KR20150080452A - Calibration system and calibration method of the electric field probe module - Google Patents

Abstract

Provided in the present invention are a calibration system of an electric field probe module, and a calibration method using the system and, more specifically, to a calibration method of a wideband electronic wave monitoring device which is characterized by comprising the steps of: setting output of a signal generator outputting frequency power set upon sequence of a calibration table; measuring a power having the corresponding output in the signal generator radiated from an open TEM cell with a power meter; comparing measured power by comparing measurement measured in the power meter and the power table on a software program, and judging whether the measurement is in an error range; measuring probe module ADC value by measuring output ADC value in a probe module, when the measurement is in the error range in the measured power comparison step; and storing ADC average value averaging output ADC value in the probe module, and storing in a measurement table, thereby reducing difference caused by characteristic difference of components for each device of the probe module and assembly to have uniform measurement characteristics for each device, and selecting a method of making a function by dividing a section of 0.1-200 V/m upon characteristics of the devices into three to reduce the equipment costs for correction by increasing accuracy of the measurement, and thereby providing an effect of improving reliability of a measurement method.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a calibration system for an electric field probe module and a calibration method using the same,

The present invention relates to a calibration system of an electric field probe module and a calibration method using the system, and more particularly, to a calibration system of an electric field probe module in a broadband electromagnetic wave monitoring apparatus, And a probe module to be calibrated. The RF power of the power meter is monitored to adjust the output of a signal generator and a predetermined power table A function for calculating an electric field intensity from the collected ADC measurement values is read and stored in the probe module, and the measured value of the generated function is stored in the probe module. Of an electric field probe module in a broadband electromagnetic wave monitoring device It relates to a calibration method using a rib migration system and a system.

The electromagnetic monitoring system (system) is a system that continuously and periodically measures such electromagnetic waves against harmful electromagnetic waves, which are often generated in infrastructure and devices of various industries, especially mobile communication repeaters and transformers, It is a system which confirms whether or not the standard is abnormal.

It is important to determine whether the measuring instrument is displaying the correct numerical value and graduation prior to the measurement and whether the measuring instrument according to the given standard is performing the correct operation.

The field probe is a device that measures the electric field strength near the electromagnetic wave source using a small isotropic dipole antenna and a receiver. The probe device is a key element in electric field measurement, and it is essential that the probe has a minimal effect on the measurement circuitry and maintains signal fidelity to the desired measurement level.

The field probe is referred to as an electric field probe module or a probe module in the present invention.

Therefore, field probes of the electromagnetic monitoring system require calibration and verification to measure accurate field strength in a relatively wide frequency band.

Calibration is a term like calibration, which means to initialize all the settings before using the instrument and to make the state for optimal measurement.

The calibration of the electric field field probe is a process for reducing errors generated due to differences in used parts or assemblies of the measurement equipment in the measurement of the electromagnetic wave monitoring system to have constant measurement characteristics for each device.

However, in order to calibrate the field probe, it is necessary to have a test environment requirement that there is no electromagnetic interference effect such as electromagnetic wave interference or outdoor test site, and there is no reflection and coupling effect with other obstacles. However, There is a difficulty to bear the cost.

In addition, the setting of the technical standard and the measurement method of the calibration differ according to the conditions of various evaluation methods, and the interest and debate about the reliability of the measurement method is not unsteady.

The present invention relates to an electromagnetic wave monitoring apparatus disclosed in Korean Patent Publication No. 10-2013-0047000 by the present applicant and an effective calibration system of an electric field probe module used in a broadband electromagnetic wave monitoring apparatus based on the method and a system thereof This paper presents a calibration method using

KR Patent Application Publication No. 10-2013-0047000 (Feb.

In order to solve the above problems, an object of the present invention is to provide a broadband electromagnetic wave monitoring device which can effectively measure an electric field in a broadband electromagnetic wave monitoring system by calibrating and verifying an electric field probe module using an open transverse electromagnetic cell, A calibration system of a probe module and a calibration method using the system.

Another object of the present invention is to provide an electric field probe module comprising a dipole antenna, a diode, a high-resistance transmission line, an ADC (Analog Digital Converter), and a main control unit (MCU) A method of calibrating an electric field probe module in a broadband electromagnetic wave monitoring apparatus that effectively corrects a star deviation.

It is also an object of the present invention to provide a calibration program for an electric field probe module for an output value measured differently for each electromagnetic wave monitoring device in an electromagnetic environment of the same intensity by using a calibration program of an open tem- cell, A calibration method of an electric field probe module is provided.

Another object of the present invention is to provide a signal generator (Signal Generator) for dividing a period of 0.1 V / m to 200 V / m and forming an RF power suitable for each electric field intensity in an open TEM cell Generator) software that can read the measured ADC value of the electromagnetic monitoring device to automatically adjust and correct the output power of the generator and match the electric field intensity (V / m) to the ADC value through the outputted ADC value To provide a way to create a function.

Also, the present invention adopts a method of dividing the interval of 0.1 V / m to 200 V / m into three according to the diode characteristics, thereby improving the accuracy of the measured value of the input.

Also, the present invention provides a method of calibrating an electric field probe module in a broadband electromagnetic wave monitoring device by measuring the power so that the intensity of the electric field inputted to the electromagnetic wave monitoring device is inputted according to the set value, and controlling the output of the signal generator It has its purpose.

In order to achieve the above-mentioned object, the present invention provides a broadband electromagnetic wave monitoring apparatus comprising: a signal generator for generating a sinusoidal wave of a predetermined frequency; a power amplifier for increasing a frequency of a frequency output from the signal generator; A power meter for measuring the frequency power input to the open tem- meer, and a controller for controlling the oscillator in the broadband electromagnetic monitoring device, And a PC having a calibration module and a jig module for communicating the ADC value, which is input and output data of the probe module, with the PC. It provides a calibration system of the electric field probe module.

Also, the present invention is characterized by monitoring the power input to the power meter to specify the electric field intensity input to the open tem- plate, and adjusting the output power of the signal generator according to the monitor result.

According to another aspect of the present invention, there is provided a method of calibrating an electric field probe module of a broadband electromagnetic wave monitoring apparatus, the method comprising: inputting a loss value of a cable connected from an open cell to a power meter; Measuring power of the output of the signal generator from the open tem- perature with a power meter, comparing the measurement value measured by the power meter with a power table on the calibration program, and determining whether the output falls within an error range Comparing a measured power of the probe module with a measured power of the probe module; comparing the output ADC value of the probe module when the measured power is within an error range; and averaging output ADC values of the probe module, ADC It is to be made of a gyungap storing step to provide a calibration method of an electric field probe module.

According to another aspect of the present invention, in the step of measuring the ADC value of the probe module, an electric field intensity interval and an interval for measuring according to a diode characteristic of the probe module are 0.1 V / m to 1 V / m, 0.1 V / m, 1 V / m to 10 V / m is 1 V / m, and 10 V / m to 200 V / m is divided into 5 V / m intervals to measure the ADC value.

In the present invention, an electric field function is generated using the ADC values measured in the probe module ADC value measurement step, and only the ADC coefficients at electric fields of 1 V / m and 10 V / m are stored in the probe module And outputs the electric field strength measured by the stored coefficient and the ADC value at the time of actual operation.

Also, in order to reflect the characteristics of the logarithmic nonlinearity and linearity of the field strength of the ADC measurement value measured in the probe module ADC value measurement step, And a function generating step of obtaining a coefficient of the electric field function by a coefficient of the coefficient of linearity in the linearity section, wherein the function generating step includes the step of generating the coefficient generating function in the nonlinearity section in a range of 0.1 V / m to 1 V / m , And a coefficient of 1V / m to 10V / m and a coefficient generation function in a linearity interval is divided into a 10V / m to 200V / m interval and a coefficient is obtained .

The present invention provides a calibration system of an electric field probe module in a broadband electromagnetic wave monitoring apparatus and a calibration method using the system, and it is possible to reduce variations due to assembly of component parts of a probe module and assembly, And a software tool, which is a program for performing an automatic correction process, is used to facilitate correction.

In addition, the present invention has an effect of enhancing the accuracy of measured values for input by adopting a method of dividing the interval of 0.1 V / m to 200 V / m into three according to the characteristics of the apparatus.

The present invention also provides a calibration program for an electric field probe module, a signal generator, and a personal computer (PC) for calibrating an electric field probe module, thereby reducing the facility cost for calibration and improving the reliability of the measurement method.

1 is a configuration diagram of a calibration environment of an electric field probe module in a broadband electromagnetic wave monitoring apparatus according to an embodiment of the present invention;
2 is a flow chart of a calibration procedure of an electric field probe module in a broadband electromagnetic wave monitoring apparatus according to an embodiment of the present invention.
FIG. 3 is a graphical example of a graph measurement of a function made of an ADC value and an electric field intensity of 0.1 V / m to 1 V / m according to an embodiment of the present invention; FIG.
FIG. 4 is a graphical example of a function of a 1-V / m to 10-V / m section field strength and an ADC value according to an embodiment of the present invention. FIG.
FIG. 5 is a graphical example of a function of a 10V / m to 200V / m section field strength and an ADC value according to an embodiment of the present invention; FIG.
6 is a diagram illustrating an example of a calibration software program UI screen of an electric field probe module according to an embodiment of the present invention.
FIG. 7 is an input RF power chart according to an electric field strength calculated by Equation 3 and a measurement range of an interval of a calibration according to an embodiment of the invention; FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a calibration environment of an electric field probe module in a broadband electromagnetic wave monitoring apparatus according to an embodiment of the present invention.

The calibration environment of the electric field probe module in the broadband electromagnetic wave monitoring apparatus includes a signal generator 10, a power amplifier 20, an open TEM cell 30, An attenuator 40, a power meter 50, an electric field probe module 60, a jig module 70, and a calibration software program And a personal computer (PC)

The signal generator is a device for generating a sinusoidal wave of a set frequency, and its output power is adjusted by a PC's calibration software program.

Since the power amplifier can not output a signal from the signal generator as much as the RF power to be input to the open TEM cell, the power amplifier increases the RF power input to the open temcell.

The open tem- plate is a device having an endurance structure for generating an electric field of a uniform field with respect to an RF input output from the power amplifier. It is possible to use a closed TEM cell, but an open-temp cell is used to effectively eliminate the error of the reflected wave, to make a uniform electric field, and to reduce the measurement error.

The Attenuator is a device that lowers the RF output power level to protect the power meter from RF input of excessive power. Generally, an attenuator is widely used when it is required to lower the power level to a desired level, and is widely used for catching oscillation or reducing reflection loss.

The power meter measures RF power input to the open temples. Also, the electric field intensity can be measured through a spectrum analyzer device which is compatible with the power meter.

The electric field probe module is a target device to be calibrated in a broadband electromagnetic wave monitoring device.

The jig module is a device for converting a communication protocol so that an ADC value, which is input and output data of the probe module, can be communicated with a PC.

The PC is provided with a calibration software program of the present invention, and monitors the RF power value of the power meter to adjust the output of the signal generator, reads the ADC measurement value from the probe module according to a predetermined power table, It generates a function to calculate the field strength from ADC measurements and stores the coefficient value of the generated function in the probe module.

2 is a flow chart of a calibration procedure of an electric field probe in a broadband electromagnetic wave monitoring apparatus according to an embodiment of the present invention.

In order to calibrate the electric field probe module in a broadband electromagnetic monitoring device according to the city, enter the cable loss from the open temples to the power meter.

The cable loss input step S10 is a step of inputting the cable loss from the open tem- perature to the power meter as the spectral intensity measurement device as an initial value of the calibration software program.

This is because loss occurs due to the cable connected from the open tem- cell to the power meter. Therefore, it is necessary to compensate for the cable loss when reading the power meter measurement value from the PC. It is necessary to compensate the phase difference due to the cable length, Which is to say that the influence of

Next, the calibration is started in the UI (User Interface) window of the calibration software program on the PC as the start of the calibration (S11).

Next, in step S12 of setting the output of the signal generator, the calibration software program of the PC sets the output power of the signal generator according to the order of the power table, and the signal generator outputs the corresponding power.

The step of measuring the power meter (S13) is a step of measuring the power output of the dBm by measuring the output of the signal generator with the spectrum analyzer or the power meter.

The next step of comparing the measured power (S14) is a step of comparing the measurement value measured from the power meter in the power meter measurement (S13) with the RF Power Table on the calibration software program, and then determining whether the error falls within the error range. The tolerance of the tolerance is within ± 0.1dB.

If the power value of dBm measured from the power meter in step S14 is compared with the power table and deviates from the error range (± 0.1 dB), the output setting of the signal generator (S12) The power meter measurement (S13) is repeated to repeat the same procedure so as to fall within the error range in the measurement power comparison (S14).

The next step of measuring the ADC value (S15) is a step of measuring the output ADC value of the probe module by repeating 10 times when it enters the error range in the measured power comparison (S14).

Next, the ADC average value storing step S16 is a step of averaging the output ADC values of the probe module measured 10 times and storing the average ADC values in the measurement table.

Then, adjust the power output of the signal generator with the following table values of the power table and measure the ADC value of the probe module from 0.1V / m to 200V / m by repeating the same procedure. Then, according to the electric field intensity included in the calibration software program Repeat the process of reading and storing the ADC value measured in the probe module by changing power from low value to high value of RF Power Table.

An electric field is formed in the space around the magnetic field, which changes with time, and the charged object is subjected to an electric force. The electric field is the physical quantity first introduced by Faraday (Michael Faraday) and is called electric field or electric field. The electric field is usually represented by the symbol E, and is a vector quantity with magnitude and direction. Use N / C (newton per coulomb) or V / m (volt per meter) as the unit of the international standard unit system.

As described above, the electric field strength [E] is represented by E [V / m] = F / C, which represents the force F received by the unit charge C.

7 is an input RF power chart for each electric field strength calculated from Equation 1, which is calculated by calculating the electric field strength [E] with respect to the power P value of dBm measured from the power meter according to the calibration interval.

As shown in FIG. 7, the RF power table according to the electric field strength of the present invention has a range of 0.1 V / m to 1 V / m at intervals of 0.1 V / m, 1 V / m to 10 V / m at intervals of 1 V / The 200V / m section is subdivided into 5V / m intervals.

Equation 1 is an electric field strength equation formed relative to the RF power input to the open temples used. This is an equation in which the power value measured in dBm of the output RF power of the signal generator according to the section table is expressed by the electric field strength E (unit V / m).

[식 1]

[Formula 1]

The function generation step S19 is performed by dividing the ADC measurement average values of the measured probe modules by the intervals of 0.1 V / m to 1 V / m, 1 V / m to 10 V / m, and 10 V / m to 200 V / m, 3 to obtain the coefficients of the electric field functions such as the measurement coefficients a, b, and c.

Equation 2 is a function of the coefficient of nonlinearity in the range of 0.1V / m to 1V / m and 1V / m to 10V / m, and is a function formula of the intensity of the electromagnetic wave according to the measured ADC value.

[식 2]

[Formula 2]

Equation (3) is a function formula of the coefficient of linearity in the range of 10 V / m to 200 V / m and is a function formula of the intensity of the electromagnetic wave according to the measured ADC value.

[식 3]

[Formula 3]

FIG. 3 is a graph illustrating an example of graph measurement of a function of an electric field strength of 0.1 V / m to 1 V / m and an ADC value according to an embodiment of the present invention. FIG. 5 is a graph showing a graph of a function formed by an electric field strength of 10 V / m to 200 V / m and an ADC value. FIG.

As shown in FIGS. 3 and 4, the electric field intensity for the ADC measurement value is represented by the logarithmic nonlinearity graph in the range of 0.1 V / m to 1 V / m and 1 V / m to 10 V / m, And has a characteristic of being represented by a linearity graph in the range of 10 V / m to 200 V / m. Equation 1, Equation 2 and Equation 3 are coefficient generation functions applied to reflect these characteristics.

Next, the step of storing the count value (S20) is divided into the intervals of 0.1V / m to 1V / m, 1V / m to 10V / m and 10V / m to 200V / m from the measured ADC values, And the ADC values of 1V / m and 10V / m are stored in the probe module.

This completes the calibration of the RF electric field table from 0.1V / m to 1V / m, 1V / m to 10V / m, and 10V / m to 200V / m.

FIG. 6 is a view illustrating a UI (User Interface) screen of a calibration software tool of an electric field probe in a broadband electromagnetic wave monitoring apparatus according to an exemplary embodiment of the present invention. Referring to FIG. 6, the calibration of the electric field probe of the present invention is monitored, And controls and executes the calibration progress state.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. Accordingly, the technical scope of the present invention should be defined by the following claims.

10: Signal generator
20: Power Amp
30: Open TEM Cell
40: attenuator
50: Power meter
60: Probe Module
70: Jig Module
80: Personal computer (PC)

Claims (2)

A signal generator;
A power amplifier for increasing the power of the frequency output from the signal generator;
An open tem- plate for producing an electric field of uniform field with respect to a frequency input from the power amplifier;
A power meter for measuring the frequency power input to the open temples;
A probe module which is a device to be calibrated; And
And a communication module for communicating the ADC value, which is input and output data of the probe module, with the PC.
Calibration system for electric field probe module.
The method according to claim 1,
Wherein the controller is configured to monitor a power input to the power meter to specify an electric field intensity input to the open tem- plate, and to adjust an output power of the signal generator according to a monitor result
Calibration system for electric field probe module.

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