CN118643850A - RFID sensor tag detection method and system - Google Patents

Abstract

The present application discloses an RFID sensor tag detection method and system, the method includes the following steps: using a preset frequency point and its corresponding ideal sensitivity data to perform a reader/writer calibration; using a reader/writer to perform a power scan of a set frequency band range on the RFID sensor tag to obtain the frequency band where the lowest power is located; using the frequency band where the lowest power is located as the central frequency band of the RFID sensor tag, and when the central frequency band meets the set frequency band threshold, the RFID sensor tag is qualified for detection. The beneficial effects of the present application: using the frequency band where the lowest power is located as the central frequency band of the RFID sensor tag to select the frequency band with the highest sensitivity of the RFID sensor tag, without setting a larger power range to increase coverage, avoiding frequent reading anomalies caused by excessive frequency band offset, and reducing the number of readings to improve detection efficiency while ensuring detection accuracy.

Description

RFID sensor tag detection method and system

Technical Field

The present application relates to the technical field of RFID sensor tag detection, and in particular to an RFID sensor tag detection method and system.

Background Art

The current technology in the RFID field focuses on the ID recognition of objects and does not contain other information about the object being recognized. Under free space conditions, the recognition distance between the reader and the RFID tag is determined by the following formula:

Under the conditions of Pth (the minimum touch threshold power of the RFID chip) and EIRP (gain parameter related to the card reader), the recognition distance R is mainly determined by the gain Gtag and transmission coefficient τ of the tag antenna. Under the conditions of Pth (the minimum touch threshold power of the RFID chip) and EIRP (gain parameter related to the card reader), the recognition distance R is mainly determined by the gain Gtag and transmission coefficient τ of the tag antenna. It can be seen that the greater the tag antenna gain and the greater the transmission coefficient, the longer the recognition distance.

Due to manual errors caused by adjusting the frequency of the cutting surface material during the production process of RFID sensor tags, the chip sensor parameter errors, center frequency offset, and sensor data accuracy vary greatly during batch operations, which affects the decline in the success rate of RFID sensor tags and the reduction in sensor data accuracy.

In the related art, the qualification of RFID sensor tags is judged by the tag reading and writing success rate. The frequency band needs to be set very wide, the power needs to be set slightly higher to increase the coverage, and the center frequency band needs to be blindly typed to increase the number of readings to avoid failure in reading tags, which is inefficient.

The Chinese patent "UHF RFID group tag selection method based on probability matrix model", publication number: CN114580588A, publication date: June 3, 2022, specifically discloses the use of on-site group tag signal sampling, combined with the specific test data of the tag and the specific test data of the reader, and the use of probability matrix to predict the overall probability of tag reading and writing success rate, combined with the channel monitoring characteristics of the site, and finally select the best match among all the candidate tags to achieve the tag selection effect. This scheme uses the probability matrix to predict the overall probability of tag reading and writing success rate, and requires the overall frequency band test to be performed on the tag, which is inefficient.

The Chinese patent "A detection device for multi-dimensional sensing RFID tags", publication number: CN113203905A, publication date: August 3, 2021, specifically discloses that the detection device for multi-dimensional sensing RFID tags includes a server, the output end of the server is connected to a logic judgment module and a mechanical transmission module, the output end of the logic judgment module is connected to a fault test module, the output end of the fault test module is connected to a fault item cleaning module and a mechanical transmission module; the fault test module is used to read data from each RFID tag under test; the mechanical transmission module is used to drive each RFID tag to be tested to move to the position of the fault test module for data reading; the logic judgment module is used to determine whether the fault test module can normally read the data of the RFID tag under test; the fault item cleaning module is used to break the RFID tag determined to be abnormal. This solution also requires the overall frequency band detection of the RFID tag, which is less efficient.

Summary of the invention

In view of the low efficiency of performing full-band threshold matching for RFID sensor tag detection in the prior art, the present application provides an RFID sensor tag detection method and system, which utilizes the frequency band where the lowest power is located as the central frequency band of the RFID sensor tag to select the frequency band with the highest sensitivity of the RFID sensor tag. Since the frequency bands where the lowest power is located meet the set frequency band threshold, it can be determined that the RFID sensor tag can still meet the information transmission requirements at a higher power, and there is no need to set a larger power range to increase the coverage rate, so as to avoid frequent reading anomalies caused by excessive frequency band offset, thereby ensuring the detection accuracy and reducing the number of readings to improve the detection efficiency.

To achieve the above technical objectives, the present application provides a technical solution, which is an RFID sensor tag detection method, comprising the following steps: performing reader/writer calibration using preset frequency points and their corresponding ideal sensitivity data; using the reader/writer to perform a power scan of a set frequency band range on the RFID sensor tag to obtain the frequency band with the lowest power; using the frequency band with the lowest power as the center frequency band of the RFID sensor tag, and the RFID sensor tag is qualified when the center frequency band meets the set frequency band threshold.

Furthermore, the use of the reader to perform a power scan of the RFID sensor tag in a set frequency band includes: adjusting the initial transmission power of the reader according to a preset scanning power starting value; the reader performs a step-by-step power scan of the RFID sensor tag in the set frequency band according to the initial transmission power and the preset power adjustment value.

Furthermore, the obtaining of the frequency band where the lowest power is located includes: obtaining the lowest response power of each frequency band by scanning step by step, and comparing the lowest response power of each frequency band to obtain the frequency band where the lowest power is located.

Furthermore, the reader performs a step-by-step power scan on the RFID sensor tag within the set frequency band according to the initial transmission power and the preset power adjustment value, and also includes: when the RFID sensor tag responds, the reader terminates the step-by-step power scan and records the current power as the lowest response power of the corresponding frequency band.

Furthermore, the reader/writer performs a step-by-step power scan on the RFID sensor tag within a set frequency band according to the initial transmission power and the preset power adjustment value, and also includes: when the preset power threshold is reached, the reader/writer terminates the step-by-step power scan, records all response powers of the corresponding frequency band, and takes the lowest stable power of all response powers as the lowest response power of the corresponding frequency band.

Furthermore, it also includes: obtaining the RFID sensor tag requirement parameters and calling the preset detection items; performing detection on the RFID sensor tag according to the preset detection items, and outputting the project detection results; when the center frequency band meets the set frequency band threshold and the project detection result is qualified, the RFID sensor tag detection is qualified.

Furthermore, the detection of the RFID sensor tag according to the preset detection items at least includes: using a set regular expression to perform EPCID compliance detection and TID compliance detection on the RFID sensor tag; using a reader to read the actual parameters and configuration values of the RFID sensor tag to perform Trimming detection; using the reader to perform sensitivity scanning on the RFID sensor tag according to the preset sensitivity requirements of the frequency band to be detected to perform sensitivity detection; using an image recognition algorithm to perform tag appearance detection on the RFID sensor tag; using a reader to collect sensor data to perform sensor data detection on the RFID sensor tag.

Furthermore, the use of a reader/writer to collect sensor data and perform sensor data detection on an RFID sensor tag also includes: obtaining standard sensor data based on the RFID sensor tag; the reader/writer collects sensor data of the RFID sensor tag; performing weighted averaging on the sensor data of the RFID sensor tag to obtain an average value of the sensor data; calculating whether the difference between the average value of the sensor data and the standard sensor data is within a set range, and if so, determining that the sensor data detection of the RFID sensor tag is qualified, and if not, determining that the sensor data detection of the RFID sensor tag is unqualified.

Furthermore, the weighted averaging of the sensor data of the RFID sensor tags to obtain the sensor data average value includes: performing data preprocessing on the sensor data of the RFID sensor tags, and arranging the sensor data of the RFID sensor tags in order; selecting data from the sensor data of the RFID sensor tags according to a preset number of points and weighting them respectively according to preset weights; and performing average calculation on the weighted data to obtain the sensor data average value.

Another technical solution provided by the present application is an RFID sensor tag detection system, which is used to implement the method as described above, including: a reader/writer, which is used to perform a power scan on the RFID sensor tag according to a set frequency band range; a processing module, which calibrates the reader/writer according to the design file and receives the power scan status of the reader/writer; a linearly polarized antenna 2, which is communicatively connected to the reader/writer and the RFID sensor tag, and is used to transmit detection information.

The beneficial effects of the present application are as follows: the frequency band where the lowest power is located is used as the central frequency band of the RFID sensor tag to realize the selection of the highest sensitivity frequency band of the RFID sensor tag, without setting a larger power range to increase the coverage rate, avoiding frequent reading anomalies caused by excessive frequency band offset, and reducing the number of readings to improve the detection efficiency while ensuring the detection accuracy; considering that the RFID sensor tag has different requirements for the central frequency band in different application scenarios, if the RFID sensor tag does not meet the set frequency band threshold of the current RFID sensor tag type, the RFID sensor tag is matched with the set frequency band threshold of the remaining RFID sensor tag types, so that the unqualified RFID sensor tags under the current RFID sensor tag type are allocated as RFID sensor tag types in the unqualified allocation, which is convenient for the subsequent processing and recycling of unqualified RFID sensor tags, thereby improving the processing efficiency of RFID sensor tags.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flow chart of the RFID sensor tag detection method of the present application.

FIG. 2 is an interactive schematic diagram of the RFID sensor tag detection system of the present application.

FIG. 3 is a front view of the structure of the detection end of the RFID sensor tag detection system of the present application.

FIG. 4 is a structural side view of the detection end of the RFID sensor tag detection system of the present application.

DETAILED DESCRIPTION

In order to make the purpose, technical solutions and advantages of the present application more clear, the present application is further described in detail below in conjunction with the drawings and examples. It should be understood that the specific implementation method described here is only an optimal embodiment of the present application, which is only used to explain the present application and does not limit the scope of protection of the present application. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

As shown in FIG. 1 , as the first embodiment of the present application, the RFID sensor tag detection method includes the following steps:

Perform reader calibration using preset frequency points and their corresponding ideal sensitivity data;

The reader is used to perform a power scan of the set frequency band range on the RFID sensor tag to obtain the frequency band with the lowest power; the frequency band with the lowest power is used as the central frequency band of the RFID sensor tag. When the central frequency band meets the set frequency band threshold, the RFID sensor tag is qualified.

In this embodiment, the frequency band with the lowest power is used as the central frequency band of the RFID sensor tag to realize the selection of the highest sensitivity frequency band of the RFID sensor tag. There is no need to set a larger power range to increase the coverage rate, avoid frequent reading anomalies caused by excessive frequency band offset, and reduce the number of readings to improve detection efficiency while ensuring detection accuracy.

Performing reader calibration using preset frequency points and their corresponding ideal sensitivity data includes:

Extract preset frequency points and their corresponding ideal sensitivity data;

The reader/writer transmits a preset frequency signal based on the preset frequency and its corresponding ideal sensitivity data, and adjusts the sensitivity of the reader/writer with the ideal sensitivity corresponding to the preset frequency to perform reader/writer calibration.

First, the preset frequency point that needs to be calibrated is obtained by using the preset frequency point and its corresponding ideal sensitivity data. The reader sends a signal according to the preset frequency point, so as to adjust the sensitivity of the reader according to the ideal sensitivity corresponding to the preset frequency point, thereby avoiding the influence of the sensitivity difference of the reader on the actual RFID sensor tag detection, and further improving the accuracy of RFID sensor tag detection.

In this embodiment, the set frequency band range can be the same as the preset frequency point range, that is, the set frequency band range is the frequency band range included by the maximum preset frequency point and the minimum preset frequency point. At this time, the reader calibration includes all frequency bands detected by the RFID sensor tag. In other embodiments, the set frequency band range can also be larger than the frequency band range included by the maximum preset frequency point and the minimum preset frequency point, that is, the reader calibration with a larger range improves the detection frequency band range of the reader and improves the detection adaptability range of the reader. In some real-time calibration cases, the preset frequency point can also be randomly selected within the set frequency band range or selected according to a preset interval, that is, some frequency points are selected within the set frequency band range to perform reader calibration, which can reduce the reader calibration time while ensuring the sensitivity of the reader to a certain extent.

Using a reader to perform a power scan of a set frequency band on an RFID sensor tag includes:

Adjust the initial transmission power of the reader according to the preset scanning power starting value;

The reader performs a step-by-step power scan on the RFID sensor tag within a set frequency band according to the initial transmission power and the preset power adjustment value.

The preset scanning power starting value can be set according to the required parameters of the RFID sensor tag, that is, it is set according to the qualified receiving power of the RFID sensor tag. The reader adjusts the transmission power according to the initial transmission power and the preset power adjustment value, thereby performing a step-by-step power scan on each frequency band of the RFID sensor tag within the set frequency band. For example, within a certain frequency band, the reader performs the first power scan on the RFID sensor tag according to the initial transmission power, obtains the response of the RFID sensor tag to the initial transmission power in the current frequency band according to the response of the RFID sensor tag, and continuously adjusts the transmission power according to the preset power adjustment value to obtain the minimum power of the RFID sensor tag response in the frequency band, and records the minimum response power of each frequency band of the RFID sensor tag, thereby comparing the minimum response power of each frequency band, and obtaining the minimum response power in all frequency bands, and taking the frequency band corresponding to the minimum power as the center frequency band. At this time, the frequency band where the minimum power is obtained includes:

The lowest response power of each frequency band is obtained by scanning step by step, and the lowest response power of each frequency band is compared to obtain the frequency band where the lowest power is located.

In order to improve efficiency, the reader performs a step-by-step power scan on the RFID sensor tag within a set frequency band according to the initial transmission power and the preset power adjustment value, and also includes:

When the RFID sensor tag responds, the reader terminates the step-by-step power scan and records the current power as the lowest response power in the corresponding frequency band.

In this case, the reader/writer's step-by-step scanning of the RFID sensor tag in each frequency band is terminated when the RFID sensor tag responds, and the last scanning power in the corresponding frequency band is used as the minimum response power of the corresponding frequency band, thereby eliminating the need for full-power scanning and improving scanning efficiency. It can be understood that in this case, the preset power adjustment value is a positive value, and the initial transmission power is at least less than or equal to the minimum required response power, that is, the reader/writer's transmission power continues to increase during the adjustment process, which can ensure that the power of the RFID sensor tag's first response is the minimum response power.

In other cases, the reader/writer performs a step-by-step power scan on the RFID sensor tag within a set frequency band according to the initial transmission power and the preset power adjustment value, and further includes:

When the preset power threshold is reached, the reader terminates the step-by-step power scan, records all response powers of the corresponding frequency band, and takes the lowest stable power of all response powers as the lowest response power of the corresponding frequency band.

The preset power threshold is the preset scanning power end value, and the preset scanning power start value to the preset scanning power end value is the scanning power range of the reader. For example, when the full power range is 1dBm to 30dBm, a power scan of 1dBm to 30dBm is performed in each frequency band within the set frequency band range to obtain all response powers of each frequency band. When higher accuracy is required, the lowest stable power is selected as the lowest response power of the corresponding frequency band through scanning of the full power range to avoid errors in the selection of the center frequency band of the RFID sensor tag caused by some RFID sensor tags responding to a lower transmission power but failing to achieve a stable response. In this embodiment, the lowest stable power can be the initial power of the stable response, that is, when the preset power adjustment value is a positive value, all powers adjusted after the lowest stable power should be responded to by the RFID sensor tag. Using a reader to perform a power scan of a set frequency band range on an RFID sensor tag includes:

Adjust the initial transmission power of the reader according to the preset scanning power termination value;

The reader performs a step-by-step power scan on the RFID sensor tag within a set frequency band according to the initial transmission power and the preset power adjustment value.

In this case, the preset power adjustment value is a negative value, that is, the reader continuously reduces the transmission power to obtain the response of the RFID sensor tag under different power conditions. At this time, the reader performs a step-by-step power scan on the RFID sensor tag in the set frequency band according to the initial transmission power and the preset power adjustment value, and also includes:

When the RFID sensor tag does not respond, the reader terminates the step-by-step power scan. If there is a previous transmission power, the previous transmission power is recorded as the minimum response power of the corresponding frequency band. If there is no previous transmission power, an alarm is issued.

When the RFID sensor tag does not respond, the previous transmission power is used as the minimum response power of the corresponding frequency band, and the non-response is used as the selection node. The scanning situation of the reader from high power to low power can be obtained. At this time, if the RFID sensor tag fails to respond at the preset scanning power termination value, it can be directly concluded that the RFID sensor tag does not meet the qualified standards and an alarm is issued. In the actual detection of RFID sensor tags, it should be a pipeline detection operation to improve the detection efficiency. At this time, the detection system can be associated with the processing unit, or the reader can be associated with the same processing unit. At this time, if the processing unit receives multiple alarm signals at the same time, a fault warning is issued, so as to facilitate the separation of detection failures and problems caused by RFID sensor tags not meeting the qualified standards during the detection process.

In this embodiment, the frequency band where the lowest power is located is used as the central frequency band of the RFID sensor tag. When the central frequency band meets the set frequency band threshold, the RFID sensor tag is detected to be qualified, and the following further includes:

Get the RFID sensor tag type and set the frequency band threshold according to the RFID sensor tag type.

For different types of RFID sensor tags, the set frequency band thresholds are also different. For example, when the RFID sensor tag is attached to metal, the frequency band needs to be 926MHz, when the RFID sensor tag is attached to the human body, the frequency band needs to be 910MHz, and when the RFID sensor tag is attached to plastic, the frequency band needs to be 880MHz. Therefore, the types of RFID sensor tags include at least metal RFID sensor tags, human RFID sensor tags, and plastic RFID sensor tags, so that the corresponding RFID sensor tags are applied to different application scenarios. The set frequency band thresholds include at least 926MHz, 910MHz, and 880MHz. When the center frequency band meets the set frequency band threshold, the RFID sensor tag is qualified, that is, the center frequency band is at least close to or equal to the preset frequency band threshold, and the proximity value can be set according to the RFID sensor tag requirement parameters.

As a second embodiment of the present application, the RFID sensor tag detection method further includes:

Obtain the required parameters of the RFID sensor tag and call the preset detection items accordingly;

Perform detection on RFID sensor tags according to preset detection items and output the detection results of the items;

When the center frequency band meets the set frequency band threshold and the project test result is qualified, the RFID sensor tag is tested qualified.

The preset test items at least include EPCID compliance test, TID compliance test, Trimming test, sensitivity test, tag appearance test and sensor data test. Testing the RFID sensor tag according to the preset test items at least includes:

Perform EPCID compliance detection and TID compliance detection on RFID sensor tags by setting regular expressions;

Use the reader to read the actual parameters and configuration values of the RFID sensor tag to perform trimming detection;

Using the reader/writer to perform sensitivity scanning on the RFID sensor tag according to the preset sensitivity requirements of the frequency band to be detected to perform sensitivity detection;

Perform tag appearance detection on RFID sensor tags using image recognition algorithms;

The sensor data is collected by the reader/writer to perform sensor data detection on the RFID sensor tag.

In this embodiment, the detection item is adaptively called according to the required parameters of the RFID sensor tag. It can be understood that the center frequency band detection is also a detection item of the RFID sensor tag.

EPCID generally refers to a unique identifier in an RFID sensor tag based on the EPC (Electronic Product Code) standard. EPC is used to uniquely identify goods in the supply chain. EPCID compliance testing mainly verifies the EPC code in the RFID sensor tag to ensure that it complies with the EPCglobal standard. TID (Tag Identifier) is a unique serial number of an RFID sensor tag, which is usually programmed and written by the manufacturer during the tag production process to uniquely identify each RFID sensor tag. TID compliance testing mainly verifies the TID of the RFID sensor tag to confirm its compliance and uniqueness. In this embodiment, a regular expression is set to detect the characteristic marking purpose and chip batch of the RFID sensor tag to achieve EPCID compliance testing and TID compliance testing. Regular expressions use a formalized grammar to describe or match a series of strings that conform to specific grammatical rules. The precise format of the RFID sensor tag identifier can be obtained through the RFID sensor tag type, and the regular expression is called in the pre-stored format to match the identifier of the current RFID sensor tag. If the match is successful, the current RFID sensor tag is considered to have passed the EPCID compliance test and the TID compliance test. If the match fails, the unqualified content is output according to the identifier of the failed match.

In the manufacturing process of RFID sensor tags, Trimming refers to fine-tuning the parameters inside the chip to ensure that its performance meets the predetermined standards. Therefore, in this embodiment, the actual parameters of the RFID sensor tag are read by a reader and compared with the pre-stored configuration values. The pre-stored configuration values are the Trimming data and verification rules that match the type of the RFID sensor tag. When the actual parameters of the RFID sensor tag match the configuration values, the Trimming test is considered qualified. If the actual parameters of the RFID sensor tag do not match the configuration values, the Trimming test is considered unqualified.

When performing RFID sensor tag sensitivity detection, the design file is imported, and the frequency points and their corresponding ideal sensitivity data in the design file are quickly and accurately extracted through the reader/writer, that is, the preset frequency points and their corresponding ideal sensitivity data are used to perform reader/writer calibration. At this time, the reader/writer stores the structured data of the design parameters and can access the data efficiently. Then, the corresponding ideal sensitivity is matched according to the RFID sensor tag type, and the power of the reader/writer is set to the matching point to be detected. The sensitivity is scanned one by one according to the frequency band to be detected, and compared with the sensitivity and detection requirements in the stored structured data. When the sensitivity of the RFID sensor tag matches the ideal sensitivity, the RFID sensor tag sensitivity test is qualified. If the sensitivity of the RFID sensor tag does not match the ideal sensitivity, the RFID sensor tag sensitivity test is unqualified.

By using image recognition algorithms to perform label appearance detection on RFID sensor tags, the EPCID printed on the RFID sensor tag can be identified and matched with the EPCID stored in the RFID sensor tag to determine whether the printed EPCID and the stored EPCID match. It is also possible to detect whether the RFID sensor tag program and hardware match. If the printed EPCID and the stored EPCID match, the label appearance detection is qualified. If the printed EPCID and the stored EPCID do not match, the label appearance detection is unqualified.

In other embodiments, considering that there are requirements for the appearance and shape of the RFID sensor tag, the tag appearance detection also includes:

Obtaining shape parameters of the RFID sensor tag according to the type of the RFID sensor tag;

Collect real-time images of RFID sensor tags, use image recognition algorithms and real-time images to determine whether the RFID sensor tags meet the RFID sensor tag shape parameters, if so, the RFID sensor tag appearance test is qualified, if not, the RFID sensor tag appearance test is unqualified.

Of course, when there is a need to detect wear and damage on RFID sensor tags, it is also possible to use the image recognition algorithm to determine whether the RFID sensor tags in the real-time image have wear and damage, thereby improving the detection accuracy of qualified RFID sensor tags.

Using the reader to collect sensor data and perform sensor data detection on the RFID sensor tag also includes:

Acquire standard sensor data based on RFID sensor tags;

The reader/writer collects sensor data from the RFID sensor tag;

Perform weighted averaging on the sensor data of the RFID sensor tags to obtain the average value of the sensor data;

Calculate whether the difference between the average value of the sensor data and the standard sensor data is within a set range. If so, it is determined that the RFID sensor tag sensor data detection is qualified. If not, it is determined that the RFID sensor tag sensor data detection is unqualified.

The sensor data may include temperature, humidity, light intensity, pressure value, voltage, etc., depending on the type of sensor built into the tag. According to the RFID sensor tag, the type of sensor built into the tag can be obtained, and then the standard sensor data is obtained. The reader collects the sensor data of the RFID sensor tag and performs weighted averaging to obtain the average value of the sensor data. The average value is used to avoid misjudgment caused by a certain error and improve the detection accuracy. In this embodiment, the sensor data of the RFID sensor tag is weighted averaged to obtain the average value of the sensor data, including:

Perform data preprocessing on the sensor data of the RFID sensor tag, and arrange the sensor data of the RFID sensor tag in order; select data from the sensor data of the RFID sensor tag according to a preset number of points and assign weights according to preset weights respectively;

The average value of the sensor data is obtained by performing average calculation on the weighted data.

After arranging in order, select the data with the preset number of points for weighted averaging, which can avoid misjudgment caused by accidental errors in a certain section of data and further improve the detection accuracy. In this embodiment, the sensor data of the RFID sensor tag is arranged in order from small to large, the preset number of points is 1/4, 1/2, 3/4, and the preset weights are 0.8, 1.1, 1.1, that is, take the three point data of 1/4, 1/2, and 3/4 and assign weights of 0.8, 1.1, and 1.1 respectively to calculate the average value of the sensor data. Due to the difference in sensors, it is sufficient that the difference between the average value of the sensor data and the standard sensor data is within the allowable error range, that is, the set range.

As a third embodiment of the present application, the RFID sensor tag detection method further includes:

When the central frequency band does not meet the set frequency band threshold, RFID sensor tag allocation is performed according to the type of RFID sensor tag that matches the central frequency band and meets the set frequency band threshold.

Taking into account that RFID sensor tags have different requirements for center frequency bands in different application scenarios, if the RFID sensor tag does not meet the set frequency band threshold of the current RFID sensor tag type, the RFID sensor tag will be matched with the set frequency band threshold of other RFID sensor tag types, so that the unqualified RFID sensor tags under the current RFID sensor tag type will be allocated as the RFID sensor tag type in the unqualified allocation, which is convenient for the subsequent processing and recycling of unqualified RFID sensor tags and improves the processing efficiency of RFID sensor tags.

As a fourth embodiment of the present application, an RFID sensor tag detection system includes:

A reader/writer, used for performing power scanning on the RFID sensor tag according to a set frequency band range;

The processing module calibrates the reader according to the design file and receives the power scan status of the reader;

The linear polarization antenna 2 is communicatively connected to the reader/writer and the RFID sensor tag to transmit detection information.

In this embodiment, the reader is calibrated by the processing unit. After the calibration is completed, the reader performs power scanning on the RFID sensor tag through the linear polarization antenna 2 to detect the center frequency band.

In an embodiment where a preset detection item needs to be executed, the RFID sensor tag detection system further includes:

The image acquisition module is used to acquire real-time images of FID sensor tags.

At this time, the processing module at least includes a calibration unit, an image processing unit, a rule verification unit and a judgment unit. The calibration unit is used to calibrate the reader/writer according to the design file, the image processing unit is used to identify and process the real-time image collected by the image acquisition module according to the image recognition algorithm, the rule verification unit pre-stores TID, EPCID regular expression verification rules and Trimming verification rules to perform rule verification for the RFID sensor tag, and the judgment unit pre-stores the judgment logic to judge whether the RFID sensor tag is qualified with the output results of the remaining units. The calibration unit and the rule verification unit are communicatively connected to the reader/writer, the image processing unit, the rule verification unit and the reader/writer are communicatively connected to the judgment unit, and the image processing unit is also communicatively connected to the image acquisition module. In this embodiment, the image acquisition module is a camera.

As shown in Figures 3 and 4, the linear polarization antenna 2 is at least arranged above the RFID sensor tag to achieve good information transmission and avoid the uncertainty of the circular polarization antenna. In this embodiment, the RFID sensor tag is placed on the detection table 6, and the linear polarization antenna 2 is arranged on the antenna mounting plate 1. The detection table 6 and the antenna mounting plate 1 are arranged relative to each other to realize that the linear polarization antenna 2 is placed above the RFID sensor tag. The antenna mounting plate 1 is arranged on the lifting bracket 3 through the antenna bracket back plate 4, and the lifting bracket 3 is arranged on the detection table 6. The lifting bracket 3 can adjust the distance between the antenna and the RFID sensor tag to adapt to the signal transmission distance between the linear polarization antenna 2 and the RFID sensor tag under different detection conditions. Furthermore, for the stability of the overall structure, an antenna side panel bracket 5 is provided, the bottom of the antenna side panel bracket 5 is connected to the detection table 6, and the side of the antenna side panel bracket 5 is connected to the lifting bracket 3. At the same time, a column 7 is provided at the bottom of the detection table 6 to raise the height of the detection table 6, thereby reducing the requirements of the detection table 6 on the placement environment and improving the applicability range of the detection. It is understandable that the pillar 7, the antenna mounting plate 1 and the detection plate 6 can be a telescopic structure to expand the scope of application. This embodiment improves the yield rate of RFID sensor tags by detecting various items of RFID sensor tags.

As shown in Figure 2, the processing module also includes a display unit, which displays in real time whether the RFID sensor tag is qualified. In other cases, the display unit is also used to interact with the user, such as displaying preset detection items for the user to choose.

The specific implementation described above is a preferred implementation of the RFID sensor tag detection method and system of the present application, and is not intended to limit the specific implementation scope of the present application. The scope of the present application includes but is not limited to the specific implementation. All equivalent changes made in accordance with the shape and structure of the present application are within the protection scope of the present application.

Claims (10)

1. The RFID sensing label detection method is characterized by comprising the following steps of: the method comprises the following steps:

   performing reader-writer calibration by using preset frequency points and corresponding ideal sensitivity data;

   performing power scanning of a set frequency range on the RFID sensing tag by using a reader-writer to obtain a frequency range where the lowest power is located;

   and taking the frequency band with the lowest power as the central frequency band of the RFID sensing tag, and detecting the RFID sensing tag to be qualified when the central frequency band accords with a set frequency band threshold.
2. 2. The RFID sensing tag detection method of claim 1, wherein:

   the performing power scanning of the set frequency range on the RFID sensing tag by using the reader-writer comprises the following steps:

   Adjusting the initial transmitting power of the reader-writer according to a preset scanning power initial value;

   And the reader-writer performs step-by-step power scanning on the RFID sensing tag in a set frequency band range according to the initial transmitting power and the preset power adjustment value.
3. 3. The RFID sensing tag detection method of claim 2, wherein:

   the frequency band where the lowest power is obtained includes:

   and acquiring the lowest response power of each frequency band by step-by-step scanning, and comparing the lowest response power of each frequency band to obtain the frequency band where the lowest power is located.
4. 4. The RFID sensing tag detection method of claim 2, wherein:

   the step-by-step power scanning of the RFID sensing tag is carried out by the reader-writer according to the initial transmitting power and the preset power adjusting value in the set frequency band range, and the step-by-step power scanning further comprises:

   When the RFID sensing tag responds, the reader-writer terminates the step-by-step power scanning, and records that the current power is the lowest response power of the corresponding frequency band.
5. 5. The RFID sensing tag detection method of claim 2, wherein:

   The step-by-step power scanning of the RFID sensing tag is performed by the reader-writer according to the initial transmitting power and the preset power adjustment value in the set frequency band range, and the step-by-step power scanning further comprises:

   When the preset power threshold is reached, the reader-writer terminates the step-by-step power scanning, records all the response powers of the corresponding frequency bands, and takes the lowest stable power of all the response powers as the lowest response power of the corresponding frequency bands.
6. 6. The RFID sensing tag detection method of claim 1, wherein: further comprises:

   Acquiring a preset detection item corresponding to the RFID sensing tag demand parameter;

   detecting the RFID sensing tag according to a preset detection item, and outputting an item detection result;

   when the central frequency band accords with the set frequency band threshold value and the item detection result is qualified, the RFID sensing tag is detected to be qualified.
7. 7. The RFID sensing tag detection method of claim 6, wherein:

   The performing detection on the RFID sensor tag according to the preset detection item at least includes:

   Performing EPCID compliance detection and TID compliance detection on the RFID sensor tag by using the set regular expression;

   Reading actual parameters and configuration values of the RFID sensing tag by using a reader-writer to execute the Trimming detection;

   Performing sensitivity scanning on the RFID sensing tag by using a reader-writer according to the sensitivity requirement of a preset frequency band to be detected to perform sensitivity detection;

   Performing tag appearance detection on the RFID sensing tag by using an image recognition algorithm;

   And acquiring sensing data by using a reader-writer to perform sensing data detection on the RFID sensing tag.
8. 8. The RFID sensing tag detection method of claim 7, wherein:

   the sensing data detection of the RFID sensing tag by using the reader-writer to collect sensing data further comprises the following steps:

   Acquiring standard sensing data according to the RFID sensing tag;

   the reader-writer acquires sensing data of the RFID sensing tag;

   weighting average is carried out on the sensing data of the RFID sensing tag to obtain a sensing data average value;

   and calculating whether the difference value between the average value of the sensing data and the standard sensing data is in a set range, if so, judging that the sensing data of the RFID sensing tag is qualified, and if not, judging that the sensing data of the RFID sensing tag is unqualified.
9. 9. The RFID sensing tag detection method of claim 8, wherein:

   the step of weighting and averaging the sensing data of the RFID sensing tag to obtain a sensing data average value comprises the following steps:

   Performing data preprocessing on the sensing data of the RFID sensing tags, and arranging the sensing data of the RFID sensing tags in sequence;

   selecting data in the sensing data of the RFID sensing tag according to preset dot digits and weighting according to preset weights respectively;

   And carrying out average value calculation on the weighted data to obtain the average value of the sensing data.
10. An rfid sensor tag detection system for implementing the method of any one of claims 1 to 9, characterized by: comprising the following steps:

    The reader-writer is used for executing power scanning on the RFID sensing tag according to the set frequency band range;

    the processing module is used for calibrating the reader-writer according to the design file and receiving the power scanning condition of the reader-writer;

    and the linear polarization antenna is in communication connection with the reader-writer and the RFID sensing tag and is used for transmitting detection information.