CN104568058A - Guide wave radar level meter - Google Patents
Guide wave radar level meter Download PDFInfo
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- CN104568058A CN104568058A CN201410849129.XA CN201410849129A CN104568058A CN 104568058 A CN104568058 A CN 104568058A CN 201410849129 A CN201410849129 A CN 201410849129A CN 104568058 A CN104568058 A CN 104568058A
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Abstract
The invention provides a guide wave radar level meter. Power connection between a first main control unit and a second main control unit is realized by use of an isolating DC/DC converter, and the communication connection between the first main control unit and the second main control unit is realized by use of an opto-coupler in an isolation manner; a signal unit is used for emitting a high-frequency pulse signal according to the frequency difference of high-frequency pulse signals adjusted and generated by the second main control unit, and connecting a high-frequency pulse echo signal reflected by a tested object and the emitted high-frequency pulse signal for transmitting to the second main control unit; the second main control unit is used for controlling the signal unit according to setting parameters transmitted by a first main control board, and calculating the distance between the tested object and the surface of the guide wave radar level meter according to the received high-frequency pulse echo signal and the emitted high-frequency pulse signal; the first main control unit is used for controlling the frequency difference of the second main control unit according to the test parameters set by a setting unit and setting parameters set by an upper computer, and receiving the distance of the tested object calculated by the first main control unit; as a result, the anti-interference capability is improved.
Description
Technical field
The present invention relates to automation field, particularly relate to a kind of isolated guided wave radar material level gauge.
Background technology
Radar level gauge system is widely used in the process variable measuring the article comprised in a reservoir, as fill level, temperature, pressure etc.General non-contact measurement method or the contact measuring method being commonly called guided wave radar (GWR) carry out radar level measurement, wherein, non-contact measurement method is to the article electromagnetic radiation signal comprised in a reservoir, and electromagnetic signal to be led this article make it enter in article by transmission line detector by contact measuring method.Transmission line detector is generally arranged vertically from the top-to-bottom of container.Subsequently, this electromagnetic signal is reflected at article surface, and the signal of reflection is comprised in receiver in radar level gauge system or transceiver received.Based on the signal of transmission and the signal of reflection, the distance of article surface can be determined.
But, when generally adopting contact measuring method to measure tested material in the market, usually because great interference is caused to guided wave radar material level gauge in extremely complicated use scene; Such as: under some operating mode, measured object is with the breeze of the electrostatic that disturbs or there is the electrostatic interference of some more difficult discoveries.In this case, the interference that tested material brings enters into by sensor that instrument is just very possible causes the mistake measured and export to instrument, thus has influence on instrument user and automatically control normally.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of guided wave radar material level gauge, for solving in prior art when guided wave radar material level gauge work measurement measured object, because the problem of electrostatic interference that working environment complexity is brought.
For achieving the above object and other relevant objects, the invention provides a kind of guided wave radar material level gauge, comprise control system and main control module, described control system comprises the first main control unit, communication unit, power supply unit and setting unit, and described main control module comprises the second main control unit and signal element; Power supply between described first main control unit with described second main control unit adopts to be isolated DC/DC converter and is connected, and the communication between described first main control unit with described second main control unit adopts light-coupled isolation to be connected;
Described power supply unit, is applicable to direct supply is supplied to described first main control unit, and electric current is different needed for the coupled each unit of described first main control unit, and the electric current controlling power supply unit exports;
Described setting unit, is applicable to the test parameter arranging described first main control unit according to the button that can input;
Described communication unit, the host computer being applicable to be connected with described first main control unit intercoms mutually, transmits described host computer and arranges the parameters of described first main control unit and the test parameter of described setting unit setting;
Described signal element, be applicable to regulate the frequency-splitting of the high-frequency pulse signal generated according to described second main control unit and launch high-frequency pulse signal, and the high-frequency pulse signal gathering high-frequency impulse echoed signal that measured object reflects and transmitting is transferred to described second main control unit;
Described second main control unit, be applicable to the parameters according to described first master control borad transmission and control described signal element, and calculating the distance between measured object to guided wave radar material level gauge surface according to the high-frequency impulse echoed signal of reception and the high-frequency pulse signal of transmitting;
Described first main control unit, the electric current being applicable to control coupled unit exports, also be applicable to arrange according to setting unit parameters that test parameter and described host computer arrange and control the frequency-splitting of described second main control unit, and receive the distance that described first main control unit calculates measured object.
Preferably, described control system also comprises display unit, and wherein, described display unit is connected with the first main control unit;
Described display unit, is applicable to the parameters of test parameter and the described host computer inputted according to described setting unit, shows measured value, duty, the signal waveform of the measured object of described first main control unit feedback.
Preferably, described signal element is signal plate, described signal plate comprises transceiver, be applicable to the frequency-splitting according to described second main control unit control signal plate, and produce two groups of high-frequency pulse signals according to described frequency-splitting, comprising the high-frequency pulse signal launched and the high-frequency pulse signal of reference, the high-frequency pulse signal of described transmitting through Transceiver Transmit to measured object, and by high-frequency impulse echoed signal that described transceivers measured object surface reflection is returned; The high-frequency pulse signal gathering high-frequency impulse echoed signal and reference is sent to described second main control unit.
Preferably, serial communication is adopted between described first main control unit and described second main control unit.
Preferably, the light-coupled isolation of serial communication is adopted to be connected between described first main control unit with described second main control unit.
Preferably, described control system and described main control module have included watchdog unit, and described first main control unit is all connected a watchdog unit with described second main control unit, and described watchdog unit is used for preventing each main control unit to be absorbed in endless loop.
Preferably, described control system and described main control module have included storage unit, described first main control unit is all connected a storage unit with described second main control unit, wherein, described storage unit is band EEPROM (Electrically Erasable Programmable Read Only Memo), is applicable to preserve information after the process of each main control unit.
Preferably, described first main control unit is single-chip microcomputer and/or programmable logic controller (PLC), and described second main control unit is single-chip microcomputer and/or programmable logic controller (PLC).
As mentioned above, a kind of guided wave radar material level gauge of the present invention, has following beneficial effect:
Isolate DC/DC converter between powering with described second main control unit according to described first main control unit to be connected, the conversion efficiency of described isolation DC/DC converter is high, improves the capacity usage ratio of whole design; Light-coupled isolation is adopted to be connected between described first main control unit with the communication of described second main control unit, and employing serial communication, because light-coupled isolation is low-power consumption, and two optocouplers only need be used to connect, greatly reduce the communication power consumption between two described main control units, and between the main control module preventing the interference, particularly low pressure caused because there being the connection of electricity and the control system of high pressure; Communication and power supply supply are kept apart respectively, reduces guided wave radar material level gauge self disturbing factor, improve the antijamming capability of guided wave radar material level gauge.
Accompanying drawing explanation
Fig. 1 is shown as the structural framing figure of a kind of guided wave radar material level gauge that the embodiment of the present invention provides;
Fig. 2 is shown as the detailed construction frame diagram of guided wave radar material level gauge in Fig. 1 that the embodiment of the present invention provides.
Element numbers illustrates:
1, control system, 2, main control module, the 3, first main control unit, the 4, second main control unit, 5, communication unit, 6, power supply unit, 7, setting unit, 8, signal element, 9, display unit, 10, watchdog unit, 11, storage unit.
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.
Refer to Fig. 1 to Fig. 2.It should be noted that, the diagram provided in the present embodiment 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.
As shown in Figure 1, the structural framing figure of a kind of guided wave radar material level gauge provided for the embodiment of the present invention.
In this example, described guided wave radar material level gauge adopts the mode of isolation to design, described control system 1 be responsible for power supply management, show test results, realize controlling the functions such as test according to communication unit parameters; Described main control module 2 controls correlated frequency according to the optimum configurations of control system 2, after high-frequency pulse signal produces, and the high-frequency impulse echoed signal that collection measured object fires back; The distance between corresponding measured object is generated according to collection high-frequency impulse echoed signal and generation high-frequency pulse signal.Effectively can isolate operating mode on the one hand on-the-spot by the impact of electric supply system on main control module, also can isolate operating mode scene on the other hand and by tested material, control system be impacted.
As shown in Figure 2, the detailed construction frame diagram of guided wave radar material level gauge in the Fig. 1 provided for the embodiment of the present invention.Composition graphs 1 and Fig. 2, the guided wave radar material level gauge that the present embodiment provides comprises control system 1 and main control module 2, described control system 1 comprises the first main control unit 3, communication unit 5, power supply unit 6 and setting unit 7, and described main control module 2 comprises the second main control unit 4 and signal element 8; Power supply between described first main control unit 3 with described second main control unit 4 adopts to be isolated DC/DC converter and is connected, and the communication between described first main control unit 3 with described second main control unit 4 adopts light-coupled isolation to be connected;
Wherein, described control system 1 is modules completely isolated in two physical connections with described main control module 2, and the communication between two described modules is connected with for being electrically connected also to separate, and the protection skin of connecting line is anti-tampering isolation; Prevent because voltage is different between two modules, namely the control system 1 of high pressure is disturbed mutually with the control module 2 of low pressure.
Described power supply unit 6, is applicable to direct supply is supplied to described first main control unit 3, and electric current is different needed for the coupled each unit of described first main control unit 3, and the electric current controlling power supply unit exports;
Wherein, described power supply unit 6 at least comprises the power supply that DC voltage is 24V, is achieved the rated voltage of Power convert needed for unit by the first main control unit 3.
Described setting unit 7, is applicable to the test parameter arranging described first main control unit 3 according to the button that can input;
Wherein, described setting unit 7 is the button that can input, and realizes human-computer interaction function by button operation, and can arrange by this button the test parameter that whole guided wave radar material level gauge measures needs, such as measurement range.
Described communication unit 5, the host computer being applicable to be connected with described first main control unit 3 intercoms mutually, transmits described host computer and arranges the parameters of described first main control unit and the test parameter of described setting unit setting;
Wherein, described host computer is the controller be connected with the first main control unit 3, described controller can be computing machine, described controller arranges the setting parameter of guided wave radar material level gauge by communication unit, auxiliary parameter setting unit controls guided wave radar material level gauge and measures, communication between wherein said host computer and described first main control unit 3 is communication unit 5, and described communication unit 5 is preferably HART communication, realizes the setting parameter of guided wave radar material level gauge.
Described signal element 8, be applicable to regulate the frequency-splitting of the high-frequency pulse signal generated according to described second main control unit 4 and launch high-frequency pulse signal, and the high-frequency pulse signal gathering high-frequency impulse echoed signal that measured object reflects and transmitting is transferred to described second main control unit 4;
Described second main control unit 4, be applicable to the parameters according to described first master control borad 3 transmission and control described signal element 8, and calculating the distance between measured object to guided wave radar material level gauge surface according to the high-frequency impulse echoed signal of reception and the high-frequency pulse signal of transmitting;
Described first main control unit 3, the electric current being applicable to control coupled unit exports, also be applicable to arrange according to described setting unit 7 parameters that test parameter and described host computer arrange and control the frequency-splitting of described second main control unit 4, and receive the distance that described first main control unit 3 calculates measured object.
In this example, power isolate DC/DC converter between 4 and be connected according to described first main control unit 3 and described second main control unit, the conversion efficiency of described isolation DC/DC converter is high, improves the capacity usage ratio of whole design; Light-coupled isolation is adopted to be connected between described first main control unit 3 with the communication of described second main control unit 4, and employing serial communication, because light-coupled isolation is low-power consumption, and two optocouplers only need be used to connect, greatly reduce the communication power consumption between two described main control units, and between the main control module 2 preventing the interference, particularly low pressure caused because there being the connection of electricity and the control system 1 of high pressure; Communication and power supply supply are kept apart respectively, reduces guided wave radar material level gauge self disturbing factor, improve the antijamming capability of guided wave radar material level gauge.
Preferably, described control system 1 also comprises display unit 9, and wherein, described display unit 9 is connected with the first main control unit 1;
Described display unit 9, is applicable to the parameters of test parameter and the described host computer inputted according to described setting unit 7, shows measured value, duty, the signal waveform of the measured object of described first master control list 3 yuan feedback.
Particularly, the test parameter that when described display unit 9 is man-machine interaction, display button is arranged, and the parameter that the described host computer showing described communications is arranged can be display screen, display etc.
Preferably, described signal element 8 is signal plate, described signal plate comprises transceiver, be applicable to the frequency-splitting according to described second main control unit 4 control signal plate, and produce two groups of high-frequency pulse signals according to described frequency-splitting, comprising the high-frequency pulse signal launched and the high-frequency pulse signal of reference, the high-frequency pulse signal of described transmitting through Transceiver Transmit to measured object, and by high-frequency impulse echoed signal that described transceivers measured object surface reflection is returned; The high-frequency pulse signal gathering high-frequency impulse echoed signal and reference is sent to described second main control unit 4.
Particularly, described signal plate comprises transceiver, described signal plate produces two groups of high-frequency pulse signals according to the parameter arranged, described second main control unit regulates the frequency-splitting of two groups of high-frequency pulse signals according to the parameter arranged, described frequency-splitting determines high-frequency pulse signal transmission frequency, wherein, one group is used to the high-frequency pulse signal launched, another group is used to the high-frequency pulse signal of reference, the high-frequency pulse signal being used for launching is gone out through described Transceiver Transmit, when the electromagnetic high-frequency pulse signal launched is launched according to frequency, reach measured object, the high-frequency impulse echoed signal that described measured object reflects is through transceiver collection, the second main control unit 4 is sent to carry out processing and calculating the high-frequency impulse echoed signal of collection and the high-frequency pulse signal of reference, distance between the transceiver end obtaining described guided wave radar material level gauge to measured object.
Such as, wherein signal plate can also comprise sensor, emitting antenna and hardware Acquisition Circuit, when the high-frequency pulse signal launched is sent to sensor through emitting antenna, this high-frequency pulse signal sends by described sensor, through launching, the high-frequency impulse echoed signal that the collection of described hardware Acquisition Circuit reflects sends to the second main control unit 4.
Preferably, serial communication is adopted between described first main control unit 3 and described second main control unit 4.
Preferably, the light-coupled isolation of serial communication is adopted to be connected between described first main control unit 3 with described second main control unit 4.
Preferably, described control system 1 has included watchdog unit 10 with described main control module 2, described first main control unit 3 is all connected a watchdog unit with described second main control unit 4, and described watchdog unit 10 is absorbed in endless loop for preventing each main control unit.
Preferably, described control system 1 has included storage unit 11 with described main control module 2, described first main control unit 3 is all connected a storage unit 11 with described second main control unit 4, wherein, described storage unit 11 is band EEPROM (Electrically Erasable Programmable Read Only Memo), is applicable to preserve information after the process of each main control unit.
Preferably, described first main control unit is single-chip microcomputer and/or programmable logic controller (PLC), and described second main control unit is single-chip microcomputer and/or programmable logic controller (PLC).
In sum, 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 (8)
1. a guided wave radar material level gauge, it is characterized in that, comprise control system and main control module, described control system comprises the first main control unit, communication unit, power supply unit and setting unit, and described main control module comprises the second main control unit and signal element; Power supply between described first main control unit with described second main control unit adopts to be isolated DC/DC converter and is connected, and the communication between described first main control unit with described second main control unit adopts light-coupled isolation to be connected;
Described power supply unit, is applicable to direct supply is supplied to described first main control unit, and electric current is different needed for the coupled each unit of described first main control unit, and the electric current controlling power supply unit exports;
Described setting unit, is applicable to the test parameter arranging described first main control unit according to the button that can input;
Described communication unit, the host computer being applicable to be connected with described first main control unit intercoms mutually, transmits described host computer and arranges the parameters of described first main control unit and the test parameter of described setting unit setting;
Described signal element, be applicable to regulate the frequency-splitting of the high-frequency pulse signal generated according to described second main control unit and launch high-frequency pulse signal, and the high-frequency pulse signal gathering high-frequency impulse echoed signal that measured object reflects and transmitting is transferred to described second main control unit;
Described second main control unit, be applicable to the parameters according to described first master control borad transmission and control described signal element, and calculating the distance between measured object to guided wave radar material level gauge surface according to the high-frequency impulse echoed signal of reception and the high-frequency pulse signal of transmitting;
Described first main control unit, the electric current being applicable to control coupled unit exports, also be applicable to arrange according to setting unit parameters that test parameter and described host computer arrange and control the frequency-splitting of described second main control unit, and receive the distance that described first main control unit calculates measured object.
2. guided wave radar material level gauge according to claim 1, is characterized in that, described control system also comprises display unit, and wherein, described display unit is connected with the first main control unit;
Described display unit, is applicable to the parameters of test parameter and the described host computer inputted according to described setting unit, shows measured value, duty, the signal waveform of the measured object of described first main control unit feedback.
3. guided wave radar material level gauge according to claim 1, it is characterized in that, described signal element is signal plate, described signal plate comprises transceiver, described signal plate is applicable to the frequency-splitting according to described second main control unit control signal plate, and produce two groups of high-frequency pulse signals according to described frequency-splitting, wherein said two groups of high-frequency pulse signals comprise the high-frequency pulse signal of transmitting and the high-frequency pulse signal of reference, the high-frequency pulse signal of described transmitting through Transceiver Transmit to measured object, and by high-frequency impulse echoed signal that described transceivers measured object surface reflection is returned, described signal plate is also applicable to the high-frequency pulse signal gathering high-frequency impulse echoed signal and reference to be sent to described second main control unit.
4. guided wave radar material level gauge according to claim 1, is characterized in that, adopts serial communication between described first main control unit and described second main control unit.
5. guided wave radar material level gauge according to claim 4, is characterized in that, adopts the light-coupled isolation of serial communication to be connected between described first main control unit with described second main control unit.
6. guided wave radar material level gauge according to claim 1, it is characterized in that, described control system and described main control module have included watchdog unit, described first main control unit is all connected a watchdog unit with described second main control unit, and described watchdog unit is applicable to prevent each main control unit to be absorbed in endless loop.
7. guided wave radar material level gauge according to claim 1, it is characterized in that, described control system and described main control module have included storage unit, described first main control unit is all connected a storage unit with described second main control unit, wherein, described storage unit is band EEPROM (Electrically Erasable Programmable Read Only Memo), is applicable to preserve information after the process of each main control unit.
8. guided wave radar material level gauge as claimed in any of claims 1 to 7, is characterized in that, described first main control unit is single-chip microcomputer and/or programmable logic controller (PLC), and described second main control unit is single-chip microcomputer and/or programmable logic controller (PLC).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410849129.XA CN104568058A (en) | 2014-12-31 | 2014-12-31 | Guide wave radar level meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410849129.XA CN104568058A (en) | 2014-12-31 | 2014-12-31 | Guide wave radar level meter |
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| CN104568058A true CN104568058A (en) | 2015-04-29 |
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| CN201410849129.XA Pending CN104568058A (en) | 2014-12-31 | 2014-12-31 | Guide wave radar level meter |
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| CN109632046A (en) * | 2017-10-06 | 2019-04-16 | Vega格里沙贝两合公司 | Radar level gauge with the synchronization signal on various boards layer |
| WO2021082031A1 (en) * | 2019-10-30 | 2021-05-06 | 北京锐达仪表有限公司 | Pulse radar level meter for measuring material level in container |
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