CN109991598B - Array frequency modulation radar real-time section measuring device and method - Google Patents
Array frequency modulation radar real-time section measuring device and method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
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Abstract
The invention relates to an array frequency modulation radar real-time section measurement device and method. The measuring device includes: an antenna array (20) for transmitting and receiving radar signals, the transmitted and received radar signals being a sequence of electromagnetic wave pulses of progressively varying frequency; a chip (30) capable of generating and adjusting the radar signals transmitted by each antenna (21) in the antenna array (20), receiving radar signals reflected by the interface of the section from the antenna (21), processing the transmitted radar signals and the received radar signals, and converting them into digital signals for storage; and a data processing and input/output module (40) capable of calculating, from said digital signals, the distance between the interface of said section and the antennas (21) of said antenna array (20) and/or the thickness of the layers of said section; and receives parameters of the radar signal input by a user and transmits to the chip (30) to generate a radar signal.
Description
Technical Field
The invention relates to the technical field of section measurement, in particular to an array frequency modulation radar real-time section measurement device and a method for measuring the section of a measured object by using the array frequency modulation radar real-time section measurement device.
Background
In the process industry, such as the steel industry, it is often encountered that a section of an object needs to be measured. The cross section includes a plurality of stacked dielectric layers. One conventional section measurement method uses a contact measurement method. A probe to be measured, such as a radar probe, is inserted into the object to be measured for measurement. For certain objects, such as high temperature, corrosion, etc., the contact measurement method is not well suited. Another prior art section measurement method is to use a probe for measurement in a manual manner, which cannot be performed in real time. Another conventional section measurement method uses two or more radar measurement devices in combination, which is expensive and requires a certain installation space.
Disclosure of Invention
The invention aims to provide an array frequency modulation radar real-time section measuring device and method, which can measure sections in a non-contact and real-time manner, and have high integration level and small volume.
One aspect of the present invention provides an array frequency modulation radar real-time section measurement device, comprising:
An antenna array for transmitting and receiving radar signals, the transmitted and received radar signals being electromagnetic wave pulse sequences of gradually varying frequency;
The chip can generate and adjust radar signals transmitted by each antenna in the antenna array, receive radar signals reflected by the interface of the section from the antennas, process the transmitted radar signals and the received radar signals and convert the radar signals into digital signals to be stored; and
The data processing and input/output module can calculate the distance between the interface of the section and the antenna of the antenna array and/or the thickness of each layer of the section according to the digital signals; and receives parameters of the radar signal input by the user and transmits the parameters to the chip to generate the radar signal. The array frequency modulation radar real-time section measuring device can measure sections in a non-contact and real-time mode, and is high in integration level and small in size.
In an exemplary embodiment of an array fm radar real-time profile measurement apparatus, a chip includes:
A radio frequency signal and local oscillation signal synthesizer capable of synthesizing a radar signal and a local oscillation signal of radio frequency;
A transmitting/receiving isolator which obtains a synthesized radar signal from the radio frequency signal and local oscillation signal synthesizer and transmits the synthesized radar signal to the antenna array, receives a reflected radar signal from the antenna array, and isolates the transmitted and received radar signal;
an analog pre-low noise amplifier that obtains and amplifies the received radar signal from the transmit/receive isolator;
A mixer for obtaining local oscillation signal from the radio frequency signal and local oscillation signal synthesizer, obtaining amplified radar signal from the analog pre-low noise amplifier, and mixing the local oscillation signal and the amplified radar signal to obtain an intermediate frequency signal;
an intermediate frequency signal processor which filters and amplifies the intermediate frequency signal;
An analog-to-digital converter for converting the analog signal output by the intermediate frequency signal processor into a digital signal;
A digital memory capable of storing digital signals; and
And a controller capable of controlling the cooperative operation of the devices in the chip.
The chip has a simple structure and high integration level, can perform frequency domain signal mixing processing through the transmitted and received radar signals, and can obtain digital signals so as to calculate the distance between the interface or the point in the interface and the antenna of the antenna array in subsequent application, further calculate the thickness of each layer of the section of the measured object, and draw a two-dimensional or three-dimensional graph of the section of the measured object.
In another exemplary embodiment of the array fm radar real-time section measurement apparatus, the data processing and input/output module includes a data processing and imaging unit capable of obtaining data from the digital memory and calculating distances between respective interfaces of the section and antennas of the antenna array and forming two-dimensional/three-dimensional images of the section. The data processing and imaging unit outputs the two-dimensional/three-dimensional image of the section to the imaging device for image display (such as a display, augmented reality, virtual reality and the like), so that the section information of the measured object can be more conveniently checked by a user.
In yet another exemplary embodiment of the array fm radar real-time section measurement apparatus, the data processing and input/output module further includes at least one interface that is one or more of a USB interface, a PROFINET interface, a wireless PLC interface, and a 4-20mA communication interface. A variety of different interfaces facilitate the communication of the measuring device with external devices (e.g., remote control centers, user computers, industrial clouds).
In a further exemplary embodiment of the array frequency modulated radar real-time section measuring device, the data processing and imaging unit is further capable of receiving and storing parameters of radar signals that match respective interfaces of the object under test; the radio frequency signal and local oscillation signal synthesizer obtains parameters of the radar signal from the data processing and imaging unit from the digital memory to synthesize the radar signal at radio frequency. The user can conveniently input the parameters of the radar signals to the data processing and imaging unit (for example, through interfaces), and each interface corresponds to one group of parameters of the radar signals, so that the radar signals can be conveniently adjusted according to the measured object during measurement, and the radar signal processing device is convenient to use.
In yet another exemplary embodiment of the array fm radar real-time profile measurement apparatus, the apparatus further includes a first PCB, and the antenna array and the chip are integrated on the first PCB. Thus, the integration level is further improved.
In yet another exemplary embodiment of an array fm radar real-time profile measurement apparatus, a radio frequency signal and local oscillation signal synthesizer includes:
The radio frequency signal synthesizer is used for synthesizing radio frequency radar signals, and the radio frequency radar signals are triangular waves or saw-tooth waves; and
And the local oscillation signal synthesizer is used for generating a local oscillation signal, and the local oscillation signal is a sine wave signal of radio frequency.
In another aspect of the present invention, there is provided a method of measuring a cross-section of an object to be measured using the apparatus, the cross-section of the object to be measured including at least a first interface and a second interface, the method comprising:
the data processing and input/output module receives parameters of a radar signal input by a user and transmits the parameters to the chip to generate the radar signal, wherein the radar signal comprises a first transmitting signal matched with the first interface and a second transmitting signal matched with the second interface;
transmitting a first transmission signal to the tested object by using an antenna of the antenna array and receiving a first reflection signal, wherein the first reflection signal is a signal of the first transmission signal reflected by a first interface;
The chip receives a first reflected signal from the antenna, processes the first transmitted signal and the first reflected signal, converts the first transmitted signal and the first reflected signal into a first digital signal and stores the first digital signal;
Transmitting a second transmitting signal to the tested object by using an antenna of the antenna array and receiving a second reflecting signal, wherein the second reflecting signal is a signal of the second transmitting signal reflected by a second interface;
The chip receives a second reflected signal from the antenna, processes the second transmitted signal and the second reflected signal and converts the second transmitted signal and the second reflected signal into a second digital signal to be stored;
The data processing and input/output module calculates a first distance according to the first digital signal, calculates a second distance according to the second digital signal, and then obtains a distance between the first interface and the second interface according to the first distance and the second distance, wherein the first distance is a distance between the first interface and an antenna of the antenna array, and the second distance is a distance between the second interface and the antenna of the antenna array.
According to the method, each interface is scanned, radar signals (namely, transmitting signals) matched with the interface are transmitted, the corresponding reflected radar signals (namely, reflected signals) are received, the distance between each point of the interface and a corresponding antenna is further obtained, the distance between adjacent interfaces is further obtained, and the method is simple, convenient and fast in speed, and real-time measurement can be achieved.
In an exemplary embodiment of a method of measuring a cross section of a measured object, each antenna in an antenna array simultaneously/individually/cooperatively transmits a first transmission signal to obtain a first distance between a plurality of points on a first interface and a corresponding antenna in the antenna array;
Each antenna in the antenna array transmits a second transmission signal simultaneously/one by one/cooperatively to obtain a second distance between a plurality of points on the second interface and corresponding antennas in the antenna array,
The data processing and input/output module generates a two-dimensional/three-dimensional graph of the section of the measured object according to a first distance between a plurality of points on the first interface and corresponding antennas in the antenna array and a second distance between a plurality of points on the second interface and corresponding antennas in the antenna array. The method can conveniently, accurately and real-timely obtain the two-dimensional/three-dimensional graph of the section of the measured object.
In another exemplary embodiment of the method of measuring the cross section of a measured object, crystallizer casting powder, tundish covering agent, ladle slag, electric furnace slag, open-hearth slag, converter slag, paper in the paper industry, paper piles, substances in tanks in the petrochemical industry, chemicals in tanks in the chemical industry, chemicals in tanks in the wastewater treatment industry, chemicals in tanks in the food industry, storage substances in coal and mining fields, solid substances on conveyor belts in the steel industry.
Drawings
The above features, technical features, advantages and the manner of attaining them will be further described in more detail by the description of the preferred embodiments and by reference to the accompanying drawings in a manner that is clearly understood in the following, wherein:
FIG. 1 is a schematic diagram of a real-time section measurement device for an array frequency modulation radar according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a real-time section measurement device for measuring a section of an object using an array FM radar according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for measuring a cross-section of the object using the apparatus according to an embodiment of the present invention.
Description of the reference numerals:
10 objects under test
11 First layer
12 Second layer
13 Environmental Medium layer
14 First interface
15 Second interface
20 Antenna array
21 Antenna
30 Chip
31 Radio frequency signal and local oscillation signal synthesizer
311 Radio frequency signal synthesizer
312 Local oscillation signal synthesizer
32 Transmit/receive isolator
33 Analog pre-low noise amplifier
34 Mixer
35 Intermediate frequency signal processor
36 Analog-to-digital converter
37 Digital memory
38 Controller
40 Data processing and input/output module
41 Data processing and imaging unit
42USB interface
43PROFINET interface
44 Wireless PLC interface
45 4-20MA communication interface
50 First PCB board
T1 first emission signal
T2 second transmission signal
R1 first reflected signal
R2 second reflected signal
Distance between H1 first interface and antenna of antenna array
Distance of H2 second interface from antenna of antenna array
Detailed Description
For a clearer understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals refer to like parts throughout the various views.
The figures discussed below, as well as the various embodiments used to describe the principles of the present disclosure in this patent document, are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged device. Various innovative teachings of the present application will be described with reference to exemplary, non-limiting embodiments.
In this document, "schematic" means "serving as an example, instance, or illustration," and any illustrations, embodiments described herein as "schematic" should not be construed as a more preferred or advantageous solution.
For the sake of simplicity of the drawing, the parts relevant to the present invention are shown only schematically in the figures, which do not represent the actual structure thereof as a product. In addition, in order to simplify the drawing for understanding, components having the same structure or function in some drawings are only schematically shown, or only one of them is labeled.
Fig. 1 is a schematic structural diagram of an array fm radar real-time section measurement apparatus according to an embodiment of the invention. Fig. 2 is a schematic diagram of measuring a section of a measured object using an array fm radar real-time section measurement apparatus according to an embodiment of the present invention. As can be seen from fig. 1 and 2, the object 10 to be measured includes a stacked first layer 11 and second layer 12. The cross section of the object 10 includes at least a first interface 14 and a second interface 15. Above the first layer 11 is an ambient medium layer 13 (e.g. an air layer). The interface between the first layer 11 and the environmental dielectric layer 13 is a first interface 14 and the interface between the second layer 12 and the first layer 11 is a second interface 15. The first layer 11, the second layer 12 and the environmental dielectric layer 13 are of different materials and have mutually different dielectric constants.
The array frequency modulation radar real-time section measuring device comprises:
An antenna array 20 for transmitting and receiving radar signals, the transmitted and received radar signals being a sequence of electromagnetic wave pulses of progressively varying frequency;
A chip 30 capable of generating and adjusting the radar signals transmitted from each antenna 21 in the antenna array 20, receiving the radar signals reflected from the interface (first interface 14 or second interface 15) of the section from the antenna 21, and processing the transmitted radar signals and the received radar signals and converting them into digital signals for storage; and
A data processing and input/output module 40 capable of calculating the distance between the interface of the section (first interface 14 or second interface 15) and the antenna 21 of the antenna array 20 and/or the thickness of each layer of the section (first layer 11 and second layer 12) from the digital signals; and receives parameters of the radar signal input by the user and transmits to chip 30 to generate the radar signal.
Before or at the beginning of the measurement, the user (e.g., a measurer) sets parameters of the radar signal through the data processing and input output module 40. The radar signal is an electromagnetic wave pulse sequence with gradually changing frequency. Parameters of the radar signal include frequency, period, waveform, slope of the frequency change, etc. For each interface of the cross section of the object 10 to be measured, the user can adjust the radar signal parameters in real time so that the radar signal matches the interface, i.e. the radar signal is transmitted with an optimal penetration in the medium between the interface and the antenna array 10. Of course, a large number of experiments may be performed in advance, and a database of parameters of radar signals matched with the interface of the cross section of the object 10 to be measured may be obtained and stored in the data processing and input/output module 40. At each measurement, the user manually or the device automatically selects parameters of the radar signal matched with the measured object 10 according to the interface of the measured object.
Chip 30 generates and adjusts the radar signals transmitted by each antenna 21 in antenna array 20 based on the parameters of the radar signals. For each interface of the object 10 to be measured, one antenna 21 in the antenna array 20 emits the radar signal, which is reflected at a certain point of the interface, which antenna 21 receives the radar signal reflected at that point. Each interface corresponds to a matching radar signal. The radar signals correspondingly transmitted by each antenna 21 are the same when the same interface is measured. Radar signals transmitted by different antennas 21 are reflected by different points on the same interface. In an exemplary embodiment, the same antenna 21 receives a reflected signal of the radar signal transmitted by itself. In another exemplary embodiment, antennas 21 can be arranged and combined, with the radar signal transmitted by one antenna being received by the other antenna as its corresponding reflected radar signal. That is, the radar signal emitted from each antenna 21 is reflected by a corresponding point of the interface matched with the radar signal, resulting in a reflected radar signal; each point on the same interface corresponds to a transmitted radar signal and a reflected radar signal.
The chip 30 processes the radar signal and the reflected radar signal correspondingly transmitted at each point or a certain point on the same interface, and converts the radar signal and the reflected radar signal into digital signals to be stored for subsequent application and processing.
The data processing and input/output module 40 calculates the distance between each point or a certain point of the interface and the antenna 21 of the antenna array 20 according to the digital signal corresponding to each point or a certain point on the same interface stored in the chip 30. For example, for a point of the first interface 14, the distance between the point and the antenna 21 of the antenna array 20 may be obtained, referred to as the first distance. For a plurality of points on the first interface 14, a distance between each point and the antenna 21 of the antenna array 20, i.e. a first distance, is obtained. From the first distances of the points on the first interface 14, a two-dimensional or three-dimensional map of the first interface 14 can be drawn. Similarly, for a point of the second interface 15, the distance between that point and the antenna 21 of the antenna array 20 may be obtained, referred to as the second distance. For a plurality of points on the second interface 15, a distance between each point and the antenna 21 of the antenna array 20, i.e. a second distance, is obtained. From the second distances of the points on the second interface 15, a two-dimensional or three-dimensional map of the second interface 15 can be drawn. The thickness of each layer of the cross section of the object to be measured can be obtained from the distance between each interface and the antenna array 20.
The array frequency modulation radar real-time section measuring device can be used for measuring sections in a non-contact and real-time mode, is high in integration level and small in size, and has at least one of the following beneficial effects:
1) An antenna array is adopted to transmit and receive radar signals, so that non-contact measurement is realized, and labor is saved;
2) The multi-phase array radar (multiphase ARRAY RADAR) is utilized to have different transmission/reflection characteristics at interfaces among different medium layers, so that a plurality of parameters can be measured simultaneously;
3) Processing a plurality of radar signals in different reflection states in real time by using one chip, and generating digital signals for subsequent specific application;
4) The multipoint measurement can be realized, and further the drawing of a two-dimensional or three-dimensional image of the section of the measured object is realized;
5) For different interface measurements, the same single measuring device is used, the integration level is high, the anti-interference performance is high, the cost is low, the volume is small, and the installation is easy.
In one exemplary embodiment, the chip 30 includes:
A radio frequency signal and local oscillation signal synthesizer 31 capable of synthesizing a radar signal and a local oscillation signal of radio frequency;
A transmitting/receiving isolator 32 which obtains a synthesized radar signal from the radio frequency signal and local oscillation signal synthesizer 31 and transmits the same to the antenna array 20, receives a reflected radar signal from the antenna array 20, and isolates the transmitted and received radar signal;
an analog pre-low noise amplifier 33 that obtains and amplifies the received radar signal from the transmit/receive isolator 32;
A mixer 34 that obtains a local oscillation signal from the radio frequency signal and local oscillation signal synthesizer 31, obtains an amplified radar signal from the analog pre-low noise amplifier 33, and mixes the local oscillation signal with the amplified radar signal to obtain an intermediate frequency signal;
an intermediate frequency signal processor 35 which filters and amplifies the intermediate frequency signal;
an analog-to-digital converter 36 which converts the analog signal output from the intermediate frequency signal processor 35 into a digital signal;
a digital memory 37 capable of storing digital signals; and
A controller 38 is capable of controlling the co-operation of the various devices in the chip 30.
The digital memory 37 is capable of communicating with the data processing and input output module 40 and receiving parameters of the radar signal entered by the user.
The radio frequency signal and local oscillation signal synthesizer 31 obtains parameters of the radar signal to be transmitted from the digital memory 37, synthesizing the radar signal at radio frequency. The radio frequency signal and local oscillation signal synthesizer 31 also generates a local oscillation signal.
In an exemplary embodiment, the radio frequency signal and local oscillation signal synthesizer 31 comprises:
A radio frequency signal synthesizer 311 for synthesizing a radio frequency radar signal, wherein the radio frequency radar signal is a triangular wave or a sawtooth wave; and
A local oscillation signal synthesizer 312 for generating a local oscillation signal, which is a sine wave signal of radio frequency.
The transmit/receive isolator 32 transmits and transmits the resultant radar signal to and from the antenna 21 of the antenna array 20, and also receives the radar signal reflected by a point on the interface. The transmit/receive isolator 32 also isolates the transmitted and received radar signals from interfering with each other.
The analog pre-low noise amplifier 33 amplifies the received radar signal, and can suppress noise from the environment, the antenna 21, the analog pre-low noise amplifier 33, and the like, and has a large signal-to-noise ratio.
For a point of an interface of the cross section of the object 10 to be measured, the radar signal emitted by the antenna 21 is reflected by the point. The transmitted and received radar signals are electromagnetic wave pulse sequences with gradually changing frequencies. For example, the radar signal is transmitted as a sequence of electromagnetic pulses with a 100MHZ linear increase to 200MHZ, the slope of the line being for example 1. The received radar signal is also a sequence of electromagnetic pulses that increases from 100MHZ to 200MHZ in a straight line with a slope page of 1. When a radar signal of 100MHZ is received, the frequency of the transmitted radar signal is 150MHZ. The mixer 34 in the chip 30 multiplies the local oscillation signal and the received radar signal and the product of the differences results in an intermediate frequency signal comprising the difference frequency information.
The digital signal obtained after the intermediate frequency signal has passed through the intermediate frequency signal processor 35 and the analog-to-digital converter 36 is stored in the digital memory 37 for use in subsequent applications.
The chip has a simple structure and high integration level, can perform frequency domain signal mixing processing through the transmitted and received radar signals, and can obtain digital signals so as to calculate the distance between the interface or the point in the interface and the antenna of the antenna array in subsequent application, further calculate the thickness of each layer of the section of the measured object, and draw a two-dimensional or three-dimensional graph of the section of the measured object.
In an exemplary embodiment, the data processing and input output module 40 includes a data processing and imaging unit 41 capable of obtaining data from the digital memory 37 and calculating distances between respective interfaces of the cross-section and the antennas 21 of the antenna array 20 and forming two-dimensional/three-dimensional images of the cross-section. For example, the data processing and imaging unit 41 obtains digital signals including difference frequency information from the digital memory 37, calculates distances (i.e., first distances) of respective points in the first interface 14 from corresponding antennas in the antenna array 20, and distances (i.e., second distances) of respective points in the second interface 15 from corresponding antennas in the antenna array, and thus can map two-dimensional/three-dimensional images of the cross-section. In addition, the thickness of the first layer 1 between the first interface 14 and the second interface 15 at each point can also be calculated from the distance between each point in the first interface 14 and the corresponding antenna in the antenna array (i.e., the first distance) and the distance between each point in the second interface 15 and the corresponding antenna in the antenna array (i.e., the second distance). The data processing and imaging unit 41 outputs the two-dimensional/three-dimensional image of the cross section to the imaging device for image display (e.g., display, augmented reality, virtual reality, etc.), which is more convenient for the user to view the cross section information of the measured object.
The chip 30 of the test device has integrated therein a radio frequency radar signal transmitting/receiving isolator 32, an analog pre-low noise amplifier 33, a digital memory 37, etc., which allows the configuration of radar signals in real time, and the rapid communication between the chip 30 and the data processing and imaging unit 41 allows for a fast measurement speed and a short time. The refresh frequency of the two-dimensional/three-dimensional image of the section formed by the data processing and imaging unit 41 is high, reaching tens of frames per second, meeting the requirement of real-time measurement.
In an exemplary embodiment, the data processing and input output module 40 further includes at least one interface that is one or more of a USB interface 42, a PROFINET interface 43, a wireless PLC interface 44, and a 4-20mA communication interface 45. A variety of different interfaces facilitate the communication of the measuring device with external devices (e.g., remote control centers, user computers, industrial clouds).
In an exemplary embodiment, the data processing and imaging unit 41 is also capable of receiving and storing parameters of radar signals that match the respective interfaces of the object under test 10; the radio frequency signal and local oscillation signal synthesizer 31 obtains parameters of the radar signal from the data processing and imaging unit 41 from the digital memory 37 to synthesize the radar signal of radio frequency. The user can conveniently input the parameters of the radar signal to the data processing and imaging unit 41 (for example, through interfaces), and each interface corresponds to a group of parameters of the radar signal, so that the radar signal can be conveniently adjusted according to the measured object during measurement, and the use is convenient.
In an exemplary embodiment, the test apparatus further includes a first PCB 50, and the antenna array 20 and the chip 30 are integrated on the first PCB 50. Thus, the integration level is further improved. In addition, the data processing and input/output module 40 further includes a second PCB board (not shown), and the data processing and imaging unit 41 and the interface are mounted on the second PCB board.
FIG. 3 is a flow chart of a method for measuring a cross-section of the object using the apparatus according to an embodiment of the present invention. A method of measuring a cross section of the object 10 using the apparatus, comprising:
s100, the data processing and input/output module 40 receives parameters of the radar signal input by the user and transmits the parameters to the chip 20 to generate the radar signal, wherein the radar signal comprises a first transmitting signal T1 matched with the first interface 14, and a second transmitting signal T2 matched with the second interface 15.
In this step, the radar signal transmitted by the antenna array 10 is generated by the chip 20 according to the parameters input by the user. For each interface, the medium between the interface and the antenna array 10 is specific, and the medium between different interfaces and the antenna array 10 is different. The medium between the first interface 14 and the antenna array 10 is an ambient medium layer 13, and the medium between the second interface 15 and the antenna array 10 is a laminated ambient medium layer 13 and first layer 11. The first transmission signal T1 is matched to the first interface 14, i.e. the first transmission signal T1 has the best penetration capacity for transmission in the medium (the surrounding medium layer 13) between the first interface 14 and the antenna array 10. The second transmission signal T2 is matched to the second interface 15, i.e. the transmission of the second transmission signal T2 in the medium between the second interface 15 and the antenna array 10 (ambient medium layer 13 and first layer 11) has an optimal penetration capacity.
In an exemplary embodiment, the user (for example, a measuring person) inputs parameters of the radar signal at the beginning of the measurement, for each sectional configuration of the measured object. In another exemplary embodiment, a number of experiments are performed in advance to obtain a database of parameters of radar signals matching the interface of the cross section of the object under test 10, which are stored in the data processing and input output module 40. At the time of measurement, the user manually or the device automatically selects parameters of the first and second transmission signals T1 and T2 that match the first and second interfaces 14 and 15, respectively.
S200, the antenna 21 of the antenna array 20 is used to transmit the first transmission signal T1 to the measured object 10 and receive a first reflection signal R1, where the first reflection signal R1 is a signal reflected by the first interface 14 from the first transmission signal T1.
The same antenna 21 both transmits the first transmitted signal T1 and receives the first reflected signal R1 reflected from the point of the corresponding first interface 14.
S300, the chip 30 receives the first reflected signal R1 from the antenna 21, processes the first transmitted signal T1 and the first reflected signal R1, and converts the processed first reflected signal into a first digital signal for storage.
The first digital signal contains difference frequency information of the first reflected signal R1 and the first transmitted signal T1, which can be used for subsequent calculation of the distance between the point in the first interface 14 where the first transmitted signal T1 is transmitted and the antenna. The first digital signals corresponding to the distances between the respective points of the first interface 14 and the antenna 21 can be obtained by the same method.
S400, the antenna 21 of the antenna array 20 is used to transmit a second transmitting signal T2 to the measured object 10 and receive a second reflecting signal R2, wherein the second reflecting signal R2 is a signal reflected by the second interface 15 from the second transmitting signal T2;
The same antenna 21 both transmits the second transmitted signal T2 and receives the second reflected signal R2 reflected from the point of the corresponding second interface 15.
S500, the chip 30 receives the second reflected signal R2 from the antenna 21, processes the second transmitted signal T2 and the second reflected signal R2, and converts the second transmitted signal T2 and the second reflected signal R2 into a second digital signal for storage.
The second digital signal contains difference frequency information of the second reflected signal R2 and the second transmitted signal T2, which can be used for subsequent calculation of the distance between the point in the second interface 15 where the second transmitted signal T2 is transmitted and the antenna. The second digital signals corresponding to the distances between the respective points of the second interface 15 and the antenna 21 can be obtained by the same method.
Similarly, steps S200 and S300 may be repeatedly performed for each interface to obtain a corresponding digital signal containing the difference frequency information of the reflected signal and the corresponding transmitted signal of a point reflection of the interface.
S600, the data processing and input/output module 40 calculates a first distance H1 according to the first digital signal, calculates a second distance H2 according to the second digital signal, and then obtains a distance between the first interface 14 and the second interface 15 according to the first distance H1 and the second distance H2, wherein the first distance H1 is a distance between the first interface 14 and the antenna 21 of the antenna array 20, and the second distance H2 is a distance between the second interface 15 and the antenna 21 of the antenna array 20.
According to the method, each interface is scanned, radar signals (namely, transmitting signals) matched with the interface are transmitted, the corresponding reflected radar signals (namely, reflected signals) are received, the distance between each point of the interface and a corresponding antenna is further obtained, the distance between adjacent interfaces is further obtained, and the method is simple, convenient and fast in speed, and real-time measurement can be achieved.
In an exemplary embodiment of the method, each antenna 21 in the antenna array 20 transmits the first transmit signal T1 simultaneously/individually/cooperatively to obtain a first distance H1 between a plurality of points on the first interface 14 and corresponding antennas 21 in the antenna array 20;
each antenna 21 in the antenna array 21 transmits a second transmit signal T2 simultaneously/one by one/cooperatively to obtain a second distance H2 between a plurality of points on the second interface 15 and corresponding antennas 21 in the antenna array 20,
The data processing and input/output module 40 generates a two-dimensional/three-dimensional map of the cross section of the measured object 10 according to the first distances H1 between the plurality of points on the first interface 14 and the corresponding antennas 21 in the antenna array 20 and the second distances H2 between the plurality of points on the second interface 15 and the corresponding antennas 21 in the antenna array 20.
The method can conveniently, accurately and real-timely obtain the two-dimensional/three-dimensional graph of the section of the measured object.
In one exemplary embodiment, the object under test is one of the following: crystallizer casting powder, tundish covering agent, ladle steel slag, electric furnace steel slag, open-hearth steel slag, converter steel slag, paper in paper industry, paper pile in paper industry, substances in tanks in petrochemical industry, chemicals in tanks in chemical industry, chemicals in tanks in wastewater treatment industry, chemicals in tanks in food industry, storage substances in coal yards and mines, solid substances on conveyor belts, etc. The operating frequency of the measuring device is very wide, for example 10MHZ-20GHZ.
It should be understood that although the present disclosure has been described in terms of various embodiments, not every embodiment is provided with a single embodiment, and that this description is for clarity only, and one skilled in the art should recognize that the embodiments may be suitably combined to form other embodiments as would be understood by one skilled in the art.
The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. Array frequency modulation radar real-time section measuring device, its characterized in that, the section includes N interfaces, array frequency modulation radar real-time section measuring device includes:
an antenna array (20) for transmitting and receiving radar signals, the transmitted and received radar signals being a sequence of electromagnetic wave pulses of progressively varying frequency;
-a chip (30) capable of generating and adjusting the radar signals transmitted by each antenna (21) of the antenna array (20), receiving radar signals reflected by the interface of the section from the antenna (21), processing the transmitted radar signals and the received radar signals and converting them into digital signals for storage; and
A data processing and input/output module (40) capable of calculating, from said digital signals, the distance between the interface of said section and the antennas (21) of said antenna array (20) and/or the thickness of the layers of said section; and receiving parameters of N radar signals input by a user and transmitting to the chip (30) to generate the radar signals, wherein the N radar signals are respectively matched with the N interfaces, and each radar signal has optimal penetration capacity in a medium between the interface matched with the radar signals and the antenna array (20).
2. The array frequency modulated radar real time section measurement device according to claim 1, wherein the chip (30) comprises:
A radio frequency signal and local oscillation signal synthesizer (31) capable of synthesizing a radar signal and a local oscillation signal of radio frequency;
A transmit/receive isolator (32) which obtains the synthesized radar signal from the radio frequency signal and local oscillation signal synthesizer (31) and transmits to the antenna array (20), receives the reflected radar signal from the antenna array (20), and isolates the transmitted and received radar signals;
-an analog pre-low noise amplifier (33) which obtains the received radar signal from the transmit/receive isolator (32) and amplifies it;
A mixer (34) for obtaining the local oscillation signal from the radio frequency signal and local oscillation signal synthesizer (31), obtaining an amplified radar signal from the analog pre-low noise amplifier (33), and mixing the local oscillation signal and the amplified radar signal to obtain an intermediate frequency signal;
An intermediate frequency signal processor (35) which filters and amplifies the intermediate frequency signal;
-an analog-to-digital converter (36) converting the analog signal output by the intermediate frequency signal processor (35) into the digital signal;
-a digital memory (37) capable of storing said digital signals; and
A controller (38) capable of controlling the co-operation of the various devices in the chip (30).
3. The array fm radar real-time section measurement apparatus of claim 2, wherein said data processing and input output module (40) includes a data processing and imaging unit (41) capable of obtaining data from said digital memory (37) and calculating distances between respective interfaces of said section and antennas (21) of said antenna array (20) and forming two-dimensional/three-dimensional images of said section.
4. The array fm radar real-time section measurement apparatus of claim 3, wherein said data processing and input/output module (40) further comprises at least one interface that is one or more of a USB interface (42), a PROFINET interface (43), a wireless PLC interface (44), and a 4-20mA communication interface (45).
5. An array frequency modulated radar real time section measurement device according to claim 3, characterized in that the data processing and imaging unit (41) is further capable of receiving and storing parameters of radar signals matching respective interfaces of the object (10) under test; the radio frequency signal and local oscillation signal synthesizer (31) obtains parameters of the radar signal from the data processing and imaging unit (41) from the digital memory (37) to synthesize the radar signal at the radio frequency.
6. The array fm radar real-time profile measurement apparatus of claim 1, further comprising a first PCB (50), wherein said antenna array (20) and said chip (30) are integrated on said first PCB (50).
7. The array fm radar real-time profile measurement apparatus as claimed in claim 2, wherein said radio frequency signal and local oscillation signal synthesizer (31) comprises:
a radio frequency signal synthesizer (311) for synthesizing the radio frequency radar signal, wherein the radio frequency radar signal is a triangular wave or a sawtooth wave; and
A local oscillation signal synthesizer (312) for generating the local oscillation signal, the local oscillation signal being a sine wave signal of radio frequency.
8. A method of measuring a cross-section of an object under test using the apparatus of any one of claims 1-7, the cross-section of the object under test (10) comprising at least a first interface (14) and a second interface (15), the method comprising:
The data processing and input/output module (40) receives parameters of the radar signal input by a user and transmits the parameters to the chip (30) to generate the radar signal, wherein the radar signal comprises a first transmitting signal (T1) matched with the first interface (14) and a second transmitting signal (T2) matched with the second interface (15);
transmitting the first transmission signal (T1) to the measured object (10) by using an antenna (21) of the antenna array (20) and receiving a first reflection signal (R1), wherein the first reflection signal (R1) is a signal reflected by the first interface (14) by the first transmission signal (T1);
the chip (30) receives the first reflected signal (R1) from the antenna (21), processes the first transmitted signal (T1) and the first reflected signal (R1) and converts the first reflected signal into a first digital signal for storage;
Transmitting the second transmission signal (T2) to the measured object (10) by using an antenna (21) of the antenna array (20) and receiving a second reflection signal (R2), wherein the second reflection signal (R2) is a signal of the second transmission signal (T2) reflected by the second interface (15);
The chip (30) receives the second reflected signal (R2) from the antenna (21), processes the second transmitted signal (T2) and the second reflected signal (R2) and converts them into a second digital signal for storage;
The data processing and input/output module (40) calculates a first distance (H1) according to the first digital signal, calculates a second distance (H2) according to the second digital signal, and then obtains a distance between the first interface (14) and the second interface (15) according to the first distance (H1) and the second distance (H2), wherein the first distance (H1) is a distance between the first interface (14) and an antenna (21) of the antenna array (20), and the second distance (H2) is a distance between the second interface (15) and the antenna (21) of the antenna array (20).
9. The method according to claim 8, wherein each antenna in the antenna array (20) transmits the first transmission signal (T1) simultaneously/individually/cooperatively to obtain a first distance (H1) of a plurality of points on the first interface (14) from a corresponding antenna in the antenna array (20);
Transmitting said second transmission signal (T2) simultaneously/one by one/co-operatively to each antenna of said antenna array (20) to obtain a second distance (H2) of a plurality of points on said second interface (15) from a corresponding antenna of said antenna array (20),
The data processing and input/output module (40) generates a two-dimensional/three-dimensional map of the cross section of the measured object (10) according to a first distance (H1) between a plurality of points on the first interface (14) and corresponding antennas in the antenna array (20) and a second distance (H2) between a plurality of points on the second interface (15) and corresponding antennas in the antenna array (20).
10. The method according to claim 8, wherein the object under test (10) is one of the following: crystallizer casting powder, tundish covering agent, ladle steel slag, electric furnace steel slag, open-hearth steel slag, converter steel slag, paper in paper industry, paper pile in paper industry, substances in tanks in petrochemical industry, chemicals in tanks in chemical industry, chemicals in tanks in wastewater treatment industry, chemicals in tanks in food industry, storage substances in coal yards and mines, solid substances on conveyor belts.
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