Air conductivity measuring device

Abstract

An air conductivity measuring device is vertically erected on the ground, which comprises a cylindrical spiral coil, a feeding box, a single whip column and a base, the top of the feeding box is connected with the cylindrical spiral coil, the bottom of the feeding box is connected with the single whip column, the end of the single whip column away from the feeding box is connected with the base, and the air conductivity is obtained by detecting the input impedance of the antenna composed of the spiral coil and the single whip column at the resonant frequency. The input impedance at the resonant frequency of the antenna has a clear relationship with the environmental air conductivity, and the environmental air conductivity is obtained by measuring the input impedance at the resonant frequency of the antenna, so that a full-weather real-time method without manual intervention is provided for measuring the air conductivity.

Description

TECHNICAL FIELD

[0001] The present application relates to the measurement of air conductivity. BACKGROUND

[0002] Industrial city environment air is polluted due to industrial inorganic salt emission, and the conductivity of coastal environment air also changes greatly with air humidity. The air conductivity plays an important role in environment air quality monitoring and high-voltage transmission line arc prevention. However, the current air conductivity measurement method is time-consuming and labor-intensive and is an indirect method. SUMMARY

[0003] The present application provides an air conductivity measurement device, which uses a spiral coil antenna to measure air conductivity, and is a direct method without manual intervention, and can obtain air conductivity data in real time all day long, and provides a very convenient air conductivity measurement method for coastal area air monitoring, polluted air environment monitoring, high-voltage transmission arc prevention, etc.

[0004] According to the embodiment of the present application, an air conductivity measurement device is provided, which comprises, from top to bottom, a spiral coil, a feed box, a single whip column body and a base. The top of the feed box is connected to the spiral coil, the bottom of the feed box is connected to the single whip column body, the end of the single whip column body away from the feed box is connected to the base, the single whip column body is made of metal, and the air conductivity is obtained by detecting the input impedance at the resonant frequency of the antenna composed of the spiral coil and the single whip column body.

[0005] In some examples, the spiral coil is cylindrical.

[0006] In some examples, whether the input impedance changes is caused by the change of air conductivity is determined by whether the resonant frequency point of the antenna is shifted or not.

[0007] The present application has the advantages that the air conductivity is measured by using an antenna, the technical measures are convenient, it is a non-destructive direct measurement method, manual intervention is not needed, and the air conductivity can be obtained in real time all day long, especially for the measurement of air conductivity in the complex geographical environment of the coastal area. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below.

[0009] Figure 1 The air conductivity measurement device provided by the embodiment of the present application is shown in the schematic diagram.

[0010] Figure 2This is a diagram illustrating the effect of changing the input impedance characteristics of an antenna with altered air conductivity, provided in an embodiment of the present invention. Detailed Implementation

[0011] Figure 1 An air conductivity measuring device is shown. For example... Figure 1 As shown, the air conductivity measuring device includes, from top to bottom, a cylindrical helical coil YZXQ, a feed box KDH, a single-whip column DB, and a base JZ. The cylindrical helical coil is made of metal wire. It should be noted that the helical coil can also be other shapes, not limited to cylindrical. The outer shell of the feed box is made of insulating material, used to support the cylindrical helical coil and to achieve insulation between the single-whip column and the cylindrical helical coil. The single-whip column forms part of the antenna. The single-whip column is made of alloy tubing. The bottom end of the cylindrical helical coil is connected to the top of the feed box. The bottom end of the feed box is connected to the top of the single-whip column. The bottom end of the single-whip column is fixedly connected to the base, which vertically supports it on the ground.

[0012] The input impedance at the resonant frequency of an antenna composed of a helical coil and a single whip column has a clear relationship with the ambient air conductivity (this relationship is determined by simulation software). This invention obtains the ambient air conductivity by measuring the input impedance at the antenna's resonant frequency, providing a real-time, all-weather method for measuring air conductivity without human intervention.

[0013] The following is combined with Figure 2 This invention demonstrates the effect of changes in input impedance at the antenna resonant frequency when the air conductivity changes, thus proving its inventiveness.

[0014] In the simulation example, the cylindrical helical coil is made of copper wire, with 3.5 turns of the coil wound evenly, a winding radius of 0.2m, and a copper wire radius of 1mm. The single-whip column is made of alloy material, with the alloy tube being a hollow column with a radius of 5cm, a thickness of 1cm, and a height H of 2m.

[0015] from Figure 2 It can be seen that as the air conductivity d takes values ​​of 1e⁻⁵, 2e⁻⁵, 3e⁻⁵, 4e⁻⁵, and 5e⁻⁵ S / m, the impedance at the antenna's resonant frequency of 16.8 MHz changes, showing a trend of increasing with increasing conductivity. When the air conductivity changes, the environmental electromagnetic parameters of the antenna change, leading to an increase in the antenna's input impedance. Therefore, this characteristic can be used to measure the air conductivity of the antenna.

[0016] It should be pointed out that if the dielectric constant and permeability of air change, the input impedance of the antenna will also change, but the resonant frequency will shift. The change of the air conductivity will not cause the shift of the resonant frequency of the antenna. Whether the resonant frequency shifts or not can determine whether the change of the input impedance is caused by the change of the air conductivity.

Claims

1. An air conductivity measuring device, characterized in that, The device includes a helical coil, a feed box, a single-whip column, and a base connected sequentially from top to bottom. The top of the feed box is connected to the helical coil, and the bottom of the feed box is connected to the single-whip column. The end of the single-whip column away from the feed box is connected to the base. The single-whip column is made of metal. The outer shell of the feed box is made of insulating material to support the helical coil and to achieve insulation between the single-whip column and the helical coil. The helical coil and the single-whip column together constitute an antenna for measuring air conductivity. The air conductivity is obtained by detecting the input impedance of the antenna at its resonant frequency.

2. The air conductivity measuring device according to claim 1, characterized in that, The spiral coil is cylindrical.

3. The air conductivity measuring device according to claim 1, characterized in that, Whether the resonant frequency of the antenna shifts or not determines whether the change in input impedance is indeed caused by a change in air conductivity.

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