CN111797963A - Impedance type wireless passive sensor - Google Patents
Impedance type wireless passive sensor Download PDFInfo
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- CN111797963A CN111797963A CN202010664230.3A CN202010664230A CN111797963A CN 111797963 A CN111797963 A CN 111797963A CN 202010664230 A CN202010664230 A CN 202010664230A CN 111797963 A CN111797963 A CN 111797963A
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- rfid chip
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- wireless passive
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- 238000001514 detection method Methods 0.000 claims abstract description 26
- 238000012545 processing Methods 0.000 claims abstract description 7
- 230000008859 change Effects 0.000 claims abstract description 5
- 239000000758 substrate Substances 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000013507 mapping Methods 0.000 claims description 3
- 238000009529 body temperature measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000008672 reprogramming Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010897 surface acoustic wave method Methods 0.000 description 1
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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
- G06K19/07773—Antenna details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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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
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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
- G06K19/0772—Physical layout of the record carrier
Abstract
The invention relates to an impedance type wireless passive sensor, and belongs to the technical field of wireless passive sensors. The sensor comprises an improved RFID chip, a sensing head, an antenna and a reader; the improved RFID chip comprises a current detection circuit, a radio frequency front end module, a digital baseband module and a memory module; the current detection circuit comprises a reference voltage source, a low-swing operational amplifier, an oscillator, a frequency divider and a counter, and is used for operating and processing the current change data of the accessed impedance load. The sensor can realize flexible matching combination of the RFID and different impedance type sensitive chips, thereby realizing detection of various external information such as temperature, gas concentration and the like.
Description
Technical Field
The invention belongs to the technical field of wireless passive sensors, and relates to a wireless passive sensor based on a special radio frequency identification chip.
Background
The wireless passive sensor is a novel sensor which is suitable for the technical development trend and the market demand, and has the characteristics of small volume, convenient use, simple maintenance, adaptation to special application scenes and the like, and the wireless passive sensor is widely concerned. The method for realizing wireless passive sensing comprises the following steps: LC oscillating circuit type, surface acoustic wave type, radio frequency tag type, etc. Radio Frequency Identification (RFID) is a non-contact automatic identification technology, and has been widely used in many industries. A typical RFID system includes an antenna, an RFID chip, and a reader/writer, and the tag does not need to be powered by a battery, and is powered by an interrogation signal of the reader/writer through electromagnetic wave coupling, and generates an induced current inside the tag for other circuits inside the tag to use, and performs signal transmission in a reflection manner. Based on the reasons, a temperature-sensitive resistor or a temperature-sensitive diode can be integrated in the RFID chip circuit to realize the RFID temperature measurement label. Such as: the patent application with publication number CN107239816A proposes to realize wireless and passive temperature measurement of a switch cabinet by using an ultrahigh frequency RFID temperature measurement tag technology. Patent application with publication number CN108197689A proposes to use an RFID temperature measurement tag to realize wireless passive detection of device temperature. However, the use of RFID for wireless sensing is still mainly in the field of temperature detection, and the temperature sensitive head is integrated with the chip in a curing manner, so that the flexible configuration capability is lacking.
Therefore, the present invention is directed to a sensor capable of simultaneously detecting various external information such as temperature and gas concentration.
Disclosure of Invention
In view of this, the present invention provides a wireless passive sensor based on an RFID chip, which realizes detection of various external information such as temperature and gas concentration by flexible matching combination of the RFID chip and different impedance-type sensitive chips.
In order to achieve the purpose, the invention provides the following technical scheme:
an impedance type wireless passive sensor comprises a sensing head, an antenna, a reader and an improved RFID chip; one end of the improved RFID chip is connected with the sensing head, and the other end of the improved RFID chip is connected with the antenna.
Further, the improved RFID chip comprises a current detection circuit, a radio frequency front end module, a digital baseband module and a memory module; the current detection circuit is respectively connected with the radio frequency front end module, the digital baseband module and the memory module, and a load interface is reserved to realize the access and detection of the impedance type load.
Furthermore, the current detection circuit comprises a reference voltage source, a low-swing operational amplifier, an oscillator, a frequency divider, a counter and other modules, and is used for operating and processing the current change data of the accessed impedance load. A first output port of the reference voltage source is connected with the counter through a first oscillator; and a second output port of the reference voltage source is connected with the counter sequentially through the resistor, the low-swing operational amplifier, the second oscillator and the frequency divider.
Further, when the reader approaches the sensor, a radio frequency signal is emitted, and the antenna receives radio frequency energy to supply power for the improved RFID chip; the improved RFID chip is electrified to work, drives and detects the current of the sensitive head, converts the detected current signal into a digital code, and then transmits the digital code back to the reader through the antenna to perform mapping conversion and processing on the data to be detected.
Further, the sensing head is an impedance type load and comprises a temperature sensing head or a gas sensing head.
Further, the sensor also includes an antenna substrate on which the improved RFID chip, sensing head and antenna are disposed.
The invention has the beneficial effects that: the invention also designs flexible matching combination of the RFID and different impedance type sensitive chips by adding a current detection circuit, thereby realizing the detection of various external information such as temperature, gas concentration and the like.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of a sensor according to the present invention;
FIG. 2 is a diagram of the improved RFID chip architecture of the present invention;
fig. 3 is a schematic diagram of a current detection circuit of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Referring to fig. 1 to 3, fig. 1 is a preferred wireless passive sensor of the present invention, which includes: the improved RFID chip is characterized in that on the basis of the traditional radio frequency RFID chip, an impedance access detection module is added in an internal circuit of the improved RFID chip, so that the access and detection of impedance type loads can be realized; the gas sensing head is a silicon bare chip or other substrate bare chips, the surface of which is provided with an interdigital electrode structure and is coated with a certain gas sensing film; the antenna substrate can adopt a rigid substrate or a flexible substrate, and is provided with a copper-clad or aluminum-clad radio frequency antenna, an RFID chip bonding pad and a sensitive head bonding pad; the reader is used for reading the sensitive head information by reprogramming a data processing program on the basis of the traditional radio frequency RFID reader.
Fig. 2 is a diagram of an improved RFID chip architecture of the present embodiment, as shown in fig. 2, the RFID chip architecture includes: compared with the traditional RFID chip, the current detection circuit module is added, and an impedance type load can be additionally connected. As shown in fig. 3, the current detection circuit includes a reference voltage source, a low swing operational amplifier, an oscillator, a frequency divider, a counter, and other modules, and can perform operation and processing on the current variation data of the accessed impedance load.
The sensing head can be an impedance type temperature sensing head or an impedance type gas sensing head, and the impedance of the sensing head changes along with the change of the external temperature or the gas concentration. The temperature sensing head can adopt a silicon bare chip or other substrate bare chips with a platinum resistance wire structure on the surface, and the gas sensing head is a silicon bare chip or other substrate bare chip with an interdigital electrode structure on the surface and a certain gas sensitive film coated on the surface. The power consumption of the sensitive head should be lower than 100 nW.
The antenna substrate can adopt a rigid substrate or a flexible substrate, and a copper-clad or aluminum-clad radio frequency antenna is manufactured on the rigid substrate or the flexible substrate. Compared with the traditional RFID antenna, the antenna substrate provided by the invention needs to additionally manufacture the electrode bonding pads according to the number and the layout of the ports of the special RFID chip and the ports of the sensitive head. Through the electrode bonding pads, physical integration and signal interconnection of the radio frequency antenna, the special RFID chip and the sensitive head are realized.
The reader can be used for reading sensitive information such as temperature, gas concentration and the like by reprogramming a data processing program on the basis of the traditional radio frequency RFID reader.
The sensor of the embodiment specifically works as follows:
the reader is close to the sensor within 5m, transmits a radio frequency signal, and the antenna receives radio frequency energy to supply power for the special RFID chip; the special RFID chip is electrified to work, drives and detects the current of the sensing head, converts the detected current signal into a digital code, and then transmits the digital code back to the reader through the antenna to perform mapping conversion and processing of concentration. When the gas sensing head is selected to be connected, the impedance of the sensing head can be changed after the sensing head adsorbs target gas molecules, the current of the sensing head detected by the professional RFID chip can be changed, the reader can display different gas concentration values, and the detection of the gas concentration is realized. In the same way, when the temperature sensitive head is selected to be connected, the temperature detection can be realized.
The sensor converts weak analog signals into digital codes inside the special RFID chip and then carries out wireless transmission, thereby avoiding the distortion of the analog signals in the transmission process and ensuring that the performances of detection precision, sensitivity and the like are not influenced by the change of transmission distance. The same reader can read and write information of a plurality of sensors at the same time. Different sensing heads can be selected and configured according to actual needs, and detection of various environmental parameters is achieved.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (6)
1. A current detection circuit is characterized by comprising a reference voltage source, a low-swing operational amplifier, an oscillator, a frequency divider and a counter, wherein the current detection circuit is used for operating and processing current change data of an accessed impedance load;
the first output port of the reference voltage source is connected with the counter through a first oscillator; and a second output port of the reference voltage source is connected with the counter sequentially through the resistor, the low-swing operational amplifier, the second oscillator and the frequency divider.
2. An improved RFID chip, which comprises a radio frequency front end module, a digital baseband module and a memory module, and is characterized by further comprising a current detection circuit according to claim 1, wherein the current detection circuit is respectively connected with the radio frequency front end module, the digital baseband module and the memory module, and a load interface is reserved, so that the access and detection of an impedance type load are realized.
3. An impedance based wireless passive sensor, comprising a sensing head, an antenna and a reader, and an improved RFID chip as claimed in claim 2; one end of the improved RFID chip is connected with the sensing head, and the other end of the improved RFID chip is connected with the antenna.
4. The impedance type wireless passive sensor according to claim 3, wherein when the reader is close to the sensor, a radio frequency signal is emitted, and an antenna receives radio frequency energy to supply power for the improved RFID chip; the improved RFID chip is electrified to work, drives and detects the current of the sensitive head, converts the detected current signal into a digital code, and then transmits the digital code back to the reader through the antenna to perform mapping conversion and processing on the data to be detected.
5. An impedance-based wireless passive sensor according to claim 3 or 4, wherein the sensing head is an impedance-based load, including a temperature-sensitive head or a gas-sensitive head.
6. An impedance-based wireless passive sensor according to claim 3, further comprising an antenna substrate, the modified RFID chip, the sensing head and the antenna being disposed on the antenna substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010664230.3A CN111797963A (en) | 2020-07-10 | 2020-07-10 | Impedance type wireless passive sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010664230.3A CN111797963A (en) | 2020-07-10 | 2020-07-10 | Impedance type wireless passive sensor |
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| Publication Number | Publication Date |
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| CN111797963A true CN111797963A (en) | 2020-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010664230.3A Pending CN111797963A (en) | 2020-07-10 | 2020-07-10 | Impedance type wireless passive sensor |
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| Country | Link |
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| CN (1) | CN111797963A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113283565A (en) * | 2021-06-02 | 2021-08-20 | 上海宜链物联网有限公司 | RFID tag chip antenna impedance automatic tuning system and method |
| CN113673644A (en) * | 2021-08-20 | 2021-11-19 | 南京邮电大学 | Behavior sensing method and device based on radio frequency identification |
| EP4184125A1 (en) * | 2021-11-23 | 2023-05-24 | Commissariat à l'énergie atomique et aux énergies alternatives | Device for measuring at least one physical variable and associated determination method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102831457A (en) * | 2012-08-24 | 2012-12-19 | 广州中盈物流科讯有限公司 | Passive RFID ((Radio Frequency Identification Device) temperature sensor label |
| CN104281869A (en) * | 2014-10-17 | 2015-01-14 | 奥星制药设备（石家庄）有限公司 | Wireless temperature electronic tag based on radio frequency technology |
| CN106203585A (en) * | 2016-06-28 | 2016-12-07 | 湖北华威科智能技术有限公司 | A kind of RFID of band Temperature Humidity Sensor |
-
2020
- 2020-07-10 CN CN202010664230.3A patent/CN111797963A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102831457A (en) * | 2012-08-24 | 2012-12-19 | 广州中盈物流科讯有限公司 | Passive RFID ((Radio Frequency Identification Device) temperature sensor label |
| CN104281869A (en) * | 2014-10-17 | 2015-01-14 | 奥星制药设备（石家庄）有限公司 | Wireless temperature electronic tag based on radio frequency technology |
| CN106203585A (en) * | 2016-06-28 | 2016-12-07 | 湖北华威科智能技术有限公司 | A kind of RFID of band Temperature Humidity Sensor |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113283565A (en) * | 2021-06-02 | 2021-08-20 | 上海宜链物联网有限公司 | RFID tag chip antenna impedance automatic tuning system and method |
| CN113283565B (en) * | 2021-06-02 | 2024-01-26 | 上海宜链物联网有限公司 | Automatic tuning system and method for antenna impedance of RFID tag chip |
| CN113673644A (en) * | 2021-08-20 | 2021-11-19 | 南京邮电大学 | Behavior sensing method and device based on radio frequency identification |
| EP4184125A1 (en) * | 2021-11-23 | 2023-05-24 | Commissariat à l'énergie atomique et aux énergies alternatives | Device for measuring at least one physical variable and associated determination method |
| FR3129475A1 (en) * | 2021-11-23 | 2023-05-26 | Commissariat à l'énergie atomique et aux énergies alternatives | Device for measuring at least one physical quantity and associated determination method |
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