CN102622641A - Passive radio frequency sensing device - Google Patents
Passive radio frequency sensing device Download PDFInfo
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- CN102622641A CN102622641A CN2011100324810A CN201110032481A CN102622641A CN 102622641 A CN102622641 A CN 102622641A CN 2011100324810 A CN2011100324810 A CN 2011100324810A CN 201110032481 A CN201110032481 A CN 201110032481A CN 102622641 A CN102622641 A CN 102622641A
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Abstract
The invention discloses a passive radio frequency sensing device. After an external radio frequency signal excites the device, a sensing film 2 is added on a surface of a radio frequency antenna 3 to detect a dielectric constant or change of the dielectric constant of a substance in a sensing area. A detection result is recorded in a storage space of a chip 4. An external radio frequency device is used to read information in the chip so as to realize non-intrusive detection to the substance or the change of the substance. The device can be used for characteristic detection of an object under any environment. A passive working mode is used and the device is suitable for long time operation.
Description
Technical field
The present invention relates to field of radio frequency communication, particularly the near field communication field; The chemistry and the bio-sensing that the present invention also relates to chemistry and biosensor technique field, particularly electronic tag are used.Technology of the present invention can be widely used in change procedure and the result of relevant with the Internet of Things sensing detection material based on electronic tag, the safety detection and the control of poisonous and harmful substance.
Background technology
In recent years, constantly popularizing of Internet of Things notion promoted popularizing based on the near field radio frequency communication technology.The particularly appearance of various forms of electronic tags and application lets the extensive application of near field radio frequency communication become possibility.But; The conventional near field radio frequency communication technology is in the elementary application stage basically; Because at present most application does not have a kind of effective ment to let near field radio frequency communication can initiatively go to obtain the information that needs, but data processing and the circulation of mode to obtain follow-up each point of application through artificial writing information.Only have under the situation of only a few, adopt active sensor and electronics active label to combine, realize automatic data acquisition and application.But in this case, often complicated circuit, apparatus expensive, reliability can't satisfy the requirement of rugged surroundings; Add and must use the active circuit system, the serviceable life of battery is limited; Therefore can't large-scale popularization to the situation that needs to use for a long time, environment is abominable, low cost etc. requires.
The current main near field radio frequency communication technology mainly is divided into passive and active two kinds; The passive near field radio frequency communication technology comprises the low frequency passive electronic tag of following several types: 125KHz ~ 130KHz, the high frequency passive electronic tag of 13.56MHz, the ultra-high-frequency passive electronic tag of 850 ~ 960MHz.Only can accomplish the data recording application bar none based on the passive electronic label technology.Like the China second-generation identity card of the electronic tag train ticket of the care of animal label of low frequency, high frequency and Bus Card and China, ultrahigh frequency logistics electronic tag etc.The ultrahigh frequency active electronic label of the active NFC communication technology of the high frequency that the active near field radio frequency communication technology comprises following several types: 13.56MHz, 850 ~ 960MHz, 2.45GHz and the active technology for radio frequency of 5.8GHz microwave frequency band.When active radio communication integrated circuit with microprocessor is organic be connected after; The sensor that connects appointed function at the input port of microprocessor; Can realize information stores with sensor sensing in the memory block of microprocessor or radio frequency chip, again the wireless transmission function through radio frequency chip with data transmission to read-write equipment.Such as in the process of cold chain transportation, the temperature variations in the function ability trace back process of necessary employing temperature real time record is to guarantee the safety of chilled goods.In the rotten unusual reflection that causes after vaccine is planted of children's vaccine that China occurs, cause the environment management and control is unreasonable in the transportation.Again such as in the malicious milk powder case that occurs at Chinese the first two years; The qualitative control department of production plant and national food safety management at different levels department can't judge in-problem milk powder at all timely and effectively; Cause malicious milk powder to come into the market very long one period, caused the Health cost of many life! Up to the present, also there are not a kind of means can really carry out management and control effectively.Because no matter be that date of manufacture, prescription are described, still various sampling observations only can accomplish to a certain extent than stricter before control, but fundamentally, the prerequisite that realizes these management and control still are artificial processing.Careless slightly or interests are ordered about, and still can't stop the recurrence of this type of incident.
In the application of near field radio frequency communication; Sensor has just become to let the core of electronic label intelligentization; Have only through sensor and initiatively all sidedly object is detected objectively, the really effect of performance electronic tag is safe, efficient, healthy Internet of Things service in the future.Therefore, how to realize product cheaply, the application demand that makes product adaptation use, meet various rugged surroundings for a long time is the key of sensor technology.
Summary of the invention
The present invention is directed to that present near field radio frequency is communicated by letter existing defective and a kind of passive radio frequency sensing device of providing; Can realize the sensor function of passive RF electronic tag, materials such as solid, liquids and gases carried out the detection of basic characteristic detection and characteristic variations.Simultaneously, as passive device, the long service life of product need not be safeguarded, is adapted at using under the various rugged surroundings.
In order to achieve the above object, the present invention adopts following technical scheme:
A kind of passive radio frequency sensing device, said passive radio frequency sensing device has comprised antenna, chip, base material; Certain applications also need a kind of special sense film.
Further, the antenna of said passive radio frequency sensing device can be many circle inductance type antennas, also can be poliarizing antenna.The form processing of antenna can obtain through etch process, also can obtain through printing or printing type.
Further again, the chip of said passive radio frequency sensing device meets the radio electronic label requirement, and its storage space is readable to be write.Being connected of chip and antenna can be adopted surface mounting technology, encapsulation technology, lead-in wire nation decide various forms such as technology.
Further again, the base material of said passive radio frequency sensing device is a kind of insulating medium, and like materials such as epoxy resin base plate, mylar, Kapton, paper, the surface that is adapted at base material makes antenna, welding chip with adhere to sense film.
Further again, the sense film of said passive radio frequency sensing device is multiple compound, according to the different detection object, needs to use the sense film by different qualities.As when detecting ammonia, using a polyaniline sense film; And monitor employing polyurethane sense film in detection polarity and nonpolar toxic gas.
Further again, said passive radio frequency sensing device improves the sensitivity of variation of the relative dielectric constant of object to be detected through sense film under the situation of radio-frequency antenna generation resonance, and the situation that material changes is judged in the influence that finally former resonance characteristic is produced.
Further again, said passive radio frequency sensing device can be non-intrusion detection to the detection of object relative dielectric constant, and sense film does not directly contact with testee, can be intrusion detection yet, and sense film can directly contact with testee.
The passive radio frequency sensing device that forms according to technique scheme can be to the variation of solid, the relative dielectric constant of liquids and gases under various situation, thereby judges the immediate status of object exactly.When radio electronic label received the radiofrequency signal that exterior read-write equipment provides, the carrier wave that the rectification circuit of chip internal receives antenna converted direct current to and makes chip operation.Chip sends handshake, makes read-write equipment and chip obtain believable communication.In initialization procedure, read-write equipment writes the current information that label detected in the storer of label, as a basic data.This basic data should have the scope of a directiveness, if exceeded scope, then object to be detected does not meet predetermined requirement; Otherwise, think that then basic data is correct, will be as a reference when detecting with basic data next time.
Utilize technology of the present invention can realize secure ID and detection, like the batching accordance and the freshness detection of dairy produce and beverage to various food; The prescription of milk powder and powdery type food and ratio accordance detect; The freshness of food such as meat products, vegetables detects; The fruits food freshness detects; Hazardous gas detects, and uses like mine safety; River, ocean water quality monitoring; Soil monitoring or the like.
Description of drawings
Further specify the present invention below in conjunction with accompanying drawing and embodiment.
Fig. 1 is a passive radio frequency sensing device three-dimensional appearance synoptic diagram of the present invention.
Fig. 2 encloses antenna plane and cross-sectional view for passive radio frequency sensing device of the present invention more.
Fig. 3 is passive radio frequency sensing device of the present invention poliarizing antenna plane and cross-sectional view.
Fig. 4 carries out non-intrusion method for testing synoptic diagram for utilizing passive radio frequency sensing device of the present invention.
Fig. 5 carries out the intrusion method for testing synoptic diagram for utilizing passive radio frequency sensing device of the present invention.
Fig. 6 is a radio frequency signal frequency characteristic synoptic diagram of the present invention.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect and be easy to understand and understand, below in conjunction with concrete diagram, further set forth the present invention.
The objective of the invention is through being used of radio electronic label and sense film, the variation of the relative dielectric constant of detected material is compared, thereby obtain the foundation that material changes.
For this reason; The present invention provides a kind of passive radio frequency sensing device 7; This passive radio frequency sensing device 7 is used with special-purpose read-write equipment 9; Form complete bi-directional RF signal transmitting and receiving circuit, the radio electronic label 7 and the frequency read/write 9 of belt sensor carry out direct or indirect exchanges data, form a complete RF communication system.
Above-mentioned passive radio frequency sensing device 7 is fit to be applied in the RF communication system of communications bands such as low frequency, high frequency and ultrahigh frequency and uses;
Embodiment one
This embodiment is for adopting flip-chip technology; As shown in Figure 3; To have the ultra-high-frequency passive radio frequency chip 4 of ISO18000-6C communication protocol and the circuit 3 of FPC and fit, the function pads on the chip 4 reliably is connected through solid with function pads on the FPC.
The chip 4 of the 915MHz twireless radio-frequency communication function of built-in ultra-high-frequency passive radio circuit is a core among this embodiment, and the FPC of a slice is integrated polarization radio-frequency antenna 3 is formed.Chip 4 is through planting ball technology, on pad, processed to be used for and the direct-connected salient point of antenna bond pad, and this salient point is a gold goal, has good electrical conductivity, minimum contact impedance, in air, has advantages of excellent stability.Gold goal is fit to the requirement of flip-chip technology in chip 1 surface protrusion certain height.Simultaneously, chip need be through reduction process with the reduced thickness of body to suitable thickness, to obtain satisfactory product thickness.The thickness of present embodiment is selected 250um, in different thickness requirements, can attenuate becomes the thickness of any needs, with the product thickness requirement of realizations needs.
The chip 4 that the process salient point processes need add solid before mounting on the FPC on corresponding bonding pad on the FPC, this solid can be unidirectional different in nature conducting resinl, also can be non-conductive adhesive.Chip 4 mounts correspondence position through upside-down mounting equipment, makes through heating, pressurization operation then that pad on gold goal and the FPC on the chip is effective to be connected and solid is solidified.
Like Fig. 4 and shown in Figure 5, radio-frequency antenna had both been born the effect that the needed electric energy of radio frequency chip work is provided in radio frequency communications circuitry, also was the carrier that transmits rf communication signal 8.In order to make the good effect of antenna performance, must make antenna have enough sensitivity.In the present embodiment, the requirement that we use the size conforms of antenna is designed to open polarization type antenna, and the impedance of antenna and the characteristic of chip are complementary.
At the part installed surface, adopt spraying technology to be coated with the sense film 2 of last layer 0.1mm thickness in antenna surface, this sense film is a jelly, need under suitable temperature, dry, solidify.
Product after the processing is worked into product design the size that needs through clicking technique.40X30mm。Stick the adhesive tape of one deck band release liners at the part installed surface, punch out the empty avoiding figure, guarantee that the discord part is interfered when fitting in the appropriate location of adhesive tape.
The release liners of the product that processes is peeled off,, can be attached to the surface of nonmetallic vessel 6, the object 5 that needs detection is arranged in the container referring to Fig. 4 and Fig. 5; The object 5 that needs to detect can be a liquid, also can be the material of pulverulent solids or other forms.
When card reader was communicated by letter with passive radio frequency sensing device of the present invention, special-purpose card reader 9 was sent one group of instruction, has activated the passive radio frequency sensing device through wireless carrier 8; Feed back an instruction simultaneously and give special-purpose card reader 9; Frequency characteristic at this time is shown in 10 curves of Fig. 6, and its working frequency points is 13.56MHz, and wave-shape amplitude is 6.6DIV; Through the read write line computing, can relevant data such as significant datas such as Q value and basic specific inductive capacity be write in the storage area of chip; When having arrived next detection time of point, the frequency characteristic of measuring is shown in 11 curves of Fig. 6, and its working frequency points is 13.86MHz; Wave-shape amplitude is 5.8DIV; Simultaneously, read write line is read the back with basic data and is compared with current data, after the difference of parameter is partly passed through and the database of read write line is tabled look-up; Reflect current states and specify, so just accomplished the processing and the application process of the radio electronic label of entire belt sensor.
Embodiment two
This embodiment is connected with the epoxy resin wiring board for adopting the direct nation of chip to decide the high frequency passive radio frequency chip that technology will have ISO15693 communication protocol; Referring to Fig. 2; Function pads on function pads on the chip and the wiring board reliably is connected through the ultrasound wave lead-in wire; Again with encapsulating compound with chip and lead packages in encapsulated member 4, with protection chip and lead-in wire.
Chip through reduction process with the reduced thickness of body to suitable thickness, to obtain satisfactory product thickness.The thickness of present embodiment is selected 80um, in different thickness requirements, can attenuate becomes the thickness of any needs, with the product thickness requirement of realizations needs.At first, on the corresponding position of wiring board, put an amount of solid, starch like silver through spot gluing equipment.Through chip attachment equipment chip attachment is arrived the corresponding position of wiring board then, then through heating furnace solid is solidified semi-manufacture.Semi-manufacture after the curing couple together pad on the chip and the pad on the wiring board through wire bonds equipment.The lead-in wire that connects usefulness can be gold thread, aluminum steel or copper cash.Through packaging technology chip and lead-in wire are sealed at last.The mode of sealing can be to adopt liquid resin glue point glue to seal or the encapsulation of solid resin glue ejection formation.
Capacitor selection volume is little, the standardized product of thin thickness.It is 1.2mm that the capacitor of present embodiment is selected length, and width is 0.6mm, and thickness is the standard specification capacitor of 0.5mm, and its capacity is 39pF, and the capacitance precision is ± 5%.The appearance value of capacitor and precision are to confirm for the resonance frequency that cooperates resonant antenna, and in the present embodiment, for guaranteeing the requirement of resonance frequency at 13.56MHz ± 300KHz, the precision of capacitor can not be greater than ± 5%.Capacitor welds through surface mount process and wiring board.At first printed solder paste on the wiring board corresponding bonding pad mounts correspondence position through surface-mounting equipment with capacitor again, through the reflow soldering heating solder(ing) paste is solidified at last, accomplishes the processing of capacitor.
Radio-frequency antenna 3 had both been born the effect that the needed electric energy of radio frequency chip work is provided in radio frequency communications circuitry, also be the carrier that transmits rf communication signal.In order to make the good effect of antenna performance, must make antenna have enough inductance values, also to make the coil section of antenna long-pending enough big.In the present embodiment, the requirement that we use the size conforms of antenna, the rich line formula antenna of design 8 circles, line directly is 0.15mm, the spacing between line and the line is 0.15mm.
Other processes are identical with embodiment one.
Claims (7)
1. passive radio frequency sensing device, said passive radio frequency sensing device has comprised antenna, chip, base material; Certain applications also need a kind of special sense film.
2. the antenna of the described passive radio frequency sensing device of claim 1 can be many circle inductance type antennas, also can be poliarizing antenna;
The form processing of antenna can obtain through etch process, also can obtain through printing or printing type.
3. the chip of the described passive radio frequency sensing device of claim 1 meets the radio electronic label requirement, and its storage space is readable to be write; Being connected of chip and antenna can be adopted surface mounting technology, encapsulation technology, lead-in wire nation decide various forms such as technology.
4. the base material of the described passive radio frequency sensing device of claim 1 is a kind of insulating medium, and like materials such as epoxy resin base plate, mylar, Kapton, paper, the surface that is adapted at base material makes antenna, welding chip with adhere to sense film.
5. the sense film of the described passive radio frequency sensing device of claim 1 is multiple compound, according to the different detection object, needs to use the sense film by different qualities; As when detecting ammonia, using a polyaniline sense film; And monitor employing polyurethane sense film in detection polarity and nonpolar toxic gas.
6. the described passive radio frequency sensing device of claim 1 is under the situation of radio-frequency antenna generation resonance; Improve the sensitivity of variation of the relative dielectric constant of object to be detected through sense film, the situation that material changes is judged in the influence that finally former resonance characteristic is produced.
7. the described passive radio frequency sensing device of claim 1 can be non-intrusion detection to the detection of object relative dielectric constant, and sense film does not directly contact with testee, also can be intrusion detection, and sense film can directly contact with testee.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110032481.0A CN102622641B (en) | 2011-01-30 | 2011-01-30 | A kind of passive radio frequency sensing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110032481.0A CN102622641B (en) | 2011-01-30 | 2011-01-30 | A kind of passive radio frequency sensing device |
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| CN102622641A true CN102622641A (en) | 2012-08-01 |
| CN102622641B CN102622641B (en) | 2015-07-29 |
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| CN104281869A (en) * | 2014-10-17 | 2015-01-14 | 奥星制药设备（石家庄）有限公司 | Wireless temperature electronic tag based on radio frequency technology |
| CN106203587A (en) * | 2016-06-30 | 2016-12-07 | 上海哲山科技股份有限公司 | The processing method of smart card and smart card |
| CN106326968A (en) * | 2015-06-18 | 2017-01-11 | 纬创资通股份有限公司 | Radio frequency module and related management system |
| CN107110673A (en) * | 2014-11-04 | 2017-08-29 | 通用电气公司 | Disposable multivariable sensing device further with the sensor based on radio frequency |
| CN109632831A (en) * | 2019-01-31 | 2019-04-16 | 天津大学 | Microstrip antenna sensing system, detection and the preparation method of square spiral structure |
| CN112578093A (en) * | 2020-11-24 | 2021-03-30 | 陕西工业职业技术学院 | WSN-based water quality monitoring system |
| CN117416961A (en) * | 2023-12-15 | 2024-01-19 | 深圳市埃伯瑞科技有限公司 | Two-dimensional transition metal carbide flaky dispersion, energy collection antenna and preparation method and application thereof |
| WO2024021689A1 (en) * | 2022-07-27 | 2024-02-01 | 青岛海尔电冰箱有限公司 | Method for measuring degree of freshness of breast milk, refrigerating device, and storage medium |
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| CN117416961A (en) * | 2023-12-15 | 2024-01-19 | 深圳市埃伯瑞科技有限公司 | Two-dimensional transition metal carbide flaky dispersion, energy collection antenna and preparation method and application thereof |
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