CN107516054B - Radio frequency identification passive wireless resonance sensor structure and system capable of being networked at will - Google Patents
Radio frequency identification passive wireless resonance sensor structure and system capable of being networked at will Download PDFInfo
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- CN107516054B CN107516054B CN201610438735.1A CN201610438735A CN107516054B CN 107516054 B CN107516054 B CN 107516054B CN 201610438735 A CN201610438735 A CN 201610438735A CN 107516054 B CN107516054 B CN 107516054B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10118—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the sensing being preceded by at least one preliminary step
- G06K7/10148—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the sensing being preceded by at least one preliminary step the step consisting of dynamically tuning the resonant circuit of the interrogation device that is emitting the interrogation signal, e.g. for impedance matching inside of the interrogation device
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
- G06K7/10326—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers the antenna being of the very-near field type, e.g. capacitive
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Abstract
The invention provides a radio frequency identification passive wireless resonance sensor structure and a system capable of networking at will, wherein the radio frequency identification passive wireless resonance sensor structure comprises an interrogator and a sensor label; in the inquiry charging period T1, the interrogator transmits a radio frequency inquiry signal, the sensor tag receives the radio frequency inquiry signal transmitted by the interrogator, the energy of the coupling inquiry signal is maximized in the impedance matching state, charging is carried out, and the retroreflection signal is extremely small; in a sensing output period T2, the sensor tag works comprehensively, a modulator in the tag controls a modulation switch to be switched on and off according to the rule of a coded signal, matching and mismatching of matching impedance and antenna impedance are achieved respectively, therefore, the intensity of a reflected signal changes according to the rule and the characteristics of the coded signal, and the interrogator receives a wireless sensing signal. The invention has long query distance and can be queried by wireless addressing.
Description
Technical Field
The invention belongs to the technical field of passive wireless sensors, and particularly relates to a radio frequency identification passive wireless resonance sensor tag and a system.
Background
The passive wireless sensor is particularly suitable for being used in specific occasions where the wiring is inconvenient, the contact cannot be made, and the power supply cannot be replaced. The passive wireless sensor is generally a wireless query sensor using electromagnetic waves, the wireless query sensor is excited to generate a sensing output signal and wirelessly transmits the sensing output signal back to a query end through the electromagnetic waves, and the query end obtains sensor parameter information by analyzing the characteristics of the sensing output signal.
The existing passive wireless sensor is mainly realized by adopting a surface acoustic wave sensor. The sensing query signal (i.e. the excitation signal wirelessly transmitted by the query end to the surface acoustic wave sensor) and the sensing output signal (i.e. the signal returned by the surface acoustic wave sensor to the query end) of the surface acoustic wave sensor have the same frequency in the same frequency band, or the frequency difference is very close. If the wireless addressing function of the saw sensor is to be implemented, the parameters of the individual saw sensors must be differentiated. For example, for the surface acoustic wave resonator, addressing can be realized only by the difference of resonance frequencies, and the resonance frequencies of the sensors are different, so that the required design parameters are different, which not only increases the complexity of the sensing device, but also causes the difference of sensing performance.
The acquisition of the wireless sensing signal of the surface acoustic wave sensor is realized through the following two processes: 1) sensing and inquiring: an inquiry electric wave is emitted by an inquiry end to excite the surface acoustic wave sensor to work, and the surface acoustic wave sensor accumulates certain oscillation energy in the form of mechanical energy; 2) acquiring a sensing signal: at the moment, the query signal is discontinuous, namely the query signal is zero, and the mechanical oscillation signal accumulated by the surface acoustic wave sensor is converted into an electromagnetic wave signal and transmitted back to the query end. The wireless query distance of the existing passive wireless surface acoustic wave sensor is very limited, and the wireless query distance is difficult to greatly improve, and one important reason is that the Q value of the existing surface acoustic wave resonator is only about 2000 at most.
Ultrahigh frequency Radio Frequency Identification (RFID) systems also use electromagnetic wave propagation coupling to achieve contactless information transmission. The reader-writer provides radio frequency energy for the tag, the tag antenna receives the radio frequency energy and sends electronic coding information of the tag to the reader-writer in a backscattering debugging mode, the maximum reading-writing distance is larger than 1m, and the maximum reading-writing distance can reach 3-8 m typically. The data communication rate of the ultrahigh frequency RFID system can reach more than 600kbit/s, thousands of labels can be read at one time, and the ultrahigh frequency RFID system is applied to the fields of traffic control, logistics management, asset management and the like at present. However, the ultrahigh frequency RFID tag cannot be used as a sensor at present because no physical parameter sensitive unit is arranged inside the ultrahigh frequency RFID tag.
Disclosure of Invention
The invention aims to provide a passive resonant sensor tag which is long in query distance and can be queried in a wireless addressing mode and a sensor system.
In order to solve the technical problem, the invention provides a radio frequency identification passive wireless resonance sensor tag capable of being randomly networked, which comprises a sensor end antenna, a radio frequency front end, a power circuit, an oscillating circuit, a sensitive element, an encoder, a memory and a modulator, wherein the sensor end antenna is connected with the radio frequency front end; the oscillating circuit and the sensitive element form an oscillator; the radio frequency front end comprises a matched impedance and a load modulation switch; the load modulation switch controls the matching and the mismatching of the matching impedance and the antenna impedance; the power supply circuit rectifies and stores the coupling signal, and when the energy stored by the power supply circuit exceeds a threshold value, an oscillator, an encoder and a modulator in the sensor tag are triggered to work; the sensitive element senses a parameter to be measured, the sensitive element is used as a part of the oscillating circuit, and the frequency change of the oscillating signal output by the oscillating circuit is caused by the characteristic change caused by the action of the parameter to be measured; the oscillating circuit sends an oscillating signal carrying parameter information to be detected to the encoder as an encoding clock signal; the encoder reads a pre-stored sensor tag address or ID information from the memory, generates a coding signal under the control of a coding clock signal and controls the modulator to work; the coded signal comprises sensor address or ID information and frequency information of the oscillation signal; the modulator controls the modulation switch to be switched off and switched on according to the rule of the coded signals, and matching (switching off) and mismatching (switching on) of matching impedance and antenna impedance are achieved respectively. When the impedance is matched, the energy received by the antenna at the sensor end is coupled maximally, and the wireless signal reflected back to the sensor interrogator end is minimum; when the impedance is mismatched, the energy received by the antenna at the sensor end is very small, and the wireless signal reflected back to the sensor interrogator end is the largest. Thus, the opening and closing of the load modulation switch causes the wireless sensor signal received by the interrogator to have a change of state of strong (1) and weak (0).
Further, the work period comprises an inquiry charging period T1 and a sensing output period T2; the sensor tag receives a radio frequency query signal transmitted by an upstream interrogator in a query charging period T1, and reflects a wireless sensing signal to the upstream interrogator in a sensing output period T2; there is no interval between the inquiry charging period T1 and the sense output period T2.
Furthermore, the power supply circuit consists of a diode voltage multiplying circuit, a rectifying circuit, a storage capacitor and a power supply management circuit; in the inquiry charging period T1, the power supply circuit converts the received radio frequency inquiry signal into direct current electric energy and stores the direct current electric energy into the storage capacitor, and when the voltage at two ends of the storage capacitor reaches a certain value, the power supply circuit is triggered to work and supplies power to the oscillation circuit, the frequency divider, the encoder, the modulator and the memory.
Further, when the load modulation switch is switched off, the impedance of the antenna at the sensor end is matched with the input impedance of the interrogator; when the load modulation switch is closed, the sensor side antenna impedance is mismatched with the interrogator input impedance.
Further, the oscillation circuit is one of a gate oscillation circuit, a pierce oscillation circuit, a miller oscillation circuit, or an RLC oscillation circuit.
Further, the sensor tag further comprises a frequency divider, and an oscillation signal output by the oscillator is used as an encoding clock signal after frequency division.
The invention also provides a sensor system using the sensor tag for networking, which comprises an interrogator and the sensor tag, wherein in an inquiry charging period T1, the interrogator transmits a radio frequency inquiry signal, the sensor tag receives the radio frequency inquiry signal transmitted by the interrogator, the energy of the coupling inquiry signal is maximized in an impedance matching state, charging is carried out, and at the moment, a retroreflection signal is extremely small; in a sensing output period T2, the sensor tag works comprehensively, a modulator in the tag controls a modulation switch to be switched on and off according to the rule of a coded signal, and matching (switching on and off) and mismatching (switching on and off) of matching impedance and antenna impedance are respectively realized, so that the intensity of a reflected signal changes according to the rule and the characteristics of the coded signal, and the interrogator receives a wireless sensing signal.
Furthermore, the interrogator comprises a DSP, a microwave source, an interrogator end antenna, a receiving and transmitting isolator, a receiving channel, an oscillator, a clock and an external interface; the transceiver isolator is used for transceiving isolation of the radio frequency query signal and the wireless sensing signal; the microwave source generates microwave signals under the control of the DSP, and the microwave signals pass through the transmitting isolator and are transmitted out through the interrogator end antenna; the wireless sensing signals are sent to a receiving channel through a transmitting-receiving isolator, the receiving channel is sent to a DSP after filtering, amplifying, detecting, demodulating and decoding, and the DSP obtains ID information with a sensor label and a frequency value of oscillation signals output by an oscillator after information extraction and processing.
Further, the receiving channel includes a filter circuit, an amplifying circuit, a detecting circuit, and a demodulating and decoding circuit.
Compared with the prior art, the invention has the remarkable advantages that:
(1) the passive wireless sensor can be formed by passive resonant sensors with any frequency, namely, the wireless query of any passive resonant sensor is realized. By selecting the passive resonance sensor with a high Q value, the wireless query performance of the passive wireless sensor can be greatly improved, so that the actual sensing performance of the sensor is improved; (2) the invention can also form a resonance sensor by using sensitive elements such as a resistance type, a capacitance type, an inductance type and the like which can form an RLC oscillation circuit, thereby realizing the wireless query of any passive resonance sensor.
Drawings
FIG. 1 is a schematic diagram of a passive wireless resonant sensor system according to the present invention;
FIG. 2 is a schematic diagram of a sensor tag duty cycle;
FIG. 3 is a schematic diagram of a sensor tag structure;
FIG. 4 is a schematic diagram of a passive wireless resonant sensor system of the present invention using a quartz resonator as the sensing element;
fig. 5 is a schematic diagram of an encoding method and a waveform relationship between an address of a wireless sensor tag and a resonant frequency of an oscillation signal.
Detailed Description
It is easily understood that according to the technical solution of the present invention, those skilled in the art can imagine various embodiments of the rfid passive wireless resonant sensor and system of the present invention that can be arbitrarily networked without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as all of the present invention or as limitations or limitations on the technical aspects of the present invention.
As shown in fig. 1 and 2, the radio frequency identification wireless sensor system includes an interrogator and a sensor tag, which has two duty cycles: the inquiry charging period T1 and the sensing output period T2, the inquiry charging period T1 is before, the sensing output period T1 is after, and no interval exists between the two periods. During the inquiry charging period T1, the interrogator generates a radio frequency inquiry signal (containing an energy supply signal), and the sensor label receives the radio frequency inquiry signal transmitted by the interrogator; in a sensing output period T2, the sensor label reflects the wireless sensing signal, the interrogator receives the wireless sensing signal and demodulates parameter information measured by the sensor.
The interrogator is similar to the interrogator of the existing RFID system in structure and mainly comprises a DSP, a microwave source, an interrogator end antenna, a receiving and transmitting isolator, a receiving channel, an oscillator, a clock and an external interface. In the inquiry charging period T1, the microwave source generates microwave signals under the control of the DSP, the microwave signals pass through the transmitting isolator and are transmitted out through the interrogator end antenna to obtain radio frequency inquiry signals, and the microwave signals provide microwave energy and inquiry signals for the sensor tag. In a sensing output period T2, an interrogator-side antenna receives an echo signal of a sensor tag, namely a wireless sensing signal, and the wireless sensing signal is sent to a receiving channel through a receiving-transmitting isolator, the receiving channel filters, amplifies, detects, demodulates and decodes the wireless sensing signal and then sends the wireless sensing signal to a DSP, and the DSP performs information extraction and processing to obtain ID information with the sensor tag and a frequency value of an oscillation signal output by an oscillator. The frequency value of the oscillation signal and the parameter to be measured have a one-to-one correspondence relationship.
The receiving channel comprises a filter circuit, an amplifying circuit, a detecting circuit and a demodulating and decoding circuit.
The DSP is a working core of the querier, and software implanted in the DSP completes tasks of receiving, sending and controlling, data reading and processing, external communication, networking and the like.
The transceiver isolator is used for receiving and transmitting the radio frequency query signal and the wireless sensing signal, isolating the radio frequency query signal and the wireless sensing signal, and preventing the signal of the transmitting channel from leaking to the receiving channel, and can be a circulator or a leakage signal canceller.
As shown in fig. 3, the sensor tag mainly includes a sensor antenna, a radio frequency front end, a power supply circuit, an oscillation circuit, a sensor, a frequency divider, an encoder, a memory, and a modulator.
The radio frequency front end mainly completes the impedance matching of the sensor end antenna and the load, and realizes the maximum coupling of energy, so that a power supply circuit can obtain enough microwave energy. The radio frequency front end is provided with a load modulation switch, when the load modulation switch is switched off, the impedance of the antenna at the sensor end is completely matched with the input impedance of the interrogator, the energy received by the antenna at the sensor end is coupled maximally, and the transmitted wireless sensing signal is minimum at the moment; when the load modulation switch is closed, the impedance of the antenna at the sensor end is mismatched with the input impedance of the interrogator, and the transmitted wireless sensing signal is maximum at the moment. The opening and closing of the load modulation switch causes the wireless sensor signal received by the interrogator to have a change of strong (1) and weak (0) states.
The power supply circuit mainly comprises a diode voltage multiplying circuit, a rectifying circuit, a storage capacitor and a power supply management circuit. In the inquiry charging period T1, the power supply circuit converts microwave energy into direct current electric energy and stores the direct current electric energy into the storage capacitor, when the voltage at two ends of the storage capacitor reaches a certain value, the sensor tag is triggered to work, namely the oscillation circuit is triggered to work and supplies power to the oscillation circuit, the frequency divider, the encoder, the modulator and the storage, and at the moment, the sensor tag enters a sensing output period T2.
The oscillating circuit and the sensitive element jointly form an oscillator, the frequency of an oscillating signal output by the oscillator is related to the sensitive element, and when the sensitive element senses the change of a parameter to be measured, the frequency of the oscillating signal changes.
The sensitive element can be various sensitive elements which can be placed in an oscillating circuit and is characterized in that the sensitive element has the characteristics of a resistor R, a capacitor C or an inductor L. When the parameter to be measured of the sensor changes, the resistance R, the capacitance C and the inductance L can be caused to change, or the resistance formed by the R, L, C or the RLC circuit changes, so that the frequency of the oscillation signal output by the oscillation circuit changes. In this case, the frequency of the oscillation signal output by the oscillation circuit (i.e., the resonant frequency of the oscillation circuit) has a one-to-one correspondence relationship with the parameter to be measured of the sensor. For example, the sensing element can be a temperature sensor based on a quartz resonator, or various sensors such as a quartz crystal microbalance and the like based on a quartz crystal resonator. The sensing element may also be a magneto-resistive, magneto-resistive or capacitive humidity sensing element (i.e. the capacitance value of the sensing element varies with humidity). For example, the resonant frequency of the oscillator formed by the quartz crystal resonator and the oscillation circuit is mainly determined by the quartz crystal resonator; the magnetic resistance, the magnetic impedance element and the capacitance variation element are used as peripheral elements of the oscillation circuit, so that the resonance frequency of the oscillator is related to the values of the elements (such as the resistance value of the magnetic resistance element, the capacitance value of the capacitance element and the like), and the values of the elements have one-to-one correspondence with the parameter to be measured.
The oscillation circuit may be various low-power consumption oscillation circuits such as a gate oscillation circuit, a pierce oscillation circuit, a miller oscillation circuit, or the like.
The oscillation signal output by the oscillator is used as a coding clock signal after frequency division, or can be directly used as the coding clock signal without frequency division).
The memory stores the address or ID information of the sensor tag, and may be an EEPROM (electrically erasable programmable read only memory), read only and write not.
The output waveform of the encoder contains two parts of information, the first part is address or ID information of the sensor tag, the second part is frequency information of the oscillation signal, for example, the data code of the part is compiled to be 0101010101010101, and then the waveform of the demodulated data is consistent with the clock waveform period/frequency.
The modulator is a load modulator, and is consistent with the load modulation principle and modulator composition in the existing RFID system. Applying the coded waveform from the coder to a modulation tube (such as MOSFET) in the modulator, controlling a load modulation switch at the front end of the radio frequency to be opened and closed according to the beat of the coded waveform, so that the impedance of an antenna at the interrogator end and the input impedance of the interrogator are changed between matching and mismatching, and the microwave power transmitted by the interrogator is absorbed in a maximized mode (corresponding to impedance matching) and a minimized mode (corresponding to impedance mismatching); correspondingly, the wireless sensing signal transmitted to the interrogator is minimized (0 state, corresponding to impedance match) and maximized (1 state, corresponding to impedance mismatch). After receiving the wireless sensing signal returned by the sensor tag, the interrogator demodulates the data clock information of the encoded data, so as to further obtain the corresponding sensor tag address and the oscillation resonant frequency.
Examples
Referring to FIG. 4, in the present embodiment, the oscillation circuit is adoptedThe gate oscillation circuit adopts a quartz resonance sensor as a sensitive element; an oscillator is composed of a gate oscillation circuit and a quartz resonance sensor; matching the impedance Z accordinglyLThe load modulation switch S forms a radio frequency front end; the power supply circuit is composed of a rectifying circuit, an energy storage capacitor and a power supply management circuit. Suppose ZAIs the sensor end antenna impedance, ZLIs the input impedance of the sensor tag.
In an inquiry charging period T1, a load modulation switch S is switched off, an antenna at a sensor end is in a load matching state, microwave power transmitted by an interrogator is absorbed to the maximum extent, a wireless sensing signal which returns back to the interrogator to the minimum extent, a sensor tag absorbs a radio frequency inquiry signal, the signal is rectified by a rectifying circuit to charge a storage capacitor and send voltage to a power management circuit, when voltage Vdd at two ends of the capacitor is large enough, the power management circuit triggers an oscillator to work, the sensor tag enters a sensing output period T2, and the power management circuit simultaneously outputs four paths of voltage to be used by a gate oscillation circuit, a frequency divider, an encoder and a modulator respectively. In a sensing output period T2, the modulator controls the load modulation switch S to open and close periodically at the frequency of the oscillation signal or its frequency-divided signal, when the load modulation switch S is closed, the sensor-side antenna load is short-circuited, and the wireless sensing signal received by the interrogator is strongest at this time, and when the load modulation switch S is closed, the wireless sensing signal received by the interrogator is weakest as shown above. In the sensing output period T2, the working state of the sensor tag is a power consumption process, which results in a decrease in the voltage Vdd across the storage capacitor, and when the voltage Vdd decreases to a certain value and cannot maintain the working state, the charging process is restarted, and the system is maintained in the working state.
Fig. 5 shows an example of the encoding method of the sensor tag address and the resonant frequency and the waveform relationship. In fig. 5, address and frequency code data are stored in memory, the first four bits of data 1011 representing an address and the next bits 0101010101 … … representing a frequency code. The oscillation signal frequency is fr, which is determined by the resonance frequency of the resonant sensor. The frequency of the oscillation signal is divided by 4 and then used as an encoding data clock to control the encoder to output a corresponding encoding signal. The interrogator demodulates the coded signal to reversely calculate the value of the resonant frequency.
Claims (9)
1. A radio frequency identification passive wireless resonance sensor tag capable of being networked randomly is characterized by comprising a sensor end antenna, a radio frequency front end, a power circuit, an oscillating circuit, a sensitive element, an encoder, a memory and a modulator; the oscillating circuit and the sensitive element form an oscillator;
the radio frequency front end comprises a matched impedance and a load modulation switch; the load modulation switch controls the matching and the mismatching of the matching impedance and the antenna impedance;
the power supply circuit rectifies and stores the coupling signal, and when the energy stored by the power supply circuit exceeds a threshold value, the oscillator, the encoder and the modulator are triggered to work;
the sensitive element senses a parameter to be measured;
the oscillating circuit sends an oscillating signal carrying parameter information to be detected to the encoder as an encoding clock signal;
the encoder reads a pre-stored sensor tag address or ID information from the memory, generates a coding signal under the control of a coding clock signal and controls the modulator to work; the coded signal comprises sensor address or ID information and frequency information of the oscillation signal;
and the modulator modulates the coded signal and transmits the modulated coded signal through the antenna at the sensor end under the control of the load modulation switch.
2. The ad hoc radio frequency identification passive wireless resonant sensor tag of claim 1, wherein the duty cycle comprises an inquiry charge cycle T1 and a sensor output cycle T2; the sensor tag receives a radio frequency query signal transmitted by an upstream interrogator for charging in a query charging period T1, and reflects a wireless sensing signal to the upstream interrogator in a sensing output period T2; there is no interval between the inquiry charging period T1 and the sense output period T2.
3. The arbitrarily networkable radio frequency identification passive wireless resonant sensor tag of claim 2, wherein the power circuit is comprised of a diode voltage multiplier circuit, a rectifier circuit, a storage capacitor, and a power management circuit; in the inquiry charging period T1, the power supply circuit converts the received radio frequency inquiry signal into direct current electric energy and stores the direct current electric energy into the storage capacitor, and when the voltage at two ends of the storage capacitor reaches a certain value, the power supply circuit is triggered to work and supplies power to the oscillation circuit, the frequency divider, the encoder, the modulator and the memory.
4. The arbitrarily networkable radio frequency identification passive wireless resonant sensor tag of claim 2, wherein when the load modulation switch is open, the sensor end antenna impedance matches the interrogator input impedance; when the load modulation switch is closed, the sensor side antenna impedance is mismatched with the interrogator input impedance.
5. The arbitrarily networkable radio frequency identification passive wireless resonant sensor tag of claim 2, wherein the tank circuit is one of a gate tank circuit, a pierce tank circuit, a miller tank circuit, or an RLC tank circuit.
6. The arbitrarily networked radio frequency identification passive wireless resonant sensor tag of claim 2, further comprising a frequency divider, wherein an oscillation signal output by the oscillator is divided as an encoded clock signal.
7. A sensor system networked using the sensor tags of any of claims 1-6, comprising an interrogator and the sensor tags; in the inquiry charging period T1, the interrogator transmits a radio frequency inquiry signal, and the sensor tag receives the radio frequency inquiry signal transmitted by the interrogator and maximizes the energy of the coupled radio frequency inquiry signal in an impedance matching state; in a sensing output period T2, a modulator in the sensor tag controls a modulation switch to be switched on and off according to the change rule of the coded signal, so that the wireless sensing signal with the reflected signal strength changing according to the code signal rule is reflected, and the interrogator receives the wireless sensing signal.
8. The sensor system of claim 7, wherein the interrogator comprises a DSP, a microwave source, an interrogator end antenna, a transceiver isolator, a receive channel, an oscillator, a clock, and an external interface; the transceiver isolator is used for transceiving isolation of the radio frequency query signal and the wireless sensing signal; the microwave source generates microwave signals under the control of the DSP, and the microwave signals pass through the transmitting isolator and are transmitted out through the interrogator end antenna; the wireless sensing signals are sent to the DSP through the transmitting isolator and the receiving channel, and the DSP performs information processing to obtain information with the sensor tags and the frequency value of the oscillation signals.
9. The sensor system of claim 8, wherein the receive channel comprises a filter circuit, an amplifier circuit, a detector circuit, and a demodulator and decoder circuit.
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| CN113191475B (en) * | 2021-05-21 | 2023-10-20 | 上海坤锐电子科技有限公司 | Circuit for passively returning sensor information and electronic tag system |
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| CN107516054A (en) | 2017-12-26 |
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