Detection method and detection device for radio frequency line
By using a temperature measuring chip and other circuit components based on RF recognition in the RF line detection device, the damage problem of RF line is detected, and the problem of high cost and low efficiency of traditional methods is solved.
Patent Information
- Application Number
- CN202510257494.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-05
- Publication Date
- 2025-05-06
AI Technical Summary
The prior art is difficult to efficiently detect damage or signal distortion of radio frequency lines in power systems, resulting in the impact of the stability of passive wireless temperature measurement systems. Traditional detection methods require professional equipment and knowledge, and are low in cost and efficiency.
A radio frequency line detection device is provided, including a detection component and a reader and a reader and a write-in. The detection component includes a temperature measuring chip based on radio frequency identification, an impedance matching module, an attenuator and a radio frequency connector. By adjusting the transmit power of the reader and writer, two minimum powers of the detection component detected by the temperature are obtained, and the power difference is calculated to judge the damage of the radio frequency line.
It improves the detection efficiency of RF cables, can quickly determine whether there are problems with RF cables, reduces the cost and time of maintenance and maintenance, and is suitable for applications in power equipment work sites.
Smart Images
Figure CN119936743A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of electrical performance testing, and in particular to a method and device for detecting a radio frequency line. Background Art
[0002] Passive wireless temperature measurement based on RFID is increasingly being used in power systems. RFID sensors are connected to readers through radio frequency lines, and signals are transmitted through radio frequency lines. However, during the installation process, workers often pull, bend, twist, and twist the radio frequency lines multiple times, which often results in cracks in the internal braided shielding layer of the radio frequency cable or cold solder joints. Or the radio frequency line is exposed to high temperature and humidity for a long time, which causes rust inside the radio frequency line. These increase the loss of the radio frequency cable or distort the signal, thus affecting the stability of the entire passive wireless temperature measurement system.
[0003] The traditional RF cable loss test method requires professional equipment such as network analyzers or signal sources and power meters, and requires testers to have relevant RF knowledge, which is not suitable for application at power equipment work sites. Therefore, when the passive wireless temperature measurement system is installed and used, once a problem occurs, professionals are required to troubleshoot the RF line problem based on relevant experience. This greatly increases the cost and efficiency of repair or maintenance. Summary of the invention
[0004] In view of the above technical problems existing in the prior art, the present invention provides a method and a device for detecting a radio frequency line, so as to improve the detection efficiency of the radio frequency line.
[0005] The invention discloses a radio frequency line detection device, comprising a detection component and a reader / writer, wherein two ends of the radio frequency line are detachably mounted on the detection component and the reader / writer respectively; the detection component comprises a temperature measurement chip based on radio frequency identification.
[0006] Preferably, the reader / writer is used to adjust the transmission power and read the temperature fed back by the detection component.
[0007] Preferably, the detection component further includes an impedance matching module, an attenuator and a radio frequency connector.
[0008] The temperature measurement chip is connected to the impedance matching module, the attenuator and the radio frequency connector in sequence.
[0009] Preferably, the impedance matching module includes a first inductor, a second inductor, a first capacitor and a second capacitor;
[0010] The first inductor and the second inductor are connected in sequence, the RF+ port of the temperature measuring chip is connected to one end of the first capacitor and the first inductor; the RF- port of the temperature measuring chip is connected to the other end of the first capacitor;
[0011] One end of the second capacitor is connected to one end of the second inductor, and the other end of the second capacitor is connected to the RF-port of the temperature measurement chip.
[0012] Preferably, the attenuator comprises a first resistor, a second resistor and a third resistor.
[0013] One end of the first resistor is connected to one end of the second inductor, one end of the second resistor and the third resistor are respectively connected to two ends of the first resistor, and the other end is connected to the RF-port of the temperature measurement chip.
[0014] Preferably, the other end of the first resistor is connected to every five pins of the radio frequency connector;
[0015] The RF-port of the temperature measuring chip is connected to the first pin and the second pin of the radio frequency connector respectively.
[0016] Preferably, the detection component further comprises a housing and a circuit board arranged in the housing, and the temperature measurement chip, the impedance matching module and the attenuator are arranged on the circuit board;
[0017] The detection component is arranged in the area to be detected; the reader is connected to the host computer via a data line.
[0018] The radio frequency line detection method of the above detection device comprises the following steps:
[0019] Step S1: Install the detection component to the antenna interface end of the reader;
[0020] Step S2: by adjusting the transmission power of the reader / writer, a first minimum power at which the detection component detects the temperature is obtained;
[0021] Step S3: Install the two ends of the radio frequency line to be tested on the detection component and the reader / writer respectively;
[0022] Step S4: by adjusting the transmission power of the reader / writer, the second lowest power at which the detection component detects the temperature is obtained;
[0023] Step S5: Calculate the power difference according to the first minimum power and the second minimum power; and obtain the detection result of the radio frequency line to be tested according to the power difference and the first threshold.
[0024] Preferably, the power difference is calculated as follows:
[0025] ΔP=P2-P1-S
[0026] Among them, ΔP represents the power difference, P2 represents the second lowest power, P1 represents the first lowest power, and S represents the cable loss.
[0027] Preferably, the cable loss is calculated as follows:
[0028] S=α(f)*L
[0029] Where α(f) is the frequency-dependent loss factor and L is the length of the cable in meters.
[0030] Compared with the prior art, the beneficial effects of the present invention are: first, the detection component is installed on the antenna interface end of the reader / writer to obtain the first minimum power of the temperature detected by the detection component; then the two ends of the RF line to be tested are respectively installed on the detection component and the reader / writer to obtain the second minimum power of the temperature detected by the component, and the power loss of the RF line is estimated by the difference between the two minimum powers. Through the power loss and the first threshold, it can be determined that there is a problem with the RF line, which can improve the detection efficiency of the RF line. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Figure 1 It is a schematic diagram of the installation of the detection device of the radio frequency line;
[0032] Figure 2 It is a schematic diagram of the structure of the detection component;
[0033] Figure 3 It is the circuit schematic diagram of the detection component;
[0034] Figure 4 It is a flow chart of the detection method of the present invention.
[0035] Markings in the figure: 1 power equipment cabinet, 2 detection components,
[0036] 21 housing, 22 circuit board, 23 temperature measuring chip, 24 impedance matching module, 25 attenuator, 26 radio frequency connector, 3 radio frequency line, 4 reader / writer, 5 data line, 6 host computer;
[0037] L1 is the first inductor, L2 is the second inductor, C1 is the first capacitor, C2 is the second capacitor, R1 is the first resistor, R2 is the second resistor, and R3 is the third resistor. DETAILED DESCRIPTION
[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0039] The present invention is further described in detail below in conjunction with the accompanying drawings:
[0040] The present invention provides a radio frequency line detection device, such as Figure 1-Figure 3As shown, it includes a detection component 2 and a reader / writer 4, and the two ends of the radio frequency line 3 are detachably installed on the detection component 3 and the reader / writer 4 respectively; the detection component 2 includes a temperature measurement chip 23 based on radio frequency identification RFID.
[0041] First, install the detection component 2 on the antenna interface end of the reader 4 to obtain the first minimum power P1 of the temperature detected by the detection component; then install the two ends of the RF line to be tested on the detection component 2 and the reader 4 respectively to obtain the second minimum power P2 of the temperature detected by the component. The power loss of the RF line is estimated by the difference between the two minimum powers. Through the power loss and the first threshold, it can be determined that there is a problem with the RF line, which can improve the detection efficiency of the RF line.
[0042] When the power loss exceeds a first threshold, it may be considered that there is a problem with the RF line.
[0043] The reader / writer 4 is used to adjust the transmission power and read the temperature fed back by the detection component 3. The reader / writer 4 is a prior art and can be purchased on the market, and the present invention will not be described in detail.
[0044] like Figure 2 and Figure 3 The detection component 3 also includes an impedance matching module 24, an attenuator 25 and a radio frequency connector 26, and the temperature measurement chip 23 is connected to the impedance matching module 24, the attenuator 25 and the radio frequency connector 26 in sequence.
[0045] The temperature measurement chip 23 is usually highly sensitive, and the power required for operation is much lower than the transmission power of the reader (0dBm-33dBm). Therefore, the attenuator 25 is introduced to reduce the sensitivity of the chip, so that the chip cannot work under the low power of the reader, thereby detecting the lowest power P1 and P2. The impedance matching module 24 is used to balance the impedance bandwidth of the chip, so that the chip has consistent sensitivity at the operating frequency, that is, within the range of 902-928MHz, to avoid test errors caused by the reader when working in frequency hopping.
[0046] More specifically, the impedance matching module 24 includes a first inductor L1, a second inductor L2, a first capacitor C1 and a second capacitor C2; the first inductor and the second inductor are connected in sequence, the RF+ port of the temperature measuring chip is connected to one end of the first capacitor C1 and the first inductor L1; the RF- port of the temperature measuring chip is connected to the other end of the first capacitor C1; one end of the second capacitor C2 is connected to one end of the second inductor L2, and the other end of the second capacitor C2 is connected to the RF- port of the temperature measuring chip.
[0047] The attenuator 25 includes a first resistor R1, a second resistor R2 and a third resistor R3, one end of the first resistor R1 is connected to one end of the second inductor L2, one end of the second resistor R2 and the third resistor R3 are respectively connected to the two ends of the first resistor and the other end is connected to the RF-port of the temperature measurement chip.
[0048] The other end of the first resistor R1 is connected to every five pins of the RF connector 26; the RF-port of the temperature measuring chip 23 is respectively connected to the first pin and the second pin of the RF connector 26. More specifically, the RF connector is SMA, the first pin of which is the inner core conductor of the RF connector, and the second to fifth pins are all outer conductor shielding layers, but the setting of the RF connector is not limited thereto, and can be designed into various types according to business needs.
[0049] The detection component 2 also includes a shell 21 and a circuit board 22 arranged in the shell 21, and the temperature measuring chip 23, the impedance matching module 24 and the attenuator 25 are arranged on the circuit board 22; the detection component 2 is arranged in the area to be measured, such as in the power equipment cabinet 1, for detecting the temperature in the area to be measured; the reader 4 is connected to the host computer 6 through the data line 5, and the reader can be controlled by the host computer 6, and the relevant data can be read and calculated.
[0050] The present invention also provides a radio frequency line detection method based on the above detection device, such as Figure 4 As shown, the following steps are included:
[0051] Step S1: Install the detection component 2 to the antenna interface end of the reader / writer 4.
[0052] Step S2: by adjusting the transmission power of the reader / writer 4, the first minimum power P1 (dBm) at which the detection component detects the temperature is obtained.
[0053] Step S3: Install the two ends of the radio frequency line to be tested on the detection component 2 and the reader / writer 4 respectively.
[0054] Step S4: by adjusting the transmission power of the reader / writer 4, the second minimum power P2 at which the detection component detects the temperature is obtained.
[0055] Step S5: Calculate the power difference according to the first minimum power and the second minimum power; and obtain the detection result of the radio frequency line to be tested according to the power difference and the first threshold.
[0056] The power difference is calculated as:
[0057] ΔP=P2-P1-S
[0058] Wherein, ΔP represents the power difference, P2 represents the second lowest power, P1 represents the first lowest power, and S represents the cable loss in dB.
[0059] The cable loss is calculated as:
[0060] S=α(f)*L
[0061] Where α(f) is the frequency-dependent loss factor and L is the length of the cable in meters.
[0062] Generally, RF cables have an insertion loss IL in the access system, which is usually very small, less than 0.5dB. The insertion loss IL can be set as the first threshold, and ΔP is compared with IL. If ΔP is greater than IL, the RF cable may be damaged, and the staff can also evaluate whether the RF cable needs to be replaced based on the size of ΔP.
[0063] If ΔP is less than or equal to IL, and the reader reads the temperature data of the temperature measuring chip and the temperature data is correct, the problem of signal distortion caused by the cable can be ruled out.
[0064] The present invention can help workers determine whether the radio frequency line is working properly after construction, and can also help quickly eliminate cable problems when the RFID passive wireless temperature measurement system fails, and provide reference values to facilitate the investigation of problems with other components other than the radio frequency line.
[0065] The invention has a simple structure and is easy to construct and detect, can greatly improve the detection efficiency of radio frequency lines, and is convenient for troubleshooting RFID-based temperature measurement systems.
[0066] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A radio frequency line detection device, characterized in that: It comprises a detection component (2) and a reader / writer (4), wherein two ends of a radio frequency line (3) are detachably mounted on the detection component (3) and the reader / writer (4) respectively; The detection component (2) comprises a temperature measurement chip (23) based on radio frequency identification.
2. The detection device according to claim 1, characterized in that: The reader / writer (4) is used to adjust the transmission power and read the temperature fed back by the detection component (3).
3. The detection device according to claim 1, characterized in that: The detection component (3) further comprises an impedance matching module (24), an attenuator (25) and a radio frequency connector (26). The temperature measurement chip (23) is connected to the impedance matching module (24), the attenuator (25) and the radio frequency connector (26) in sequence.
4. The detection device according to claim 3, characterized in that: The impedance matching module (24) comprises a first inductor (L1), a second inductor (L2), a first capacitor (C1) and a second capacitor (C2); The first inductor (L1) and the second inductor (L2) are connected in sequence, the RF+ port of the temperature measuring chip (23) is connected to one end of the first capacitor (C1) and the first inductor (L1); the RF- port of the temperature measuring chip (23) is connected to the other end of the first capacitor (C1); One end of the second capacitor (C2) is connected to one end of the second inductor (L2), and the other end of the second capacitor (C2) is connected to the RF-port of the temperature measurement chip (23).
5. The detection device according to claim 4, characterized in that: The attenuator (25) comprises a first resistor (R1), a second resistor (R2) and a third resistor (R3), One end of the first resistor (R1) is connected to one end of the second inductor (L2), one end of the second resistor (R2) and the third resistor (R3) are respectively connected to two ends of the first resistor (R1) and the other end is connected to the RF-port of the temperature measurement chip.
6. The detection device according to claim 5, characterized in that: The other end of the first resistor (R1) is connected to every five pins of the radio frequency connector (26); The RF-port of the temperature measuring chip (23) is respectively connected to the first pin and the second pin of the radio frequency connector (26).
7. The detection device according to claim 3, characterized in that: The detection component (2) further comprises a housing (21) and a circuit board (22) arranged in the housing (21); the temperature measurement chip (23), the impedance matching module (24) and the attenuator (25) are arranged on the circuit board (22); The detection component (2) is arranged in the area to be detected; The reader / writer (4) is connected to a host computer (6) via a data line (5).
8. A method for detecting radio frequency lines by using the detection device according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1: Install the detection component to the antenna interface end of the reader; Step S2: by adjusting the transmission power of the reader / writer, a first minimum power at which the detection component detects the temperature is obtained; Step S3: Install the two ends of the radio frequency line to be tested on the detection component and the reader / writer respectively; Step S4: by adjusting the transmission power of the reader / writer, the second lowest power at which the detection component detects the temperature is obtained; Step S5: Calculate the power difference according to the first minimum power and the second minimum power; and obtain the detection result of the radio frequency line to be tested according to the power difference and the first threshold.
9. The detection method according to claim 8, characterized in that: The power difference is calculated as: ΔP=P2-P1-S Among them, ΔP represents the power difference, P2 represents the second lowest power, P1 represents the first lowest power, and S represents the cable loss.
10. The detection method according to claim 9, characterized in that: The cable loss is calculated as: S=α(f)*L Where α(f) is the frequency-dependent loss factor and L is the length of the cable.