A digital calibration certificate-based device usability intelligent management method and system

Abstract

A method and system for intelligent management of equipment availability based on digital calibration certificates, belonging to the field of metrology and testing technology. The system includes a digital calibration certificate server, a digital calibration certificate authentication module, an intelligent gateway, and a host computer. By uploading the digital calibration certificate of the measuring equipment to the digital calibration certificate server, and after authentication, the host computer accesses the digital calibration certificate to obtain basic equipment information, certificate release date, and calibration results. Combined with the association information between the intelligent gateway port stored on the server and the equipment usage requirements, the management of measuring equipment values ​​and product quality management are highly integrated in time and space. The system determines the availability of equipment and disables or restricts data transmission from measuring equipment that does not meet management requirements, restricts the measuring equipment's access to the measurement network, and issues alarms for corresponding measuring equipment faults via the host computer.

Description

Technical Field

[0001] The present invention relates to a method and system for intelligent management of device availability based on digital calibration certificates, belonging to the technical field of metrological testing. Background Art

[0002] With the continuous upgrading and transformation of traditional manufacturing industries, in order to ensure product quality, the number of measuring devices supporting processing and manufacturing production lines has increased sharply, reaching the ten-thousand level or even the hundred-thousand level. These measuring devices cover different types of parameters such as geometric quantities, thermal quantities, mechanical quantities, and electrical quantities. Measuring devices of the same type purchased by an enterprise in different batches or even the same batch may involve different brands and models. From a management perspective, device certificates of different types often belong to different departments, restricting the flow of different types of data such as device metrological data, management data, and measurement data in the civil aircraft quality management system. Moreover, most existing device certificates exist in paper form. Although some certificates have been digitized, they are still limited to small-scale archiving. Even due to insufficient data storage and transmission means, some data information or even all data information is missing, presenting a situation of "data islands", restricting the monitoring of the status of measuring devices, the traceability of product quality, and the comprehensive efficiency analysis of production lines.

[0003] Certificates in XML format have been promoted and applied in digital calibration certificates due to their advantage of being machine-readable. By constructing digital certificates based on XML format, constructing a new device quality assurance method with digital certificates as the carrier, constructing a "digital resume" for the entire life cycle of measuring devices, realizing the empowerment of unstructured data clusters of measuring devices, and achieving the improvement of enterprise management quality and efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a method and system for intelligent management of device availability based on digital calibration certificates, giving full play to the advantage of machine-readability of data calibration certificates, achieving a high degree of integration in time and space between the management of the measured values of measuring devices and the management of product quality, and realizing the circulation of credible measurement results in the digital world through the combination of software and hardware isolation, which is helpful for the management of product quality.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] A method for intelligent management of device availability based on digital calibration certificates disclosed by the present invention includes the following steps:

[0007] Step 1: The user unit sends the equipment used for measurement or testing to a metrology institution for calibration and obtains a 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.

[0008] Step 2: The user unit uploads the obtained digital calibration certificate and electronic calibration certificate to the digital calibration certificate server via a host computer. The digital calibration certificate and electronic calibration certificate are then stored locally on the server. Batch management of digital calibration certificates and electronic certificates is achieved through the host computer.

[0009] Step 3: Authenticate the digital calibration certificates of each measuring device through the server side of the digital calibration certificate. The digital calibration certificate contains a digital signature used for certificate verification. By authenticating the digital signature, the validity of the digital calibration certificate is ensured.

[0010] Step 4: The host computer accesses the digital calibration certificate server, reads the digital calibration certificate from Step 3, and extracts the measurement equipment information, the release date of the digital calibration certificate, and the calibration result information from the digital calibration certificate to obtain the measurement equipment information in the device digital certificate.

[0011] The information of the measurement device being calibrated in step 4 is stored in the item under administrativeData. The manufacturer of the measurement device is stored in the manufacturer field of the digital calibration certificate, the model of the measurement device is stored in the model field of the digital calibration certificate, and the serial number of the measurement device is stored in the identifications field of the digital calibration certificate.

[0012] The issuance date of the digital calibration certificate is stored in coreData under administrativeData, and the certificate issuance date is stored in issueDate. The certificate issuance date is combined with the calibration cycle of the measuring equipment to determine whether the measuring equipment has exceeded the calibration cycle.

[0013] The calibration results of the measuring equipment are stored in the measurementResults section of the digital calibration certificate, and can be retrieved by querying the results field. Measurement uncertainty is obtained through the uncertaintyValue field.

[0014] Step 5: Based on the measurement equipment information, digital calibration certificate release date, and calibration result information extracted in Step 4, the specific information is associated with the measurement equipment by using the communication function of the smart gateway with different types of equipment. This information serves as the basis for determining whether the measurement equipment can access the measurement network and carry out measurement activities.

[0015] Step 5.1: Bind each port of the smart gateway to the manufacturer, model, specifications, and other information of the device. The specific association information is stored in the host computer. Combined with the measurement device information, the release date of the digital calibration certificate, and the calibration result information extracted in Step 4, the association between the digital calibration certificate and the measurement device is realized.

[0016] Step 5.2, the time t of the smart gateway g Digital calibration certificate server s Keep time synchronized with real time t r Maintain consistency. For the date t of the digital calibration certificate issuance for a particular measuring device... ii and the corresponding calibration period Δt i In other words, if t r ≤t ii +△t i If t r >t ii +△t i The measuring device has exceeded its calibration period.

[0017] Step 5.3: The host computer reads the maximum permissible error δ of a certain measuring device. i The measurement uncertainty u is read from the device's digital calibration certificate. i Perform a comparison; if u i >δ i This indicates that the measurement accuracy of the measuring equipment no longer meets the measurement requirements. If u i ≤δ i Extract the error information θ of each measuring point from the calibration result information of the digital calibration certificate. ik If θ is within the full range of the measuring equipment ik ≤δ i This indicates that the measurement accuracy of the measuring equipment meets the measurement requirements. If the measuring equipment has a range of θ for some measuring points across its entire range... ik >δ i This indicates that the measurement results within a certain range of the measuring equipment are unusable.

[0018] Step 6: If the measuring equipment has exceeded the validity period of the calibration certificate, or if the measuring equipment is within the validity period of the calibration certificate but the measurement uncertainty of the calibration result exceeds the maximum permissible error of the measuring equipment, then the measuring equipment is deemed to be disabled.

[0019] If the measuring equipment is within the validity period of its calibration certificate, the measurement uncertainty of the calibration result is less than or equal to the maximum permissible error of the measuring equipment, and the error of some measuring points is greater than the maximum permissible error, then the equipment is restricted from use.

[0020] If the measuring equipment is within the validity period of the calibration certificate, the measurement uncertainty of the calibration result is less than or equal to the maximum permissible error of the measuring equipment, and the error at each measuring point is less than the maximum permissible error, then the equipment is qualified for use.

[0021] Step 7: If the host computer determines that the measuring device is disabled, the smart gateway will disconnect the data transmission between the measuring device and the host computer of the measuring system, restricting the measuring device from accessing the measuring network. Simultaneously, an alarm will be triggered via the host computer to remind the operator that the measuring device does not meet the measurement requirements.

[0022] If the host computer determines that the measuring device is restricted, the smart gateway will restrict the use of the measuring device within the restricted area. Measurement results within this area cannot be transmitted to the host computer, and an alarm will be triggered by the host computer.

[0023] If the host computer determines that the measuring equipment is qualified, the measuring equipment can be normally connected to the host computer of the inspection, testing or experimental system.

[0024] This invention discloses an intelligent device availability management system based on digital calibration certificates, used to implement the aforementioned intelligent device availability management method based on digital calibration certificates. The intelligent device availability management system based on digital calibration certificates includes a digital calibration certificate server, a digital calibration certificate authentication module, an intelligent gateway, and a host computer.

[0025] The digital calibration certificate server is mainly used to support the basic functions of digital calibration certificates, including importing, storing, opening, and authenticating digital certificates.

[0026] The digital calibration certificate authentication module is mainly used to authenticate digital calibration certificates and determine the authenticity of the digital calibration certificate itself.

[0027] The intelligent gateway is primarily used for the transmission and control of measurement data, and for reading key information from digital calibration certificates. The intelligent gateway connects to the measurement equipment via BNC and Ethernet interfaces. Each channel is associated with the brand, model, and serial number of the measurement equipment, and this information is stored on a host computer. The intelligent gateway connects to the host computer providing the digital calibration certificate, and the host computer can intelligently control the gateway's access.

[0028] The host computer is mainly used to extract key information fields from the digital calibration certificate of the measuring equipment, match the digital calibration certificate with the measuring equipment, authenticate the digital calibration certificate, and implement the basic functions of the digital calibration certificate. The basic functions of the digital calibration certificate include storage, opening, reading, deleting, and viewing.

[0029] Beneficial effects:

[0030] 1. The present invention discloses an intelligent management method and system for device availability based on digital calibration certificates. Based on the machine-readable advantage of digital calibration certificates, it realizes the automatic extraction of basic device information, certificate issuance information and calibration result information from XML format certificates, solving the shortcomings of traditional paper certificates and electronic certificates that require manual extraction of key information, and greatly improving work efficiency.

[0031] 2. The present invention discloses an intelligent management method and system for device availability based on digital calibration certificates. It adopts an automatic association method between digital calibration certificates and measurement device channels. By reading the basic information of the device in the digital calibration certificate, it automatically matches the device with the predefined channels in the intelligent gateway, thereby reducing manual costs.

[0032] 3. The present invention discloses an intelligent management method and system for device availability based on digital calibration certificates. It adopts a method for determining the access of measurement devices. By combining whether the performance degradation of the measurement device meets the measurement requirements within the calibration cycle and integrating prior information with the information contained in the digital carrier, it determines whether the device meets the conditions for connecting to the measurement network.

[0033] 4. The present invention discloses an intelligent management method and system for device availability based on digital calibration certificates. It constructs a judgment criterion for disabling measurement devices. Through intelligent management of measurement device access, if any judgment condition is not met, the intelligent gateway will disable or restrict the data transmission function between the measurement device and the host computer of the measurement system, and issue an alarm reminder to the user. Attached Figure Description

[0034] Figure 1 This is a flowchart of an intelligent device availability management method based on digital calibration certificates disclosed in this invention;

[0035] Figure 2 The criteria for determining the appropriate use of equipment. Detailed Implementation

[0036] 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.

[0037] Example 1:

[0038] This embodiment discloses an intelligent management system for device availability based on digital calibration certificates, including a digital calibration certificate server, a certificate authentication module, an intelligent gateway, a measurement device, and a measurement host computer.

[0039] The digital calibration certificate server is mainly used to realize the batch management of device digital calibration certificates, and realize the functions of batch importing, downloading, deleting and viewing digital calibration certificates through the host computer.

[0040] The certificate authentication module is mainly used to authenticate digital calibration certificates and determine the authenticity of the digital calibration certificates themselves.

[0041] The intelligent gateway is primarily used for functions such as transmission and control of measurement data, and reading key information from digital calibration certificates. The intelligent gateway connects to the measurement equipment via various interfaces such as BNC and Ethernet ports. Each channel is associated with the brand, model, and serial number of the measurement equipment, and this information is stored locally on the intelligent gateway.

[0042] The smart gateway is connected to the device management server to enable access to the device's digital calibration certificate.

[0043] The intelligent gateway is connected to the measurement host computer to transmit measurement data during product inspection, testing, or experimentation. The host computer then performs comprehensive analysis and processing of the measurement data.

[0044] The measuring equipment is mainly used for measuring key physical quantities in product inspection, testing, or experimental processes. It can convert geometric, mechanical, and thermal parameters into electrical signals.

[0045] The aforementioned host computer is mainly used to realize the functions of data acquisition, processing and comprehensive analysis of measurement data from the measuring equipment.

[0046] This embodiment discloses a device availability intelligent management method based on digital calibration certificates, and the specific implementation steps are as follows:

[0047] Step 1: The user unit sends the equipment used for measurement or testing to a metrology institution for calibration and obtains a 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.

[0048] Step 2: The user unit uploads the obtained digital calibration certificate and electronic calibration certificate to the digital calibration certificate server via a host computer. The digital calibration certificate and electronic calibration certificate are then stored locally on the server. Batch management of digital calibration certificates and electronic certificates is achieved through the host computer.

[0049] Step 3: Authenticate the digital calibration certificates of each measuring device through the server side of the digital calibration certificate. The digital calibration certificate contains a digital signature used for certificate verification. By authenticating the digital signature, the validity of the digital calibration certificate is ensured.

[0050] Step 4: The host computer accesses the digital calibration certificate server, reads the digital calibration certificate from Step 3, and extracts the measurement equipment information, the release date of the digital calibration certificate, and the calibration result information from the digital calibration certificate to obtain the measurement equipment information in the device digital certificate.

[0051] The information of the measurement device being calibrated in step 4 is stored in the item under administrativeData. The manufacturer of the measurement device is stored in the manufacturer field of the digital calibration certificate, the model of the measurement device is stored in the model field of the digital calibration certificate, and the serial number of the measurement device is stored in the identifications field of the digital calibration certificate.

[0052] The issuance date of the digital calibration certificate is stored in coreData under administrativeData, and the certificate issuance date is stored in issueDate. The certificate issuance date is combined with the calibration cycle of the measuring equipment to determine whether the measuring equipment has exceeded the calibration cycle.

[0053] The calibration results of the measuring equipment are stored in the measurementResults section of the digital calibration certificate, and can be retrieved by querying the results field. Measurement uncertainty is obtained through the uncertaintyValue field.

[0054] Step 5: Based on the measurement equipment information, digital calibration certificate release date, and calibration result information extracted in Step 4, the specific information is associated with the measurement equipment by using the communication function of the smart gateway with different types of equipment. This information serves as the basis for determining whether the measurement equipment can access the measurement network and carry out measurement activities.

[0055] Step 5.1: Bind each port of the smart gateway to the manufacturer, model, specifications, and other information of the device. The specific association information is stored in the host computer. Combined with the measurement device information, the release date of the digital calibration certificate, and the calibration result information extracted in Step 4, the association between the digital calibration certificate and the measurement device is realized.

[0056] Step 5.2, the time t of the smart gateway g Digital calibration certificate server s Keep time synchronized with real time t rMaintain consistency. For the date t of the digital calibration certificate issuance for a particular measuring device... ii and the corresponding calibration period Δt i In other words, if t r ≤t ii +△t i If t r >t ii +△t i The measuring device has exceeded its calibration period.

[0057] Step 5.3: The host computer reads the maximum permissible error δ of a certain measuring device. i The measurement uncertainty u is read from the device's digital calibration certificate. i Perform a comparison; if u i >δ i This indicates that the measurement accuracy of the measuring equipment no longer meets the measurement requirements. If u i ≤δ i Extract the error information θ of each measuring point from the calibration result information of the digital calibration certificate. ik If θ is within the full range of the measuring equipment ik ≤δ i This indicates that the measurement accuracy of the measuring equipment meets the measurement requirements. If the measuring equipment has a range of θ for some measuring points across its entire range... ik >δ i This indicates that the measurement results within a certain range of the measuring equipment are unusable.

[0058] Step 6: If the measuring equipment has exceeded the validity period of the calibration certificate, or if the measuring equipment is within the validity period of the calibration certificate but the measurement uncertainty of the calibration result exceeds the maximum permissible error of the measuring equipment, then the measuring equipment is deemed to be disabled.

[0059] If the measuring equipment is within the validity period of its calibration certificate, the measurement uncertainty of the calibration result is less than or equal to the maximum permissible error of the measuring equipment, and the error of some measuring points is greater than the maximum permissible error, then the equipment is restricted from use.

[0060] If the measuring equipment is within the validity period of the calibration certificate, the measurement uncertainty of the calibration result is less than or equal to the maximum permissible error of the measuring equipment, and the error at each measuring point is less than the maximum permissible error, then the equipment is qualified for use.

[0061] Step 7: If the host computer determines that the measuring device is disabled, the smart gateway will disconnect the data transmission between the measuring device and the host computer of the measuring system, restricting the measuring device from accessing the measuring network. Simultaneously, an alarm will be triggered via the host computer to remind the operator that the measuring device does not meet the measurement requirements.

[0062] If the host computer determines that the measuring device is restricted, the smart gateway will restrict the use of the measuring device within the restricted area. Measurement results within this area cannot be transmitted to the host computer, and an alarm will be triggered by the host computer.

[0063] If the host computer determines that the measuring equipment is qualified, the measuring equipment can be normally connected to the host computer of the inspection, testing or experimental system.

[0064] Example 2:

[0065] This embodiment discloses an intelligent management system for device availability based on digital calibration certificates, which mainly consists of a digital calibration certificate server, a digital calibration certificate authentication module, an intelligent gateway, and a digital calibration certificate host computer.

[0066] The digital calibration certificate server is mainly used to support the basic functions of digital calibration certificates, such as importing, storing, opening, and authenticating digital certificates.

[0067] The digital calibration certificate authentication module is mainly used to authenticate digital calibration certificates and determine the authenticity of the digital calibration certificate itself.

[0068] The intelligent gateway is primarily used for the transmission and control of measurement data, and for reading key information from digital calibration certificates. The intelligent gateway connects to the measurement equipment via BNC and Ethernet interfaces. Each channel is associated with the brand, model, and serial number of the measurement equipment, and this information is stored on a host computer. The intelligent gateway connects to the host computer providing the digital calibration certificate, and the host computer can intelligently control the gateway's access.

[0069] The host computer is mainly used to extract key information fields of the digital calibration certificate of the measuring equipment, match the digital calibration certificate with the measuring equipment, authenticate the digital calibration certificate, and implement the basic functions of the digital calibration certificate (storage, opening, reading, deleting, viewing, etc.).

[0070] This embodiment discloses a device availability intelligent management method based on digital calibration certificates, and the specific implementation steps are as follows:

[0071] Step 1: The user unit sends the equipment used for measurement or testing to a metrology institution for calibration and obtains a calibration certificate for the measuring equipment. 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. The digital calibration certificate primarily provides key data elements for intelligent judgment by the host computer, breaking down the data silos problem that arises in the application of traditional electronic and paper certificates. Both types of certificates are credible and can be mutually verified.

[0072] Step 2: The user unit uploads the obtained digital calibration certificate and electronic calibration certificate to the digital calibration certificate server via a host computer. The digital and electronic calibration certificates are then stored locally on the server. Batch management of the digital and electronic calibration certificates can be achieved through the host computer, mainly including batch deletion, saving, and retrieving of different types of certificates. Neither type of certificate supports editing.

[0073] Step 3: Authenticate the digital calibration certificates of each measuring device through the server side of the digital calibration certificate. The digital calibration certificate contains a digital signature used for certificate verification. By authenticating the digital signature, the validity of the digital calibration certificate is ensured.

[0074] When authenticating a digital calibration certificate using a digital signature, the operator decrypts the digital signature using the metrology institution's public key to obtain a digital digest. The original data is then processed using the same hash algorithm as the sender to generate a new digital digest. The decrypted digest is then compared with the newly generated digest. If they match, it indicates that the original data was not tampered with during transmission and indeed originated from the sender; if they differ, it suggests that the data may have been tampered with or the signature may be invalid.

[0075] If the digital calibration certificate can be authenticated by digital signature, it can be used for subsequent reading operations by the host computer. If the digital calibration certificate cannot be authenticated by signature, it means that the device may have been tampered with during transmission. The certificate to be used needs to be isolated, and the operator should be reminded to further verify the validity of the digital calibration certificate.

[0076] Step 4: The host computer accesses the digital calibration certificate server, queries the digital calibration certificate stored on the server, and extracts the device information, time information, and calibration result information from the digital calibration.

[0077] Furthermore, since the digital calibration certificate adopts a tree structure, the information of the device being calibrated is stored in the item under the administrative data. The manufacturer of the measuring device is stored in the manufacturer field of the digital calibration certificate, the model of the device is stored in the model field of the digital calibration certificate, and the serial number of the device is stored in the identifications field of the digital calibration certificate.

[0078] Furthermore, the time information includes the date the measuring equipment was received, the calibration date, and the certificate issuance date. This time information is stored in `coreData` under `administrativeData`, with the certificate issuance date stored in `issueDate`. The certificate issuance date is combined with the measuring equipment's calibration cycle to determine whether the measuring equipment has exceeded its calibration cycle.

[0079] Furthermore, the calibration results of the measuring equipment are stored in the measurementResults section of the digital calibration certificate, and can be retrieved by querying the results field. The measurement uncertainty can be obtained through the uncertaintyValue field.

[0080] The extracted information is then stored in the form of data pairs, as shown below:

[0081] {(m a1 ,m o1 i d1 i s1 ,m e1 ,u1),(m a2 ,m o2 i d2 i s2 ,m e2 ,u2),…,(m ai ,m oi i di i si ,m ei ,u i ),…,(m an ,m on i dn i sn ,m en ,u n )}

[0082] Where, m ai This contains the manufacturer information for the i-th measuring device, and the data type is string.

[0083] m oi This contains the model information of the i-th measuring device, and the data type is string.

[0084] i di This contains the serial number information of the i-th measuring device, and the data type is string.

[0085] i si The date of issuance of the calibration certificate for the i-th measuring device; the data type is string.

[0086] m ei The calibration result for the i-th measuring device is in data pair format (m i ,m s ), m i and m s These are the measured values ​​and standard values ​​during the calibration process, respectively.

[0087] u iThis represents the uncertainty information for the i-th measuring device, and the data type is numerical.

[0088] Step 5: Based on the measurement equipment information, digital calibration certificate release date, and calibration result information extracted in Step 4, the specific information is associated with the measurement equipment by using the communication function of the smart gateway with different types of equipment. This information serves as the basis for determining whether the measurement equipment can access the measurement network and carry out measurement activities.

[0089] 5.1 Each port of the smart gateway is bound to the manufacturer, model, specifications, and other information of the device. The specific association information is stored in the host computer in the form of data pairs.

[0090] {(m ar1 ,m or1 i dr1 ,p r1 ,△t1,δ1),(m ar2 ,m or2 i dr2 ,p r2 ,△t2,δ2),…,(m ari ,m ori i dri ,p ri ,△t i ,δ i ),…,(m arn ,m orn i drn ,p rn ,△t n ,δ n )}

[0091] Where, m ari This contains the manufacturer information of the device connected to the i-th port of the smart gateway; the data type is string.

[0092] m ori This contains the model information of the device connected to the i-th port of the smart gateway; the data type is string.

[0093] i dri This contains the serial number information of the device connected to the i-th port of the smart gateway; the data type is string.

[0094] p ri This contains the port information of the device connected to the i-th port of the smart gateway, and the data type is string.

[0095] △t i The calibration cycle for the device connected to the i-th port of the smart gateway, with a string data type.

[0096] δ iThe maximum permissible error for connecting devices to the i-th port of the smart gateway, with data type string;

[0097] Combining the measurement equipment information, the release date of the digital calibration certificate, and the calibration result information (m) extracted in step 4 from the digital calibration certificate ai ,m oi i di i si ,m ei ,u i Device information (m) connected to each port of the smart gateway ari ,m ori i dri ,p ri ,△t i ,δ i Perform correlation analysis on the above information (m) ai ,m oi i di ) and (m ari ,m ori i dri If they are completely consistent, the information in the digital calibration certificate can be associated with the information of the devices connected to each port of the smart gateway.

[0098] Furthermore, the availability of measuring equipment is mainly judged by three aspects: (1) whether the validity period of the digital calibration certificate is within the calibration cycle; (2) whether the measurement uncertainty of the digital calibration certificate is less than or equal to the maximum permissible error of the equipment; and (3) whether the measurement error of each measuring point of the digital calibration certificate is less than or equal to the maximum permissible error of the equipment.

[0099] 5.2, Time t of the Smart Gateway g Digital calibration certificate server s Keep time synchronized with real time t r Maintain consistency. For the date t of the digital calibration certificate issuance for a particular measuring device... ii and the corresponding calibration period Δt i In other words, if t r ≤t ii +△t i If t r >t ii +△t i The measuring device has exceeded its calibration period.

[0100] 5.3 The host computer reads the maximum permissible error δ of a certain measuring device. i The measurement uncertainty u is read from the device's digital calibration certificate. i Perform a comparison; if u i >δi This indicates that the measurement accuracy of the measuring equipment no longer meets the measurement requirements. If u i ≤δ i Extract the error information θ of each measuring point from the calibration result information of the digital calibration certificate. ik If θ is within the full range of the measuring equipment ik ≤δ i This indicates that the measurement accuracy of the measuring equipment meets the measurement requirements. If the measuring equipment has a range of θ for some measuring points across its entire range... ik >δ i This indicates that the measurement results within a certain range of the measuring equipment are unusable.

[0101] Step 6: If the measuring equipment has exceeded the validity period of the calibration certificate, or if the measuring equipment is within the validity period of the calibration certificate but the measurement uncertainty of the calibration result exceeds the maximum permissible error of the measuring equipment, then the measuring equipment is deemed to be disabled.

[0102] If the measuring equipment is within the validity period of its calibration certificate, the measurement uncertainty of the calibration result is less than or equal to the maximum permissible error of the measuring equipment, and the error of some measuring points is greater than the maximum permissible error, then the equipment is restricted from use.

[0103] If the measuring equipment is within the validity period of the calibration certificate, the measurement uncertainty of the calibration result is less than or equal to the maximum permissible error of the measuring equipment, and the error at each measuring point is less than the maximum permissible error, then the equipment is qualified for use.

[0104] Step 7: If the host computer determines that the measuring device is disabled, the smart gateway will disconnect the data transmission between the measuring device and the host computer of the measuring system, and the measurement results of the measuring device cannot be transmitted to the host computer. Simultaneously, an alarm will be triggered on the host computer, reminding the operator that the measuring device does not meet the measurement requirements and needs to undergo a periodic inspection, recalibration, and metrological confirmation before data transmission can resume.

[0105] If the host computer determines that the measuring device is restricted, the smart gateway will restrict the use of the measuring device within the restricted area. Measurement results within this area cannot be transmitted to the host computer, and an alarm will be triggered by the host computer.

[0106] If the host computer determines that the measuring equipment is ready for use, the measuring equipment can be normally connected to the host computer of the inspection, testing or experimental system.

[0107] 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 intelligent management of device availability based on digital calibration certificates, characterized in that, Includes the following steps: Step 1: The user unit sends the equipment used for measurement or testing to a metrology institution for calibration and obtains a calibration certificate for the equipment; 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 digital calibration certificate server through the host computer. The digital calibration certificate and electronic calibration certificate are stored locally on the server. Batch management of digital calibration certificates and electronic certificates is achieved through a host computer. Step 3: Authenticate the digital calibration certificates of each measuring device through the server of the digital calibration certificate. The digital calibration certificate contains a digital signature used for certificate verification. By authenticating the digital signature, the validity of the digital calibration certificate is ensured. Step 4: The host computer accesses the digital calibration certificate server, reads the digital calibration certificate from Step 3, and extracts the measurement equipment information, the release date of the digital calibration certificate, and the calibration result information from the digital calibration certificate to obtain the measurement equipment information in the device digital certificate. Step 5: Based on the measurement equipment information, digital calibration certificate release date and calibration result information extracted in Step 4, the specific information is associated with the measurement equipment by using the communication function of the smart gateway with different types of equipment, and serves as the basis for judging whether the measurement equipment can access the measurement network and carry out measurement activities. Step 6: If the measuring equipment has exceeded the validity period of the calibration certificate, or if the measuring equipment is within the validity period of the calibration certificate but the measurement uncertainty of the calibration result exceeds the maximum permissible error of the measuring equipment, then the measuring equipment is deemed to be disabled. If the measuring equipment is within the validity period of the calibration certificate, the measurement uncertainty of the calibration result is less than or equal to the maximum permissible error of the measuring equipment, and the error of some measuring points is greater than the maximum permissible error, then the equipment is restricted from use. If the measuring equipment is within the validity period of the calibration certificate, the measurement uncertainty of the calibration result is less than or equal to the maximum permissible error of the measuring equipment, and the error at each measuring point is less than the maximum permissible error, then the equipment is qualified for use. Step 7: If the host computer determines that the measuring device is disabled, the smart gateway will disconnect the data transmission between the measuring device and the host computer of the measuring system, restricting the measuring device from accessing the measuring network; at the same time, the host computer will issue an alarm to remind the operator that the measuring device does not meet the measurement requirements. If the host computer determines that the measuring device is restricted from use, the smart gateway will restrict the use of the measuring device within the restricted area. Measurement results within this area cannot be transmitted to the host computer, and an alarm will be triggered by the host computer. If the host computer determines that the measuring equipment is qualified, the measuring equipment can be normally connected to the host computer of the inspection, testing or experimental system.

2. The intelligent device availability management method based on digital calibration certificates as described in claim 1, characterized in that, The information of the measurement device being calibrated in step 4 is stored in the item under administrativeData. The manufacturer of the measurement device is stored in the manufacturer field of the digital calibration certificate, the model of the measurement device is stored in the model field of the digital calibration certificate, and the serial number of the measurement device is stored in the identifications field of the digital calibration certificate. The issuance date of the digital calibration certificate is stored in coreData under administrativeData, and the certificate issuance date is stored in issueDate. The issuance date of the certificate is combined with the calibration cycle of the measuring equipment to determine whether the measuring equipment has exceeded the calibration cycle. The calibration results of the measuring equipment are stored in the measurementResults section of the digital calibration certificate and can be obtained by querying the results field; the measurement uncertainty is obtained through the uncertaintyValue field.

3. The intelligent device availability management method based on digital calibration certificates as described in claim 2, characterized in that, Step 5 is implemented as follows: Step 5.1: Bind each port of the smart gateway to the manufacturer, model and specifications of the device. The specific association information is stored in the host computer. Combined with the measurement device information, the release date of the digital calibration certificate and the calibration result information extracted in Step 4, the association between the digital calibration certificate and the measurement device is realized. Step 5.2, the time t of the smart gateway g Digital calibration certificate server s Keep time synchronized with real time t r Maintain consistency; for the date t of the digital calibration certificate issuance for a particular measuring device. ii and the corresponding calibration period Δt i If t r ≤t ii +△t i If t r >t ii +△t i The measuring equipment has exceeded its calibration period; Step 5.3: The host computer reads the maximum permissible error δ of a certain measuring device. i The measurement uncertainty u is read from the device's digital calibration certificate. i Perform a comparison; if u i >δ i This indicates that the measurement accuracy of the measuring equipment no longer meets the measurement requirements. If u i ≤δ i Extract the error information θ of each measuring point from the calibration result information of the digital calibration certificate. ik If θ is within the full range of the measuring equipment ik ≤δ i This indicates that the measurement accuracy of the measuring equipment meets the measurement requirements. If the measuring equipment has a range of θ for some measuring points across its entire range... ik >δ i This indicates that the measurement results within a certain range of the measuring equipment are unusable.

4. A device availability intelligent management system based on digital calibration certificates, used to implement the device availability intelligent management method based on digital calibration certificates as described in claim 1, 2, or 3, characterized in that: This includes a digital calibration certificate server, a digital calibration certificate authentication module, a smart gateway, and a host computer; The digital calibration certificate server is mainly used to support the basic functions of digital calibration certificates, including importing, storing, opening, and authenticating digital certificates. The digital calibration certificate authentication module is mainly used to authenticate digital calibration certificates and determine the authenticity of the digital calibration certificate itself. The intelligent gateway is mainly used for the transmission and control of measurement data and the reading of key information of digital calibration certificates. The intelligent gateway is connected to the measurement equipment through different interfaces such as BNC and network port. Each channel is associated with the brand, model and serial number of the measurement equipment, and the relevant information is stored in the host computer. The smart gateway is connected to the host computer of the digital calibration certificate, and the host computer controls the on / off state of the smart gateway through intelligent judgment. The host computer is mainly used to extract key information fields of the digital calibration certificate of the measuring equipment, match the digital calibration certificate with the measuring equipment, authenticate the digital calibration certificate, and realize the basic functions of the digital calibration certificate. The basic functions of the digital calibration certificate include storage, opening, reading, deleting, and viewing.

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