure sensor in the i-th digital calibration certificate;

[0058] m oi The model information of the digital pressure sensor in the i-th digital calibration certificate;

[0059] i di This refers to the serial number information of the digital pressure sensor in the i-th digital calibration certificate;

[0060] y mi The measured value of the digital pressure sensor in the i-th digital calibration certificate;

[0061] y si 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, representing them 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 for the digital pressure sensor connected to the i-th port of the edge processing system;

[0066] m ori Model information of the digital pressure sensor connected to the i-th port of the edge processing system;

[0067] i driThe serial number information of the digital pressure sensor connected to the i-th port of the edge processing system;

[0068] p i This refers to the information of the i-th port of the edge processing system.

[0069] e si The unit representation of the pressure value at the i-th port of the edge processing system;

[0070] Step 5: The model building module is mainly used to preprocess and model the calibration results information in the storage module. The correction model for the digital pressure sensor mainly adopts linear and nonlinear models. The selection of the correction model can be set manually or automatically selected based on the model fitting error.

[0071] Step 5.1: Perform a matching analysis between the digital calibration certificate dataset D and the edge processing system port dataset M to clarify the unit representation of the pressure values ​​at each port and perform automatic conversion of the pressure units to ensure that the units of the pressure sensor measurements and calibration results are consistent.

[0072] y fm =ky m

[0073] y fs =ky s

[0074] Where, y fm The converted value of the calibration result measurement, y fs The converted value of the calibration result standard value, y m For the measured values ​​in the calibration results, y s The standard value in the calibration result is denoted by k, which is the unit conversion factor.

[0075] The calibration result information will then be automatically converted.

[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 unit-converted calibration results. The actual value of the digital pressure sensor measurement result should be...

[0078] y = y rm +f(y fmj ,y fsj )

[0079] Where y is the correction value of the digital pressure sensor, y rm For the true value of the digital pressure sensor, y fmj Let y be the measured value of the j-th group of calibration results within the measurement range. fsj f(y) represents the true measured value of the j-th group of calibration results within the measurement range. fmj ,y fsj f(y) is a function representing the correction amount for the measured value. fmj ,y fsj It can be a linear, nonlinear or other model. For the same digital pressure sensor, when enough metrological calibration data has been accumulated, machine learning can also be used to train the calibration data.

[0080] The linear model can take the following form:

[0081] f(y fmj ,y fsj )=a(y fmj -y fsj )+b

[0082] Where 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] Where a, b, and c are model parameters.

[0086] 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.

[0087] If it is in automatic correction mode, compare with the linear model. and second-order model To determine the quality of fit of the model, select R0. 2 Smaller values ​​are used as correction models.

[0088] Furthermore, the corrected measurement data is transmitted to the measurement management system.

[0089] The above detailed description further illustrates the purpose, technical solution, and beneficial effects of the invention. It should be understood that the above description 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 within the scope of protection of the present invention.

Claims

1. A method for online correction of a digital pressure sensor based on a digital calibration certificate, characterized in that, Based on an edge processing system, the implementation includes the following steps: Step 1: The user unit sends the digital pressure sensor used for measurement to a metrology institution for calibration. After completing the calibration of the digital pressure sensor, the metrology institution generates a corresponding calibration certificate. The calibration certificate includes a machine-readable digital calibration certificate and a human-readable electronic calibration certificate. The digital calibration certificate is in XML format, and the electronic calibration certificate is in PDF format. Both 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, which enables 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 digital pressure sensor edge processing system. Step 4: The data extraction module of the edge processing system parses the XML format digital calibration certificate to extract the basic information of the digital pressure sensor and the measured values ​​and standard values ​​from the measurement data. The basic information of the digital pressure sensor is mainly used for matching the calibration certificate with the real sensor, and the measurement data is mainly used for constructing the correction model. Step 5: The calibration result information in the storage module is preprocessed and modeled 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: Combining the matching results of the digital calibration certificate dataset D and the edge processing system port dataset M, the correction model is automatically matched with the edge processing system. In manual correction mode, the corresponding linear model or second-order model is directly selected for correction; in automatic correction mode, the linear model is compared with the edge processing system. and second-order model To determine the quality of fit of the model, select R0. 2 Values ​​less than the preset criterion are used as correction models, and the corrected measurement data is then transmitted to the measurement management system.

2. The online correction method for a digital pressure sensor based on a digital calibration certificate as described in claim 1, characterized in that, Step 4 is implemented as follows: Step 4.1: The basic information of the digital pressure sensor being calibrated 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 results of the digital pressure sensor are stored in the measurementResults section 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 online correction method for a digital pressure sensor based on a digital calibration certificate as described in claim 2, characterized in that, Step 5 is implemented as follows: Step 5.1: Perform a matching analysis between the digital calibration certificate dataset D and the edge processing system port dataset M to clarify the unit representation of the pressure values ​​at each port and perform automatic conversion of the pressure units to ensure that the units of the pressure sensor measurements and calibration results are consistent. Step 5.2: Model the pressure correction model based on the calibration results information after unit conversion.

4. The online correction method for a digital pressure sensor based on a digital calibration certificate as described in claim 3, characterized in that, In step 5, the selection of the correction model is either set manually or automatically based on the model fitting error.

5. An online correction system for a digital pressure sensor based on a digital calibration certificate, used to implement the online correction method for a digital pressure sensor based on a digital calibration certificate as described in claim 1, 2, 3, or 4, characterized in that, The online correction system for digital pressure sensors based on digital calibration certificates is an edge processing system, comprising seven parts: a power supply module, a data acquisition module, a data storage module, a data transmission module, a data extraction module, a model building module, and a data correction module. The power supply module is mainly used to provide power. The data acquisition module is connected to the digital pressure sensor at the measurement site and is mainly used to acquire the 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 digital calibration certificates, digital calibration certificate datasets, and edge processing system port datasets downloaded from the measurement management system. The data transmission module is mainly used to enable communication between the edge processing system and the measurement management system, as well as the on-site digital pressure sensor, to download the device digital certificate and transmit the digital pressure sensor measurement data and the corrected measurement data. The data extraction module is mainly developed by a corresponding data parsing module to extract basic information of the digital pressure sensor from the XML format calibration certificate. In addition, it also extracts calibration result information from the digital calibration certificate, specifically including measured values ​​and standard values. The basic information of the digital pressure sensor includes the manufacturer, specifications, and serial number. The model building module primarily performs automatic unit conversion on the measured and standard values ​​extracted from the calibration results information in the digital calibration certificate, and constructs a correction model for the pressure measurements based on these two types of data. The constructed model library includes linear and nonlinear models, and model selection includes both automatic and manual selection. Automatic selection is mainly based on R-squared values ​​during the model fitting process. 2 The value is used as the basis; The data correction module automatically corrects the 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 online correction system for a digital pressure sensor based on a digital calibration certificate as described in claim 5, characterized in that, The power supply module is powered by 12V, which is achieved through USB, Ethernet port, and a separate power supply interface.

7. The online correction system for a digital pressure sensor based on a digital calibration certificate as described 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 usage, maintenance, and borrowing; the measurement sensor basic information includes sensor model and specifications, storage location, and responsible person.

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