CN106125031B - Radio frequency electric field probe checking device and system - Google Patents
Radio frequency electric field probe checking device and system Download PDFInfo
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- CN106125031B CN106125031B CN201610704127.0A CN201610704127A CN106125031B CN 106125031 B CN106125031 B CN 106125031B CN 201610704127 A CN201610704127 A CN 201610704127A CN 106125031 B CN106125031 B CN 106125031B
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Abstract
The invention provides a radio frequency electric field probe checking device and a system, wherein the device comprises: a signal generator arranged in the shell and a power supply part electrically connected with the signal generator; the outside of the shell is provided with a probe clamp matched with the radio frequency electric field probe and used for fixing the radio frequency electric field probe; the signal generator is used for sending out electromagnetic signals with preset frequency and preset power so as to generate stable electromagnetic fields at the position of the probe clamp. The invention can generate stable electromagnetic signals with specific frequency and specific power, improves the accuracy of checking the radio frequency electric field probe during the field test, and has simple structure and convenient carrying.
Description
Technical Field
The invention relates to the technical field of electromagnetism, in particular to a radio frequency electric field probe checking device and a radio frequency electric field probe checking system.
Background
The radio frequency electric field probe is an important component of an electromagnetic radiation monitor and is used for monitoring electromagnetic signals in the environment, and is generally composed of a dipole antenna, a detection diode and a high-resistance wire. Due to the influence of environmental conditions (such as electromagnetic interference, radiation, temperature, humidity, power supply and the like) and the influence of factors such as movement, vibration and the like, the electronic performance of the element can change after a period of use, and the monitoring result is influenced. To ensure accuracy of the monitoring results, it is necessary to perform a period check (specifically, a check performed between two verifications of the instrument in order to maintain the reliability of the calibration state of the device) on the rf field probe. And whether the radio frequency electric field probe meets the monitoring work requirement is determined through period checking, so that the quality of a monitoring result is ensured.
In the prior art, a GTEM cell is generally used in a laboratory to check a radio frequency electric field probe, namely, the radio frequency electric field probe is placed in the GTEM cell, the field intensity value in the GTEM cell is monitored, and the accuracy of probe measurement is evaluated according to the monitored field intensity value and the actual field intensity value. However, GTEM cells are bulky and cannot be carried and used in the field, limiting the field of verification. In addition, the system for verification using GTEM cells is expensive, greatly increasing the verification cost.
Therefore, in order to enable the period of checking the rf electric field probe of the electromagnetic radiation monitor in the field test, the prior art generally adopts a method of measuring the mobile phone signal to simply check the rf probe, however, in the process of implementing the present invention, the inventor finds that at least the following problems exist in the prior art: (1) The mobile phone signal is not a stable signal source, because the signal strength sent by the mobile phone is related to the state of the mobile phone, for example, whether the mobile phone is in a call or whether other operations (such as connecting to a network) are performed can affect the strength of the mobile phone signal, so that the stability of the mobile phone signal cannot be ensured; (2) The distance and the relative position between the mobile phone transmitting antenna and the detected probe cannot be fixed, and the electromagnetic wave can be attenuated in free space transmission, so that the probe monitors in different directions from the signal source, and the measured value difference can be quite large.
Aiming at the problem that the checking accuracy is poor due to more interference factors existing in the process of checking the radio frequency electric field probe of the electromagnetic radiation monitor by applying the mobile phone signal in the field test, no effective solution is proposed at present.
Disclosure of Invention
Accordingly, an object of the embodiments of the present invention is to provide a device and a system for checking a radio frequency electric field probe, which can eliminate the conventional method of checking a radio frequency electric field probe by using a mobile phone signal in field test of technicians, and greatly improve the accuracy of checking the radio frequency electric field probe during the period by generating electromagnetic signals with specific frequency and specific power by the device for checking the radio frequency electric field probe capable of generating stable electromagnetic fields.
In a first aspect, an embodiment of the present invention provides a radio frequency electric field probe checking device, including: a signal generator arranged in the shell and a power supply part electrically connected with the signal generator; the outside of the shell is provided with a probe clamp matched with the radio frequency electric field probe and used for fixing the radio frequency electric field probe; the signal generator is used for sending out electromagnetic signals with preset frequency and preset power so as to generate stable electromagnetic fields at the position of the probe clamp.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the signal generator includes: the local oscillation module is used for generating and sending out electromagnetic signals with preset frequency; the filter is connected with the local oscillation module and is used for receiving the electromagnetic signal, filtering the electromagnetic signal and outputting the filtered electromagnetic signal; the signal amplifier is connected with the filter and is used for receiving the filtered electromagnetic signal, carrying out voltage amplification on the filtered electromagnetic signal according to a set voltage amplification factor and outputting the electromagnetic signal after voltage amplification; the power amplifier is connected with the signal amplifier and is used for receiving the electromagnetic signal after voltage amplification, carrying out power amplification on the electromagnetic signal after voltage amplification according to the amplification factor corresponding to the preset power and outputting the electromagnetic signal after power amplification; and the antenna is connected with the power amplifier and is used for transmitting electromagnetic signals output by the power amplifier.
With reference to the first possible implementation manner of the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where the signal generator further includes: a power monitor connected with the power amplifier and a main controller respectively connected with the power monitor and the signal amplifier; the power monitor is used for monitoring power data of electromagnetic signals output by the power amplifier in real time and outputting the power data to the main controller; the main controller adjusts the voltage amplification times of the signal amplifier in real time according to the power data so that the power amplifier outputs electromagnetic signals with preset power.
With reference to the second possible implementation manner of the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, where the local oscillation module includes: the frequency bands corresponding to the local oscillation circuits are different from each other; the filter comprises a plurality of sub-filters which are connected with a plurality of local oscillation circuits in a one-to-one correspondence manner, and each local oscillation circuit and the corresponding sub-filter form a branch; the main controller is also respectively connected with a plurality of sub-filters and used for controlling the opening and closing of the branch circuits.
With reference to the second possible implementation manner of the first aspect, the embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where the device further includes a control key, where the control key is connected to the master controller, and is configured to preset a frequency and a power of the electromagnetic signal sent by the signal generator.
With reference to the second possible implementation manner of the first aspect, the present embodiment provides a fifth possible implementation manner of the first aspect, wherein an orientation of the probe fixture disposed outside the housing is related to a direction of the antenna; and the probe clamp is an embedded groove for embedding the radio frequency electric field probe.
With reference to the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where the power supply unit includes a rechargeable battery and/or a power interface, and the power interface is configured to connect to an external power source through a power cord.
With reference to the second possible implementation manner of the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, where an indicator light is further disposed outside the housing; the indicator lamp is respectively connected with the main controller and the power supply component; the indicator lamp comprises a charging indicator lamp and a working indicator lamp.
With reference to the first aspect, an embodiment of the present invention provides an eighth possible implementation manner of the first aspect, where the device further includes a display screen, where the display screen is connected to the signal generator, and is configured to display a parameter value of an electromagnetic signal sent by the signal generator; wherein, the display screen includes: a liquid crystal display, an LED display, an LCD display, or a touch display.
In a second aspect, an embodiment of the present invention further provides a radio frequency electric field probe checking system, where the system includes the radio frequency electric field probe checking device of the first aspect, and further includes an electromagnetic radiation monitor; the radio frequency electric field probe of the electromagnetic radiation monitor is matched with the probe clamp.
The embodiment of the invention provides a radio frequency electric field probe checking device and a radio frequency electric field probe checking system, which can generate electromagnetic signals with preset frequency and preset power by arranging a signal generator; the probe clamp matched with the radio frequency electric field probe is arranged outside the device, so that the probe can be well fixed, and the positions of the probe and an antenna for transmitting electromagnetic signals can be fixed. Compared with the prior art that the electromagnetic radiation monitor is subjected to the detection during the process of using the mobile phone signal to carry out the radio frequency electric field probe of the electromagnetic radiation monitor, and the detection has more interference factors (such as unstable mobile phone signal, unstable relative position of the mobile phone antenna and the probe, and the like), and the detection accuracy is poor, the embodiment of the invention can generate a stable electromagnetic field, and send out electromagnetic signals with specific frequency and specific power to carry out the detection of multiple performances of the radio frequency electric field probe, thereby greatly improving the accuracy and the reliability of the detection during the process of carrying out the radio frequency electric field probe.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic structural diagram of a radio frequency electric field probe checking device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a signal generator according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another signal generator according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another signal generator according to an embodiment of the present invention;
FIG. 5 shows the specific dimensions of a radio frequency electric field probe checking device provided by an embodiment of the present invention;
fig. 6 shows a schematic diagram of a back structure of a radio frequency electric field probe checking device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a radio frequency electric field probe checking system according to an embodiment of the present invention;
FIG. 8 illustrates a line graph reflecting the frequency response of a radio frequency probe provided by an embodiment of the present invention;
FIG. 9 illustrates a line graph reflecting the frequency response of a radio frequency probe provided by an embodiment of the present invention;
FIG. 10 illustrates a line graph reflecting the linearity of a radio frequency probe provided by an embodiment of the present invention;
FIG. 11 shows a line graph reflecting isotropy of a radio frequency probe provided by an embodiment of the present invention;
illustration of:
100-housing 200-signal generator
300-probe clamp 401-charging indicator lamp
402-work indicator 501-power interface
502-rechargeable battery 600-switch
210-local oscillation modules 211, 212 and 213-local oscillation circuit
220-filters 221, 222, 223-sub-filters
230-Signal Amplifier 240-Power Amplifier
250-Power monitor 260-Master
1-radio frequency electric field probe checking device 2-radio frequency electric field probe
3-monitor host
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
In consideration of the problem that in the prior art, during the process of checking the radio frequency electric field probe of the electromagnetic radiation monitor by using a mobile phone signal in the field test, interference factors (such as unstable mobile phone signal, unstable relative position of a mobile phone antenna and the probe and the like) are more, so that the checking accuracy is poor, the embodiment of the invention provides a radio frequency electric field probe checking device and a radio frequency electric field probe checking system, which can generate a stable electromagnetic field, send out electromagnetic signals with specific frequency and specific power to check the performance of the radio frequency electric field probe in multiple aspects, and effectively improve the accuracy and the reliability of checking the radio frequency electric field probe during the process. The structure is simple, the portable radio frequency probe is convenient to carry, and the radio frequency probe can be checked in the field period in various occasions. The following is a detailed description of the embodiments.
Example 1
The embodiment of the invention provides a radio frequency electric field probe checking device, referring to a structural schematic diagram of the radio frequency electric field probe checking device shown in fig. 1, the device comprises: a signal generator 200 disposed inside the housing 100, and a power supply part electrically connected to the signal generator 200;
the outside of the housing 100 is provided with a probe holder 300 matched with the rf electric field probe for fixing the rf electric field probe;
the signal generator 200 is used for emitting an electromagnetic signal of a preset frequency and a preset power to generate a stable electromagnetic field at the position of the probe holder 300.
The radio frequency electric field probe checking device can generate electromagnetic signals with preset frequency and preset power by arranging the signal generator; the probe clamp matched with the radio frequency electric field probe is arranged outside the device, so that the probe can be well fixed, and the positions of the probe and an antenna for transmitting electromagnetic signals can be fixed; the device has simple structure and convenient carrying, and can be applied to various outdoor occasions for field test. In summary, the radio frequency electric field probe checking device provided by the embodiment of the invention can generate a stable electromagnetic field and send out electromagnetic signals with specific frequency and specific power to check the performance of the radio frequency electric field probe in multiple aspects, thereby greatly improving the accuracy and reliability of checking the radio frequency electric field probe during the period.
In a specific application, referring to a schematic structural diagram of the signal generator shown in fig. 2, the signal generator includes:
the local oscillation module 210 is configured to generate and send out an electromagnetic signal with a preset frequency;
the filter 220 is connected to the local oscillation module 210, and is configured to receive the electromagnetic signal, filter the electromagnetic signal, and output a filtered electromagnetic signal;
a signal amplifier 230 connected to the filter 220, for receiving the filtered electromagnetic signal, voltage amplifying the filtered electromagnetic signal according to a set voltage amplification factor, and outputting a voltage amplified electromagnetic signal;
the power amplifier 240 is connected with the signal amplifier 230, and is configured to receive the electromagnetic signal after voltage amplification, power amplify the electromagnetic signal after voltage amplification according to an amplification factor corresponding to a preset power, and output the electromagnetic signal after power amplification;
an antenna coupled to the power amplifier 240 for transmitting the electromagnetic signal output by the power amplifier.
The signal generator can obtain electromagnetic signals with preset frequency through the local oscillation module; and then filtering the signal through a filter, amplifying the voltage of the signal through a signal amplifier and the like, generating an electromagnetic signal with preset power through the power amplifier, and sending the electromagnetic signal with preset frequency and preset power through an antenna. Compared with the uncertainty of the mobile phone signal, the signal generator provided by the embodiment can generate electromagnetic signals with specific frequency and power according to actual requirements, and is stable.
Further, in consideration of that the power of the electromagnetic signal emitted by the antenna may deviate from the actual preset electromagnetic signal power, and is not very accurate, in order to obtain a relatively accurate electromagnetic signal with preset power, as shown in fig. 3, the signal generator may further include a power monitor 250 connected to the power amplifier 240, and a main controller 260 connected to the power monitor 250 and the signal amplifier 230, respectively, on the basis of fig. 2;
the power monitor 250 is configured to monitor power data of the electromagnetic signal output by the power amplifier 240 in real time, and output the power data to the main controller 260; the main controller 260 adjusts the voltage amplification factor of the signal amplifier 230 in real time according to the power data, so that the power amplifier 240 outputs an electromagnetic signal having a preset power.
The power of the electromagnetic signal output by the antenna is monitored in real time through the power monitor, relevant power data are fed back to the main controller, and the main controller adjusts the amplification factor of the signal amplifier according to actual conditions until the electromagnetic signal monitored by the power monitor can reach specific power (namely preset power), so that the radio frequency electric field probe checking device is further ensured to be more accurate in checking.
Checking the frequency response performance of the rf electric field probe requires detecting the probe by using a plurality of electromagnetic signals with different frequencies, and in order to make the result more representative, frequencies with different frequency bands are generally selected as preset frequencies. In view of the fact that the frequencies generated by the individual local oscillation circuits are usually only in a certain frequency band, in order to make the frequency range span large, a plurality of local oscillation circuits can be adopted for realizing, and the filtering frequency bands of different filters are different, so that the filters corresponding to the frequency bands of the local oscillation circuits also need to be arranged. Therefore, the local oscillation module comprises a plurality of local oscillation circuits, and the frequency bands corresponding to the local oscillation circuits are different from each other; the filter comprises a plurality of sub-filters which are connected with a plurality of local oscillation circuits in a one-to-one correspondence manner, and each local oscillation circuit and the corresponding sub-filter form a branch; meanwhile, the main controller is also respectively connected with the plurality of sub-filters and used for controlling the opening and closing of the branch circuits. Specifically, referring to fig. 4, only 3 local oscillator circuits including the local oscillator circuit 211, the local oscillator circuit 212, and the local oscillator circuit 213, and 3 sub-filters including the sub-filter 221, the sub-filter 222, and the sub-filter 223 are shown in the figure, and a plurality of local oscillator circuits and sub-filters can be correspondingly set according to actual requirements, which are not described herein.
By adopting a mode of a plurality of local oscillator circuits, electromagnetic signals with larger frequency span can be generated, so that the corresponding checking result of the frequency of the probe is more credible. In the specific implementation process, the control can be performed by adopting a multi-way switch, and only one branch is connected in one test, so that the description is omitted. Of course, if the frequency band required for checking the probe can be realized by one local oscillator circuit, only one local oscillator circuit and one filter are arranged in the signal generator.
In order to facilitate the setting of the frequency, power, etc. of the required electromagnetic field by the user, the checking device may further comprise a control key, and the control key is connected with the master controller and is used for presetting the frequency and power of the electromagnetic signal sent by the signal generator, so that the signal generator sends the electromagnetic signal required by the user.
The radio frequency electric field probe checking device has the performance of checking the radio frequency probe, including isotropy, namely reflecting the consistency of measurement results of the omnidirectional probe in different directions; referring again to fig. 1, the orientation of the probe holder disposed outside the housing is related to the orientation of the antenna; and the probe clamp is an embedded groove for embedding the radio frequency electric field probe.
According to the empirical value, the included angle between a dipole antenna (placed in a sphere at the upper end of the probe) and a high-resistance wire (placed in a supporting rod of the probe) of the probe is 54.7 degrees, in practical application, a special probe clamp of the checking device fixes the checked probe at a position with an included angle of 54.7 degrees with the antenna transmitting direction, and the specific size of the radio frequency electric field probe checking device shown in fig. 5 can be seen, and the axis of the probe clamp and the shell are in a transverse direction of 54.7 degrees; the device has the total length of 30cm and the longitudinal width of 7.6cm, and is very small and portable. In practical application, the radio frequency electric field probe checking device can be manufactured with reference to fig. 5, and the size or the shape of the radio frequency electric field probe checking device can be flexibly changed according to requirements, and the radio frequency electric field probe checking device is not described herein.
Because the radio frequency electric field probe checking device provided by the embodiment is portable, the checking device needs to be ensured to maintain the electric quantity outdoors so as to work normally, and therefore, in a specific application, the power supply component can be realized in a form of a rechargeable battery and/or a power supply interface, wherein the power supply interface can be used for connecting an external power supply through a power supply wire. Reference may be made to the power interface 501 shown in fig. 1 and the rechargeable battery 502 in the schematic diagram of the back structure of a radio frequency electric field probe checking device shown in fig. 6, respectively, where the rechargeable battery 502 may be disposed at the bottom of the checking device, specifically at the back of a signal generator (not shown in the figure), and the power interface may be disposed at the side of the checking device, where the power interface is connected to the signal generator and the rechargeable battery inside the device. When the external power supply can be provided in the application occasion, the device can be connected with the external power supply through the power interface, and can charge the rechargeable battery while using electricity; when no external power supply exists, the device can be powered by the rechargeable battery, so that the device is flexibly applicable to various occasions.
In addition, in order to make the user clearly know the state of the checking device, an indicator light is arranged outside the shell; the indicator lamp can be respectively connected with the main controller and the power supply component; the indicator lamps include a charge indicator lamp 401 and a work indicator lamp 402, as shown in fig. 1.
Also shown in fig. 1 is a switch 600 of the device for controlling the opening or closing of the device.
Further, the apparatus may further comprise a display screen connected to the signal generator for displaying parameter values of the electromagnetic signal emitted by the signal generator, wherein the display screen comprises: a liquid crystal display, an LED display, an LCD display, or a touch display. It should be noted that if the display is touched, the user can directly set the frequency and power values of the desired electromagnetic field by touching the display, and no control keys are needed.
The device provided by the embodiment can generate a stable electromagnetic field, and send out electromagnetic signals with specific frequency and specific power to check the performance of the radio frequency electric field probe in multiple aspects, so that the accuracy and the reliability of checking the radio frequency electric field probe in the period are greatly improved; and the structure is simple, the portable is suitable for carrying out field test on the radio frequency probe in various occasions.
Example 2
For the rf electric-field probe checking device provided in embodiment 1, an embodiment of the present invention provides an rf electric-field probe checking system, referring to a schematic structural diagram of an rf electric-field probe checking system shown in fig. 7, where the system includes the rf electric-field probe checking device 1 provided in embodiment 1, and further includes an electromagnetic radiation monitor; wherein the radio frequency electric field probe 2 of the electromagnetic radiation monitor is matched with the probe clamp. The electromagnetic radiation monitor specifically comprises a radio frequency electric field probe 2 and a monitor host 3. The probe holder of the rf electric field probe checking apparatus 1 shown in fig. 7 is engaged with the rf electric field probe 2.
Through jogging the probe of electromagnetic radiation monitor and the probe anchor clamps of radio frequency electric field probe inspection device, can fix the probe with the antenna position of signal generator in the inspection device, this antenna can produce stable electromagnetic field in probe position department simultaneously, and the frequency and the power of this electromagnetic field can be preset according to the needs of checking, synthesize and realize checking the period of radio frequency electric field probe, consequently the radio frequency electric field probe inspection system accuracy and the reliability that this embodiment provided are higher.
The rf electric field probe checking system provided in this embodiment has the same implementation principle and technical effects as those of the foregoing embodiment, and for brevity, reference may be made to the corresponding contents of the foregoing embodiment where no mention is made in this section.
Example 3
In combination with the foregoing embodiments, the present embodiment provides a specific application of the rf electric field probe apparatus provided in embodiment 1 to checking the rf electric field probe during the period.
Referring again to fig. 7, during the checking, it is first determined that the rf probe is well connected with the monitor host, and then the rf probe is put into a special probe fixture of the checking system, and since the rf probe is usually used in the rf test, the probe is checked during the period in the range of 800MHz-3GHz, and the performance of the rf electric field probe device for checking the rf probe includes frequency response, linearity and isotropy.
(1) Frequency response
The frequency response is the consistency of the response of the probe to signals with different frequencies, and the smaller the difference of the measured values of the probe to the signals with different frequencies is, the better the performance is.
When the frequency response is checked, the local oscillator generates signals with different frequencies, and the signals with different frequencies are amplified by the amplifier to make the power of the signals with different frequencies identical, i.e. the measured values of the checked probe on the signals with different frequencies are theoretically consistent. In practice, the probe will always have a difference in measurement of signals of different frequency magnitudes, which difference reflects the frequency response characteristics of the probe. The frequency response characteristics of the probe are typically measured using a three-point method. As shown in fig. 8, the local oscillator generates signals of 3 frequencies in total, f1, f2 and f3, and the electric field intensity generated in the probe clamp is the same by the control of the signal amplifier by the main control unit. The detected values of the probe to be checked at the three frequency points are not identical. And the frequency response characteristic of the checked probe can be obtained by evaluating the difference between the actual measured value and the theoretical measured value.
Based on the above-mentioned checking principle of frequency response, three frequency points of 900MHz, 1.8GHz and 2.45GHz are selected for checking in this embodiment. Because the frequency points are distributed, the signal generator needs to use three local oscillators to generate the three frequency point signals. Accordingly, three filters are needed to achieve filtering. The structural diagram of the signal generator is shown again in fig. 4.
The amplification factor of the signal amplifier is regulated by the main controller, so that the theoretical value of the signal electric field intensity of each frequency is 4V/m. The frequency response curve obtained by actual detection can be seen in fig. 9, so that the frequency response performance of the radio frequency probe can be determined based on the frequency response curve.
(2) Linearity of
Linearity is the degree to which the probe measurement increases linearly proportionally as the measured signal field strength increases linearly proportionally. The better the measurement is linearly proportional to the degree of increase, the better the probe performance.
When linearity is checked, the main control unit controls the signal amplifier to amplify the signals with different amplification factors, so that theoretical measured values of the checked probes on the signals are increased linearly in proportion, such as 1V/m, 5V/m and 10V/m, and actual measured values of the checked probes are possibly increased in non-linear and non-proportional manners, such as 1.5V/m, 4.8V/m and 10.7V/m. And the linearity of the checked probe can be obtained by evaluating the difference between the actual measured value and the theoretical measured value.
Based on the principle of checking linearity, in this embodiment, signals of 1.8GHz frequency points are selected to check the probe, and by adjusting the signal amplifier, ideal measurement values of the probe are 1V/m, 5V/m and 10V/m respectively, and actual measurement values of the checked probe are 1.5V/m, 4.8V/m and 10.7V/m, so that a line diagram shown in fig. 10 is made, and the linearity performance of the radio frequency probe can be determined according to the line diagram.
(3) Isotropy
Isotropy is the consistency of measurement results of an omni-directional probe in different directions. The radio frequency probe realizes omnidirectional measurement of the probe through three mutually perpendicular dipole antennas (positioned in the probe).
Specifically, three dipole antennas can be set to be respectively located on X, Y, Z axes, X, Y, Z axes are mutually perpendicular, and included angles between the three dipole antennas and the high-resistance line are 54.7 degrees. The special probe clamp of the radio frequency electric field probe checking device provided by the embodiment can fix the tested probe at the position with an included angle of 54.7 degrees with the radiation direction of the antenna, the three dipole antennas are sequentially directed to the radiation direction of the antenna by rotating the probe, when the dipole antennas are directed to the radiation direction of the antenna of the signal generator, the measured value of the dipole antennas is determined theoretically, and the isotropy characteristic of the probe can be evaluated by comparing the actual measured values of the three dipole antennas.
In the actual checking, the probe supporting rod is taken as an axis, the probe is rotated for 360 degrees, meanwhile, the measured value of the monitor host is observed, and three maximum values are found, namely the actual measured values of three dipole antennas respectively positioned in the X, Y, Z axis direction.
Based on the isotropy checking principle, the embodiment selects a 900MHz frequency point for checking, and the checked probe is rotated to measure the measured values when the X axis, the Y axis and the Z axis are respectively pointed to the transmitting direction of the antenna. Theoretical measured values of the X axis, the Y axis and the Z axis are all 4V/m. The broken line drawn according to the actual measured value is shown in fig. 11, and the isotropy characteristic of the radio frequency probe can be determined according to the broken line.
In summary, compared with the problems existing in the prior art, the device and the system for checking the radio frequency electric field probe provided by the embodiment of the invention have the following characteristics and advantages:
(1) The stable signal source is generated by the signal generator, so that the signal source is more stable than the mobile phone signal;
(2) The relative positions (including distance, azimuth, angle and the like) of the measured probe and the antenna of the signal generator can be fixed through the probe clamp, so that the signal generator generates a stable electromagnetic field at the position of the measured probe; and the distance between the antenna of the signal generator and the checked probe can be determined, so that the theoretical measured value of the probe can be determined and calculated.
(3) The multiple local oscillators in the signal generator can generate signals with different frequencies, and meanwhile, the master controller in the signal generator can adjust the amplification factor of the signal amplifier according to the feedback result of the power monitor, so that the electromagnetic intensities of the signals with different frequencies at the probe are the same, and the frequency response characteristic of the probe is checked. Namely: the signal generator may generate electromagnetic signals of a plurality of specific frequency points and of the same field strength amplitude at the probe clamp. The frequency response test of the probe is usually performed by a three-point method, preferably 900MHz, 1.8GHz and 2.45GHz.
(4) The signal generator is used for generating field strengths with different amplitudes at the position of the detected probe for measuring the linearity of the probe. And the amplification factor of the amplifier is regulated by utilizing the control of the master controller on the signal amplifier, so that a signal with specific strength is generated. Meanwhile, signals of multiple electric field intensity levels can be generated at the detected probe through multiple times of amplification factor adjustment, so that the linearity of the probe is checked.
(5) The probe clamp is arranged outside the shell and is directed in relation to the direction of the antenna, according to the characteristic that the included angle between the dipole antenna of the probe and the high-resistance wire is 54.7 degrees, in practical application, the special probe clamp of the checking device fixes the checked probe at the position with the included angle of 54.7 degrees with the antenna transmitting direction, so that the dipole antenna in three directions inside the probe can sequentially point to the transmitting direction of the signal generator antenna by rotating the probe around the high-resistance wire (placed in the supporting rod of the probe), and isotropy checking of the probe is realized.
(6) Compared with the problems that the GTEM cell is huge in size, not easy to carry and high in price, the checking device is small in size and convenient to carry, is convenient to check the probe at any time and any place, and greatly reduces the cost.
It should be noted that like reference numerals and letters refer to like items in the above figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in subsequent figures.
Further, in the description of the present invention, the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, in the description of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A radio frequency electric field probe checking device, comprising: a signal generator arranged in the shell and a power supply part electrically connected with the signal generator;
the outside of the shell is provided with a probe clamp matched with the radio frequency electric field probe and used for fixing the radio frequency electric field probe;
the signal generator is used for sending out electromagnetic signals with preset frequency and preset power so as to generate a stable electromagnetic field at the position of the probe clamp;
the signal generator includes:
the local oscillation module is used for generating and sending out electromagnetic signals with preset frequency;
the filter is connected with the local oscillation module and is used for receiving the electromagnetic signals, filtering the electromagnetic signals and outputting the filtered electromagnetic signals;
the signal amplifier is connected with the filter and is used for receiving the electromagnetic signals after filtering, carrying out voltage amplification on the electromagnetic signals after filtering according to the set voltage amplification factor and outputting the electromagnetic signals after voltage amplification;
the power amplifier is connected with the signal amplifier and is used for receiving the electromagnetic signal after voltage amplification, carrying out power amplification on the electromagnetic signal after voltage amplification according to the amplification factor corresponding to the preset power and outputting the electromagnetic signal after power amplification;
the antenna is connected with the power amplifier and is used for transmitting electromagnetic signals output by the power amplifier;
the local oscillation module comprises: the frequency bands corresponding to the local oscillation circuits are different from each other;
the filter comprises a plurality of sub-filters which are connected with a plurality of local oscillation circuits in a one-to-one correspondence manner, and each local oscillation circuit and the corresponding sub-filter form a branch;
the signal generator further comprises: a power monitor connected to the power amplifier, and a master controller connected to the power monitor and the signal amplifier, respectively;
the main controller is also respectively connected with the plurality of sub-filters and used for controlling the opening and closing of the branch circuits.
2. The apparatus of claim 1, wherein the power monitor is configured to monitor power data of the electromagnetic signal output by the power amplifier in real time and output the power data to the master;
and the main controller adjusts the voltage amplification times of the signal amplifier in real time according to the power data so that the power amplifier outputs electromagnetic signals with the preset power.
3. The device of claim 2, further comprising a control key coupled to the master controller for presetting the frequency and power of the electromagnetic signals from the signal generator.
4. The apparatus of claim 2, wherein an orientation of the probe clamp disposed outside the housing is related to a direction of the antenna; and the probe clamp is an embedded groove for embedding the radio frequency electric field probe.
5. The device according to claim 1, wherein the power supply means comprises a rechargeable battery and/or a power interface for connecting an external power source via a power cord.
6. The device according to claim 2, wherein an indicator light is further provided outside the housing; the indicator lamp is respectively connected with the main controller and the power supply component; the indicator lamp comprises a charging indicator lamp and a working indicator lamp.
7. The device according to claim 1, further comprising a display screen connected to the signal generator for displaying parameter values of the electromagnetic signal emitted by the signal generator; wherein, the display screen includes: a liquid crystal display, an LED display, an LCD display, or a touch display.
8. A radio frequency electric field probe checking system, characterized in that the system comprises the radio frequency electric field probe checking device according to any one of claims 1 to 7, and further comprises an electromagnetic radiation monitor; the radio frequency electric field probe of the electromagnetic radiation monitor is matched with the probe clamp.
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