RU2342679C1 - Passive tracer of automatic identification system with possibility of object characteristics transmission - Google Patents

Passive tracer of automatic identification system with possibility of object characteristics transmission Download PDF

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Publication number
RU2342679C1
RU2342679C1 RU2007117202/09A RU2007117202A RU2342679C1 RU 2342679 C1 RU2342679 C1 RU 2342679C1 RU 2007117202/09 A RU2007117202/09 A RU 2007117202/09A RU 2007117202 A RU2007117202 A RU 2007117202A RU 2342679 C1 RU2342679 C1 RU 2342679C1
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RU
Russia
Prior art keywords
input
output
code generator
parameter
rfid tag
Prior art date
Application number
RU2007117202/09A
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Russian (ru)
Inventor
Николай Михайлович Легкий (RU)
Николай Михайлович Легкий
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Николай Михайлович Легкий
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Priority to RU2007117202/09A priority Critical patent/RU2342679C1/en
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Publication of RU2342679C1 publication Critical patent/RU2342679C1/en

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Abstract

FIELD: physics; radio.
SUBSTANCE: invention is related to the field of telemetering systems and may be used for remote control of object parameters, in particular, temperature of railway wheelset bearings. Result is achieved by introduction of parameter control detector, current source and analog-digital converter into available tracer. As parameter detector, any electric radio element may be used, which has dependence of internal resistance from any parameter, for instance, thermal resistance. As ADC and identification code generator, microchip may be used with extremely low consumption, for instance, of PIC12F683 type.
EFFECT: possibility to remotely measure object parameters with application of passive tracers.
5 cl, 1 dwg

Description

The invention relates to the field of telemetry systems and can be used for remote monitoring of parameters of objects, in particular the temperature of the bearings of the wheelsets of railway cars.

Known radio tag telemetric system for identifying objects [RF patent 2222030], consisting of an antenna, a generator, a power device, a synchronization device and a storage device.

The disadvantage of this device is the inability to change the data format during operation and transmit changing data.

The closest device is a passive RFID tag of the automatic identification system [RF patent No. 2097783, G01S 13/75] containing connected transceiver antenna, matching transformer and rectifier, nonlinear element, read-only memory, while the output of the rectifier is connected to the power input of read-only memory device, a non-linear element is connected to the output of the permanent storage device as a load.

The disadvantages of this device is the inability to transmit changing data.

The technical result of the invention is the ability to remotely measure object parameters using passive RFID tags.

The proposed technical effect is achieved by introducing a parameter monitoring sensor, a current source, and an analog-to-digital converter into the RFID tag.

The drawing shows a structural diagram of a RFID tag.

The RFID tag of the automatic radio frequency identification system contains a transceiver antenna 1, matching device 2, a nonlinear element 3, a rectifying device 4, and a code generator 5. The transceiver antenna 1, made in the form of a symmetrical half-wave emitter, is connected to the first one by the quarter wave part and the second quarter-wave part the second inputs of the matching device 2. The main task of the matching device 2 is to match the transceiver antenna 1 with the rest of the RF tag and increase changing the value of the input high-frequency signal to the value necessary to power the code generator 5. Since integrated circuits are used as the code generator, as a rule, created using MOS technologies, the voltage level, i.e. the EMF between the first and second inputs of the code generator 5, must be at least 1.5 ... 3.0 volts. In passive RFID tags, i.e. not containing current sources, the average current consumed by the code generator 5 should have a value of not more than 10 -4 A. In this case, the voltage multiplier has two inputs and two outputs. The transceiver antenna 1 is made in the form of a symmetrical half-wave emitter, with one quarter-wave part connected to the first, and the second quarter-wave part to the second inputs of the matching device 2, the first output of which is connected to the first output of the nonlinear element 3 and the first input of the rectifier 4, and the second output matching device 2 is connected to the second output of the nonlinear element 3, with the second input of the rectifying device 4 and the second input of the code generator 5. A part of the information generated by the generator 5 th code comprises data coming from the analog-to-digital converter (ADC) 6, the input of which receives the signal from the midpoint of the chain formed by the series connection of a current source 7 and 8 the sensor parameter.

The transceiver antenna 1 is structurally made on the sensor board obtained by etching.

As a matching device 2 can be performed as a quarter wave microstrip transformer from a copper conductor or in the form of a resonant LC circuit.

The rectifying device 4 can be performed on two Schottky diodes and a capacitor according to the voltage doubling circuit. The rectifying device 4 also includes a voltage limiter. As a voltage limiter from above, a zener diode for the corresponding voltage (voltage limit from above) and supervisors (reset generators), for example DS 1810/11/12/16/17, DS1833 (voltage limit from below) can be used.

As an ADC 6 and a code generator 5, an ultra-low power chip like PIC12F683 can be used.

To increase the energy pumping, the RF transmitter-receiver antenna is designed as a directional antenna with a reflector.

To measure temperature, the parameter 8 sensor is made in the form of a thermistor.

To measure the gas concentration, various gas sensors can be used as a parameter 8 sensor, for example, sensors designed to convert the partial pressure of oxygen (pO 2 ) or hydrogen (pH 2 ) in gas mixtures into an analog DC voltage signal [http: //www.insovt .ru / o2sensors /].

To measure the level of radiation as a parameter 8 sensor, for example, UV sensors can be used [http://daily.sec.ru/dailypblshow.cfm?rid=17&pid=17384]. Measurement of the dose of UV radiation is reduced to a simple measurement of the internal resistance of the structure when it is directly turned on.

For measuring pressure as a sensor of parameter 8, for example, sensors that convert pressure to an electrical signal based on the piezoelectric effect can be used.

As a current source 7 can be used, for example, stable current sources on field-effect transistors [Yu.F. Opadchiy, O.P. Gludkin, A.I. Gurov. Analog and Digital Electronics: A Textbook for High Schools. / Ed. Hotline - Telecom, 2002, p.226].

As a nonlinear element, for example, a field effect transistor or a diode can be used.

The sensor operates as follows.

Before installing the RFID tag on the identification object, the RFID tag is programmed. Identification information is recorded in any known manner in the code generator 5.

In the absence of radiation, there is no supply voltage in the RFID tag.

When the RFID tag falls into the area of the antenna pattern of the reader of the automatic identification system, the electromagnetic energy through the transceiver antenna 1 and matching device 2 is supplied to the rectifying device 4, where it is rectified by high-frequency diodes and capacitance. If the rectified voltage exceeds the maximum allowable voltage for the code 5 generator, the voltage is limited by the zener diode; if the rectified voltage is less than the allowable voltage, the supervisor does not supply voltage to the code 5 generator until the voltage on it reaches the required level. After the supply voltage appears on the code generator 5 and, therefore, on the current source 7, the current generator 7 generates a constant stable current in the load, which is the sensor of parameter 8. Any electric radio element having a dependence of the internal resistance on any parameter. To understand the processes under way, consider a thermistor with a temperature dependence of resistance. Since the current generated by the current source 7 is constant and independent of the load, and when the temperature changes, the resistance of the thermistor (sensor of parameter 8) changes, then, accordingly, the voltage incident on the thermistor (sensor of parameter 8) also changes. This voltage is fed to the input of the ADC 6, which converts it into a digital code, which in turn is recorded in a certain area of identification information, after which there is a cyclic transmission of this information from the output of the code generator 5 to the control input of the nonlinear element 3, which, in turn, changing the coordination of the transceiver antenna 1 of the RFID tag, it produces amplitude modulation of the electromagnetic radiation reflected from the transceiver antenna in accordance with the identification information.

Since a microprocessor with a built-in ADC is used as a code generator 5, the algorithm for writing data from the ADC to the identification information and its generation is previously recorded in the microprocessor memory.

Claims (5)

1. The RFID tag of the automatic identification system containing a transceiver antenna (1), a matching device (2), a nonlinear element (3), a rectifying device (4) and a code generator (5), while the output of the rectifying device (4) is connected to the first input a code generator (5), the output of which is connected to the control input of the nonlinear element (3), while the transceiver antenna (1), made in the form of a symmetrical half-wave emitter, is connected to the first by the quarter-wave part and the second input from the second quarter-wave dams of the matching device (2), the first output of which is connected to the first output of the nonlinear element (3) and the first input of the rectifying device (4), and the second output of the matching device (2) is connected to the second output of the nonlinear element (3), with the second input of the rectifying device (4) and the second input of the code generator (5), characterized in that an analog-to-digital converter (6), a current source (7) and a parameter sensor (8) are introduced into the RF tag, while the first input of the code generator (5) is connected with the input of the current source (7), and the output of the current source (7) connected to the first output of the parameter sensor (8) and to the input of an analog-to-digital converter (6), the output of which is connected to the third input of the code generator (5), the second input of which is connected to the second output of the parameter sensor (8).
2. The RFID tag according to claim 1, characterized in that the transceiver antenna is made as a directional antenna with a reflector.
3. The RFID tag according to claim 1, characterized in that the parameter sensor is made in the form of a thermistor.
4. The RFID tag according to claim 1, characterized in that the code generator and the analog-to-digital converter are made in the form of a serial microprocessor.
5. The RFID tag according to claim 1, characterized in that a supervisor is used as a limiter from below.
RU2007117202/09A 2007-05-08 2007-05-08 Passive tracer of automatic identification system with possibility of object characteristics transmission RU2342679C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU2007117202/09A RU2342679C1 (en) 2007-05-08 2007-05-08 Passive tracer of automatic identification system with possibility of object characteristics transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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RU2342679C1 true RU2342679C1 (en) 2008-12-27

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2461103C2 (en) * 2010-04-26 2012-09-10 Николай Михайлович Легкий Passive label for radio frequency identification system for transportation applications

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2461103C2 (en) * 2010-04-26 2012-09-10 Николай Михайлович Легкий Passive label for radio frequency identification system for transportation applications

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Effective date: 20100509