CN111738380A - Passive RFID temperature measurement label - Google Patents
Passive RFID temperature measurement label Download PDFInfo
- Publication number
- CN111738380A CN111738380A CN202010422623.3A CN202010422623A CN111738380A CN 111738380 A CN111738380 A CN 111738380A CN 202010422623 A CN202010422623 A CN 202010422623A CN 111738380 A CN111738380 A CN 111738380A
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- China
- Prior art keywords
- passive rfid
- coaxial line
- matching circuit
- temperature measurement
- passive
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a passive RFID temperature measurement tag which comprises a passive temperature data collector, a coaxial line and an ultrahigh frequency UHF small antenna, wherein the passive temperature data collector comprises a shell, an LC matching circuit and a passive RFID temperature measurement chip, the LC matching circuit and the passive RFID temperature measurement chip are both arranged in the shell, the passive RFID temperature measurement chip is electrically connected to the LC matching circuit, the LC matching circuit is provided with a port for being electrically connected with the coaxial line, the side wall of the shell is provided with a through hole for enabling the end part of the coaxial line to enter the shell, one end of the coaxial line is electrically connected to the LC matching circuit through the through hole, the other end of the coaxial line is electrically connected to the ultrahigh frequency UHF small antenna, the ultrahigh frequency UHF small antenna.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to a passive RFID temperature measurement tag, and belongs to the field of temperature measurement tags.
[ background of the invention ]
Along with the development of the RFID technology and the appearance of the temperature measurement chip, the temperature measurement tag is widely demanded due to the advantages of passive and wireless, but in some special environments, the traditional temperature measurement tag with the temperature measurement chip and the tag antenna integrated and directly connected cannot realize the function of accurate temperature measurement or realize remote communication. For example:
human and animal temperature monitoring
The traditional thermometer and infrared thermometer testing mode for severe patients or newborn animals is difficult to realize real-time temperature monitoring, and the traditional temperature measuring label can only test the temperature of the body surface of a human body or the body surface of the livestock, but not the temperature of the armpit of the human body or the cochlea of the livestock which is most close to the actual body temperature, so that the difference between the tested body temperature and the actual body temperature is large, and the temperature is easily influenced by the surrounding environment, so that the disease symptoms cannot be found in time.
Narrow gap ambient temperature monitoring
In many mills or computer lab, because equipment is put closely, lead to near temperature detection point space narrow or be covered with metal parts, to traditional temperature measurement label, narrow space read write line antenna is put the difficulty, is unfavorable for reading of data, and metal parts on every side influence the performance of label, hardly realizes remote communication.
Metal containment ambient temperature monitoring
In an electric power or industrial system, a chassis or a cabinet body has a shielding effect on electromagnetic waves due to a metal closed environment, and transmission of wireless signals is obstructed. The traditional temperature measurement label scheme is that a temperature measurement label and a reader-writer are placed in the same case or cabinet body to realize temperature detection of key positions, and has the defects of high cost, need of one cabinet body matched with a reader-writer antenna and difficulty in realizing large-scale temperature monitoring and management; in addition, the electromagnetic environment in the case is complex, and the performance of the tag and the performance of the reader-writer antenna are affected.
Liquid internal temperature monitoring
In some biological or industrial laboratories, the RFID tag is required to monitor the temperature of the liquid in real time, but the liquid has a large dielectric constant and absorbs electromagnetic waves, so that the performance of the conventional tag is poor and it is difficult to realize long-distance communication.
[ summary of the invention ]
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a passive RFID temperature measurement tag capable of measuring temperature remotely.
The technical scheme adopted by the invention is as follows:
the utility model provides a passive RFID temperature measurement label, including passive temperature data collector, coaxial line and the little antenna of hyperfrequency UHF electricity, passive temperature data collector includes the casing, LC matching circuit and passive RFID temperature measurement chip all set up in the casing, passive RFID temperature measurement chip electricity is connected to LC matching circuit, be provided with the port that is used for being connected with the coaxial line electricity on the LC matching circuit, set up on the casing lateral wall and supply the coaxial line tip to get into the inside through-hole of casing, the one end of coaxial line is connected to LC matching circuit through the through-hole electricity, the other end electricity is connected to the little antenna of hyperfrequency UHF electricity, the little antenna of hyperfrequency electricity.
The length of the coaxial line is not more than 50 cm.
The LC matching circuit comprises a PCB, a chip capacitor and a chip inductor, wherein the chip capacitor and the chip inductor are mounted on the PCB in a 0201 packaging mode.
The shell comprises a plurality of split bodies which are spliced with each other, the splicing positions of adjacent split bodies are sealed through epoxy resin thermosetting adhesive, and the adjacent split bodies are fixedly connected through the epoxy resin thermosetting adhesive.
The utility model provides a passive RFID temperature measurement label, including passive temperature data collection station, ultrahigh frequency UHF antenna and many coaxial lines, passive temperature data collection station includes the casing, LC matching circuit and passive RFID temperature measurement chip all set up in the casing, passive RFID temperature measurement chip electricity is connected to LC matching circuit, all coaxial lines connect gradually and form coaxial group, be provided with on the LC matching circuit and be used for the port of being connected with coaxial group electricity, set up on the casing lateral wall and supply the coaxial group tip to get into the inside through-hole of casing, the one end of coaxial group is connected to LC matching circuit through the through-hole electricity, ultrahigh frequency UHF antenna electricity is connected to the other end of coaxial group, ultrahigh frequency UHF antenna is located outside the casing.
The length of the coaxial line group is not more than 5 m.
The end part of the coaxial line is provided with a switching port, and adjacent coaxial lines are electrically connected through the switching port.
The LC matching circuit comprises a PCB, a chip capacitor and a chip inductor, wherein the chip capacitor and the chip inductor are mounted on the PCB in a 0201 packaging mode.
The shell comprises a plurality of split bodies which are spliced with each other, the splicing positions of adjacent split bodies are sealed through epoxy resin thermosetting adhesive, and the adjacent split bodies are fixedly connected through the epoxy resin thermosetting adhesive.
Compared with the prior art, the invention has the following beneficial effects:
the invention has the beneficial effects that:
1. the passive temperature data collector is connected with the coaxial line instead of being directly connected with the antenna, so that the coaxial line can increase the distance between the passive RFID temperature measuring chip and the antenna, and the antenna can be far away from a special environment through the coaxial line when the passive temperature data collector is in the special environment, so that data can be transmitted in a stable environment, the activity and arrangement range of the antenna is enlarged, and the passive temperature data collector is very beneficial to data transmission;
2. the shell protects the LC matching circuit and the passive RFID temperature measuring chip, and effectively shields the shell under the condition of using metal materials, so that the interference of special environment on the working process of the LC matching circuit and the passive RFID temperature measuring chip is reduced;
3. the impedance between the passive RFID temperature measuring chip and the coaxial line is matched through the LC matching circuit, so that the transmission efficiency of the passive RFID temperature measuring chip to an external antenna is effectively improved;
4. the antenna and the passive RFID temperature measuring chip can be connected or blocked by using the coaxial line groups on some confidential occasions through dismounting and mounting of the coaxial lines, so that monitoring of the antenna or physical isolation confidentiality is realized;
5. the antenna can directly transmit the temperature data measured by the passive RFID temperature measurement chip, the temperature of an object is reflected in real time, and additional algorithm software is not needed for correction and conversion.
Other features and advantages of the present invention will be disclosed in more detail in the following detailed description of the invention and the accompanying drawings.
[ description of the drawings ]
The invention is further described below with reference to the accompanying drawings:
fig. 1 is a schematic front view of a passive RFID temperature measurement tag according to embodiment 1 of the present invention;
fig. 2 is a schematic front view of a passive RFID temperature measurement tag according to embodiment 2 of the present invention;
fig. 3 is a schematic cross-sectional structural diagram of a passive temperature data collector in embodiments 1 and 2 of the present invention.
[ detailed description ] embodiments
The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
In the following description, the appearances of the indicating orientation or positional relationship such as the terms "inner", "outer", "upper", "lower", "left", "right", etc. are only for convenience in describing the embodiments and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
Example 1:
referring to fig. 1 and 3, the passive RFID temperature measurement tag provided in this embodiment includes a passive temperature data collector 1, a coaxial line 2, and an ultra high frequency UHF small antenna 31, where the passive temperature data collector 1 is electrically connected to one end of the coaxial line 2, and the ultra high frequency UHF small antenna 31 is electrically connected to the other end of the coaxial line 2.
The passive temperature data collector 1 can be placed in a complex environment to measure the temperature of an object and transmit the measured temperature data to the UHF electrically small antenna 31 through the coaxial line 2. Due to the existence of the coaxial line 2, a larger distance can be drawn between the passive temperature data collector 1 and the ultra-high frequency UHF small antenna 31, so that the ultra-high frequency UHF small antenna 31 can transmit data to the outside in a stable environment, and the stability of data transmission of the ultra-high frequency UHF small antenna 31 is improved. The coaxial line 2 has good shielding effect, is less influenced by special environments such as liquid and the like, has good flexibility and can be bent according to application environments. The UHF electrically small antenna 31 is small in size, approximately in the shape of a spiral, similar to the shape of a spring, and its diameter and length dimensions are much smaller than 1/4 for the UHF wavelength, approximately one tenth of the UHF wavelength, and between 0.1m and 0.1dm, and the performance of the UHF electrically small antenna 31 is affected by the length of the coaxial line 2.
The length of the coaxial line 2 between the UHF electrically small antenna 31 and the passive temperature data collector 1 is fixed and can not be adjusted, so that the number of the coaxial lines 2 is only one, and the length of the coaxial lines is not more than 50cm, thereby ensuring the transmission performance of the UHF electrically small antenna 31.
In this embodiment, the passive temperature data collector 1 includes a housing 11, an LC matching circuit 13, and a passive RFID temperature measurement chip 12. A corresponding UHF electrically small antenna 31 is located outside the housing 11.
The passive RFID temperature measurement chip 12 is electrically connected to the LC matching circuit 13, a port for electrically connecting the coaxial line 2 is arranged on the LC matching circuit 13, and the end part of the coaxial line 2 is electrically connected to the port, so that the coaxial line 2 and the passive temperature data collector 1 are electrically connected.
Based on the characteristics of the passive RFID temperature chip 12 itself, its own impedance changes as the received signal strength changes. The farthest acquisition distance R of the passive RFID temperature measurement chip 12 is determined by the transmission coefficient tau, and tau is determined by the matching degree of the passive RFID temperature measurement chip 12, the coaxial line 2 and the UHF electrically small antenna 31.
The impedance of the passive RFID temperature measurement chip 12 is adjusted by the LC matching circuit 13, so as to match the impedance of the UHF electrical small antenna 31, for example, the impedance of the UHF electrical small antenna 31 in this embodiment is 50 Ω, and the impedance of the passive RFID temperature measurement chip 12 is adjusted and matched to be near 50 Ω by the LC matching circuit 13, so that the transmission efficiency between the passive RFID temperature measurement chip 12 and the UHF electrical small antenna 31 is increased to over 75%. Under the condition that the LC matching circuit 13 is not adopted, standing waves are formed between the passive RFID temperature measuring chip 12 and the UHF electrically small antenna 31 due to impedance mismatching, power loss is large, and meanwhile the reading distance of the passive RFID temperature measuring chip 12 is influenced.
In addition, the passive RFID temperature measurement chip 12 directly measures temperature signal data and transmits the temperature signal data to the UHF electrically small antenna 31, algorithm correction and conversion are not additionally needed in the middle, and the effect of simplifying a circuit structure is obvious.
The side wall of the shell 11 is provided with a through hole for the end of the coaxial line 2 to enter the shell 11, so that the end of the coaxial line 2 enters the shell 11 and is electrically connected with the LC matching circuit 13, and the shell 11 protects the exposed cable at the end of the coaxial line 2.
The LC matching circuit 13 comprises a PCB, a chip capacitor and a chip inductor, wherein the chip capacitor and the chip inductor are mounted on the PCB in a 0201 packaging mode, so that a circuit on the PCB is in a long and thin strip shape, and the components on the PCB are closely arranged to reduce the design size of the PCB. Taking this embodiment as an example, the width, length and thickness of the PCB board can be respectively reduced to 4mm, 17mm and 0.6mm, and the size of the housing 11 can be correspondingly reduced, so that the passive temperature data collector 1 can adapt to a narrow environment. The PCB adopts a coplanar waveguide transmission line structure inside, has 1dB less transmission loss than a microstrip transmission line under the same size, and can be better matched with the passive RFID temperature measurement chip 12.
The housing 11 in this embodiment includes a plurality of separate bodies, and the separate bodies are spliced together to form the entire housing 11. The splicing positions of the adjacent split bodies are sealed through epoxy resin thermosetting adhesive, and the adjacent split bodies are fixedly connected after the epoxy resin thermosetting adhesive is cured. The sealing performance of the split connection is enhanced, so that the passive temperature data collector 1 is adaptive to the liquid environment.
Example 2:
referring to fig. 2 and 3, the embodiment provides a passive RFID temperature measurement tag, which includes a passive temperature data collector 1, an ultra high frequency UHF antenna 32, and a plurality of coaxial lines 2. All the coaxial lines 2 are sequentially connected to form a coaxial line group, the passive temperature data collector 1 is electrically connected to one end of the coaxial line group, and the other end of the coaxial line group is electrically connected to the Ultra High Frequency (UHF) antenna 32.
The passive temperature data collector 1 can be placed in a complex environment to measure the temperature of an object and transmit the measured temperature data to the UHF antenna 32 via the coaxial line group. Due to the existence of the coaxial line group, a larger distance can be drawn between the passive temperature data collector 1 and the ultrahigh frequency UHF antenna 32, so that the ultrahigh frequency UHF antenna 32 can transmit data to the outside in a stable environment, and the data transmission stability of the ultrahigh frequency UHF antenna 32 is improved. The UHF antenna 32 has a large area and is a rectangular plate, and the length and width dimensions of the UHF antenna are equivalent to 1/4 of UHF wavelength and are between 0.25 and 0.25 dm.
In this embodiment, the length of the whole coaxial line set can be controlled by adjusting the number and length of the coaxial lines 2, so that the length between the passive temperature data collector 1 and the UHF antenna 32 can be adjusted. But considering the loss of the coaxial line group, the length of the coaxial line group does not exceed 5 m.
The coaxial line 2 has good shielding effect, is less influenced by special environments such as liquid and the like, has good flexibility and can be bent according to application environments.
The number of the coaxial lines 2 in this embodiment is two, and the end portions of the two coaxial lines 2 are provided with the adapter ports 21, so that the two coaxial lines 2 are electrically connected through the connection between the two adapter ports 21. The passive temperature data collector 1 can transmit data to the ultrahigh frequency UHF antenna 32 under the connection state of the corresponding two coaxial lines 2, and the passive temperature data collector 1 and the ultrahigh frequency UHF antenna 32 can be physically disconnected after the two coaxial lines 2 are separated, so that the passive RFID temperature measurement tag can be suitable for the use requirements of some confidential environments.
In this embodiment, the passive temperature data collector 1 includes a housing 11, an LC matching circuit 13, and a passive RFID temperature measurement chip 12. A corresponding UHF antenna 32 is located outside the housing 11.
The passive RFID temperature measurement chip 12 is electrically connected to the LC matching circuit 13, a port for electrically connecting with a coaxial line set is arranged on the LC matching circuit 13, and the end of the coaxial line set is electrically connected to the port, so that the coaxial line set is electrically connected with the passive temperature data collector 1.
The impedance of the passive RFID temperature measurement chip 12 is adjusted by the LC matching circuit 13, so as to match the impedance of the UHF antenna 32, for example, the impedance of the UHF antenna 32 in this embodiment is 50 Ω, and the impedance of the passive RFID temperature measurement chip 12 is adjusted and matched to be near 50 Ω by the LC matching circuit 13, so that the transmission efficiency between the passive RFID temperature measurement chip 12 and the UHF antenna 32 is increased to more than 75%.
In addition, the passive RFID temperature measurement chip 12 directly measures temperature signal data and transmits the temperature signal data to the ultrahigh frequency UHF antenna 32, algorithm correction and conversion are not additionally needed in the middle, and the effect of simplifying a circuit structure is obvious.
The sidewall of the housing 11 is provided with a through hole for the end of the coaxial line set to enter the interior of the housing 11, so that the end of the coaxial line set enters the housing 11 and is electrically connected with the LC matching circuit 13, and the housing 11 protects the exposed cable at the end of the coaxial line set.
The housing 11 in this embodiment includes a plurality of separate bodies, and the separate bodies are spliced together to form the entire housing 11. The splicing positions of the adjacent split bodies are sealed through epoxy resin thermosetting adhesive, and the adjacent split bodies are fixedly connected after the epoxy resin thermosetting adhesive is cured. The sealing performance of the split connection is enhanced, so that the passive temperature data collector 1 is adaptive to the liquid environment.
While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in many different forms without departing from the spirit and scope of the invention as set forth in the following claims. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (9)
1. A passive RFID temperature measurement label is characterized in that: including passive temperature data collection station, coaxial line and the little antenna of hyperfrequency UHF electricity, passive temperature data collection station includes the casing, LC matching circuit and passive RFID temperature measurement chip all set up in the casing, passive RFID temperature measurement chip electricity is connected to LC matching circuit, be provided with the port that is used for being connected with the coaxial line electricity on the LC matching circuit, set up on the casing lateral wall and supply the coaxial line tip to get into the inside through-hole of casing, the one end of coaxial line is connected to LC matching circuit through the through-hole electricity, the other end electricity is connected to the little antenna of hyperfrequency UHF electricity, the little antenna of hyperfrequency electricity is located.
2. The passive RFID thermometric tag of claim 1, wherein: the length of the coaxial line is not more than 50 cm.
3. The passive RFID thermometric tag of claim 2, wherein: the LC matching circuit comprises a PCB, a chip capacitor and a chip inductor, wherein the chip capacitor and the chip inductor are mounted on the PCB in a 0201 packaging mode.
4. The passive RFID thermometric tag of claim 3, wherein: the shell comprises a plurality of split bodies, the split bodies are spliced with one another, the splicing positions of adjacent split bodies are sealed through epoxy resin thermosetting adhesive, and the adjacent split bodies are fixedly connected through the epoxy resin thermosetting adhesive.
5. A passive RFID temperature measurement label is characterized in that: including passive temperature data collection station, hyperfrequency UHF antenna and many coaxial lines, passive temperature data collection station includes the casing, LC matching circuit and passive RFID temperature measurement chip all set up in the casing, passive RFID temperature measurement chip electricity is connected to LC matching circuit, all coaxial lines connect gradually and form coaxial line group, be provided with the port that is used for being connected with coaxial line group electricity on the LC matching circuit, set up on the casing lateral wall and supply coaxial line group tip to get into the inside through-hole of casing, the one end of coaxial line group is connected to LC matching circuit through-hole electricity, hyperfrequency UHF antenna electricity is connected to the other end of coaxial line group, hyperfrequency UHF antenna is located outside the casing.
6. The passive RFID thermometric tag of claim 5, wherein: the length of the coaxial line group is not more than 5 m.
7. The passive RFID thermometric tag of claim 6, wherein: the end part of the coaxial line is provided with a switching port, and the adjacent coaxial lines are electrically connected through the switching port.
8. The passive RFID thermometric tag of claim 7, wherein: the LC matching circuit comprises a PCB, a chip capacitor and a chip inductor, wherein the chip capacitor and the chip inductor are mounted on the PCB in a 0201 packaging mode.
9. The passive RFID thermometric tag of claim 8, wherein: the shell comprises a plurality of split bodies, the split bodies are spliced with one another, the splicing positions of adjacent split bodies are sealed through epoxy resin thermosetting adhesive, and the adjacent split bodies are fixedly connected through the epoxy resin thermosetting adhesive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010422623.3A CN111738380A (en) | 2020-05-19 | 2020-05-19 | Passive RFID temperature measurement label |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010422623.3A CN111738380A (en) | 2020-05-19 | 2020-05-19 | Passive RFID temperature measurement label |
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| CN111738380A true CN111738380A (en) | 2020-10-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010422623.3A Pending CN111738380A (en) | 2020-05-19 | 2020-05-19 | Passive RFID temperature measurement label |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080259995A1 (en) * | 2007-04-23 | 2008-10-23 | Miele & Cie. Kg | Temperature measuring probe, in particular for a household appliance |
| CN205748708U (en) * | 2016-06-01 | 2016-11-30 | 苏文电能科技有限公司 | A kind of SAW temperature sensor of replaceable antenna |
| WO2017050307A1 (en) * | 2015-09-23 | 2017-03-30 | H. HEINZ MEßWIDERSTÄNDE GMBH | Temperature measuring probe |
| CN107926090A (en) * | 2015-08-19 | 2018-04-17 | Bsh家用电器有限公司 | DIE Temperature probe, microwave cooking device and system |
-
2020
- 2020-05-19 CN CN202010422623.3A patent/CN111738380A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080259995A1 (en) * | 2007-04-23 | 2008-10-23 | Miele & Cie. Kg | Temperature measuring probe, in particular for a household appliance |
| CN107926090A (en) * | 2015-08-19 | 2018-04-17 | Bsh家用电器有限公司 | DIE Temperature probe, microwave cooking device and system |
| WO2017050307A1 (en) * | 2015-09-23 | 2017-03-30 | H. HEINZ MEßWIDERSTÄNDE GMBH | Temperature measuring probe |
| CN205748708U (en) * | 2016-06-01 | 2016-11-30 | 苏文电能科技有限公司 | A kind of SAW temperature sensor of replaceable antenna |
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Application publication date: 20201002 |