CN105318892A - A railway wheel sensor signal nonpolarity receiving and processing circuit and an integrated chip - Google Patents

A railway wheel sensor signal nonpolarity receiving and processing circuit and an integrated chip Download PDF

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Publication number
CN105318892A
CN105318892A CN201510809401.6A CN201510809401A CN105318892A CN 105318892 A CN105318892 A CN 105318892A CN 201510809401 A CN201510809401 A CN 201510809401A CN 105318892 A CN105318892 A CN 105318892A
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CN
China
Prior art keywords
wheel sensor
circuit
unit circuit
sensor signal
amplifying unit
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CN201510809401.6A
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Chinese (zh)
Inventor
段文彬
胡冲
熊勇
刘艇
王良前
陈世炜
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重庆微标科技股份有限公司
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Priority to CN201510809401.6A priority Critical patent/CN105318892A/en
Publication of CN105318892A publication Critical patent/CN105318892A/en

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Abstract

The invention provides a railway wheel sensor signal nonpolarity receiving and processing circuit and an integrated chip and belongs to the technical field of railway signal processing. The railway wheel sensor signal nonpolarity receiving and processing circuit comprises a first filtering unit circuit, a first amplification unit circuit and a second amplification unit circuit. Input ends of the first filtering unit circuit are connected to the two ends of a wheel sensor coil and are used for input of wheel sensor signals; the first filtering unit circuit filters peak noise in the wheel sensor signals and outputs the wheel sensor signals to the first amplification unit circuit via an output end; the first amplification unit circuit performs differential amplification treatment on the wheel sensor signals obtained after primary filtering and outputs the wheel sensor signals; the second amplification unit circuit is connected to the first amplification unit circuit and performs same-phase amplification on the wheel sensor signals obtained after differential amplification and outputs the wheel sensor signals. According to the invention, the interference to effective signals by interference noise is effectively prevented and the reliability and the collection accuracy of vehicle judging and axle counting are improved.

Description

A kind of nonpolarity receiving processing circuit of railway wheel sensor signal and integrated chip
Technical field
The present invention relates to railway signal processing technology field, particularly relate to the nonpolarity receiving processing circuit of a kind of railway wheel sensor signal and integrated chip.
Background technology
In railway transport administration process, extensive employing wheel detector coordinates radio frequency discrimination RFID equipment to sentence a meter shaft to operating train, what on current railway, wheel detector great majority adopted is passive wheel sensor, the inductive coil of the passive wheel sensor internal of both sides, limit is in-orbit installed in train wheel cutting in advancing, generate the electric field of change according to the magnetic field of electromagnetic induction principle alternation, post processing electric circuit processes the induced voltage produced and comprehensively waits operation to complete meter shaft in conjunction with software algorithm to sentence a function.The problem adopting the scheme of passive wheel sensor maximum is that it is very responsive to changes of magnetic field, easily by external interference.The various interference source in rail limit is as electric power network, communication line, the operation of rail limit etc., more may there is the noise signal up to hundreds of millivolts in the vibrations produced when especially car crossed by train and the electric discharge of contact electrical network, cause axis-counting device to occur the situation of multiaxis, axle or erroneous judgement less.
Because wheel sensor signal anti-interference is poor, when low speed crosses car (below speed of a motor vehicle 5KM), useful signal amplitude is inherently limited, is therefore easy to be submerged in noise signal, cannot accurately sentence a meter shaft when causing low speed to cross car at all.The method generally adopted at present increases the methods such as wheel detector cable shielding layer, hardware circuit signal condition, adjustment front-end gain.These method processing signals are limited in one's ability, cannot change flexibly according to the speed of a motor vehicle, use scenes must be fixed, speed of a motor vehicle decision errors large and can not take into account the factors such as wheel detector wear and aging, cause system stability to ensure, maintenance trouble.
Therefore, how to solve the interference of interference noise to useful signal, accurately judge wheel detector central point, a meter shaft reliability is sentenced in raising and acquisition precision has just become the art to need the problem solved.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide the nonpolarity receiving processing circuit of a kind of railway wheel sensor signal and integrated chip, for solving the interference of interference noise to useful signal, thus accurately judge wheel detector central point, to improve the problem sentencing a meter shaft reliability and acquisition precision.
For achieving the above object and other relevant objects, the invention provides following technical scheme:
Scheme one
The nonpolarity receiving circuit of a kind of railway wheel sensor signal, comprise: the first filter unit circuit, input end is connected to wheel detector coil two ends, access wheel sensor signal, and export the first amplifying unit circuit to through output terminal after filtering is carried out to the spike noise in wheel sensor signal; First amplifying unit circuit, is exported after through first time, filtered wheel sensor signal carries out differential amplification process; Second amplifying unit circuit, connects described first amplifying unit circuit, exports wheel sensor signal after carrying out homophase amplification to the wheel sensor signal after differential amplification.
Preferably, the line between wheel detector coil two ends and the first filter unit circuit input end is also connected with the first filter unit circuit described in a pair and the input protection element circuit of overvoltage and/or overcurrent protection is provided.
Preferably, described first amplifying unit circuit is a differential amplifier circuit.
Scheme two
The nonpolarity receiving circuit of a kind of railway wheel sensor signal, comprise: the first filter unit circuit, input end is connected to wheel detector coil two ends, access wheel sensor signal, and export the first amplifying unit circuit to through output terminal after filtering is carried out to the spike noise in wheel sensor signal; First amplifying unit circuit, is exported after through first time, filtered wheel sensor signal carries out differential amplification process; Second filter unit circuit, connects described first amplifying unit circuit, is exported after carrying out low-pass filtering to the wheel sensor signal after differential amplification; Second amplifying unit circuit, connects described second filter unit circuit, after carrying out homophase amplification through the filtered wheel sensor signal of second time, export wheel sensor signal.
Preferably, the line between wheel detector coil two ends and the first filter unit circuit input end is also connected with the first filter unit circuit described in a pair and the input protection element circuit of overvoltage and/or overcurrent protection is provided.
Preferably, described first amplifying unit circuit is a differential amplifier circuit.
Preferably, described second filter unit circuit is a low-pass filter circuit.
Scheme three
A kind of integrated chip, comprises arbitrary described nonpolarity receiving circuit of railway wheel sensor signal in such scheme one.
Scheme four
A kind of integrated chip, comprises arbitrary described nonpolarity receiving circuit of railway wheel sensor signal in such scheme two.
Hinge structure, the present invention at least has the following advantages:
The present invention is directed to the problems referred to above that prior art exists, wheel sensor signal is effectively processed, solve interference noise to the interference of useful signal, for the process of follow-up signal provides guarantee;
In addition, just can ignore with the present invention and need to ensure that positive and negative electrode connects correct problem when connecting wheel detector, the present invention is had, and use is simple, utilization is flexible, work efficiency high.
Accompanying drawing explanation
Fig. 1 is shown as a kind of embodiment schematic diagram of the nonpolarity receiving circuit of a kind of railway wheel sensor of the present invention signal.
Fig. 2 is shown as a kind of embodiment circuit diagram of the nonpolarity receiving circuit of railway wheel sensor signal in Fig. 1.
Fig. 3 is shown as a kind of preferred implementation schematic diagram of the nonpolarity receiving circuit of railway wheel sensor signal in Fig. 1.
Fig. 4 is shown as a kind of embodiment circuit diagram of the nonpolarity receiving circuit of railway wheel sensor signal in Fig. 3.
Fig. 5 is shown as another embodiment schematic diagram of the nonpolarity receiving circuit of a kind of railway wheel sensor of the present invention signal.
Fig. 6 is shown as a kind of embodiment circuit diagram of the nonpolarity receiving circuit of railway wheel sensor signal in Fig. 5.
Fig. 7 is shown as a kind of preferred implementation schematic diagram of the nonpolarity receiving circuit of railway wheel sensor signal in Fig. 5.
Fig. 8 is shown as a kind of embodiment circuit diagram of the nonpolarity receiving circuit of railway wheel sensor signal in Fig. 7.
Drawing reference numeral explanation
The nonpolarity receiving circuit of 100,100 ' railway wheel sensor signal
110 first filter unit circuit
120 first amplifying unit circuit
130 second amplifying unit circuit
140 input protection element circuits
150 second filter unit circuit
Embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this instructions can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this instructions also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.It should be noted that, when not conflicting, the feature in following examples and embodiment can combine mutually.
It should be noted that, the diagram provided in following examples only illustrates basic conception of the present invention in a schematic way, then only the assembly relevant with the present invention is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
Embodiment 1
Refer to Fig. 1, the invention provides the schematic diagram of the nonpolarity receiving circuit of a kind of railway wheel sensor signal, as shown in the figure, described railway wheel sensor signal is nonpolarity, and receiving circuit 100 comprises the first filter unit circuit 110, first amplifying unit circuit 120 and the second amplifying unit circuit 130, wherein, the input end of the first filter unit circuit 110 is connected to wheel detector coil two ends, be applicable to access wheel sensor signal, and export the first amplifying unit circuit 120 to through output terminal after filtering is carried out to the spike noise in wheel sensor signal; First amplifying unit circuit 120 is applicable to be exported after through first time, filtered wheel sensor signal carries out differential amplification process; Second amplifying unit circuit 130 connects described first amplifying unit circuit 120, exports wheel sensor signal after being applicable to carry out homophase amplification to the wheel sensor signal after differential amplification.
By the nonpolarity receiving circuit 100 of the above-mentioned railway wheel sensor signal provided, the wheel sensor signal that wheel detector exports can be carried out receiving and by the process of the first filter unit circuit 110, first amplifying unit circuit 120 and the second amplifying unit circuit 130, with the undesired signal in filtering wheel sensor signal, export after obtaining effective wheel sensor signal, carry out digital processing for follow-up.Directly filtering process is simply carried out to wheel sensor signal compared to existing technology, and carry out analog signal processing to realize the follow-up meter shaft amount of sentencing work, the present invention can provide more effective wheel sensor signal, and when accessing wheel sensor signal, wheel detector can not be connected polarity, avoid in prior art and must ensure that both positive and negative polarity can not connect anti-situation, thus there is advantages such as using simply, utilization is flexible, work efficiency is high.
In concrete enforcement, the first filter unit circuit 110, for the treatment of the spike noise at wheel detector coil two ends, reduces noise to the interference of useful signal, improves the validity of late-class circuit process.Which kind of filter circuit construction of concrete employing can need to design according to user, the explanation that concrete circuit implementation can vide infra.
In concrete enforcement, first amplifying unit circuit 120 is a differential amplifier circuit, for carrying out differential amplification to the wheel sensor signal of input, to improve input impedance, the wheel sensor signal of input can not polarity, avoiding prior art needs by both positive and negative polarity to carry out the situation of correct wiring when being drawn by wheel sensor signal, the signal after amplification is convenient to the extraction process of late-class circuit to useful signal.
In concrete enforcement, the second amplifying unit circuit 130, for carrying out homophase amplification to useful signal, is beneficial to follow-uply carry out digital processing, simultaneously also for improving load capacity.
Should be appreciated which kind of amplification circuit structure the first amplifying unit circuit 120 and the second amplifying unit circuit 130 specifically adopt can need to design according to user, the explanation that concrete circuit implementation can vide infra.
Further, below by being described in detail the specific implementation of above scheme by a physical circuit embodiment, be beneficial to those skilled in the art and can implement the present invention better.
Refer to Fig. 2, give a kind of embodiment circuit diagram of the nonpolarity receiving circuit of above-mentioned a kind of railway wheel sensor signal, will be described in detail this circuit diagram below.
Particularly, first filter unit circuit 110 is for be made up of a resistance R5 and electric capacity C3, wherein, resistance R5 and electric capacity C3 is connected in parallel, the two ends of resistance R5 are as the input end of the first filter unit circuit 110, be applicable to the coil two ends being connected to wheel detector, the two ends of electric capacity C3, as the output terminal of the first filter unit circuit 110, are applicable to be connected with late-class circuit.
Particularly, first amplifying unit circuit 120 comprises resistance R3, resistance R4, resistance R9, resistance R8, electric capacity C1, electric capacity C5 and operational amplifier U1, wherein, the inverting input of operational amplifier U1 connects the one end of electric capacity C3 in the first filter unit circuit 110 by resistance R3, the in-phase input end of operational amplifier U1 connects the other end of electric capacity C3 in the first filter unit circuit 110 by resistance R8; Simultaneously, the in-phase input end of operational amplifier U1 is by resistance R9 ground connection, and the two ends of resistance R9 are also parallel with an electric capacity C5, the inverting input of operational amplifier U1 is also by the output terminal of resistance R4 concatenation operation amplifier U1, and the two ends of resistance R4 are also parallel with an electric capacity C1.
Particularly, second amplifying unit circuit 130 at least comprises resistance R1, resistance R2, electric capacity C2 and operational amplifier U2, wherein, the in-phase input end of operational amplifier U2 connects the output terminal of operational amplifier U1 in the first amplifying unit circuit 120, the output terminal of operational amplifier U2 is successively by ground connection after resistance R2 and resistance R1, and the output terminal of operational amplifier U2 is also in series with a resistance R6, electric capacity C2 is connected in parallel on the two ends of resistance R2, and the inverting input of operational amplifier U2 is connected between resistance R2 and resistance R1.
In concrete enforcement; as Fig. 3; line between the input end of the first filter unit circuit 110 and the coil of wheel detector can also be arranged an input protection element circuit 140; be applicable to the damage protecting wheel detector post processing electric circuit by the outside large voltage of big current scurried into, improve circuit reliability.As Fig. 4, give a kind of embodiment circuit diagram of described input protection element circuit 140, as shown in the figure, input protection element circuit 140 comprises voltage dependent resistor (VDR) F1, voltage dependent resistor (VDR) F2 and two-way TVS pipe D1 and two-way TVS pipe D2, wherein, voltage dependent resistor (VDR) F1, voltage dependent resistor (VDR) F2 correspondence is connected on the two ends of resistance R5 in the first filter unit circuit 110, on the line between one end that two-way TVS pipe D1 one end is connected to voltage dependent resistor (VDR) F1 and resistance R5, and the other end ground connection of two-way TVS pipe D1; On line between the other end that two-way TVS pipe D2 one end is connected to voltage dependent resistor (VDR) F2 and resistance R5, the other end ground connection of two-way TVS pipe D2.
Embodiment 2
In the present embodiment, as Fig. 5, present invention also offers the another kind of embodiment schematic diagram of the nonpolarity receiving circuit of a kind of railway wheel sensor signal, as shown in the figure, this railway wheel sensor signal is nonpolarity, and receiving circuit 100 ' comprises the first filter unit circuit 110, second filter unit circuit 150, and first amplifying unit circuit 120 and the second amplifying unit circuit 130, wherein, the input end of the first filter unit circuit 110 is connected to wheel detector coil two ends, be applicable to access wheel sensor signal, and export the first amplifying unit circuit 120 to through output terminal after filtering is carried out to the spike noise in wheel sensor signal, first amplifying unit circuit 120 is applicable to be exported after through first time, filtered wheel sensor signal carries out differential amplification process, second filter unit circuit 150 connects described first amplifying unit circuit 120, is exported after being applicable to carry out low-pass filtering to the wheel sensor signal after differential amplification, second amplifying unit circuit 130 connects described second filter unit circuit 150, is applicable to export wheel sensor signal after carrying out homophase amplification through the filtered wheel sensor signal of second time.
With above-described embodiment 1 difference be, in the present embodiment, between the first amplifying unit circuit 120 and the second amplifying unit circuit 130, being also provided with the second filter unit circuit 150, for carrying out low-pass filtering to wheel sensor signal, reducing the high frequency noise amplitude in useful signal further.
Particularly, see Fig. 6, a kind of embodiment circuit diagram of the nonpolarity receiving circuit of railway wheel sensor signal in the present embodiment can be given, will be described in detail this circuit diagram below.
Particularly, first filter unit circuit 110 is for be made up of a resistance R5 and electric capacity C3, wherein, resistance R5 and electric capacity C3 is connected in parallel, the two ends of resistance R5 are as the input end of the first filter unit circuit 110, be applicable to the coil two ends being connected to wheel detector, the two ends of electric capacity C3, as the output terminal of the first filter unit circuit 110, are applicable to be connected with late-class circuit.First filter unit circuit 110, for the treatment of the spike noise at wheel detector coil two ends, reduces noise to the interference of useful signal, improves the validity of late-class circuit process.
Particularly, first amplifying unit circuit 120 comprises resistance R3, resistance R4, resistance R9, resistance R8, electric capacity C1, electric capacity C5 and operational amplifier U1, wherein, the inverting input of operational amplifier U1 connects the one end of electric capacity C3 in the first filter unit circuit 110 by resistance R3, the in-phase input end of operational amplifier U1 connects the other end of electric capacity C3 in the first filter unit circuit 110 by resistance R8; Simultaneously, the in-phase input end of operational amplifier U1 is by resistance R9 ground connection, and the two ends of resistance R9 are also parallel with an electric capacity C5, the inverting input of operational amplifier U1 is also by the output terminal of resistance R4 concatenation operation amplifier U1, and the two ends of resistance R4 are also parallel with an electric capacity C1.First amplifying unit circuit 120 carries out differential amplification for the wheel sensor signal at the module two ends to input, and improve input impedance, the wheel sensor signal not polarity of input, the signal after amplification is convenient to the extraction process of late-class circuit to useful signal.
Particularly, second filter unit circuit 150 comprises resistance R7 and electric capacity C4, a RC low-pass filter circuit is formed by resistance R7 and electric capacity C4, wherein, one end of resistance R7 is as the output terminal inputting operational amplifier U1 in connection first amplifying unit circuit 120, the other end of resistance R7 connects late-class circuit (the second amplifying unit circuit 130) as output, and by electric capacity C4 ground connection.Second filter unit circuit 150, for carrying out low-pass filtering to wheel sensor signal, reduces the high frequency noise amplitude in useful signal further.
Particularly, second amplifying unit circuit 130 at least comprises resistance R1, resistance R2, electric capacity C2 and operational amplifier U2, wherein, the in-phase input end of operational amplifier U2 connects the output terminal of operational amplifier U1 in the first amplifying unit circuit 120, the output terminal of operational amplifier U2 is successively by ground connection after resistance R2 and resistance R1, and the output terminal of operational amplifier U2 is also in series with a resistance R6, electric capacity C2 is connected in parallel on the two ends of resistance R2, and the inverting input of operational amplifier U2 is connected between resistance R2 and resistance R1.Second amplifying unit circuit 130 is for carrying out homophase amplification to useful signal.
In concrete enforcement; as Fig. 7; line between the input end and the coil of wheel detector of the first filter unit circuit 110 can also arrange an input protection element circuit 140; be applicable to the damage protecting wheel detector post processing electric circuit by the outside large voltage of big current scurried into, improve circuit reliability.As Fig. 8, give a kind of embodiment circuit diagram of described input protection element circuit 140, as shown in the figure, input protection element circuit 140 comprises voltage dependent resistor (VDR) F1, voltage dependent resistor (VDR) F2 and two-way TVS pipe D1 and two-way TVS pipe D2, wherein, voltage dependent resistor (VDR) F1, voltage dependent resistor (VDR) F2 correspondence is connected on the two ends of resistance R5 in the first filter unit circuit 110, on the line between one end that two-way TVS pipe D1 one end is connected to voltage dependent resistor (VDR) F1 and resistance R5, and the other end ground connection of two-way TVS pipe D1; On line between the other end that two-way TVS pipe D2 one end is connected to voltage dependent resistor (VDR) F2 and resistance R5, the other end ground connection of two-way TVS pipe D2.
Further, in concrete enforcement, embodiment 1 and the circuit structure implemented in 2 can also be made into integrated circuit, thus form the integrated chip that has the nonpolarity receiving function of railway wheel sensor signal.
In sum, the present invention the present invention is directed to the problems referred to above that prior art exists, especially low speed crosses the processing procedure of car signal, accurate deterministic process situation cannot be carried out by wheel sensor signal, the present invention is by after carrying out corresponding filter amplifying processing to wheel sensor signal, obtain effective wheel sensor signal, realize the accurate judgement to crossing car situation for later use digital processing technology, and then improve the reliability sentencing a meter shaft; Simultaneously the present invention also have use simple, use flexibly, work efficiency high.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.

Claims (9)

1. the nonpolarity receiving circuit of railway wheel sensor signal, is characterized in that, comprising:
First filter unit circuit, input end is connected to wheel detector coil two ends, for access wheel sensor signal, and exports the first amplifying unit circuit to through output terminal after carrying out filtering to the spike noise in wheel sensor signal;
First amplifying unit circuit, is exported after through first time, filtered wheel sensor signal carries out differential amplification process;
Second amplifying unit circuit, connects described first amplifying unit circuit, exports wheel sensor signal after carrying out homophase amplification to the wheel sensor signal after differential amplification.
2. the nonpolarity receiving circuit of railway wheel sensor signal according to claim 1, is characterized in that: the line between wheel detector coil two ends and the first filter unit circuit input end is also connected with the first filter unit circuit described in a pair and provides the input protection element circuit of overvoltage and/or overcurrent protection.
3. the nonpolarity receiving circuit of railway wheel sensor signal according to claim 1, is characterized in that: described first amplifying unit circuit is a differential amplifier circuit.
4. the nonpolarity receiving circuit of railway wheel sensor signal, is characterized in that, comprising:
First filter unit circuit, input end is connected to wheel detector coil two ends, for access wheel sensor signal, and exports the first amplifying unit circuit to through output terminal after carrying out filtering to the spike noise in wheel sensor signal;
First amplifying unit circuit, is exported after through first time, filtered wheel sensor signal carries out differential amplification process;
Second filter unit circuit, connects described first amplifying unit circuit, is exported after carrying out low-pass filtering to the wheel sensor signal after differential amplification;
Second amplifying unit circuit, connects described second filter unit circuit, after carrying out homophase amplification through the filtered wheel sensor signal of second time, export wheel sensor signal.
5. the nonpolarity receiving circuit of railway wheel sensor signal according to claim 4, is characterized in that: the line between wheel detector coil two ends and the first filter unit circuit input end is also connected with the first filter unit circuit described in a pair and provides the input protection element circuit of overvoltage and/or overcurrent protection.
6. the nonpolarity receiving circuit of railway wheel sensor signal according to claim 4, is characterized in that: described first amplifying unit circuit is a differential amplifier circuit.
7. the nonpolarity receiving circuit of railway wheel sensor signal according to claim 4, is characterized in that: described second filter unit circuit is a low-pass filter circuit.
8. an integrated chip, is characterized in that: comprise the nonpolarity receiving circuit of railway wheel sensor signal described in any one of the claims 1-3.
9. an integrated chip, is characterized in that: comprise the nonpolarity receiving circuit of railway wheel sensor signal described in any one of the claims 4-7.
CN201510809401.6A 2015-11-20 2015-11-20 A railway wheel sensor signal nonpolarity receiving and processing circuit and an integrated chip CN105318892A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105966420A (en) * 2016-06-15 2016-09-28 湖南工业大学 Rail wheel sensing device
CN111532309A (en) * 2020-05-06 2020-08-14 北京恒通安泰科技有限公司 Wheel sensor, train detection system, and rail on which train runs

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CN102386987A (en) * 2011-10-24 2012-03-21 哈尔滨工程大学 Underwater wireless voice electromagnetic communication simulating system
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Publication number Priority date Publication date Assignee Title
CN2665712Y (en) * 2003-10-21 2004-12-22 潘晓 Apparatus for detecting plant bioelectricity
CN201127603Y (en) * 2007-12-27 2008-10-08 杭州电子科技大学 Hand-hold electrocardioscanner
US20090205957A1 (en) * 2008-02-19 2009-08-20 Denso Corporation Gas sensor control device
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Publication number Priority date Publication date Assignee Title
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CN111532309A (en) * 2020-05-06 2020-08-14 北京恒通安泰科技有限公司 Wheel sensor, train detection system, and rail on which train runs

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