CN114137468A - Method and system for correcting field intensity measured by direct current electric field intensity detector - Google Patents
Method and system for correcting field intensity measured by direct current electric field intensity detector Download PDFInfo
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Abstract
The invention discloses a method and a system for correcting the field intensity measured by a direct current electric field intensity detector. The technical scheme adopted by the invention is as follows: measuring the electric field intensity of the detection environment by using a direct current electric field intensity detector; acquiring the relative humidity, the temperature and the air particulate matter concentration of the detection environment where the direct current electric field intensity detector is located; and correcting the electric field intensity measured by the direct current field intensity detector to obtain the actual field intensity in the detection environment according to the field intensity correction quantities under different relative humidity, temperature and air particulate matter concentrations obtained in advance and the relative humidity, temperature and air particulate matter concentration of the detection environment. The invention can reduce the influence of the relative humidity, temperature and air particle concentration of the environment on the direct current field strength measurement result, and improve the field strength measurement precision of the direct current field strength detector under the environment conditions of different humidity, air particle concentration and the like.
Description
Technical Field
The invention relates to the technical field of electric field intensity detection, in particular to a method and a system for correcting the field intensity detected by a direct current electric field intensity detector.
Background
The electric field intensity is an important index for evaluating the electromagnetic environment near the direct current transmission line. The direct current transmission line is located in an outdoor environment with changeable meteorological conditions such as temperature, humidity and air particulate matter concentration, and great difficulty is brought to accurate measurement of direct current electric field intensity.
The current-stage commonly used direct-current electric field intensity detector is a field mill type direct-current electric field intensity detector, and the working principle is as follows: when the direct current field intensity is measured, the shielding blade rotates at a high speed, the exposed area of the induction blade in a direct current electric field changes periodically, so that the induction charge quantity gathered on the surface of the induction blade also changes periodically, and an alternating induction current signal is generated; the DC electric field strength can be determined by detecting the corresponding signal. Because the probe of the direct current field intensity detector contains more metal parts, the change of the environmental temperature can cause the change of the metal resistivity, and further the measurement result of the electric field intensity is influenced. Environmental relative humidity changes can also affect the dc electric field strength measurements. Research has shown that when the relative humidity of the environment where the direct current electric field strength detector is located is greater than 80%, the electric field measurement error can reach 30%, and the measurement error increases with the increase of the relative humidity. In addition, the electric field exposure can lead to the air particulate matter (such as PM10) electrified, can lead to electrified particulate matter to adsorb at the metal probe when adopting direct current electric field intensity detector survey electric field intensity, and then causes the influence to the measurement accuracy of field intensity.
In order to correct the electric field strength measured by the electric field measuring device, patent publication No. CN112540240A discloses a temperature compensation system and method for measuring the electric field strength, which construct a first equation between humidity and temperature and a second equation between field strength and humidity by measuring humidity, temperature and field strength, and construct a relation equation between field strength and temperature by combining the first and second equations, thereby implementing temperature compensation of the electric field strength. However, the field intensity correction method of the existing direct current electric field intensity detector does not consider the influence of the concentration of the ambient air particles on the field intensity measurement. Therefore, it is necessary to provide a method and a system for correcting the field intensity measured by the dc electric field intensity detector, so as to reduce the influence of the ambient humidity, the temperature and the air particulate concentration on the measurement result of the dc field intensity.
Disclosure of Invention
The invention aims to provide a method and a system for correcting the field intensity measured by a direct current field intensity detector, which can solve the problem that the relative humidity, the temperature and the air particulate concentration of the environment have great influence on the field intensity measurement of the direct current field intensity detector in the prior art so as to improve the direct current field intensity measurement precision.
In order to achieve the purpose, the invention adopts a technical scheme that: the method for correcting the field intensity measured by the direct current field intensity detector comprises the following steps:
measuring the electric field intensity of the detection environment by using a direct current electric field intensity detector;
acquiring the relative humidity, the temperature and the air particulate matter concentration of the detection environment where the direct current electric field intensity detector is located;
and according to the field intensity correction values under different relative humidity, temperature and air particulate matter concentration acquired in advance and the relative humidity, temperature and air particulate matter concentration of the detection environment, obtaining the field intensity correction value corresponding to the detection environment, and correcting the electric field intensity detected by the direct current field intensity detector to obtain the actual field intensity in the detection environment.
Further, the field strength correction quantities obtained in advance under different relative humidities, temperatures and air particulate matter concentrations are obtained by the following steps:
1) placing a direct current electric field intensity detector at the center of a lower polar plate of a parallel polar plate direct current electric field generating device, wherein the height between a probe of the direct current electric field intensity detector and the lower polar plate is h; the parallel polar plate direct current electric field generating device comprises a high-voltage direct current power supply, an upper polar plate and a lower polar plate, a direct current voltage U is applied to the upper polar plate of the parallel polar plate direct current electric field generating device, and the lower polar plate is grounded, so that a stable uniform electric field is generated between the upper polar plate and the lower polar plate;
2) placing the parallel polar plate direct current electric field generating device in a sealed container with adjustable relative humidity, temperature and air particulate concentration;
3) fixing the temperature T in a sealed container1And air particulate matter concentration P1Respectively setting the relative humidity in the sealed container to be H1、H2、H3…HiI is the serial numbers of different relative humidities, and the different relative humidities H are respectively recordediField intensity reading E of lower direct current electric field intensity detectori11；
4) Maintaining the concentration P of the air particles in the step 3)1Respectively setting the temperature in the sealed container to be T2、T3、T4…TjJ is the number of different temperatures, TjNext, the relative humidities are set to H, respectively1、H2、H3…HiRespectively recording different relative humidities HiDifferent temperature TjField intensity reading E of lower direct current electric field intensity detectorij1；
5) Respectively setting the air particle concentration in the step 4) as P2、P3、P4…PkK is the number of different air particulate matter concentrations, and the step 4) is repeated under different air particulate matter concentrations to respectively record different relative humidities HiDifferent temperature TjDifferent air particulate matter concentration PkField intensity reading E of lower direct current electric field intensity detectorijk；
6) Setting the relative humidity in the sealed container as standard relative humidity, setting the temperature as normal temperature, setting the concentration of air particles as 0, and recording the field intensity reading E of the direct-current electric field intensity detectorSign board；
7) According to Δ Wijk＝Eijk-ESign boardNamely, field intensity correction quantity delta W under different relative humidity, temperature and air particulate matter concentration is calculatedijk。
Furthermore, in the parallel polar plate direct current electric field generating device in the step 1), the upper and lower polar plates are circular polar plates with the diameter of D, and the thickness of the polar plates is h0And the distance between the two polar plates is D, wherein D/D is less than 0.5.
Furthermore, the relative humidity, the temperature and the air particulate matter concentration in the sealed container in the step 1) are all adjustable, the temperature and the relative humidity in the container are regulated and controlled through a temperature and humidity controller, and the temperature and humidity controller is made of plastics except necessary metal parts and is far away from the parallel polar plate direct current electric field generating device.
Furthermore, the sealed container in the step 1) is a rectangular container made of acrylic plates, the relative humidity, the temperature and the air particulate concentration are all adjustable, and the air particulate concentration in the container is controlled by the following method: the upper top surface of the sealed container is provided with an opening which can be closed by a cover, and the mass m is measured through the openingkA particle diameter of d0Is poured into the plastic particles and sealedA container; when the plastic particles are uniformly suspended in the air, the concentration of the air particles in the container is according to Pk＝mkAnd v (abc), calculating to obtain k as the number of different air particle concentrations, and a, b and c as the length, width and height of the sealed container respectively.
Still further, since the plastic particles in the sealed container are difficult to completely remove, in order to improve the setting accuracy of the air particle concentration in the container, the air particle concentration in the container should be set from a low concentration to a high concentration in order, that is: the concentration of air particles in the container is PkAdding plastic particles with mass of delta m to set the concentration of air particles in the container to be Pk+1，Pk+1＝Pk+Δm/(abc)。
Furthermore, the plastic particles in the sealed container are uniformly suspended in the air in the following way: 2 fans with the same specification are respectively arranged on the lower bottom surface and the upper top surface of the sealed container, the fans are discontinuously started by taking a time interval delta T as a period, the duration time of each fan start is delta T, and delta T is less than delta T; during the starting period of the fan, the blades of the 4 fans are kept at the same and lower rotating speed, so that the air in the container flows at a speed of less than 2m/s, the field intensity detection time interval of the direct current electric field intensity detector is set, and the moment of reading the electric field intensity is positioned during the non-starting period of the fan.
Further, the method for determining the actual field strength in the detection environment is as follows: in the detection environment, the electric field intensity of the detection environment measured by the DC electric field intensity detector is Eread(ii) a Detecting field intensity correction quantity of delta W under the relative humidity, temperature and air particulate matter concentration of the environment; according to Eactual＝EreadΔ W, i.e. the actual field strength E in the detection environment is calculatedactual。
The other technical scheme adopted by the invention is as follows: correction system of direct current electric field intensity detector survey field intensity, it includes:
the electric field intensity detection unit is used for detecting the electric field intensity of the detection environment by adopting a direct current electric field intensity detector;
the influence factor acquisition unit is used for acquiring the relative humidity, the temperature and the air particulate matter concentration of the detection environment where the direct current electric field strength detector is located;
and the electric field intensity correction unit is used for obtaining the field intensity correction quantities under the relative humidity, the temperature and the air particulate matter concentration of the detection environment according to the field intensity correction quantities under different relative humidities, temperatures and air particulate matter concentrations which are obtained in advance and the relative humidity, the temperatures and the air particulate matter concentration of the detection environment, and correcting the electric field intensity measured by the direct current electric field intensity detector to obtain the actual field intensity in the detection environment.
Compared with the prior art, the invention has the beneficial effects that:
the method and the system for correcting the field intensity measured by the direct current field intensity detector can reduce the influence of the relative humidity, the temperature and the air particulate matter concentration of the detection environment on the direct current field intensity measurement result, and improve the field intensity measurement accuracy of the direct current field intensity detector under the environment conditions of different relative humidity, air particulate matter concentration and the like.
Drawings
FIG. 1 is a schematic flow chart illustrating the calculation of field strength correction at different relative humidities, temperatures, and air particulate concentrations according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a parallel-plate DC electric field generator and a sealed container according to an embodiment of the present invention;
labeled in fig. 2: 1. parallel pole plates; 2. a high voltage direct current power supply; 3. a wire; 4. an organic glass support; 5. sealing the container; 6. opening a hole with a cover; 7. a temperature and humidity controller; 8. a fan; 9. direct current electric field strength detector probe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the following embodiments and accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments without any inventive step, are within the scope of protection of the invention.
Example 1
In this embodiment, the field strength measurement result (field strength measurement result less than 50kV/m) of a certain electric field to be measured is corrected.
The method for correcting the field intensity measured by the direct current field intensity detector comprises the following steps:
s101, measuring the electric field intensity of a detection environment by using a direct current electric field intensity detector, wherein the direct current electric field intensity detector can be a field mill type direct current electric field intensity detector;
and S102, measuring the temperature, the relative humidity and the air particulate matter concentration of the environment where the direct current electric field intensity detector is located. Wherein, the temperature and the relative humidity can be measured by a temperature and humidity detector, and the concentration of air particles can be measured by a dust concentration detector;
s103, recording the electric field intensity (namely the data measured in the step S101) measured by the direct current electric field intensity detector in the detection environment as Eread(ii) a Obtaining field intensity correction quantity delta W of the detection environment according to field intensity correction quantities under different relative humidities, temperatures and air particulate matter concentrations, which are obtained in advance, and relative humidity H, temperature T and air particulate matter concentration P of the detection environment (namely data measured in step S102); according to Eactual＝EreadΔ W, i.e. the actual field strength E in the detected environment can be calculatedactual。
Referring to fig. 2, the field strength correction amounts at different relative humidities, temperatures and air particulate matter concentrations in S103 of the present embodiment are calculated according to the following steps:
s201, placing a direct current electric field intensity detector at the center of a lower polar plate of the parallel polar plate direct current electric field generating device, wherein the height between a probe of the field intensity detector and the lower polar plate is h. The parallel polar plate direct current electric field generating device comprises a high-voltage direct current power supply, an upper polar plate and a lower polar plate. Applying a DC voltage U to the upper plate
(0-50 kV), the lower polar plate is grounded, and a stable uniform electric field can be generated between the upper polar plate and the lower polar plate.
Specifically, the two polar plates of the parallel polar plate direct current electric field generating device are circular polar plates with the diameter D of 1.2m, and the thickness h of the polar plates0The distance D between the two polar plates is 0.5m and the D/D is less than 0.5 mm, so that the edge effect of the electric field distribution between the upper and the lower polar plates can be reduced, and a uniform electric field is generated at the center of the two polar plates. The upper and lower polar plates can be connected by a glass bracket.
S202, the parallel polar plate direct current electric field generating device is placed in a sealed container with adjustable relative humidity, temperature and air particulate matter concentration. The sealed container is a rectangular container (length is multiplied by width is multiplied by height is 3m multiplied by 3m) made of acrylic plates. The temperature (0-60 ℃) and the relative humidity (10% -90%) in the container are regulated and controlled through a temperature and humidity controller, and the temperature and humidity controller is far away from the parallel polar plate direct current electric field generating device.
The concentration of particulate matter such as PM10 (30-200 μ g/m) in the air in the container3) The control method comprises the following steps: a hole (the aperture is 2cm) which can be covered and sealed is arranged on the upper top surface of the sealed container; through the opening, the mass is mkPouring the plastic particles with the particle size of 10 mu m into a sealed container; when the plastic particles are uniformly suspended in the air, the concentration of PM10 in the container can be determined according to Pk＝mkAnd v (abc), wherein a, b and c are the length, width and height of the closed rectangular container. Since the plastic particles are difficult to completely remove after being poured into the sealed container, the PM10 concentration P is setk+1The set concentration P may remain in the containerkPlastic particles in time. To improve the accuracy of setting the concentration of PM10, the PM10 concentration in the container should be set from low concentration to high concentration in the order named, namely: the concentration of air particles in the container is Pk(k is a number of different PM10 concentrations), plastic particles having a mass Δ m are added so that the PM10 concentration in the vessel is set to Pk+1，Pk+1＝Pk+ Δ m/(abc), a, b, c are the length, width, height of the closed rectangular container.
Specifically, in order to enable plastic particles in the sealed container to be uniformly suspended in air, 2 fans with the same specification are respectively arranged on the lower bottom surface and the upper top surface of the sealed container, the fans are intermittently started with a time interval delta T (1 min) as a period, and the time interval of starting the fans every time is delta T (delta T is less than delta T, and delta T is 20 s). During the fan start-up, the blades are all kept at the same and low rotational speed, causing a slow (less than 2m/s) flow of air inside the container. Set up direct current electric field intensity detector's field intensity measurement time interval, every 30s reads electric field intensity, and the fan does not start when reading electric field intensity, and this can avoid blowing will originally adsorb the electrified plastic granules on metal probe and blow off, influences field intensity correction result. Besides metal parts required by electrification, blades, a shell and the like of the fan are made of plastics, so that the influence of the metal parts of the fan on an electric field between two polar plates can be reduced.
S203, fixing the temperature T in the sealed container1And PM10 concentration P1(minimum PM10 concentration for constructing a field Strength correction model, 30. mu.g/m3) The relative humidity in the container is set to H1、H2、H3…HiAnd i is the number of different relative humidities. The relative humidity control range is 10-90%. Recording different relative humidities H respectivelyiField intensity reading E of lower direct current electric field intensity detectori11。
S204, fixing the concentration P of PM10 in the sealed container1Setting the temperature in the container to T2、T3、T4…TjAnd j is the number of different temperatures. The temperature control range is 0-60 ℃. At different temperatures TjNext, the relative humidities are set to H, respectively1、H2、H3…HiAnd i is the number of different relative humidities. Recording different relative humidities H respectivelyiDifferent temperature TjField intensity reading E of lower direct current electric field intensity detectorij1。
S205, setting the concentration of PM10 in the sealed containers to be P2、P3、P4…PkAnd k is the number of different concentrations of PM 10. The concentration regulation range of PM10 is 30-200 μ g/m3. At different PM10 concentrations, step S204 is repeated. Recording different relative humidities H respectivelyiDifferent temperature TjDifferent PM10 concentration PkElectric field intensity E ofijkI, j and k are numbers of different relative humidity, different temperature and different PM10 concentration.
S206, setting the relative humidity in the sealed container as standard relative humidity (50%)Setting the temperature to be normal temperature (23 ℃), setting the concentration of air particles to be 0, and recording field intensity reading E of a direct current electric field intensity detectorSign board。
S207, according to Δ Wijk＝Eijk-ESign boardThen the field intensity correction quantity delta W under different humidity, temperature and air particulate matter concentration can be calculatedijk。
Referring to fig. 2, the parallel plate dc electric field generating apparatus and the sealed container of the present embodiment includes: the device comprises a parallel polar plate 1 (comprising an upper polar plate and a lower polar plate), a high-voltage direct-current power supply 2, a lead 3, an organic glass support 4, a sealed container 5, an opening 6 with a cover, a temperature and humidity controller 7, a fan 8 and a direct-current electric field intensity detector probe 9. The DC voltage is applied to the upper polar plate by the high-voltage DC power supply, so that a uniform-strength DC electric field is generated between the upper polar plate and the lower polar plate. In the sealed container, a temperature and humidity controller is adopted to regulate and control the temperature and the relative humidity in the container. Plastic particles with determined mass and particle size (such as 10 microns) are poured into the sealed container through a hole with a cover on the sealed container, the plastic particles in the container are uniformly suspended in the air by starting a fan in the container, and the concentration of air particles (such as PM10) in the container can be regulated by changing the mass of the added plastic particles.
Example 2
The present embodiment provides a system for correcting a field strength measured by a dc electric field strength detector, which includes:
the electric field intensity detection unit is used for detecting the electric field intensity of the detection environment by adopting a direct current electric field intensity detector;
the influence factor acquisition unit is used for acquiring the relative humidity, the temperature and the air particulate matter concentration of the detection environment where the direct current electric field strength detector is located;
and the electric field intensity correction unit is used for obtaining the field intensity correction quantities under the relative humidity, the temperature and the air particulate matter concentration of the detection environment according to the field intensity correction quantities under different relative humidities, temperatures and air particulate matter concentrations which are obtained in advance and the relative humidity, the temperatures and the air particulate matter concentration of the detection environment, and correcting the electric field intensity measured by the direct current electric field intensity detector to obtain the actual field intensity in the detection environment.
The electric field intensity correcting unit comprises the following correcting steps:
1) placing a direct current electric field intensity detector at the center of a lower polar plate of a parallel polar plate direct current electric field generating device, wherein the height between a probe of the direct current electric field intensity detector and the lower polar plate is h; the parallel polar plate direct current electric field generating device comprises a high-voltage direct current power supply, an upper polar plate and a lower polar plate, a direct current voltage U is applied to the upper polar plate of the parallel polar plate direct current electric field generating device, and the lower polar plate is grounded, so that a stable uniform electric field is generated between the upper polar plate and the lower polar plate;
2) placing the parallel polar plate direct current electric field generating device in a sealed container with adjustable relative humidity, temperature and air particulate concentration;
3) fixing the temperature T in a sealed container1And air particulate matter concentration P1Respectively setting the relative humidity in the sealed container to be H1、H2、H3…HiI is the serial numbers of different relative humidities, and the different relative humidities H are respectively recordediField intensity reading E of lower direct current electric field intensity detectori11；
4) Maintaining the concentration P of the air particles in the step 3)1Respectively setting the temperature in the sealed container to be T2、T3、T4…TjJ is the number of different temperatures, TjNext, the relative humidities are set to H, respectively1、H2、H3…HiRespectively recording different relative humidities HiDifferent temperature TjField intensity reading E of lower direct current electric field intensity detectorij1；
5) Respectively setting the air particle concentration in the step 4) as P2、P3、P4…PkK is the number of different air particulate matter concentrations, and the step 4) is repeated under different air particulate matter concentrations to respectively record different relative humidities HiDifferent temperature TjDifferent air particulate matter concentration PkField intensity reading E of lower direct current electric field intensity detectorijk；
6) Relative humidity in a sealed container is set to standard relativeHumidity, temperature and air particle concentration are set to be normal temperature and 0, and field intensity reading E of the direct current electric field intensity detector is recordedSign board；
7) According to Δ Wijk＝Eijk-ESign boardNamely, field intensity correction quantity delta W under different relative humidity, temperature and air particulate matter concentration is calculatedijk. Referring to fig. 2, the parallel plate dc electric field generating apparatus and the sealed container of the present embodiment includes: the device comprises a parallel polar plate 1 (comprising an upper polar plate and a lower polar plate), a high-voltage direct-current power supply 2, a lead 3, an organic glass support 4, a sealed container 5, an opening 6 with a cover, a temperature and humidity controller 7, a fan 8 and a direct-current electric field intensity detector probe 9. The DC voltage is applied to the upper polar plate by the high-voltage DC power supply, so that a uniform-strength DC electric field is generated between the upper polar plate and the lower polar plate. In the sealed container, a temperature and humidity controller is adopted to regulate and control the temperature and the relative humidity in the container. Plastic particles with determined mass and particle size (such as 10 microns) are poured into the sealed container through a hole with a cover on the sealed container, the plastic particles in the container are uniformly suspended in the air by starting a fan in the container, and the concentration of air particles (such as PM10) in the container can be regulated by changing the mass of the added plastic particles.
The upper and lower polar plates of the parallel polar plate direct current electric field generating device are circular polar plates with the diameter of D, and the thickness of the polar plates is h0And the distance between the two polar plates is D, wherein D/D is less than 0.5.
The sealed container with adjustable relative humidity, temperature and air particulate matter concentration, the temperature and the relative humidity in the container are regulated and controlled through a temperature and humidity controller, the temperature and humidity controller is made of plastics except necessary metal parts, and the temperature and humidity controller is far away from the parallel polar plate direct current electric field generating device.
The sealed container is a rectangular container made of acrylic plates, and the method for controlling the concentration of air particles in the container is as follows: the upper top surface of the sealed container is provided with an opening which can be closed by a cover, and the mass m is measured through the openingkA particle diameter of d0The plastic particles are poured into a sealed container; when the plastic particles are uniformly suspended in the air, the concentration of the air particles in the container is according to Pk＝mkAnd v (abc), calculating to obtain k as the number of different air particle concentrations, and a, b and c as the length, width and height of the sealed container respectively.
Because the plastic granules in the sealed container are difficult to clear away completely, for the setting precision of improving the air particulate matter concentration in the container, the air particulate matter concentration in the container should be set from low concentration to high concentration in proper order, namely: the concentration of air particles in the container is PkAdding plastic particles with mass of delta m to set the concentration of air particles in the container to be Pk+1，Pk+1＝Pk+Δm/(abc)。
The method for uniformly suspending the plastic particles in the air in the sealed container comprises the following steps: 2 fans with the same specification are respectively arranged on the lower bottom surface and the upper top surface of the sealed container, the fans are discontinuously started by taking a time interval delta T as a period, the duration time of each fan start is delta T, and delta T is less than delta T; during the starting period of the fan, the blades of the 4 fans are kept at the same and lower rotating speed, so that the air in the container flows at a speed of less than 2m/s, the field intensity detection time interval of the direct current electric field intensity detector is set, and the moment of reading the electric field intensity is positioned during the non-starting period of the fan.
The method for determining the actual field strength in the detected environment is as follows: according to the relative humidity, the temperature and the air particulate matter concentration of the detection environment (namely the data acquired by the influence factor acquisition unit), the field intensity correction quantity delta W under the relative humidity, the temperature and the air particulate matter concentration of the detection environment is obtained by the correction step 7 of the electric field intensity correction unit, and according to Eactual＝Eread-ΔW，
In the formula, EreadThe electric field intensity of the detection environment (namely the data acquired by the electric field intensity detection unit) is measured by the direct current electric field intensity detector, namely the actual field intensity E in the detection environment is calculatedactual。
Claims (10)
1. The method for correcting the field intensity measured by the direct current field intensity detector is characterized by comprising the following steps:
measuring the electric field intensity of the detection environment by using a direct current electric field intensity detector;
acquiring the relative humidity, the temperature and the air particulate matter concentration of the detection environment where the direct current electric field intensity detector is located;
and correcting the electric field intensity measured by the direct current field intensity detector to obtain the actual field intensity in the detection environment according to the field intensity correction quantities under different relative humidity, temperature and air particulate matter concentrations obtained in advance and the relative humidity, temperature and air particulate matter concentration of the detection environment.
2. The method of claim 1, wherein the field strength correction values for different relative humidities, temperatures and air particulate concentrations are obtained by:
1) placing a direct current electric field intensity detector at the center of a lower polar plate of a parallel polar plate direct current electric field generating device, wherein the height between a probe of the direct current electric field intensity detector and the lower polar plate is h; the parallel polar plate direct current electric field generating device comprises a high-voltage direct current power supply, an upper polar plate and a lower polar plate, a direct current voltage U is applied to the upper polar plate of the parallel polar plate direct current electric field generating device, and the lower polar plate is grounded, so that a stable uniform electric field is generated between the upper polar plate and the lower polar plate;
2) placing the parallel polar plate direct current electric field generating device in a sealed container with adjustable relative humidity, temperature and air particulate concentration;
3) fixing the temperature T in a sealed container1And air particulate matter concentration P1Respectively setting the relative humidity in the sealed container to be H1、H2、H3…HiI is the serial numbers of different relative humidities, and the different relative humidities H are respectively recordediField intensity reading E of lower direct current electric field intensity detectori11；
4) Maintaining the concentration P of the air particles in the step 3)1Respectively setting the temperature in the sealed container to be T2、T3、T4…TjJ is the number of different temperatures, TjThen, the phases areRespectively set to H for humidity1、H2、H3…HiRespectively recording different relative humidities HiDifferent temperature TjField intensity reading E of lower direct current electric field intensity detectorij1；
5) Respectively setting the air particle concentration in the step 4) as P2、P3、P4…PkK is the number of different air particulate matter concentrations, and the step 4) is repeated under different air particulate matter concentrations to respectively record different relative humidities HiDifferent temperature TjDifferent air particulate matter concentration PkField intensity reading E of lower direct current electric field intensity detectorijk；
6) Setting the relative humidity in the sealed container as standard relative humidity, setting the temperature as normal temperature, setting the concentration of air particles as 0, and recording the field intensity reading E of the direct-current electric field intensity detectorSign board；
7) According to Δ Wijk＝Eijk-ESign boardNamely, field intensity correction quantity delta W under different relative humidity, temperature and air particulate matter concentration is calculatedijk。
3. The method according to claim 2, wherein the upper and lower plates of the parallel-plate DC electric field generator in step 1) are circular plates with a diameter D and a plate thickness h0And the distance between the two polar plates is D, wherein D/D is less than 0.5.
4. The method according to claim 2, wherein the relative humidity, temperature and air particulate matter concentration of the sealed container in step 1) are adjustable, the temperature and relative humidity in the container are controlled by a temperature and humidity controller, and the temperature and humidity controller is made of plastic except essential metal parts and is far away from the parallel-plate dc electric field generator.
5. The method of claim 2The method for correcting the field intensity measured by the direct current field intensity detector is characterized in that the sealed container in the step 1) is a rectangular container made of an acrylic plate, the relative humidity, the temperature and the air particulate concentration are all adjustable, and the method for controlling the air particulate concentration in the container comprises the following steps: the upper top surface of the sealed container is provided with an opening which can be closed by a cover, and the mass m is measured through the openingkA particle diameter of d0The plastic particles are poured into a sealed container; when the plastic particles are uniformly suspended in the air, the concentration of the air particles in the container is according to Pk＝mkAnd v (abc), calculating to obtain k as the number of different air particle concentrations, and a, b and c as the length, width and height of the sealed container respectively.
6. The method for correcting the field intensity measured by a direct current electric field intensity detector as claimed in claim 5, wherein since the plastic particles in the sealed container are difficult to completely remove, in order to improve the setting accuracy of the concentration of the particulate matter in the air in the container, the concentration of the particulate matter in the air in the container should be set from a low concentration to a high concentration in order, that is: the concentration of air particles in the container is PkAdding plastic particles with mass of delta m to set the concentration of air particles in the container to be Pk+1，Pk+1＝Pk+Δm/(abc)。
7. The method for correcting the field intensity measured by the direct current electric field intensity detector according to claim 2, wherein the plastic particles in the sealed container are uniformly suspended in the air by the following method: 2 fans with the same specification are respectively arranged on the lower bottom surface and the upper top surface of the sealed container, the fans are discontinuously started by taking a time interval delta T as a period, the duration time of each fan start is delta T, and delta T is less than delta T; during the starting period of the fan, the blades of the 4 fans are kept at the same and lower rotating speed, so that the air in the container flows at a speed of less than 2m/s, the field intensity detection time interval of the direct current electric field intensity detector is set, and the moment of reading the electric field intensity is positioned during the non-starting period of the fan.
8. According to the claimsThe method for correcting the field intensity measured by the direct current field intensity detector 1 is characterized in that the method for determining the actual field intensity in the detection environment is as follows: in the detection environment, the electric field intensity of the detection environment measured by the DC electric field intensity detector is Eread(ii) a Detecting field intensity correction quantity of delta W under the relative humidity, temperature and air particulate matter concentration of the environment; according to Eactual＝EreadΔ W, i.e. the actual field strength E in the detection environment is calculatedactual。
9. Correction system of direct current electric field intensity detector survey field intensity, its characterized in that includes:
the electric field intensity detection unit is used for detecting the electric field intensity of the detection environment by adopting a direct current electric field intensity detector;
the influence factor acquisition unit is used for acquiring the relative humidity, the temperature and the air particulate matter concentration of the detection environment where the direct current electric field strength detector is located;
and the electric field intensity correction unit is used for obtaining the field intensity correction quantities under the relative humidity, the temperature and the air particulate matter concentration of the detection environment according to the field intensity correction quantities under different relative humidities, temperatures and air particulate matter concentrations which are obtained in advance and the relative humidity, the temperatures and the air particulate matter concentration of the detection environment, and correcting the electric field intensity measured by the direct current electric field intensity detector to obtain the actual field intensity in the detection environment.
10. The system for correcting the field intensity measured by the direct current electric field intensity detector according to claim 9, wherein the electric field intensity correcting unit comprises:
1) placing a direct current electric field intensity detector at the center of a lower polar plate of a parallel polar plate direct current electric field generating device, wherein the height between a probe of the direct current electric field intensity detector and the lower polar plate is h; the parallel polar plate direct current electric field generating device comprises a high-voltage direct current power supply, an upper polar plate and a lower polar plate, a direct current voltage U is applied to the upper polar plate of the parallel polar plate direct current electric field generating device, and the lower polar plate is grounded, so that a stable uniform electric field is generated between the upper polar plate and the lower polar plate;
2) placing the parallel polar plate direct current electric field generating device in a sealed container with adjustable relative humidity, temperature and air particulate concentration;
3) fixing the temperature T in a sealed container1And air particulate matter concentration P1Respectively setting the relative humidity in the sealed container to be H1、H2、H3…HiI is the serial numbers of different relative humidities, and the different relative humidities H are respectively recordediField intensity reading E of lower direct current electric field intensity detectori11；
4) Maintaining the concentration P of the air particles in the step 3)1Respectively setting the temperature in the sealed container to be T2、T3、T4…TjJ is the number of different temperatures, TjNext, the relative humidities are set to H, respectively1、H2、H3…HiRespectively recording different relative humidities HiDifferent temperature TjField intensity reading E of lower direct current electric field intensity detectorij1；
5) Respectively setting the air particle concentration in the step 4) as P2、P3、P4…PkK is the number of different air particulate matter concentrations, and the step 4) is repeated under different air particulate matter concentrations to respectively record different relative humidities HiDifferent temperature TjDifferent air particulate matter concentration PkField intensity reading E of lower direct current electric field intensity detectorijk；
6) Setting the relative humidity in the sealed container as standard relative humidity, setting the temperature as normal temperature, setting the concentration of air particles as 0, and recording the field intensity reading E of the direct-current electric field intensity detectorSign board；
7) According to Δ Wijk＝Eijk-ESign boardNamely, field intensity correction quantity delta W under different relative humidity, temperature and air particulate matter concentration is calculatedijk；
8) Obtaining field intensity correction quantity delta W under the relative humidity, the temperature and the air particulate matter concentration of the detection environment according to the relative humidity, the temperature and the air particulate matter concentration of the detection environment from 7), and obtaining the field intensity correction quantity delta W under the relative humidity, the temperature and the air particulate matter concentration of the detection environment according to theEactual＝Eread-ΔW，
In the formula, EreadThe electric field intensity of the detection environment is measured by the direct current electric field intensity detector, namely the actual field intensity E in the detection environment is calculatedactual。
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