CN107016426B - Pressure sensor module and pressure sensor based on passive RFID technique - Google Patents
Pressure sensor module and pressure sensor based on passive RFID technique Download PDFInfo
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- CN107016426B CN107016426B CN201710436239.7A CN201710436239A CN107016426B CN 107016426 B CN107016426 B CN 107016426B CN 201710436239 A CN201710436239 A CN 201710436239A CN 107016426 B CN107016426 B CN 107016426B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
- G06K17/0029—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device the arrangement being specially adapted for wireless interrogation of grouped or bundled articles tagged with wireless record carriers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/14—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/0775—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card arrangements for connecting the integrated circuit to the antenna
- G06K19/07756—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card arrangements for connecting the integrated circuit to the antenna the connection being non-galvanic, e.g. capacitive
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention relates to a pressure sensor module and a pressure sensor based on a passive RFID technology, comprising: a metal polar plate, a plurality of telescopic brackets and an electronic tag; the metal polar plate is connected with the electronic tag through the telescopic bracket; the electronic tag is used for receiving the energy signal sent by the radio frequency identification RFID reader-writer, generating a feedback signal according to the position relation between the metal polar plate and the electronic tag after receiving the energy signal, and sending the feedback signal to the RFID reader-writer. According to the pressure sensor module based on the passive RFID technology, the transmission of the remote signals can be realized by using the RFID technology, and the transmission distance between the pressure sensor module and the reader-writer is increased.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a pressure sensor module and a pressure sensor based on a passive RFID technology.
Background
Currently, pressure sensors are widely used in a variety of applications, such as: sealing environments such as human body interior, food package and the like, high-temperature and high-pressure environments, high-speed aircrafts and the like.
In the existing pressure sensor, pressure change is generally converted into capacitance change by using a pressure-sensitive capacitor, and then energy transmission of an inductance-capacitance resonant circuit is read to realize the function of pressure sensing. For example, LC passive wireless pressure sensors are the most prominent category of passive sensors. LC passive wireless pressure sensors are typically LC resonant circuits consisting of a pressure sensitive capacitor and an inductor, which acts as an inductive element in the LC circuit and also performs the wireless output of the pressure signal. When pressure changes, the capacitance changes, thereby affecting the resonant frequency of the LC circuit and transmitting the signal out by inductive coupling.
However, based on this, the inventors of the present invention found that the method of transmitting signals by inductive coupling in the prior art has a short transmission distance, resulting in a limitation in the range of use of the pressure sensor.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
Technical problem
In view of the above, the present invention is to provide a pressure sensor module and a pressure sensor based on passive RFID technology, so as to solve the problem of short transmission distance of the existing pressure sensing method.
Solution scheme
To solve the above technical problem, a first aspect of the present invention provides a pressure sensor module based on passive RFID technology, including: a metal polar plate, a plurality of telescopic brackets and an electronic tag; the metal polar plate is connected with the electronic tag through the telescopic bracket; the electronic tag is used for receiving the energy signal sent by the radio frequency identification RFID reader-writer, generating a feedback signal according to the position relation between the metal polar plate and the electronic tag after receiving the energy signal, and sending the feedback signal to the RFID reader-writer.
In one possible implementation, the electronic tag includes a tag antenna, a tag chip, and a base plate; the tag antenna is connected with the tag chip, and the tag antenna and the tag chip are respectively arranged on the bottom plate; the metal polar plate is connected with the bottom plate through the telescopic bracket, and the metal polar plate is arranged in parallel with the tag antenna; the tag antenna is used for receiving the energy signal sent by the RFID reader-writer and sending the energy signal to the tag chip; the tag antenna is further used for calculating the input impedance of the tag antenna according to the position relation between the metal polar plate and the tag antenna after the tag chip receives the energy signal; and after the tag chip receives the energy signal, carrying out self-adaptive adjustment according to the input impedance of the tag antenna to obtain the input impedance of the tag chip, and taking the input impedance of the tag chip as the feedback signal.
In one possible implementation, sending the feedback signal to the RFID reader comprises: the tag chip sends the feedback signal to the tag antenna; and the tag antenna sends the feedback signal to the RFID reader-writer.
In one possible implementation, the tag chip includes a capacitor array, and the adaptively adjusting includes: the tag chip adjusts the capacitor array to enable the input impedance of the tag chip to be in conjugate match with the input impedance of the tag antenna.
In one possible implementation, the bottom plate is a metal plate.
In one possible implementation manner, the number of the telescopic brackets is two, and the telescopic brackets are respectively arranged at two ends of the bottom plate.
In one possible implementation, the telescopic range of the telescopic bracket is 10-80 mm.
In one possible implementation, the tag antenna is a dipole antenna.
In order to solve the technical problems, a second aspect of the present invention provides a pressure sensor based on a passive RFID technology, which includes the pressure sensor module and an RFID reader; the RFID reader is used for generating an energy signal and sending the energy signal to the pressure sensor module, and the energy signal is used for supplying power to the pressure sensor module; the RFID reader-writer is also used for determining a pressure value according to the received feedback signal sent by the pressure sensor module.
Advantageous effects
According to the pressure sensor module and the pressure sensor based on the passive RFID technology, the metal polar plate is connected with the electronic tag through the telescopic bracket, the electronic tag is used for receiving an energy signal sent by the RFID reader-writer, and after the energy signal is received, a feedback signal is generated according to the position relation between the metal polar plate and the electronic tag, and the feedback signal is sent to the RFID reader-writer. According to the pressure sensor module based on the passive RFID technology, the transmission of the remote signals can be realized by using the RFID technology, and the transmission distance between the pressure sensor module and the reader-writer is increased.
Other features and aspects of the present invention will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features and aspects of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic structural diagram of a pressure sensor module based on a passive RFID technology according to a first embodiment of the present invention;
fig. 2 shows a schematic structural diagram of a pressure sensor module based on a passive RFID technology according to a second embodiment of the present invention;
FIG. 3 is a graph of the distance between a metal plate and a tag antenna as a function of the input impedance of the tag antenna;
fig. 4 shows a schematic structural diagram of a pressure sensor based on a passive RFID technology according to a third embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the invention is not limited to the specific embodiments.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.
The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
In addition, numerous specific details are set forth in the following description in order to provide a better illustration of the invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some instances, well known methods, procedures, and components have not been described in detail so as not to obscure the present invention.
Example 1
Fig. 1 shows a schematic structural diagram of a pressure sensor module 2 based on a passive RFID technology according to an embodiment of the present invention, as shown in fig. 1, in this embodiment, the pressure sensor module 2 includes: metal pole plate 22, a plurality of telescopic supports 23 and electronic tags 21.
The metal polar plate 22 is connected with the electronic tag 21 through the telescopic bracket 23.
The electronic tag 21 is configured to receive an energy signal sent by a radio frequency identification (r.f. Radio Frequency Identification, abbreviated as RFID) reader, and after receiving the energy signal, generate a feedback signal according to a positional relationship between the metal plate 22 and the electronic tag 21, and send the feedback signal to the RFID reader.
The electronic tag 21 is an electronic tag 21 with adaptive impedance adjustment. The number of the telescopic brackets 23 is plural, so long as the metal plate 22 and the electronic tag 21 can be connected, and the moving distance between the metal plate 22 and the electronic tag 21 can be limited. The telescopic support 23 may be a spring.
Specifically, the energy signal sent by the RFID reader is used to power the electronic tag 21, the electronic tag 21 obtains electric energy by receiving the energy signal, and a feedback signal is generated according to the distance between the metal polar plate 22 and the electronic tag 21.
The pressure sensor module 2 based on the passive RFID technology provided in the embodiment of the present invention is connected to the electronic tag 21 through the metal polar plate 22 by the telescopic bracket 23, the electronic tag 21 is configured to receive an energy signal sent by an RFID reader, and after receiving the energy signal, generate a feedback signal according to a positional relationship between the metal polar plate 22 and the electronic tag 21, and send the feedback signal to the RFID reader. According to the pressure sensor module 2 based on the passive RFID technology, the transmission of long-distance signals can be realized by using the RFID technology, and the transmission distance between the pressure sensor module 2 and a reader-writer is increased.
Example two
The present embodiment further defines the structure of the electronic tag on the basis of the first embodiment. Fig. 2 shows a schematic structural diagram of a pressure sensor module 2 based on a passive RFID technology according to a second embodiment of the present invention, as shown in fig. 2, in this embodiment, an electronic tag 21 includes a tag antenna 212, a tag chip 211, and a bottom plate 213.
The tag antenna 212 and the tag chip 211 are respectively disposed on the bottom plate 213, and the tag antenna 212 is connected to the tag chip 211; the metal plate 22 is connected to the bottom plate 213 through the telescopic bracket 23, and the metal plate 22 is disposed parallel to the tag antenna 212.
Wherein the bottom plate 213 may be a plate type structure of plastic plate or metal plate or other materials. When the bottom plate 213 is metal, the use effect of the pressure sensor module 2 is better.
In one possible implementation, the number of the telescopic supports 23 is two, and the telescopic supports are respectively arranged at two ends of the bottom plate, and the telescopic range is 10-80 mm.
The tag antenna 212 may be a dipole antenna. The tag antenna 212 is configured to receive an energy signal sent by the RFID reader, and send the energy signal to the tag chip 211.
The tag antenna 212 is further configured to calculate an input impedance of the tag antenna 212 according to a positional relationship between the metal plate 22 and the tag antenna 212 after the tag chip 211 receives the energy signal.
Wherein, the metal plate 22 compresses the telescopic bracket 23 to displace downward after being pressed, and the distance between the metal plate and the tag antenna 212 becomes smaller. The metal plate 22 may be equivalently end-loaded with respect to the tag antenna 212, i.e., with a capacitor in series with the input impedance of the tag antenna 212. A change in the relative distance between the metal plate 22 and the tag antenna 212 will change the magnitude of the loading and change the input impedance of the tag antenna 212.
Specifically, the input impedance of the tag antenna 212 may be calculated by the following steps.
Fig. 3 is a functional relationship between the distance between the metal plate and the tag antenna and the input impedance of the tag antenna, and as shown in fig. 3, there is a one-to-one correspondence between the distance between the metal plate 22 and the tag antenna 212 and the input impedance of the tag antenna 212. Where the abscissa is the distance h between the metal plate 22 and the tag antenna 212 and the ordinate is the tag antenna 212 input impedance.
Wherein, the distance between the metal plate 22 and the tag antenna 212 is h, and C is the input impedance (negative value) of the tag antenna 212, and the functional relationship is shown in formula one.
The first formula is:
C(pF)＝0.015h(mm)-3.409 (1)
in one possible implementation, the tag chip 211 includes a capacitive array that can be adaptively tuned by: the tag chip 211 adjusts the capacitive array such that the input impedance of the tag chip 211 is conjugate matched to the input impedance of the tag antenna 212. Further, an input capacitive impedance of the tag chip 211 is obtained, and the input impedance is used as the feedback signal.
Specifically, the tag chip 211 performs adaptive adjustment according to the input impedance of the tag antenna 212 after receiving the energy signal. The input impedance of the tag antenna 212 may be calculated according to the first formula, and the input impedance of the tag chip 211 that is conjugate-matched with the input impedance of the tag antenna 212 may be calculated. After the input impedance of the tag chip 211 is obtained, the input impedance of the tag chip 211 is used as the feedback signal.
In this embodiment, sending the feedback signal to the RFID reader includes: the tag chip 211 transmits the feedback signal to the tag antenna 212; the tag antenna 212 transmits the feedback signal to the RFID reader. Thus, the RFID reader may obtain the input capacitive impedance of the passive RFID tag chip 211 by obtaining the capacitance value of the capacitive array, that is, the input capacitive impedance of the tag chip 211.
In this embodiment, the working procedure of the pressure sensor module 2 is that when external pressure or deformation of an object acts on the metal plate 22, the distance between the metal plate and the tag antenna 212 or the bottom plate 213 is changed, so that the impedance of the tag antenna 212 is changed accordingly. To satisfy the impedance matching with the tag antenna 212, the impedance-adaptive passive RFID tag chip 211 automatically adjusts its input capacitive impedance, and transmits the adjusted input capacitive impedance data to the RFID reader through the tag antenna 212. The metal plate 22 has a one-to-one correspondence with the input impedance of the tag antenna 212, and the impedance-adaptive passive RFID tag chip 211 will automatically adjust its input capacitive impedance, that is, there is a one-to-one correspondence between the pressure or deformation acting on the metal plate 22 and the input capacitive impedance of the passive RFID tag chip 211. The RFID reader-writer acquires the input capacitive impedance data of the passive RFID tag chip 211 in real time at a prescribed operating frequency through the UHF RFID antenna, and directly reflects the pressure or deformation condition acting on the metal plate in terms of value, thereby completing the wireless pressure detection sensing function of the present invention.
Thus, the pressure sensor module 2 based on the passive RFID technology provided by the embodiment of the present invention includes the tag antenna 212, the tag chip 211 and the bottom plate 213 through the electronic tag 21. The tag antenna 212 and the tag chip 211 are respectively disposed on the bottom plate 213, and the tag antenna 212 is connected to the tag chip 211; the metal plate 22 is connected to the bottom plate 213 through the telescopic bracket 23, and the metal plate 22 is disposed parallel to the tag antenna 212. According to the pressure sensor module 2 based on the passive RFID technology, the RFID technology is used for realizing the transmission of remote signals, the transmission distance between the pressure sensor module 2 and the reader-writer is increased, and the pressure born by the metal polar plate is correspondingly changed to the input capacitive impedance of the tag chip, so that the pressure sensing function is realized.
Example III
Fig. 4 shows a schematic structural diagram of a pressure sensor based on passive RFID technology according to a third embodiment of the present invention, and as shown in fig. 4, the pressure sensor includes a pressure sensor module 2 and an RFID reader 1 described in the first embodiment or the second embodiment.
The RFID reader 1 is configured to generate an energy signal for powering the pressure sensor module 2 and to transmit the energy signal to the pressure sensor module 2.
The RFID reader 1 is further configured to determine a pressure value according to the received feedback signal sent by the pressure sensor module 2.
The RFID reader-writer of the embodiment is a UHF RFID reader-writer, and a UHF RFID antenna is provided. The RFID reader-writer realizes communication with the pressure sensor module 2 through a UHF RFID antenna, and the working frequency of the UHF RFID reader-writer and the pressure sensor module 2 is 840MHz-960MHz.
Specifically, since the metal plate 22 of the pressure sensor module 2 has a one-to-one correspondence with the tag antenna 212 and the input capacitive impedance of the passive RFID tag chip 212, that is, there is a one-to-one correspondence between the pressure or deformation acting on the metal plate 22 and the input capacitive impedance of the passive RFID tag chip 212. The RFID reader-writer acquires the input capacitive impedance data of the passive RFID tag chip 211 in real time at a prescribed operating frequency through the UHF RFID antenna, and directly reflects the pressure or deformation condition acting on the metal plate in terms of value, thereby completing the wireless pressure detection sensing function of the present invention.
The pressure sensor based on the passive RFID technology provided by the embodiment of the invention is used for generating an energy signal through the RFID reader-writer 1 and sending the energy signal to the pressure sensor module 2, wherein the energy signal is used for supplying power to the pressure sensor module 2. The RFID reader-writer 1 is further used for determining a pressure value according to the received feedback signal sent by the pressure sensor module 2, long-distance signal transmission between the RFID reader-writer 1 and the pressure sensor module 2 can be achieved by using an RFID technology, the transmission distance between the pressure sensor module 2 and the RFID reader-writer 1 is increased, and the pressure born by the metal polar plate is correspondingly changed as the input capacitive impedance of the tag chip, so that the pressure sensing function is achieved.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
Claims (7)
1. A pressure sensor module based on passive RFID technology, comprising: a metal polar plate, a plurality of telescopic brackets and an electronic tag;
the metal polar plate is connected with the electronic tag through the telescopic bracket;
the electronic tag is used for receiving an energy signal sent by the radio frequency identification RFID reader-writer, generating a feedback signal according to the position relation between the metal polar plate and the electronic tag after receiving the energy signal, and sending the feedback signal to the RFID reader-writer;
the electronic tag comprises a tag antenna, a tag chip and a bottom plate;
the tag antenna is connected with the tag chip, and the tag antenna and the tag chip are respectively arranged on the bottom plate; the metal polar plate is connected with the bottom plate through the telescopic bracket, and the metal polar plate is arranged in parallel with the tag antenna;
the tag antenna is used for receiving an energy signal sent by the RFID reader-writer and sending the energy signal to the tag chip;
the tag antenna is further used for calculating the input impedance of the tag antenna according to the position relation between the metal polar plate and the tag antenna after the tag chip receives the energy signal;
after receiving the energy signal, the tag chip performs self-adaptive adjustment according to the input impedance of the tag antenna to obtain the input impedance of the tag chip, and takes the input impedance of the tag chip as the feedback signal;
wherein the tag antenna is a dipole antenna.
2. The pressure sensor module of claim 1, wherein transmitting the feedback signal to the RFID reader comprises:
the tag chip sends the feedback signal to the tag antenna;
and the tag antenna sends the feedback signal to the RFID reader-writer.
3. The pressure sensor module of claim 1, wherein the tag chip comprises a capacitive array, the adaptively adjusting comprising:
the tag chip adjusts the capacitor array to enable the input impedance of the tag chip to be in conjugate match with the input impedance of the tag antenna.
4. The pressure sensor module of claim 1, wherein the base plate is a metal plate.
5. The pressure sensor module of claim 1 or 4, wherein the number of the telescopic brackets is two, and the telescopic brackets are respectively arranged at two ends of the bottom plate.
6. The pressure sensor module of claim 5, wherein the telescoping range of the telescoping support is 10-80 mm.
7. A pressure sensor based on passive RFID technology, comprising the pressure sensor module of any one of claims 1-6 and an RFID reader;
the RFID reader is used for generating an energy signal and sending the energy signal to the pressure sensor module, and the energy signal is used for supplying power to the pressure sensor module;
the RFID reader is also used for determining a pressure value according to the received feedback signal sent by the pressure sensor module;
the electronic tag comprises a tag antenna, a tag chip and a bottom plate;
the tag antenna is connected with the tag chip, and the tag antenna and the tag chip are respectively arranged on the bottom plate; the metal polar plate is connected with the bottom plate through the telescopic bracket, and the metal polar plate is arranged in parallel with the tag antenna;
the tag antenna is used for receiving an energy signal sent by the RFID reader-writer and sending the energy signal to the tag chip;
the tag antenna is further used for calculating the input impedance of the tag antenna according to the position relation between the metal polar plate and the tag antenna after the tag chip receives the energy signal;
after receiving the energy signal, the tag chip performs self-adaptive adjustment according to the input impedance of the tag antenna to obtain the input impedance of the tag chip, and takes the input impedance of the tag chip as the feedback signal;
wherein the tag antenna is a dipole antenna.
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| CN201710436239.7A CN107016426B (en) | 2017-06-12 | 2017-06-12 | Pressure sensor module and pressure sensor based on passive RFID technique |
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| CN201710436239.7A CN107016426B (en) | 2017-06-12 | 2017-06-12 | Pressure sensor module and pressure sensor based on passive RFID technique |
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| WO2020034067A1 (en) * | 2018-08-13 | 2020-02-20 | 深圳市大疆创新科技有限公司 | Agricultural unmanned aerial vehicle and water tank thereof |
| CN113226933A (en) * | 2020-08-27 | 2021-08-06 | 深圳市大疆创新科技有限公司 | Unmanned vehicles suit, unmanned vehicles and storage device |
| CN112966531B (en) * | 2021-04-23 | 2023-08-08 | 广东德匠医疗用品有限公司 | Intelligent identification's air wave pressure treatment device |
| CN114414112A (en) * | 2021-12-26 | 2022-04-29 | 苏州大学 | Flexible pressure sensor based on passive RFID tag antenna and detection method |
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| CN102750570A (en) * | 2012-06-01 | 2012-10-24 | 北京物资学院 | Radio frequency identification device (RFID) label with stress sensitive device, RFID system and stress detection method |
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| CN206833476U (en) * | 2017-06-12 | 2018-01-02 | 北京智芯微电子科技有限公司 | A kind of pressure sensor module and pressure sensor based on passive RFID technology |
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| WO2010058868A1 (en) * | 2008-11-19 | 2010-05-27 | Techno Semichem Co., Ltd. | Rfid tag antenna and rfid tag |
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|---|---|---|---|---|
| CN102750570A (en) * | 2012-06-01 | 2012-10-24 | 北京物资学院 | Radio frequency identification device (RFID) label with stress sensitive device, RFID system and stress detection method |
| CN206193874U (en) * | 2016-09-09 | 2017-05-24 | 南通艾菲迪物联网科技有限公司 | Adjustable impedance sensing high frequency RFID module based on pressure -sensitive module of machinery |
| CN206833476U (en) * | 2017-06-12 | 2018-01-02 | 北京智芯微电子科技有限公司 | A kind of pressure sensor module and pressure sensor based on passive RFID technology |
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