CN214748297U - Guided wave radar level meter for adjusting transmitted signal waveform - Google Patents
Guided wave radar level meter for adjusting transmitted signal waveform Download PDFInfo
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- CN214748297U CN214748297U CN202121450752.XU CN202121450752U CN214748297U CN 214748297 U CN214748297 U CN 214748297U CN 202121450752 U CN202121450752 U CN 202121450752U CN 214748297 U CN214748297 U CN 214748297U
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Abstract
The present disclosure provides a guided wave radar level gauge for adjusting a waveform of a transmitted signal, comprising: the microwave signal generation module generates a microwave signal; the waveform adjusting circuit is used for adjusting the waveform of the microwave signal generated by the microwave signal generating module; the waveform adjusting circuit comprises a signal amplitude adjusting circuit and/or a signal width adjusting circuit, the signal amplitude adjusting circuit adjusts the signal amplitude of the microwave signal generated by the microwave signal generating module based on the transmission distance of the microwave signal, and the signal width adjusting circuit adjusts the signal width of the microwave signal generated by the microwave signal generating module based on the transmission distance of the microwave signal.
Description
Technical Field
The present disclosure belongs to the technical field of radar level gauges, and particularly relates to a guided wave radar level gauge for adjusting a transmitted signal waveform.
Background
The loss of accuracy of prior art radar level gauges, such as radar level gauges, mainly results from distortions of the waveform of the microwave signal.
The waveform distortion of the microwave signal is mainly caused by the signal amplitude variation of the microwave signal caused by the variation of the transmission distance of the microwave signal (generally, the signal amplitude of the microwave signal will decrease when the transmission distance of the microwave signal increases), and the attenuation of the high-frequency-domain signal is inconsistent with that of the low-frequency-domain signal caused by the variation of the transmission distance.
The distance calculation is based on the acquisition of correct microwave signal waveforms, and the waveform distortion of the microwave signal waveforms in the transmission process can cause that the correct microwave signal waveforms cannot be recognized well and accurately, so that the measurement precision of the guided wave radar liquid level meter in the prior art is influenced.
SUMMERY OF THE UTILITY MODEL
To address at least one of the above technical problems, the present disclosure provides a guided wave radar level gauge that adjusts a transmitted signal waveform.
The guided wave radar level gauge for adjusting the waveform of the transmitted signal is realized by the following technical scheme.
According to an aspect of the present disclosure, there is provided a radar level gauge comprising:
the microwave signal generation module generates a microwave signal; and the number of the first and second groups,
the waveform adjusting circuit is used for adjusting the waveform of the microwave signal generated by the microwave signal generating module;
the waveform adjusting circuit comprises a signal amplitude adjusting circuit and/or a signal width adjusting circuit, the signal amplitude adjusting circuit adjusts the signal amplitude of the microwave signal generated by the microwave signal generating module based on the transmission distance of the microwave signal, and the signal width adjusting circuit adjusts the signal width of the microwave signal generated by the microwave signal generating module based on the transmission distance of the microwave signal.
The radar level gauge according to at least one embodiment of the present disclosure, further comprises echo signal processing circuitry, which obtains a transmission distance of the microwave signal based on an echo signal corresponding to the received microwave signal.
According to at least one embodiment of the present disclosure, the radar level gauge, the signal amplitude adjustment circuit comprises a voltage adjustment circuit that adjusts the signal amplitude of the microwave signal.
According to the radar level gauge of at least one embodiment of the present disclosure, the voltage adjustment circuit comprises an adjustable voltage source and a voltage monitoring circuit, the adjustable voltage source adjusting an output voltage of the adjustable voltage source based on a monitored voltage of the voltage monitoring circuit and the transmission distance obtained by the echo signal processing circuit.
According to the radar level gauge of at least one embodiment of the present disclosure, the voltage monitoring circuit comprises a monitoring capacitor, and the adjustable voltage source is a digitally controlled adjustable voltage source, a feedback resistance controlled adjustable voltage source or a feedback voltage controlled adjustable voltage source.
According to at least one embodiment of the present disclosure, the voltage monitoring circuit further comprises a feedback resistor or a feedback voltage circuit.
According to the radar level gauge of at least one embodiment of the present disclosure, the signal width adjustment circuit comprises a first switching tube driven to conduct by a pulse driving signal, and the switching state of the first switching tube is adjusted by controlling the signal width of the pulse driving signal to adjust the signal width of the microwave signal.
According to the radar level gauge of at least one embodiment of the present disclosure, the signal width adjusting circuit comprises a first switching tube and an adjustable capacitance device, a pulse driving signal charges the adjustable capacitance device so that the adjustable capacitance device outputs a control signal to control the first switching tube, and the signal width of the control signal applied to the first switching tube is controlled by adjusting the capacitance value of the adjustable capacitance device to control the switching state of the first switching tube.
According to the radar level gauge of at least one embodiment of the present disclosure, the capacitance value of the adjustable capacitance means is adjusted based on a transmission distance of the microwave signal obtained by an echo signal processing circuit.
According to the radar level gauge of at least one embodiment of the present disclosure, the signal width adjusting circuit includes a first switching tube, a control signal output circuit and a controllable delay flipping signal circuit, wherein the control signal output circuit controls a switching state of the first switching tube based on an input pulse driving signal and the controllable delay flipping signal output by the controllable delay flipping signal circuit to adjust the signal width of the microwave signal.
According to the radar level gauge of at least one embodiment of the present disclosure, the controllable delay flipping signal circuit is controlled by a delay control signal to cause the controllable delay flipping signal circuit to output the controllable delay flipping signal, and the delay control signal is adjusted based on a transmission distance of the microwave signal obtained by an echo signal processing circuit.
According to the radar level gauge of at least one embodiment of the present disclosure, the controllable delay flipping signal circuit comprises an adjustable capacitance device, and a capacitance value of the adjustable capacitance device is adjusted by the delay control signal to adjust a switching state of the first switching tube, so as to adjust a signal width of the microwave signal.
According to the radar level gauge of at least one embodiment of the present disclosure, the control signal output circuit includes a first resistor and a second resistor, the controllable delay flip signal circuit further includes a second switch tube, a pulse driving signal drives the first switch tube via the first resistor, the first switch tube is turned on, the pulse driving signal charges the adjustable capacitance device via the second resistor, when the adjustable capacitance device is charged to a preset voltage, the second switch tube is turned on to ground a control end of the first switch tube, the first switch tube is adjusted from an on state to an off state, and a switching state of the first switch tube is adjusted to adjust a signal width of the microwave signal.
According to the radar level gauge of at least one embodiment of the present disclosure, the adjustable capacitance arrangement comprises a controllable voltage source and a varactor diode, and a capacitance value of a junction capacitance of the varactor diode is adjusted by controlling a voltage applied to the varactor diode by the controllable voltage source to adjust a capacitance value of the adjustable capacitance arrangement.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.
FIG. 1 is a schematic diagram of a partial circuit configuration of a guided wave radar level gauge for adjusting a transmitted signal waveform according to one embodiment of the present disclosure.
FIG. 2 is a schematic diagram of a partial circuit configuration of a guided wave radar level gauge for adjusting a transmitted signal waveform according to yet another embodiment of the present disclosure.
FIG. 3 is a circuit configuration diagram of a signal amplitude adjustment circuit and a signal width adjustment circuit of the guided wave radar level gauge for adjusting a transmitted signal waveform according to one embodiment of the present disclosure.
FIG. 4 is a circuit configuration diagram of a signal amplitude adjustment circuit and a signal width adjustment circuit of the guided wave radar level gauge for adjusting a transmitted signal waveform according to yet another embodiment of the present disclosure.
FIG. 5 is a circuit configuration diagram of a signal amplitude adjustment circuit and a signal width adjustment circuit of the guided wave radar level gauge for adjusting a transmitted signal waveform according to yet another embodiment of the present disclosure.
FIG. 6 is a circuit configuration diagram of a signal amplitude adjustment circuit and a signal width adjustment circuit of the guided wave radar level gauge for adjusting a transmitted signal waveform according to yet another embodiment of the present disclosure.
FIG. 7 is a circuit configuration diagram of a signal amplitude adjustment circuit and a signal width adjustment circuit of the guided wave radar level gauge for adjusting a transmitted signal waveform according to yet another embodiment of the present disclosure.
FIG. 8 is a flow chart of a method of adjusting a guided wave radar level gauge transmitting signal waveforms for distance measurement according to an embodiment of the present disclosure.
Description of the reference numerals
100 radar level gauge
101 microwave signal generating module
102 waveform adjusting circuit
103 echo signal processing circuit
1021 signal amplitude adjusting circuit
1022 signal width adjusting circuit
1023 signal output circuit
1041 a first switch tube
1042 Adjustable capacitor device
1043 control signal output circuit
1044 controllable delay turnover signal circuit
1045 a second switch tube.
Detailed Description
The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. Technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Unless otherwise indicated, the illustrated exemplary embodiments/examples are to be understood as providing exemplary features of various details of some ways in which the technical concepts of the present disclosure may be practiced. Accordingly, unless otherwise indicated, features of the various embodiments may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concept of the present disclosure.
The use of cross-hatching and/or shading in the drawings is generally used to clarify the boundaries between adjacent components. As such, unless otherwise noted, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for a particular material, material property, size, proportion, commonality between the illustrated components and/or any other characteristic, attribute, property, etc., of a component. Further, in the drawings, the size and relative sizes of components may be exaggerated for clarity and/or descriptive purposes. While example embodiments may be practiced differently, the specific process sequence may be performed in a different order than that described. For example, two processes described consecutively may be performed substantially simultaneously or in reverse order to that described. In addition, like reference numerals denote like parts.
When an element is referred to as being "on" or "on," "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements may be present. However, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element, there are no intervening elements present. For purposes of this disclosure, the term "connected" may refer to physically, electrically, etc., and may or may not have intermediate components.
For descriptive purposes, the present disclosure may use spatially relative terms such as "below … …," below … …, "" below … …, "" below, "" above … …, "" above, "" … …, "" higher, "and" side (e.g., "in the sidewall") to describe one component's relationship to another (other) component as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below … …" can encompass both an orientation of "above" and "below". Further, the devices may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, when the terms "comprises" and/or "comprising" and variations thereof are used in this specification, the presence of stated features, integers, steps, operations, elements, components and/or groups thereof are stated but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximate terms and not as degree terms, and as such, are used to interpret inherent deviations in measured values, calculated values, and/or provided values that would be recognized by one of ordinary skill in the art.
FIG. 1 is a schematic diagram of a partial circuit configuration of a guided wave radar level gauge for adjusting a transmitted signal waveform according to one embodiment of the present disclosure. FIG. 2 is a schematic diagram of a partial circuit configuration of a guided wave radar level gauge for adjusting a transmitted signal waveform according to yet another embodiment of the present disclosure. FIG. 3 is a circuit configuration diagram of a signal amplitude adjustment circuit and a signal width adjustment circuit of the guided wave radar level gauge for adjusting a transmitted signal waveform according to one embodiment of the present disclosure. FIG. 4 is a circuit configuration diagram of a signal amplitude adjustment circuit and a signal width adjustment circuit of the guided wave radar level gauge for adjusting a transmitted signal waveform according to yet another embodiment of the present disclosure. FIG. 5 is a circuit configuration diagram of a signal amplitude adjustment circuit and a signal width adjustment circuit of the guided wave radar level gauge for adjusting a transmitted signal waveform according to yet another embodiment of the present disclosure. FIG. 6 is a circuit configuration diagram of a signal amplitude adjustment circuit and a signal width adjustment circuit of the guided wave radar level gauge for adjusting a transmitted signal waveform according to yet another embodiment of the present disclosure. FIG. 7 is a circuit configuration diagram of a signal amplitude adjustment circuit and a signal width adjustment circuit of the guided wave radar level gauge for adjusting a transmitted signal waveform according to yet another embodiment of the present disclosure. FIG. 8 is a flow chart of a method of adjusting a guided wave radar level gauge transmitting signal waveforms for distance measurement according to an embodiment of the present disclosure.
The guided wave radar level gauge for adjusting a transmitted signal waveform of the present disclosure is described in detail below with reference to the drawings of the present disclosure.
Referring to fig. 1 to 2, a radar level gauge 100 of one embodiment of the present disclosure comprises:
the microwave signal generating module 101, the microwave signal generating module 101 generates microwave signals; the waveform adjusting circuit 102, the waveform adjusting circuit 102 is configured to adjust a waveform of the microwave signal generated by the microwave signal generating module 101;
the waveform adjusting circuit 102 includes a signal amplitude adjusting circuit 1021 and a signal width adjusting circuit 1022, wherein the signal amplitude adjusting circuit 1021 adjusts the signal amplitude of the microwave signal generated by the microwave signal generating module 101 based on the transmission distance of the microwave signal, and the signal width adjusting circuit 1022 adjusts the signal width of the microwave signal generated by the microwave signal generating module 101 based on the transmission distance of the microwave signal.
The radar level gauge 100 of the present disclosure has a transmit signal waveform adjustment circuit and corresponding waveform control logic.
The waveform of the echo signal is changed by adjusting the waveform of the transmitted signal, so that the measurement accuracy under different distances and different measurement working conditions is improved, and the measurement accuracy limit of the traditional guided wave radar level meter is finally broken through.
The radar level meter disclosed by the invention adjusts the echo signal by arranging the signal amplitude adjusting circuit and/or the signal width adjusting circuit, can increase the measuring range of the radar level meter and has a better measuring result.
The signal amplitude adjusting circuit of the radar level gauge adjusts the amplitude of the transmitted signal by adjusting the output voltage, and has the advantages that the amplitudes of echo signals at different distances can be basically kept consistent, or the attenuation degree of the signals along with the increase of the distance amplitude is reduced, and the measurement precision and the measurement reliability are improved.
The signal width adjusting circuit of the radar level meter preferably adjusts the pulse width of the transmitted signal by adjusting the capacitance value in the signal width adjusting circuit, and because the pulse width is narrow, the signal frequency spectrum is wide, the loss is large during long-distance transmission, and the signal is easy to distort and deform, the pulse width is adjusted to be wide during long-distance measurement, the frequency spectrum with low frequency is obtained, and thus the long-distance transmission of the waveform is realized.
According to a preferred embodiment of the present disclosure, referring to FIGS. 1-2, the radar level gauge 100 further comprises echo signal processing circuitry 103, the echo signal processing circuitry 103 obtaining a transmission distance of the microwave signal based on an echo signal corresponding to the received microwave signal.
Wherein the transmission distance may be obtained based on a time difference between a transmission time of the microwave signal and a reception time of the echo signal.
With the radar level gauge 100 of the various embodiments described above, it is preferred that the signal amplitude adjustment circuit 1021 comprises a voltage adjustment circuit that adjusts the voltage of the microwave signal generated by the microwave signal generation module 101 to adjust the signal amplitude of the microwave signal.
Fig. 3 shows a circuit configuration of an embodiment of the voltage adjustment circuit, which includes an adjustable voltage source and a voltage monitoring circuit, wherein the adjustable voltage source adjusts an output voltage of the adjustable voltage source based on a monitored voltage of the voltage monitoring circuit and a transmission distance obtained by the echo signal processing circuit 103.
Wherein the voltage monitoring circuit may comprise a monitoring capacitance, and according to a preferred embodiment of the present disclosure, the voltage monitoring circuit further comprises a feedback resistor or a feedback voltage circuit.
The adjustable voltage source of the above embodiment may be a digitally controlled adjustable voltage source, a feedback resistance controlled adjustable voltage source, or a feedback voltage controlled adjustable voltage source.
The adjustable voltage source described above may adjust the output voltage of the adjustable voltage source based on the feedback voltage signal of the feedback resistor, or may adjust the output voltage of the adjustable voltage source based on the feedback voltage signal of the feedback voltage circuit.
Wherein the feedback resistor may be a feedback resistor based on manual trimming adjustment or a feedback resistor based on digital adjustment.
Also shown in fig. 3 is a circuit structure of a signal width adjusting circuit of the radar level gauge 100 according to an embodiment of the present disclosure, wherein the signal width adjusting circuit 1022 includes a first switching tube 1041, the first switching tube 1041 is driven by a pulse driving signal to conduct, and a switching state of the first switching tube 1041 is adjusted by controlling a signal width of the pulse driving signal to adjust a signal width of a microwave signal.
In this embodiment, the signal width adjusting circuit 1022 includes a first switch tube 1041, and when the pulse driving signal is at a high level, the first switch tube 1041 is turned on.
In this embodiment, the first switch tube 1041 may be a high-speed switch tube (e.g., a high-speed triode), a pulse driving signal is input to a control terminal (base) of the high-speed triode, and the switching state of the first switch tube 1041 is controlled by controlling a signal width of the pulse driving signal, so as to control a time width of the microwave signal, that is, control a signal width of the microwave signal.
According to a preferred embodiment of the present disclosure, the signal width of the pulse driving signal may be adjusted based on the transmission distance of the microwave signal obtained by the echo signal processing circuit 103 described above.
Fig. 3 also shows a signal output circuit 1023, the signal output circuit 1023 outputs the signal whose voltage amplitude and signal pulse width are adjusted by a signal amplitude adjustment circuit 1021 and a signal width adjustment circuit 1022, and the microwave signal generation module 101 generates the microwave signal based on the signal.
As shown in fig. 3, preferably, the emitter of the first switch tube 1041 is grounded, the collector of the first switch tube 1041 serves as a voltage output terminal, and the collector of the first switch tube 1041 is connected to the adjustable voltage source.
Preferably, the signal output circuit 1023 includes a dc blocking capacitor to output the adjusted signal.
FIG. 4 is a circuit configuration diagram of a signal amplitude adjustment circuit 1021 and a signal width adjustment circuit 1022 of the guided wave radar level gauge 100 for adjusting a transmitted signal waveform according to yet another embodiment of the present disclosure.
As shown in fig. 4, the signal width adjusting circuit 1022 includes a first switch tube 1041 and an adjustable capacitor 1042, the pulse driving signal charges the adjustable capacitor 1042 to make the adjustable capacitor 1042 output a control signal to control the first switch tube 1041, and the signal width of the control signal applied to the first switch tube 1041 is controlled by adjusting the capacitance of the adjustable capacitor 1042 to control the on/off state of the first switch tube 1041.
The adjustable capacitance device 1042 is preferably a digital adjustable capacitance, and more preferably, the adjustable capacitance device 1042 includes a plurality of capacitors and a capacitor access switch, and the capacitance of the adjustable capacitance device 1042 is adjusted by adjusting the number of the accessed capacitors.
For the radar level gauge 100 of the present embodiment, the capacitance value of the adjustable capacitance means 1042 is adjusted based on the transmission distance of the microwave signal obtained by the echo signal processing circuit 103.
FIG. 5 is a circuit configuration diagram of a signal amplitude adjustment circuit 1021 and a signal width adjustment circuit 1022 of the guided wave radar level gauge 100 for adjusting a transmitted signal waveform according to yet another embodiment of the present disclosure.
As shown in fig. 5, the signal width adjusting circuit 1022 includes a first switch tube 1041, a control signal output circuit 1043, and a controllable delay flipping circuit 1044, where the control signal output circuit 1043 controls a switching state of the first switch tube 1041 based on the input pulse driving signal and the controllable delay flipping signal output by the controllable delay flipping circuit 1044, so as to adjust the signal width of the microwave signal.
In this embodiment, as shown in fig. 5, the pulse driving signal supplies power to the controllable delay flipping signal circuit 1044 and turns on the first switch tube 1041, when the voltage of the controllable delay flipping signal circuit 1044 reaches a preset value, the controllable delay flipping signal circuit 1044 outputs a controllable delay flipping signal, so that the first switch tube 1041 is switched from the on state to the off state, and the time required for the voltage of the controllable delay flipping signal circuit 1044 to reach the preset value is adjusted by the delay control signal, thereby controlling the time required for the first switch tube 1041 to be switched from the on state to the off state, so that the signal width of the microwave signal is adjusted by controlling the on-off state of the first switch tube 1041.
Wherein the delay control signal is adjusted based on the transmission distance of the microwave signal obtained by the echo signal processing circuit 103.
For the signal width adjusting circuit 1022 in the foregoing embodiment, preferably, the controllable delay flipping circuit 1044 includes an adjustable capacitor 1042, and the capacitance of the adjustable capacitor 1042 is adjusted by the delay control signal to adjust the switching state of the first switch tube 1041, so as to adjust the signal width of the microwave signal.
In this embodiment, the delay control signal (e.g., the signal width control signal) controls the time required for the voltage of the controllable delay flipping signal circuit 1044 to reach the preset value by adjusting the capacitance value of the adjustable capacitor 1042, i.e., controls the time required for the first switch tube 1041 to switch from the on state to the off state, so that the signal width of the microwave signal is adjusted by controlling the on-off state of the first switch tube 1041.
As to the signal width adjusting circuit 1022 in each of the above embodiments, referring to fig. 6, preferably, the control signal output circuit 1043 includes a first resistor R1 and a second resistor R2, and the controllable delay flipping signal circuit 1044 further includes a second switch tube 1045, the pulse driving signal drives the first switch tube 1041 through the first resistor R1, the first switch tube 1041 is turned on, the pulse driving signal charges the adjustable capacitor 1042 through the second resistor R2, when the adjustable capacitor 1042 is charged to a preset voltage, the second switch tube 1045 is turned on to ground the control terminal of the first switch tube 1041, the first switch tube 1041 is adjusted from the on state to the off state, and the signal width of the microwave signal is adjusted by adjusting the switching state of the first switch tube 1041.
In this embodiment, when the pulse driving signal is at a high level, the first switch tube 1041 is turned on, and the adjustable capacitor 1042 is charged, and when the adjustable capacitor 1042 is charged to a predetermined voltage, the second switch tube 1045 is turned on to ground the control end of the first switch tube 1041, that is, the first switch tube 1041 is switched from the on state to the off state.
In this embodiment, the capacitance of the adjustable capacitor 1042 can be adjusted by a signal width control signal to control the time required for the second switch tube 1045 to switch from the off state to the on state, so as to control the time required for the first switch tube 1041 to switch from the on state to the off state, thereby achieving the adjustable output signal width of the signal output circuit 1023.
As shown in fig. 6, the pulse driving signal is input to the control terminal of the first switch tube 1041 and the adjustable capacitor device through the first resistor R1 and the second resistor R2, the emitter of the first switch tube 1041 and the emitter of the second switch tube 1045 are both grounded, and the control terminal (base) of the first switch tube 1041 is further connected to the collector of the second switch tube 1045.
The resistance values of the first resistor R1 and the second resistor R2 can be preset.
The adjustable capacitance device 1042 is preferably a digital adjustable capacitance, and more preferably, the adjustable capacitance device 1042 includes a plurality of capacitors and a capacitor access switch, and the capacitance of the adjustable capacitance device 1042 is adjusted by adjusting the number of the accessed capacitors.
The capacitance value of the adjustable capacitance device 1042 may be adjusted by a signal width control signal, which may be generated based on a transmission distance of the microwave signal obtained by the echo signal processing circuit 103.
For the radar level gauge of the present disclosure, the above described embodiments enable comparatively accurate signal amplitude adjustment as well as signal width adjustment. However, there is still room for further improvement in the resolution of the tunable capacitance arrangement of each of the above embodiments.
FIG. 7 is a more preferred embodiment of the radar level gauge 100 of the present disclosure. The present embodiment further improves the structure of the adjustable capacitance device 1042.
As shown in fig. 7, the tunable capacitance device 1042 includes a controllable voltage source and a varactor diode D6, and the capacitance value of the tunable capacitance device 1042 is adjusted by adjusting the voltage applied to the varactor diode D6 by the controllable voltage source to adjust the capacitance value of the junction capacitance of the varactor diode.
As shown in fig. 7, the tunable capacitor device 1042 of this embodiment can linearly adjust the capacitance and further adapt to the linear change of the transmission distance of the microwave signal.
In the embodiment, the controllable voltage source and the variable capacitance diode are used for forming the adjustable capacitance-variable device, and meanwhile, the controllable voltage source can be controlled by a DA output signal which can be driven by the operational amplifier.
FIG. 8 is a flow chart of a method of adjusting a guided wave radar level gauge transmitting signal waveforms for distance measurement according to an embodiment of the present disclosure.
As shown in FIG. 8, a method S100 of distance measurement by a radar level gauge according to the present disclosure comprises:
s102, transmitting an initial microwave signal to a target object by using a radar level gauge;
s104, receiving an initial echo signal of the initial microwave signal;
s106, acquiring an initial measurement distance of the target object based on an initial echo signal of the initial microwave signal;
s108, generating a signal amplitude adjustment amount and/or a signal width adjustment amount based on the signal amplitude and/or the signal width of the initial microwave signal and the initial measurement distance; and the number of the first and second groups,
and S110, generating an adjusted microwave signal by the radar level gauge based on the signal amplitude adjustment amount and/or the signal width adjustment amount, and transmitting the adjusted microwave signal to the target object.
According to a preferred embodiment of the present disclosure, generating a signal amplitude adjustment amount and/or a signal width adjustment amount based on a signal amplitude and/or a signal width of an initial microwave signal and an initial measurement distance includes:
and generating a signal amplitude adjustment amount and/or a signal width adjustment amount based on the signal amplitude and/or the signal width of the initial microwave signal and the ideal signal amplitude and/or the ideal signal width corresponding to the initial measurement distance.
For the methods of the above embodiments, preferably, the initial microwave signal is a preset microwave signal having a desired signal amplitude and/or a desired signal width.
The target object described above may be a liquid level.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example" or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.
Claims (14)
1. A guided wave radar level gauge for adjusting a transmitted signal waveform, comprising:
the microwave signal generation module generates a microwave signal; and
the waveform adjusting circuit is used for adjusting the waveform of the microwave signal generated by the microwave signal generating module;
the waveform adjusting circuit comprises a signal amplitude adjusting circuit and/or a signal width adjusting circuit, the signal amplitude adjusting circuit adjusts the signal amplitude of the microwave signal generated by the microwave signal generating module based on the transmission distance of the microwave signal, and the signal width adjusting circuit adjusts the signal width of the microwave signal generated by the microwave signal generating module based on the transmission distance of the microwave signal.
2. The guided wave radar level gauge for adjusting transmitted signal waveforms of claim 1, further comprising echo signal processing circuitry, wherein the echo signal processing circuitry obtains a transmission distance of the microwave signal based on an echo signal corresponding to the received microwave signal.
3. The guided wave radar level gauge for adjusting the waveform of transmitted signals of claim 2, wherein the signal amplitude adjustment circuit comprises a voltage adjustment circuit that adjusts the signal amplitude of the microwave signal.
4. The guided wave radar level gauge for adjusting transmitted signal waveforms of claim 3, wherein the voltage adjustment circuit comprises an adjustable voltage source and a voltage monitoring circuit, the adjustable voltage source adjusting an output voltage of the adjustable voltage source based on a monitored voltage of the voltage monitoring circuit and the transmission distance obtained by the echo signal processing circuit.
5. The guided wave radar level gauge for adjusting the waveform of transmitted signals of claim 4, wherein the voltage monitoring circuit comprises a monitoring capacitor, and the adjustable voltage source is a digitally controlled adjustable voltage source, a feedback resistance controlled adjustable voltage source, or a feedback voltage controlled adjustable voltage source.
6. A guided wave radar level gauge for conditioning transmitted signal waveforms according to claim 4 or 5, wherein said voltage monitoring circuitry further comprises a feedback resistor or a feedback voltage circuit.
7. The guided wave radar level gauge for adjusting a waveform of a transmitted signal of claim 1, wherein the signal width adjusting circuit comprises a first switch tube driven to conduct by a pulse driving signal, and wherein a signal width of the microwave signal is adjusted by controlling a signal width of the pulse driving signal to adjust a switching state of the first switch tube.
8. The guided wave radar level gauge for adjusting transmitted signal waveforms of claim 1, wherein the signal width adjusting circuit comprises a first switch tube and an adjustable capacitance device, wherein a pulse driving signal charges the adjustable capacitance device so that the adjustable capacitance device outputs a control signal to control the first switch tube, and wherein a signal width of the control signal applied to the first switch tube is controlled by adjusting a capacitance value of the adjustable capacitance device to control a switching state of the first switch tube.
9. The guided wave radar level gauge for adjusting transmitted signal waveforms of claim 8, wherein a capacitance value of the adjustable capacitance device is adjusted based on a transmission distance of the microwave signal obtained by an echo signal processing circuit.
10. The guided wave radar level gauge for adjusting the waveform of a transmitted signal of claim 1, wherein the signal width adjusting circuit comprises a first switch tube, a control signal output circuit and a controllable delay flip signal circuit, wherein the control signal output circuit controls the switching state of the first switch tube based on an input pulse driving signal and the controllable delay flip signal output by the controllable delay flip signal circuit to adjust the signal width of the microwave signal.
11. The guided wave radar level gauge for adjusting the waveform of a transmitted signal of claim 10, wherein the controllable delay flipped signal circuit is controlled by a delay control signal to cause the controllable delay flipped signal circuit to output the controllable delay flipped signal, the delay control signal being adjusted based on the transmission distance of the microwave signal obtained by the echo signal processing circuit.
12. The guided wave radar level gauge for adjusting the waveform of a transmitted signal of claim 11, wherein the controllable delay flipping signal circuit comprises an adjustable capacitance device, and the capacitance value of the adjustable capacitance device is adjusted by the delay control signal to adjust the switching state of the first switch tube, so as to adjust the signal width of the microwave signal.
13. The guided wave radar level gauge for adjusting the waveform of the transmitted signal of claim 12, wherein the control signal output circuit comprises a first resistor and a second resistor, the controllable delay flip signal circuit further comprises a second switch tube, a pulse driving signal drives the first switch tube via the first resistor, the first switch tube is turned on, the pulse driving signal charges the adjustable capacitor device via the second resistor, when the adjustable capacitor device is charged to a preset voltage, the second switch tube is turned on to ground the control terminal of the first switch tube, the first switch tube is adjusted from the on state to the off state, and the signal width of the microwave signal is adjusted by adjusting the on state of the first switch tube.
14. The guided wave radar level gauge for adjusting transmit signal waveforms of claim 8 or 12, wherein the adjustable capacitance means comprises a controllable voltage source and a varactor diode, and a capacitance value of the adjustable capacitance means is adjusted by adjusting a capacitance value of a junction capacitance of the varactor diode by controlling a voltage applied to the varactor diode by the controllable voltage source.
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| CN113252139A (en) * | 2021-06-28 | 2021-08-13 | 北京锐达仪表有限公司 | Guided wave radar level meter for adjusting transmitted signal waveform |
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