CN103454311A - RFID (radio frequency identification device) system for measuring smoke and method for measuring smoke - Google Patents
RFID (radio frequency identification device) system for measuring smoke and method for measuring smoke Download PDFInfo
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- CN103454311A CN103454311A CN201210183669XA CN201210183669A CN103454311A CN 103454311 A CN103454311 A CN 103454311A CN 201210183669X A CN201210183669X A CN 201210183669XA CN 201210183669 A CN201210183669 A CN 201210183669A CN 103454311 A CN103454311 A CN 103454311A
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Abstract
The invention provides an RFID (radio frequency identification device) system for measuring the concentration of smoke as well as a method for measuring the concentration of smoke. The RFID system for measuring the concentration of smoke comprises an RFID reader, a first RFID label and a second RFID label; the first RFID label and the second RFID label are provided with the same chip and the same antenna; the first RFID label is placed under a certain smoke concentration level and works at a first resonant frequency; the second RFID label is an RFID label with a smoke sensitive device; the smoke sensitive device forms a parallel structure together with the antenna of the second RFID label, and at the moment, the second RFID label is placed under a certain smoke concentration level and works at a second resonant frequency; the first RFID label and the second RFID label respectively receive commands sent by the RFID reader and feed back signals; the RFID reader is used for detecting the changes of smoke concentration through comparing differences of signal intensities at different frequencies of the first RFID label and the second RFID label. According to the invention, the smoke concentration variation can be detected with lower cost.
Description
Technical field
The present invention relates to RFID (Radio Frequency Identification, radio-frequency (RF) identification) technical field, relate in particular to a kind of method of surveying the rfid system of smoke density and surveying smoke density.
Background technology
In recent years, rfid system had become more prevalent.Rfid system is mainly used in the identification to people and thing.In general, this system at least comprises a RFID reader, and the radiofrequency signal from one or more RFID labels can be launched and accept to this RFID reader in the scope of a setting.This RFID label generally is encapsulated, can be attached on an object, it comprises the chip that an energy and antenna carry out information interchange, this chip is microchip, it is an integrated circuit in general, it can be used for storing and process information, the modulation /demodulation radiofrequency signal, and can move other specific function.The antenna of RFID label is for receiving and sending radiofrequency signal, and usually is applicable to a kind of special frequency.
In some equipment, when the smoke density that a kind of rfid system of surveying smoke density has been used to monitor product environment of living in has surpassed the acceptable smoke density.In general these equipment requirement induction installations will have a lasting energy source, are used for detecting the change of smoke density, but this can increase the cost of equipment.In addition, some equipment requirement induction installations also will be connected with a comparator circuit, thereby detect the degree size that departs from reference voltage, and this requirement has increased the cost of equipment greatly.In a word, improve rfid system and be necessary, it requires to be used for detecting smoke density when not using lasting energy source or using a kind of adjunct circuit cheaply and changes.
Summary of the invention
The embodiment of the present invention provides a kind of method of surveying the rfid system of smoke density and surveying smoke density, detects at lower cost smoke density and changes.
On the one hand, the embodiment of the present invention provides a kind of rfid system of surveying smoke density, the rfid system of described survey smoke density comprises: RFID reader, a RFID label and the 2nd RFID label, and a described RFID label and described the 2nd RFID label have identical chip and antenna; A described RFID label is placed under certain smoke density level, and the first resonant frequency and the signal intensity of the antenna of a described RFID label remain unchanged, and now a described RFID label is operated under the first resonant frequency; Described the 2nd RFID label, for the RFID label of band sense cigarette device, has two pins on the chip of described the 2nd RFID label; Two pins of described sense cigarette device and this are connected, and form parallel-connection structure with the antenna of described the 2nd RFID label, the variation of extraneous smoke density can cause the variation of the resistance of sense cigarette device own, now be placed under certain smoke density level, the characteristic frequency of the antenna of described the 2nd RFID label and signal intensity at least have one and change, and now described the 2nd RFID label is operated under the second resonant frequency; A described RFID label and described the 2nd RFID label receive respectively instruction the feedback signal that described RFID reader sends, and described RFID reader is by relatively detecting the change of smoke density from the difference between the signal intensity of a described RFID label and described the 2nd RFID label different frequency.
Optionally, in an embodiment of the present invention, the antenna of a described RFID label and described the 2nd RFID label is monopole antenna: the antenna of described sense cigarette device and described the 2nd RFID label forms parallel-connection structure.
Optionally, in an embodiment of the present invention, the antenna of a described RFID label and described the 2nd RFID label is double-doublet antenna: an antenna of described sense cigarette device and described the 2nd RFID label forms parallel-connection structure, or forms parallel-connection structure with two antennas simultaneously.
Optionally, in an embodiment of the present invention, described sense cigarette device is resistor-type sense cigarette device, and described sense cigarette device comprises: ionic smoke sensor device and other resistor-type sense cigarette devices.
On the other hand, the embodiment of the present invention provides a kind of rfid system of surveying smoke density, the rfid system of described survey smoke density comprises: RFID reader, a RFID label and the 2nd RFID label, and a described RFID label and described the 2nd RFID label have identical chip and antenna; A described RFID label is placed under certain smoke density level, and the first resonant frequency and the signal intensity of the antenna of a described RFID label remain unchanged, and now a described RFID label is operated under the first resonant frequency; Described the 2nd RFID label, for the RFID label of band sense cigarette device, has a pin on the chip of described the 2nd RFID label; One end of described sense cigarette device is connected with this pin, the other end is connected on the antenna of described RFID label, and form parallel-connection structure with antenna, the variation of extraneous smoke density can cause the variation of the resistance of sense cigarette device own, now be placed under certain smoke density level, the characteristic frequency of the antenna of described the 2nd RFID label and signal intensity at least have one and change, and now described the 2nd RFID label is operated under the second resonant frequency; A described RFID label and described the 2nd RFID label receive respectively instruction the feedback signal that described RFID reader sends, and described RFID reader is by relatively detecting the change of smoke density from the difference between the signal intensity of a described RFID label and described the 2nd RFID label different frequency.
Optionally, in an embodiment of the present invention, the antenna of a described RFID label and described the 2nd RFID label is monopole antenna: the antenna of described sense cigarette device and described the 2nd RFID label forms parallel-connection structure.
Optionally, in an embodiment of the present invention, the antenna of a described RFID label and described the 2nd RFID label is double-doublet antenna: an antenna of described sense cigarette device and described the 2nd RFID label forms parallel-connection structure, or forms parallel-connection structure with two antennas simultaneously.
Optionally, in an embodiment of the present invention, described sense cigarette device is resistor-type sense cigarette device, and described resistor-type sense cigarette device comprises: ionic smoke sensor device and other resistor-type sense cigarette devices.
Another aspect, the embodiment of the present invention provides a kind of rfid system of surveying smoke density, the rfid system of described survey smoke density comprises: RFID reader, a RFID label and the 2nd RFID label, and a described RFID label and described the 2nd RFID label have identical chip and antenna; A described RFID label is placed under certain smoke density level, and the first resonant frequency and the signal intensity of the antenna of a described RFID label remain unchanged, and now a described RFID label is operated under the first resonant frequency; Described the 2nd RFID label is the RFID label of band sense cigarette device, described sense cigarette device is connected on the antenna of described RFID label, and form parallel-connection structure with antenna, the variation of extraneous smoke density can cause the variation of the resistance of sense cigarette device own, now be placed under certain smoke density level, the characteristic frequency of the antenna of described the 2nd RFID label and signal intensity at least have one and change, and now described the 2nd RFID label is operated under the second resonant frequency; A described RFID label and described the 2nd RFID label receive respectively instruction the feedback signal that described RFID reader sends, and described RFID reader is by relatively detecting the change of smoke density from the difference between the signal intensity of a described RFID label and described the 2nd RFID label different frequency.
Optionally, in an embodiment of the present invention, the antenna of a described RFID label and described the 2nd RFID label is monopole antenna: the antenna of described sense cigarette device and described the 2nd RFID label forms parallel-connection structure.
Optionally, in an embodiment of the present invention, the antenna of a described RFID label and described the 2nd RFID label is double-doublet antenna: an antenna of described sense cigarette device and described the 2nd RFID label forms parallel-connection structure, or forms parallel-connection structure with two antennas simultaneously.
Optionally, in an embodiment of the present invention, described sense cigarette device is resistor-type sense cigarette device, and described resistor-type sense cigarette device comprises: ionic smoke sensor device and other resistor-type sense cigarette devices.
Again on the one hand, the embodiment of the present invention provides a kind of rfid system of surveying smoke density to survey the method for smoke density, described method is applied to the rfid system of above-mentioned survey smoke density, comprise: a described RFID label is placed under certain smoke density level, the first resonant frequency and the signal intensity of the antenna of a described RFID label remain unchanged, now a described RFID label is operated under the first resonant frequency: described the 2nd RFID label is placed under certain smoke density level, the characteristic frequency of the antenna of described the 2nd RFID label and signal intensity at least have one and change, now described the 2nd RFID label is operated under the second resonant frequency, send instruction to a described RFID label and described the 2nd RFID label receiving feedback signals by described RFID reader, difference while utilizing the more described RFID label of described RFID reader and described the 2nd RFID label work between the signal intensity of different frequency detects the change of smoke density.
Technique scheme has following beneficial effect: because adopt the rfid system of described survey smoke density to comprise: RFID reader, a RFID label and the 2nd RFID label, and a described RFID label and described the 2nd RFID label have identical chip and antenna; A described RFID label is placed under certain smoke density level, and a described RFID label is operated under the first resonant frequency; Described the 2nd RFID label is the RFID label of band sense cigarette device, and the antenna of described sense cigarette device and described the 2nd RFID label forms parallel-connection structure, now is placed under certain smoke density level, and described the 2nd RFID label is operated under the second resonant frequency; A described RFID label and described the 2nd RFID label receive respectively instruction the feedback signal that described RFID reader sends, described RFID reader is by relatively detecting the technological means of the change of smoke density from the difference between the signal intensity of a described RFID label and described the 2nd RFID label different frequency, so reached and detected at lower cost the technique effect that smoke density changes, and the energy that utilizes RFID to obtain, solved the powerup issue that smoke density detects.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is a kind of rfid system structural representation of surveying smoke density of the embodiment of the present invention;
Fig. 2 is the schematic diagram that embodiment of the present invention sense cigarette device is connected with the 2nd RFID label chip;
The equivalent circuit diagram that Fig. 3 is the embodiment of the present invention the 2nd RFID label chip inside antenna;
Fig. 4 is the schematic diagram that embodiment of the present invention sense cigarette device, the 2nd RFID label chip inside antenna equivalent electrical circuit are connected;
Fig. 5 is the schematic diagram that embodiment of the present invention sense cigarette device directly is connected with the RFID label antenna;
The structure key diagram that Fig. 6 is embodiment of the present invention sense cigarette device;
The method flow diagram that Fig. 7 is the survey smoke density of the embodiment of the present invention based on signal intensity.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.
As shown in Figure 1, survey the rfid system structural representation of smoke density for the embodiment of the present invention is a kind of, the rfid system of described survey smoke density comprises: RFID reader 1, a RFID label 2 and the 2nd RFID label 3, and a described RFID label 2 and described the 2nd RFID label 3 have identical chip and antenna; A described RFID label 2 is placed under certain smoke density level, and the first resonant frequency and the signal intensity of the antenna of a described RFID label 2 remain unchanged, and now a described RFID label 2 is operated under the first resonant frequency; Described the 2nd RFID label 3 is the RFID label of band sense cigarette device, the antenna of described sense cigarette device and described the 2nd RFID label 3 forms parallel-connection structure, the variation of extraneous smoke density can cause the variation of the resistance of sense cigarette device own, now be placed under certain smoke density level, the characteristic frequency of the antenna of described the 2nd RFID label 3 and signal intensity at least have one and change, and now described the 2nd RFID label 3 is operated under the second resonant frequency; A described RFID label 2 and described the 2nd RFID label 3 receive respectively instruction the feedback signal that described RFID reader 1 sends, and described RFID reader 1 is by relatively detecting the change of smoke density from the difference between the signal intensity of a described RFID label 2 and described the 2nd RFID label 3 different frequencies.The sense cigarette device of the embodiment of the present invention is connected and at least has three kinds of situations with the chip of the 2nd RFID label:
The two pins structure:
The embodiment of the present invention is a kind of rfid system that smoke density changes that is used for detecting.This system has comprised two RFID labels: a RFID label and the 2nd RFID label.Two pins are arranged on the chip of the 2nd RFID label, and sense cigarette device is connected with these two pins, with antenna, forms parallel-connection structure, and the variation of extraneous smoke density can cause the variation of the resistance of sense cigarette device own.Now be placed under certain smoke density level, the first resonant frequency and the signal intensity of the antenna of a RFID label remain unchanged.The characteristic frequency of the antenna of the 2nd RFID label and signal intensity at least have one and change, and now antenna is operated under the second resonant frequency.The RFID reader can send instruction to label, realizes communication, and the difference in the time of can working by comparison the one RFID label and the 2nd RFID label between the signal intensity of different frequency detects the change of smoke density.
With regard to an example, this system has comprised a kind of RFID label, and described label comprises a RFID label and the 2nd RFID label, and a RFID label and the 2nd RFID label all only have an antenna.Two pins are arranged on the chip of the 2nd RFID label, and sense cigarette device is connected with these two pins, with antenna, forms parallel-connection structure, and the variation of extraneous smoke density can cause the variation of the resistance of sense cigarette device own.Now be placed under certain smoke density level, the first resonant frequency and the signal intensity of the antenna of a RFID label remain unchanged.The characteristic frequency of the antenna of the 2nd RFID label and signal intensity at least have one and change, and now antenna is operated under the second resonant frequency.The RFID reader can send instruction to label, realizes communication, and the difference in the time of can working by comparison the one RFID label and the 2nd RFID label between the signal intensity of different frequency detects the change of smoke density.
Or rather, sense cigarette device should have lower resistance, and its instantiation comprises: ionic smoke sensor device and other resistor-type sense cigarette devices etc.
With regard to another example, this system has comprised two RFID labels: a RFID label and the 2nd RFID label; The one RFID label and the 2nd RFID label have two antennas.Two pins are arranged on the chip of the 2nd RFID label, and sense cigarette device is connected with these two pins, with two antennas, forms parallel-connection structure simultaneously.The variation of extraneous smoke density can cause the variation of the resistance of sense cigarette device own.This and the 2nd RFID the label only situation containing an antenna are similar.Now be placed under certain smoke density level, the first resonant frequency and the signal intensity of the antenna of a RFID label remain unchanged.The characteristic frequency of the antenna of the 2nd RFID label and signal intensity at least have one and change, and now antenna is operated under the second resonant frequency.The RFID reader can send instruction to label, realizes communication, and the difference in the time of can working by comparison the one RFID label and the 2nd RFID label between the signal intensity of different frequency detects the change of smoke density.Or rather, sense cigarette device should have lower resistance, and its instantiation comprises: ionic smoke sensor device and other resistor-type sense cigarette devices etc.
One pin configuration:
This system has comprised two RFID labels: a RFID label and the 2nd RFID label, a pin is arranged on the chip of the 2nd RFID label, and this pin outwards is connected with an end of sense cigarette device, and the other end of sense cigarette device is directly linked on antenna.Pin is similar in the situation of the tie point of chip internal and two pins, finally remains the purpose that will reach with the sky line parallel.The variation of extraneous smoke density can cause the variation of the resistance of sense cigarette device own.Now be placed under certain smoke density level, the first resonant frequency and the signal intensity of the antenna of a RFID label remain unchanged.The characteristic frequency of the antenna of the 2nd RFID label and signal intensity at least have one and change, and now antenna is operated under the second resonant frequency.The RFID reader can send instruction to label, realizes communication, and the difference in the time of can working by comparison the one RFID label and the 2nd RFID label between the signal intensity of different frequency detects the change of smoke density.
With regard to an example, this system has comprised two RFID labels: a RFID label and the 2nd RFID label; The one RFID label and the 2nd RFID label all only have an antenna.A pin is arranged on the chip of the 2nd RFID label, and sense cigarette device is connected with this pin, and the sense cigarette device other end is directly linked on antenna, with antenna, forms parallel-connection structure.The variation of extraneous smoke density can cause the variation of the resistance of sense cigarette device own.Now be placed under certain smoke density level, the first resonant frequency and the signal intensity of the antenna of a RFID label remain unchanged.The characteristic frequency of the antenna of the 2nd RFID label and signal intensity at least have one and change, and now antenna is operated under the second resonant frequency.The RFID reader can send instruction to label, realizes communication, and the difference in the time of can working by comparison the one RFID label and the 2nd RFID label between the signal intensity of different frequency detects the change of smoke density.Or rather, sense cigarette device should have lower resistance, and its instantiation comprises: ionic smoke sensor device and other resistor-type sense cigarette devices etc.
Without pin configuration:
This system has comprised two RFID labels: a RFID label and the 2nd RFID label, there is no pin on the chip of the 2nd RFID label, and sense cigarette device is directly linked on antenna.In this case, the antenna be connected with sense cigarette device can not break away from sense cigarette device and with normal frequency for communication.When being placed under certain smoke density level, the characteristic frequency of antenna and signal intensity at least have one and change.The RFID reader can send instruction to label apparatus, realizes communication, detects the change of smoke density from the difference between the signal intensity of the different frequency of a RFID label and the 2nd RFID label by comparison.
With regard to an example, this system has comprised two RFID labels: a RFID label and the 2nd RFID label; The one RFID label and the 2nd RFID label all only have an antenna.There is no pin on the chip of the 2nd RFID label, sense cigarette device is directly linked on antenna.The variation of extraneous smoke density can cause the variation of the resistance of sense cigarette device own.Now be placed under certain smoke density level, the first resonant frequency and the signal intensity of the antenna of a RFID label remain unchanged.The characteristic frequency of the antenna of the 2nd RFID label and signal intensity at least have one and change, and now antenna is operated under the second resonant frequency.The RFID reader can send instruction to label, and the difference between the signal intensity of the different frequency during by a RFID label relatively and second label work can detect the change of smoke density.Or rather, sense cigarette device should have lower resistance, and its instantiation comprises: ionic smoke sensor device and other resistor-type sense cigarette devices etc.
In the same way, can be with on the chip of antenna also and can not be with pin, can be with one also can be with a plurality of pins.The radical of antenna can be one, two or even many.Also can connect accordingly one or more sense cigarette devices, the model of simultaneously feeling the cigarette device can be the same or different.With regard to a kind of instantiation of device, when being placed under certain smoke density level, characteristic frequency and the signal intensity of the antenna be connected with sense cigarette device have at least a meeting to change.The RFID reader can send instruction to label apparatus, detects the change of smoke density from the difference between the signal intensity of the different frequency of antenna by comparison.
With regard to a kind of instantiation of feeling the cigarette device, the method for simultaneous comparison numerical value comprises that relatively numerical value and most signal strength values compare by these.These signal strength values belong to different frequencies, and interrelate with most smoke density values, simultaneously based on above-mentioned mention relatively can detect the level of smoke density.
Yet, with regard to another aspect, a rfid system comprises two RFID label apparatus and a RFID reader device.These two RFID label apparatus are used to send two kinds of signals,, the signal of the signal of the one RFID label and the 2nd RFID label, reader is received respectively the signal of a RFID label and the signal of the 2nd RFID label, through the fiducial value between the signal strength values of a RFID label of background process and the 2nd RFID label, and these fiducial values are converted into to the varying level of smoke density.
The schematic diagram of the sense cigarette-brand label 10 that are connected with the 2nd RFID label chip for embodiment of the present invention sense cigarette device as shown in Figure 2.In Fig. 2, label apparatus 10, comprise 13, two pins 16,17 of 15, one surface-mounted integrated circuits of a base and a double-doublet antenna 11,12.Two pins 16,17 are arranged on surface-mounted integrated circuit 13, and these two pins outwards are connected with sense cigarette device 14, and these two pins are in parallel with the equivalent electrical circuit of antenna at chip internal.This label can communicate with reader.
In an example, transmitting terminal 11,12 low electrical resistant material different by one or more made, these materials have higher electric conductivity, copper for example, silver, and aluminium, they and the above-mentioned sense cigarette device of mentioning are connected by two pins 16,17 and antenna 11,12, when antenna 11,12 are placed under certain smoke density level, and sense cigarette device can cause the variation of one or more transmitting terminal generation resonant frequencies, thereby causes a different frequency.The frequency of the variation of this frequency and reception and transmission is all different.For example, sense cigarette device is positioned under certain smoke density level, will cause transmission frequency and accept that in frequency, at least one changes.
In another example, the antenna frequencies value of setting at the beginning will be higher than the antenna frequencies under certain smoke density environment, and then, when reaching certain smoke density, it will reduce.In another example, the antenna frequencies of setting at the beginning is lower than the antenna frequencies under certain smoke density level, and when reaching certain smoke density level, it will rise.Can be used for such sense cigarette device of the present invention has: ionic smoke sensor device and other resistor-type sense cigarette devices etc.
Type difference based on sense cigarette device, causing the smoke density level changed may be that a specific smoke density value may be also a selectively scope of smoke density value.The length of time must cause the variation of antenna resonance frequency, and antenna quality also can cause different variations.For example, on antenna with the type of sense cigarette device can affect the length that changes the antenna resonance frequency required time.
As shown in Figure 3, be the equivalent circuit diagram of a RFID label antenna.When the tag coil antenna enters in the alternating magnetic field of read write line generation, the interaction between label antenna and reading and writing device antenna just is similar to transformer.Both coils are equivalent to primary coil and the secondary coil of transformer.The resonant tank formed by label antenna as shown in the figure, comprises coil inductance (L), the stray capacitance (C of label antenna
p) and shunt capacitance (C
2), its resonance frequency is
in formula, C is C
pand C
2equivalent capacity in parallel, R
1, R
2equivalent resistance for circuit internal inductance coil and other devices.The carrier frequency that label and read write line two-way communication are used is exactly f.When requiring, the tag antenna coil profile is very little, be that area is little, and need certain operating distance, the aerial coil mutual induction amount that RFID label and read write line are asked just obviously can not practical requirement, can be at the inner Ferrite Material with high permeability that inserts of tag antenna coil, to increase mutual induction amount, thus the little problem of compensating coil xsect.
As shown in Figure 4, be embodiment of the present invention sense cigarette device, the schematic diagram that is connected with the 2nd RFID label antenna equivalent electrical circuit.The resonant tank formed by label antenna as shown in the figure, comprises coil inductance (L), the stray capacitance (C of label antenna
p) and shunt capacitance (C
2), its resonance frequency is
formula C is C
pand C
2equivalent capacity in parallel, R
1, R
2equivalent resistance for circuit internal inductance coil and other devices.The variable resistor that M is representative sense cigarette device.This label is placed under certain smoke density level, and antenna is operated under the second resonant frequency, and its characteristic frequency and signal intensity at least have one and change.
As shown in Figure 5, can detect the sketch of the passive RFID tags device 40 of smoke density variation for the embodiment of the present invention.As shown in Figure 4, label apparatus 40 comprises 45, one integrated circuit 43 of a base and a double-doublet antenna 41,42.The sense cigarette device 44 be connected with antenna 42 will affect the resistance of antenna 42.Sense cigarette device 44 applicable materials can be controlled the frequency that any one had both been fixed a point according to the current voltage of any in antenna 41,42.With regard to an example, fixing up an aerial wire 41,42 can make it in identical frequency, produce resonance.With regard to another example, fixing up an aerial wire 41,42 can make it in different frequency, produce resonance.
In an example, transmitting terminal double-doublet antenna 41,42 low electrical resistant material different by one or more made, and these materials have higher electric conductivity, copper for example, silver, and aluminium, they are connected with the above-mentioned sense cigarette device of mentioning, when antenna 41,42 are placed under certain smoke density level, and sense cigarette device can cause the variation of one or more transmitting terminal generation resonant frequencies, thereby causes a different frequency.The frequency of the variation of this frequency and reception and transmission is all different.For example, sense cigarette device is positioned under certain smoke density level, will cause transmission frequency and accept that in frequency, at least one changes.
In another example, the antenna frequencies value of setting at the beginning will be higher than the antenna frequencies under certain smoke density environment, and then, when reaching certain smoke density, it will reduce.In another example, the antenna frequencies of setting at the beginning is lower than the antenna frequencies under certain smoke density level, and when reaching certain smoke density level, it will rise.The such sense cigarette device that can be used for this invention has: ionic smoke sensor device and other resistor-type sense cigarette devices etc.
Type difference based on sense cigarette device, causing the smoke density level changed may be that a specific smoke density value may be also a selectively scope of smoke density value.The length of time must cause the variation of antenna resonance frequency, and antenna quality also can cause different variations.For example, on antenna with the type of sense cigarette device can affect the length that changes the antenna resonance frequency required time.
As shown in Figure 6, be the ionic smoke sensor device, 51,52 is electrode, and it is by two radiomaterial americiums 241 (241Am) α source, forms and detects ionization chamber, and it can convert the smog that the substance combustion initial stage produces to electric signal.As shown in the figure, p1 is a relative electrode with p2 to the principle of work of single ionization chamber, is placed with radioactive source 241Am between electrode.Because it constantly emits alpha ray, α ion high-speed motion collisions with air molecules, thus make air molecule ionization between pole plate for positive ion and negative ion, make original uncharged air between electrode there is electric conductivity.If add a voltage E between pole plate p1 and p2, between pole plate, the negative ions of original disorderly and unsystematic motion is done well-regulated motion under the effect of electric field, thereby forms electric current I h between pole plate.The voltage applied is higher, and ionization current is larger, and when ionization current is increased to certain value, if impressed voltage still continues to raise, power current also can not increase again, and this electric current is called saturation current.
As shown in Figure 7, the method flow diagram of the survey smoke density for the embodiment of the present invention based on signal intensity, described method is applied to the rfid system of above-mentioned survey smoke density, comprising:
701, a described RFID label is placed under certain smoke density level, the first resonant frequency and the signal intensity of the antenna of a described RFID label remain unchanged, and now a described RFID label is operated under the first resonant frequency:
702, described the 2nd RFID label is placed under certain smoke density level, the characteristic frequency of the antenna of described the 2nd RFID label and signal intensity at least have one and change, and now described the 2nd RFID label is operated under the second resonant frequency;
703, send instruction to a described RFID label and described the 2nd RFID label receiving feedback signals by described RFID reader;
Difference while 704, utilizing the more described RFID label of described RFID reader and described the 2nd RFID label work between the signal intensity of different frequency detects the change of smoke density.
The RFID reader can be measured the energy intensity of receiving signal, calculates the fiducial value of a reaction signal intensity, then fiducial value is changed into to different smoke density values.With regard to an example, reader can be set the signal that a time period is used for receiving label, if do not receive signal, reader will be recorded as 0 by signal intensity.
In this system, the RFID reader will be from the signal strength values of the RFID label be not connected with sense cigarette device as a reference value, and it is compared with the signal strength values with feeling the 2nd RFID label that the cigarette device is connected.By receive from sense cigarette device, be connected and not with feel a RFID label that the cigarette device is connected and the signal of the 2nd RFID label, the RFID reader can be collected the fiducial value that represents unlike signal intensity.Then, the RFID reader can be converted into the residing smoke density level of label to such fiducial value.With regard to a concrete example, configuring this RFID reader is that the difference from connecting or do not connect the RF signal intensity of the RFID label of feeling the cigarette device that the reference data in order to store by use will receive is converted into the smoke density value.
Best situation is, using the RFID label that do not connect sense cigarette device as a reference, the variation that the coupling due between label and reader can be caused filters out.In addition, just as previously mentioned, sense cigarette device is applied in design the variation of the resistance value that can make it and time length that the 2nd RFID label is placed under specific smoke density forms relation one to one.The same, the application of the invention, at the RFID label under passive condition, the RFID reader can detect label apparatus whether be placed under certain smoke density and this smoke density whether within the acceptable range.
With the various RFID labels of two antennas, also can not perceive the variation of smoke density with sense cigarette device, the variation that the variation of perception smoke density is based on resonant frequency on antenna also can recognize the variation of antenna reception to signal.
For example, by the design of the antenna to being connected with sense cigarette device, can make the frequency of antenna at ISM (IndustrialScientific Medical, industry, science, medical science) the interior variation of frequency range, can connect this antenna be connected with sense cigarette device and logical circuit on the label of standard.
For example in a concrete example, label antenna can so be set, before in being exposed to certain smoke density environment, the resonant frequency of antenna is 902-928MHZ, once but label is exposed in certain smoke density environment, impact due to smoke density, the resonant frequency of antenna is just reduced to 899.5-927.5MHZ, frequency frequency range (902-928MHZ) at U.S. RFID is split into 52 channels, the channel that can not receive of skipping that reader can be random in these 52 channels goes, the benefit of this jump of reader is exactly effectively to prevent that a plurality of readers from attempting the conflict of using same frequency to cause in same physical space.
For example, in an example, RFID frequency range (902-928MHZ) is not to be divided into 52 channels but the antenna settings that on average has been divided into n channel tag is carried out work under this frequency range (902-928MHZ).Because label antenna is connected with sense cigarette device, so, as long as smoke density has surpassed the scope of predefined value, the frequency of operation of antenna tag antenna just drops among (899.5-927.5MHZ) this frequency range.Therefore compare and just channel n is got rid of and goes from band limits with original frequency range, the frequency range (899.5-927.5MH) after therefore changing just no longer allows label to carry out exchanging of information with channel n.
In concrete example, if the environment at label place has surpassed the smoke density scope of expection, reader can only send instruction to label by channel 1 to n-1, label also can be made a response, because the antenna in label just can only be worked in this frequency range, when reader sends instruction with the frequency of n channel to label, so no longer reach the 928MHZ label and just no longer make a response because the variation of label smoke density has caused the resonant frequency of label antenna to drop to 899.5-927.5MHZ, pass information back reader.
Favourable aspect is just by the disappearance of this information interchange, to be reflected due to variation that smoke density has exceeded the operating frequency of antenna that predefined value causes.
In model, reader can send an instruction between channel n-1 and channel n to label and further check that drift has occurred the operating frequency range of label antenna, because label can receive the instruction sent by channel n-1, and can be to the reader feedback information by channel n-1, because label can not receive the instruction sent by channel n, and can not can, to the reader feedback information, so just determine that drift has occurred the operating frequency range of label antenna by channel n.
The variation of smoke density causes the frequency of operation of label antenna that drift up and down and current invention occur being not limited in frequency range on average is divided into to n channel.
The embodiment of the present invention can detect at lower cost smoke density and change, and the energy that utilizes RFID to obtain, and has solved the powerup issue that smoke density detects.
The enforcement of each characteristics of this system may relate to software, the combination that hardware also may relate to software and hardware just can reach, and for example the enforcement of many advantages of system is to use a kind of high-caliber processing to realize with the mutual mode exchanged of computer and other equipment machines with OO programming language by programming.Each such function program may be stored in a storage intermediary and for example in ROM (read-only memory), by a computer and processor, be read to realize above-mentioned function.
Those skilled in the art can also recognize the various illustrative components, blocks (illustrativelogical block) that the embodiment of the present invention is listed, unit, and step can pass through electronic hardware, computer software, or both in conjunction with being realized.For the clear replaceability (interchangeability) of showing hardware and software, above-mentioned various illustrative components (illustrativecomponents), unit and step have been described their function generally.Such function is to realize depending on the designing requirement of specific application and whole system by hardware or software.Those skilled in the art can be for every kind of specific application, and can make ins all sorts of ways realizes described function, but this realization should not be understood to exceed the scope of embodiment of the present invention protection.
Various illustrative logical block described in the embodiment of the present invention, or unit can pass through general processor, digital signal processor, special IC (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the design of above-mentioned any combination realizes or operates described function.General processor can be microprocessor, and alternatively, this general processor can be also any traditional processor, controller, microcontroller or state machine.Processor also can realize by the combination of calculation element, for example digital signal processor and microprocessor, multi-microprocessor, a Digital Signal Processor Core of one or more microprocessors associating, or any other similarly configuration realize.
Method described in the embodiment of the present invention or the step of algorithm can directly embed hardware, the software module of processor execution or the two combination.Software module can be stored in the storage medium of other arbitrary form in RAM storer, flash memory, ROM storer, eprom memory, eeprom memory, register, hard disk, moveable magnetic disc, CD-ROM or this area.Exemplarily, storage medium can be connected with processor so that processor can be from storage medium reading information, and can deposit write information to storage medium.Alternatively, storage medium can also be integrated in processor.Processor and storage medium can be arranged in ASIC, and ASIC can be arranged in user terminal.Alternatively, processor and storage medium also can be arranged in the different parts in user terminal.
In one or more exemplary designs, the described above-mentioned functions of the embodiment of the present invention can realize in hardware, software, firmware or this three's combination in any.If realize in software, these functions can be stored on the medium with computer-readable, or are transmitted on the medium of computer-readable with one or more instructions or code form.The computer-readable medium comprises the computer storage medium and is convenient to make allows computer program transfer to other local telecommunication media from a place.Storage medium can be the useable medium that any general or special computer can access.For example, such computer readable media can include but not limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage device, or other anyly can be read by general or special computer or general or special processor the medium of the program code of form with instruction or data structure and other for carrying or storage.In addition, any connection can suitably be defined as the computer-readable medium, for example,, if software is by a concentric cable, optical fiber computer, twisted-pair feeder, Digital Subscriber Line (DSL) or also being comprised in defined computer-readable medium with wireless way for transmittings such as infrared, wireless and microwave from a web-site, server or other remote resource.Described video disc (disk) and disk (disc) comprise Zip disk, radium-shine dish, CD, DVD, floppy disk and Blu-ray Disc, and disk is usually with the magnetic duplication data, and video disc carries out the optical reproduction data with laser usually.Above-mentioned combination also can be included in the computer-readable medium.
Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only the specific embodiment of the present invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (13)
1. a rfid system of surveying smoke density, is characterized in that, the rfid system of described survey smoke density comprises: RFID reader, a RFID label and the 2nd RFID label, and a described RFID label and described the 2nd RFID label have identical chip and antenna; A described RFID label is placed under certain smoke density level, and the first resonant frequency and the signal intensity of the antenna of a described RFID label remain unchanged, and now a described RFID label is operated under the first resonant frequency; Described the 2nd RFID label, for the RFID label of band sense cigarette device, has two pins on the chip of described the 2nd RFID label; Two pins of described sense cigarette device and this are connected, and form parallel-connection structure with the antenna of described the 2nd RFID label, the variation of extraneous smoke density can cause the variation of the resistance of sense cigarette device own, now be placed under certain smoke density level, the characteristic frequency of the antenna of described the 2nd RFID label and signal intensity at least have one and change, and now described the 2nd RFID label is operated under the second resonant frequency; A described RFID label and described the 2nd RFID label receive respectively instruction the feedback signal that described RFID reader sends, and described RFID reader is by relatively detecting the change of smoke density from the difference between the signal intensity of a described RFID label and described the 2nd RFID label different frequency.
2. survey as claimed in claim 1 the rfid system of smoke density, it is characterized in that, the antenna of a described RFID label and described the 2nd RFID label is monopole antenna: the antenna of described sense cigarette device and described the 2nd RFID label forms parallel-connection structure.
3. survey as claimed in claim 1 the rfid system of smoke density, it is characterized in that, the antenna of a described RFID label and described the 2nd RFID label is double-doublet antenna: an antenna of described sense cigarette device and described the 2nd RFID label forms parallel-connection structure, or forms parallel-connection structure with two antennas simultaneously.
4. survey as claimed in claim 1 the rfid system of smoke density, it is characterized in that, described sense cigarette device is resistor-type sense cigarette device, and described sense cigarette device comprises: ionic smoke sensor device and other resistor-type sense cigarette devices.
5. a rfid system of surveying smoke density, is characterized in that, the rfid system of described survey smoke density comprises: RFID reader, a RFID label and the 2nd RFID label, and a described RFID label and described the 2nd RFID label have identical chip and antenna; A described RFID label is placed under certain smoke density level, and the first resonant frequency and the signal intensity of the antenna of a described RFID label remain unchanged, and now a described RFID label is operated under the first resonant frequency; Described the 2nd RFID label, for the RFID label of band sense cigarette device, has a pin on the chip of described the 2nd RFID label; One end of described sense cigarette device is connected with this pin, the other end is connected on the antenna of described RFID label, and form parallel-connection structure with antenna, the variation of extraneous smoke density can cause the variation of the resistance of sense cigarette device own, now be placed under certain smoke density level, the characteristic frequency of the antenna of described the 2nd RFID label and signal intensity at least have one and change, and now described the 2nd RFID label is operated under the second resonant frequency; A described RFID label and described the 2nd RFID label receive respectively instruction the feedback signal that described RFID reader sends, and described RFID reader is by relatively detecting the change of smoke density from the difference between the signal intensity of a described RFID label and described the 2nd RFID label different frequency.
6. survey as claimed in claim 5 the rfid system of smoke density, it is characterized in that, the antenna of a described RFID label and described the 2nd RFID label is monopole antenna: the antenna of described sense cigarette device and described the 2nd RFID label forms parallel-connection structure.
7. survey as claimed in claim 5 the rfid system of smoke density, it is characterized in that, the antenna of a described RFID label and described the 2nd RFID label is double-doublet antenna: an antenna of described sense cigarette device and described the 2nd RFID label forms parallel-connection structure, or forms parallel-connection structure with two antennas simultaneously.
8. survey as claimed in claim 5 the rfid system of smoke density, it is characterized in that, described sense cigarette device is resistor-type sense cigarette device, and described resistor-type sense cigarette device comprises: ionic smoke sensor device and other resistor-type sense cigarette devices.
9. a rfid system of surveying smoke density, is characterized in that, the rfid system of described survey smoke density comprises: RFID reader, a RFID label and the 2nd RFID label, and a described RFID label and described the 2nd RFID label have identical chip and antenna; A described RFID label is placed under certain smoke density level, and the first resonant frequency and the signal intensity of the antenna of a described RFID label remain unchanged, and now a described RFID label is operated under the first resonant frequency; Described the 2nd RFID label is the RFID label of band sense cigarette device, described sense cigarette device is connected on the antenna of described RFID label, and form parallel-connection structure with antenna, the variation of extraneous smoke density can cause the variation of the resistance of sense cigarette device own, now be placed under certain smoke density level, the characteristic frequency of the antenna of described the 2nd RFID label and signal intensity at least have one and change, and now described the 2nd RFID label is operated under the second resonant frequency; A described RFID label and described the 2nd RFID label receive respectively instruction the feedback signal that described RFID reader sends, and described RFID reader is by relatively detecting the change of smoke density from the difference between the signal intensity of a described RFID label and described the 2nd RFID label different frequency.
10. survey as claimed in claim 9 the rfid system of smoke density, it is characterized in that, the antenna of a described RFID label and described the 2nd RFID label is monopole antenna: the antenna of described sense cigarette device and described the 2nd RFID label forms parallel-connection structure.
11. survey as claimed in claim 9 the rfid system of smoke density, it is characterized in that, the antenna of a described RFID label and described the 2nd RFID label is double-doublet antenna: an antenna of described sense cigarette device and described the 2nd RFID label forms parallel-connection structure, or forms parallel-connection structure with two antennas simultaneously.
12. survey as claimed in claim 9 the rfid system of smoke density, it is characterized in that, described sense cigarette device is resistor-type sense cigarette device, described resistor-type sense cigarette device comprises: ionic smoke sensor device and other resistor-type sense cigarette devices.
A 13. method of surveying the rfid system survey smoke density of smoke density, it is characterized in that, described method is applied to the rfid system of the described survey smoke density of any one in claim 1-4, or the rfid system of the described survey smoke density of any one in claim 5-8, or the rfid system of the described survey smoke density of any one in claim 9-12, comprising:
A described RFID label is placed under certain smoke density level, the first resonant frequency and the signal intensity of the antenna of a described RFID label remain unchanged, now a described RFID label is operated under the first resonant frequency: described the 2nd RFID label is placed under certain smoke density level, the characteristic frequency of the antenna of described the 2nd RFID label and signal intensity at least have one and change, and now described the 2nd RFID label is operated under the second resonant frequency;
Send instruction to a described RFID label and described the 2nd RFID label receiving feedback signals by described RFID reader;
Difference while utilizing the more described RFID label of described RFID reader and described the 2nd RFID label work between the signal intensity of different frequency detects the change of smoke density.
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| CN201210183669.XA CN103454311B (en) | 2012-06-01 | 2012-06-01 | A kind of rfid system surveying cigarette and the method surveying cigarette thereof |
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| CN201210183669.XA CN103454311B (en) | 2012-06-01 | 2012-06-01 | A kind of rfid system surveying cigarette and the method surveying cigarette thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100079288A1 (en) * | 2008-09-30 | 2010-04-01 | Timothy Collins | RFID Tag Device with Temperature Sensitive Antenna |
| CN201662822U (en) * | 2009-12-30 | 2010-12-01 | 上海真灼电子技术有限公司 | Semi-active RFID temperature measuring label |
| US20110291807A1 (en) * | 2010-05-27 | 2011-12-01 | The Hong Kong University Of Science And Technology | Low voltage low power CMOS temperature sensor circuit |
| US20120031979A1 (en) * | 2010-08-09 | 2012-02-09 | Kang Hee-Bok | Rfid tag |
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2012
- 2012-06-01 CN CN201210183669.XA patent/CN103454311B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100079288A1 (en) * | 2008-09-30 | 2010-04-01 | Timothy Collins | RFID Tag Device with Temperature Sensitive Antenna |
| CN201662822U (en) * | 2009-12-30 | 2010-12-01 | 上海真灼电子技术有限公司 | Semi-active RFID temperature measuring label |
| US20110291807A1 (en) * | 2010-05-27 | 2011-12-01 | The Hong Kong University Of Science And Technology | Low voltage low power CMOS temperature sensor circuit |
| US20120031979A1 (en) * | 2010-08-09 | 2012-02-09 | Kang Hee-Bok | Rfid tag |
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