CN107045006B - Device for detecting oil gas pollution of underground water by using very low frequency method - Google Patents
Device for detecting oil gas pollution of underground water by using very low frequency method Download PDFInfo
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- CN107045006B CN107045006B CN201710154900.5A CN201710154900A CN107045006B CN 107045006 B CN107045006 B CN 107045006B CN 201710154900 A CN201710154900 A CN 201710154900A CN 107045006 B CN107045006 B CN 107045006B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
Abstract
The invention discloses a device for detecting oil and gas pollution of underground water by a very low frequency method, which comprises a box body and a control panel arranged in the box body, wherein the control panel is provided with a whip antenna, a magnetic rod antenna, a USB interface, a display, an LED alarm lamp, a frequency range selection button and a power switch, a built-in circuit of the control panel comprises an electromagnetic induction field receiving unit, a signal processing unit and a power supply unit, and the power supply unit is respectively connected with the electromagnetic induction field receiving unit and the signal processing unit through circuits. The invention has simple structure, low cost and convenient use, analyzes through the amplitude and the phase of the very low frequency signal, avoids the technical problem that the signal of only one navigation station can be received at one time by only utilizing the amplitude information of the signal in the prior art, so that the error of the measurement result is large, and effectively improves the detection efficiency and the detection precision.
Description
Technical Field
The invention belongs to the technical field of underground water oil gas pollution detection devices, and particularly relates to a device for detecting underground water oil gas pollution by a very low frequency method.
Background
Nowadays, china has entered the automobile era, more and more people are driving private cars, and many car owners often have the time when they can't find a gas station and make it difficult. However, when a gas station is built at the door of a house, people do not worry about whether the gas station is safe, and the gas station is one of the non-negligible urban pollution sources. It is understood that there are not a few gas station oil and gas leak events occurring in various locations, as in a survey of the 90 s of the united states, 40% of 21 ten thousand gas stations have leaks and 15 ten thousand gas stations wait for processing. The leaked oil gas can pollute underground water sources and soil, and unpredictable risks are brought to comfortable urban life of people. However, in order to eliminate the pollution and prevent the further diffusion of the pollution, people usually drill several wells near the oil and gas leakage and extract underground water samples for analysis, and the method has large engineering quantity and long duration and needs a lot of time and energy. Therefore, it is imperative to develop a device for detecting underground water oil gas pollution with flexible working mode and high measurement precision, and in addition, the development of high-precision underground oil gas pollution detection technology is also a foundation for establishing safe and green cities in the scientific and technological era.
Disclosure of Invention
The invention solves the technical problem of providing the device for detecting the underground water oil gas pollution by the very low frequency method with flexible working mode and high measurement precision, the device detects the underground water oil gas pollution degree by combining the very low frequency method with the signal processing technology and displays and alarms in real time, and workers can conveniently master the underground water oil gas pollution condition of a certain area in real time.
The invention adopts the following technical scheme to solve the technical problems, and the device for detecting the oil and gas pollution of underground water by using a very low frequency method is characterized by comprising a box body and a control panel arranged in the box body, wherein the control panel is provided with a whip antenna, a magnetic rod antenna, a USB interface, a display, an LED alarm lamp, a frequency range selection button and a power switch; the electromagnetic induction field receiving unit comprises an anti-aliasing filter, a low noise amplifier, a rubidium atomic frequency standard and a pulse shaping circuit, wherein a whip antenna and a magnetic rod antenna are respectively and electrically connected with the anti-aliasing filter, the whip antenna is used for receiving a VLF signal with a wave band of 10-15KHz from a navigation platform, the magnetic rod antenna is made of a magnetic conductive material and used for sensing an electromagnetic signal around a magnetic rod, the anti-aliasing filter is electrically connected with the low noise amplifier, the anti-aliasing filter is used for filtering the received electromagnetic signal and extracting a useful electromagnetic signal, the low noise amplifier is electrically connected with an A/D acquisition card, the low noise amplifier adopts an amplifying circuit with adjustable gain and composed of AD7520, the amplification factor is adjusted within 8-128, the useful signal can be amplified according to the strength of the received signal, the rubidium atomic frequency standard is electrically connected with the pulse shaping circuit, the rubidium atomic frequency standard is used for outputting a stable sine wave signal, the pulse shaping circuit is electrically connected with the A/D acquisition card, and the pulse shaping circuit is used for processing the sine wave signal and outputting a sampling pulse signal of 40 KHz; the signal processing unit comprises an A/D acquisition card and a computer, the A/D acquisition card is electrically connected with the computer, the A/D acquisition card is used for converting amplified useful signals and sampling pulse signals and storing the useful signals and the sampling pulse signals into the A/D acquisition card, a visual resistivity calculation module is arranged in the computer, the visual resistivity calculation module is used for calculating and processing data in the A/D acquisition card to obtain visual resistivity of the area and comparing the visual resistivity with a visual resistivity standard value of clean underground water stored in the computer, the computer is respectively connected with an LED alarm lamp and a display through lines, the LED alarm lamp is used for starting alarm reminding when the measured relative value of the visual resistivity exceeds the upper limit of a set value, the display is used for displaying all data in the testing process, and the data is stored in a data storage module of the computer and LED out through a USB interface so as to research the data.
The invention relates to an operation method of a device for detecting underground water oil gas pollution by a very low frequency method, which is characterized by comprising the following specific processes: when detecting whether oil gas leakage near a gas station pollutes underground water nearby and the pollution degree and range, the detection device is horizontally placed at a position parallel to the ground surface by taking a leakage point of the gas station as a circle center and taking any length as a radius, a power switch is turned on, power supply equipment starts to work, a whip antenna automatically searches for a VLF signal emitted by a Russian Alpha navigation system, a magnetic rod antenna starts to sense a magnetic field component in the vertical direction, a channel selection knob is rotated at the same time, the knob is fixed after the signal is stabilized, a useful signal is extracted through an anti-aliasing filter and amplified through a low noise amplifier, the VLF signal and a 40KHz sampling pulse signal output by the shaping of an atomic frequency standard frequency division circuit are converted in an A/D acquisition card, a computer processes and records the amplitude and the phase of the extracted VLF signal, the relative rubidium of the apparent resistivity is calculated, the data result is transmitted to a data storage module of the computer after comparison and analysis, the data result is displayed on a display, and if the data result exceeds a set upper limit, an LED alarm lamp starts to give an alarm.
The invention has simple structure, low cost and convenient use, analyzes through the amplitude and the phase of the very low frequency signal, avoids the technical problem that the signal of only one navigation station can be received at one time by only utilizing the amplitude information of the signal in the prior art, so that the error of the measurement result is large, and effectively improves the detection efficiency and the detection precision.
Drawings
FIG. 1 is a block diagram of the present invention;
fig. 2 is a schematic structural diagram of the present invention.
In the figure: 1. the device comprises a box body, 2, a control panel, 3, a whip antenna, 4, a magnetic rod antenna, 5, a USB interface, 6, a frequency band selection button, 7, a display, 8, a power switch, 9 and an LED alarm lamp.
Detailed Description
The details of the present invention are described in detail with reference to the accompanying drawings. As shown in fig. 1-2, the device for detecting oil and gas pollution of underground water by using very low frequency method comprises a box body 1 and a control panel 2 arranged inside the box body 1, wherein the control panel 2 is provided with a whip antenna 3, a magnetic rod antenna 4, a USB interface 5, a display 7, an LED alarm lamp 9, a frequency band selection button 6 and a power switch 8, the built-in circuit of the control panel 2 comprises an electromagnetic induction field receiving unit, a signal processing unit and a power supply unit, wherein the power supply unit is respectively connected with the electromagnetic induction field receiving unit and the signal processing unit through circuits; the electromagnetic induction field receiving unit comprises an anti-aliasing filter, a low noise amplifier, a rubidium atomic frequency standard and a pulse shaping circuit, wherein a whip antenna 3 and a magnetic rod antenna 4 are respectively electrically connected with the anti-aliasing filter, the whip antenna 3 is used for receiving VLF signals with the wave band of 10-15KHz from a navigation platform, the magnetic rod antenna 4 is made of magnetic conductive materials and used for sensing electromagnetic signals around a magnetic rod, the anti-aliasing filter is electrically connected with the low noise amplifier, the anti-aliasing filter is used for filtering the received electromagnetic signals and extracting useful electromagnetic signals, the low noise amplifier is electrically connected with an A/D acquisition card, the low noise amplifier adopts an amplifying circuit with adjustable gain and composed of AD7520, the amplification factor is adjusted within 8-128, the useful signals can be amplified according to the strength of the received signals, the rubidium atomic frequency standard is electrically connected with the pulse shaping circuit, the rubidium atomic frequency standard is used for outputting stable sine wave signals, the pulse shaping circuit is electrically connected with the A/D acquisition card, and the pulse shaping circuit is used for processing sine wave signals and outputting sampling pulse signals of 40 KHz; the signal processing unit comprises an A/D acquisition card and a computer, the A/D acquisition card is electrically connected with the computer, the A/D acquisition card is used for converting amplified useful signals and sampling pulse signals and storing the useful signals and the sampling pulse signals into the A/D acquisition card, a visual resistivity calculation module is arranged in the computer, the visual resistivity calculation module is used for calculating and processing data in the A/D acquisition card to obtain visual resistivity of the area and comparing the visual resistivity with a visual resistivity standard value of clean underground water stored in the computer, the computer is respectively connected with an LED alarm lamp and a display through lines, the LED alarm lamp is used for starting alarm reminding when the measured relative value of the visual resistivity exceeds the upper limit of a set value, the display is used for displaying all data in the testing process, and the data is stored in a data storage module of the computer and LED out through a USB interface so as to research the data.
The working principle of the invention is as follows: when underground water is polluted by oil gas, the resistivity in the pollution area is mainly controlled by gasoline on a diving surface, the gasoline soaks soil on the diving surface to cause the resistivity to be increased, and in addition, clay on the surface layer of the pollution area forms a good blocking layer to prevent the gasoline from freely diffusing. The invention can estimate the underground water oil gas pollution condition by measuring the relative change value of the underground water resistivity and comparing the change quantity after signal processing with the real resistivity value of the underground water.
The specific operation process of the invention is as follows: when detecting whether oil gas leakage near a gas station pollutes underground water nearby and the pollution degree and range, a detection device is horizontally placed at a position parallel to the ground surface by taking a leakage point of the gas station as a circle center and taking any length as a radius, a power switch is turned on, power supply equipment starts to work, then a whip antenna automatically searches for a VLF signal emitted by a Russian Alpha navigation system, a magnetic rod antenna starts to sense a magnetic field component in the vertical direction, a channel selection knob is rotated at the same time, the knob is fixed after the signal is stabilized, a useful signal is extracted through an anti-aliasing filter and amplified through a low noise amplifier, the VLF signal and a 40KHz sampling pulse signal output by the shaping of an atomic frequency standard frequency division circuit are converted in an A/D acquisition card, a computer processes and records the amplitude and the phase of the extracted VLF signal, the relative rubidium of the apparent resistivity is calculated, the data result is transmitted to a data storage module of the computer after comparison analysis, the data result is displayed on a display, and if the data result exceeds a set upper limit, an LED alarm lamp starts to give an alarm. The device can supply relevant staff to master in real time and know the groundwater oil gas pollution condition in this region, then according to the testing result, formulates reasonable improvement scheme for improve the environment to guarantee nearby resident's quality of life.
While there have been shown and described what are at present considered the fundamental principles of the invention, its essential features and advantages, the invention further resides in various changes and modifications which fall within the scope of the invention as claimed.
Claims (1)
1. A running method of a device for detecting underground water oil gas pollution by a very low frequency method is characterized by comprising the following steps: the device for detecting oil and gas pollution of underground water by the very low frequency method comprises a box body and a control panel arranged in the box body, wherein a whip antenna, a magnetic rod antenna, a USB interface, a display, an LED alarm lamp, a frequency band selection button and a power switch are arranged on the control panel; the electromagnetic induction field receiving unit comprises an anti-aliasing filter, a low noise amplifier, a rubidium atomic frequency standard and a pulse shaping circuit, wherein a whip antenna and a magnetic rod antenna are respectively and electrically connected with the anti-aliasing filter, the whip antenna is used for receiving a VLF signal with a wave band of 10-15KHz from a navigation platform, the magnetic rod antenna is made of a magnetic conductive material and used for sensing an electromagnetic signal around a magnetic rod, the anti-aliasing filter is electrically connected with the low noise amplifier, the anti-aliasing filter is used for filtering the received electromagnetic signal and extracting a useful electromagnetic signal, the low noise amplifier is electrically connected with an A/D acquisition card, the low noise amplifier adopts an amplifying circuit with adjustable gain and composed of AD7520, the amplification factor is adjusted within 8-128, the useful signal can be amplified according to the strength of the received signal, the rubidium atomic frequency standard is electrically connected with the pulse shaping circuit, the rubidium atomic frequency standard is used for outputting a stable sine wave signal, the pulse shaping circuit is electrically connected with the A/D acquisition card, and the pulse shaping circuit is used for processing the sine wave signal and outputting a sampling pulse signal of 40 KHz; the signal processing unit comprises an A/D acquisition card and a computer, the A/D acquisition card is electrically connected with the computer, the A/D acquisition card is used for converting amplified useful signals and sampling pulse signals and storing the converted useful signals and the sampling pulse signals into the A/D acquisition card, a visual resistivity calculation module is arranged in the computer, the visual resistivity calculation module is used for calculating and processing data in the A/D acquisition card to obtain the visual resistivity of an area and comparing the visual resistivity with the visual resistivity standard value of clean underground water stored in the computer, the computer is respectively connected with an LED alarm lamp and a display through a line, the LED alarm lamp is used for starting alarm reminding when the measured relative value of the visual resistivity exceeds the upper limit of a set value, the display is used for displaying all data in the testing process, and the data is stored in a data storage module of the computer and is LED out through a USB interface so as to research the data;
the specific operation process of the device for detecting underground water oil gas pollution by the very low frequency method is as follows: when detecting whether oil gas leakage near a gas station pollutes underground water nearby and the pollution degree and range, the detection device is horizontally placed at a position parallel to the ground surface by taking a leakage point of the gas station as a circle center and taking any length as a radius, a power switch is turned on, power supply equipment starts to work, a whip antenna automatically searches for a VLF signal emitted by a Russian Alpha navigation system, a magnetic rod antenna starts to sense a magnetic field component in the vertical direction, a channel selection knob is rotated at the same time, the knob is fixed after the signal is stabilized, a useful signal is extracted through an anti-aliasing filter and amplified through a low noise amplifier, the VLF signal and a 40KHz sampling pulse signal output by the shaping of an atomic frequency standard frequency division circuit are converted in an A/D acquisition card, a computer processes and records the amplitude and the phase of the extracted VLF signal, the relative rubidium of the apparent resistivity is calculated, the data result is transmitted to a data storage module of the computer after comparison and analysis, the data result is displayed on a display, and if the data result exceeds a set upper limit, an LED alarm lamp starts to give an alarm.
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| CN201710154900.5A CN107045006B (en) | 2017-03-15 | 2017-03-15 | Device for detecting oil gas pollution of underground water by using very low frequency method |
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| CN107991646A (en) * | 2017-11-21 | 2018-05-04 | 中国电子科技集团公司第二十研究所 | Very low frequency navigation electric wave propagation prediction refined method based on cloud framework |
| CN108957557A (en) * | 2018-05-07 | 2018-12-07 | 河南师范大学 | A kind of very low frequency method coal mine gob detection device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3984758A (en) * | 1974-06-14 | 1976-10-05 | Bureau De Recherches Geologiques Et Minieres | Method and apparatus for geophysical exploration in drill holes by means of very low frequency waves |
| CN204731426U (en) * | 2015-05-18 | 2015-10-28 | 河南师范大学 | A kind of very low frequency (VLF) visits water instrument |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3984758A (en) * | 1974-06-14 | 1976-10-05 | Bureau De Recherches Geologiques Et Minieres | Method and apparatus for geophysical exploration in drill holes by means of very low frequency waves |
| CN204731426U (en) * | 2015-05-18 | 2015-10-28 | 河南师范大学 | A kind of very low frequency (VLF) visits water instrument |
Non-Patent Citations (1)
| Title |
|---|
| 基于软件无线电的甚低频法探矿的研究;牛有田等;《地球物理学进展》;20160229;第31卷(第01期);全文 * |
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