WO2009000944A1

WO2009000944A1 - System for the continuous measurement of time-variable electric, magnetic and electromagnetic fields

Info

Publication number: WO2009000944A1
Application number: PCT/ES2008/000350
Authority: WO
Inventors: Carlos MASCAREÑAS PEREZ-IÑIGO
Original assignee: Universidad De Cadiz
Priority date: 2007-06-28
Filing date: 2008-05-19
Publication date: 2008-12-31
Also published as: ES2324446B2; ES2324446A1

Abstract

The invention relates to a system for the continuous measurement of time-variable electric, magnetic and electromagnetic fields. The invention includes the methodology and platform necessary for the continuous measurement of time-variable electric, magnetic and electromagnetic fields, with the participation of one or more operators to carry out the measurement or test. Said system, method and platform are suitable for any test in which the sensor must move in a straight line and the field to be measured is not disturbed by interference from a human presence.

Description

CONTINUOUS MEASUREMENT SYSTEM OF VARIABLE ELECTRICAL, MAGNETIC AND ELECTROMAGNETIC FIELDS IN TIME.

SECTOR OF THE TECHNIQUE Measurements of electromagnetic fields, related to the measure of influence on or from devices, components or interference of human presence.

STATE OF THE TECHNIQUE

The relevant documents, related to the object of the search would be the following:

DE 4342107. In this invention a device for the positioning of a sensor in space is described, based on a suspension made of non-conductive material, the objective being to avoid any interference in the measurement of the sensor.

US 5923174. This invention describes a device for measuring the absorption of electromagnetic radiation on a surface comprising an electromagnetic transceiver and x-y-z positioning mechanisms.

US 2003/0122078. In this invention a mobile measuring device for large surfaces and high degree of precision in the characterization of radiant fields is described, counting for it with a mobile platform. In this invention, the use of GPS receivers is recognized as a means of posterization.

US 4929960. This invention relates to means for determining the spherical position of the radiated energy peak, which as an element close to the object of our invention has among others, a movable mast (11) thereby raising the placed antennas. on the mast in order to place said antennas on the regions of possible radiation, casting for said positioning with a height-positioning mechanism operated by a motor. JP 200008903. In this invention a device for measuring electromagnetic fields is described, having for this purpose a positioning platform where an electronic circuit board is placed on which to carry out the measurements, an antenna for measuring the radiations emitted by a of the faces of the circuit board, conduction means that allow scanning to the antenna on the face of the circuit board.

US 6850851. Describes a radiation measuring equipment radiated by electronic equipment, said device among other elements having a sensor 23 disposed on a movable arm, on the other hand counting the fixed part of the device with another series of sensors.

As can be seen in all the aforementioned documents, the measurement of radiation, preferably electromagnetic, is carried out by using a mobile element that moves in the vicinity or around the equipment to be measured.

Except in US 5923174, in no case is the use of a mobile platform described, which is positioned on the surface to be measured. However, in this invention the means of travel used are not the same as those set forth in the search request brief.

On the other hand, it is noteworthy that the use of GPS receiver means, used for the measurement of radiation, so that they transmit the position of the sensor at the time of measurement is something known as shown in US 2003/0122078, also recognizing the use of optical signals, although not transmitted by means of a fiber optic cable. EXPLANATION OF THE INVENTION

The object of the invention consists of a device for the continuous measurement of electric, magnetic and electromagnetic fields that vary over time, in which for the realization of the measurement, the participation of one or more researchers is required, who are responsible for maneuver the displacement of the measuring device used. Being of special utility in those cases in which the sensor must move in a straight line without suffering any interference from the human presence.

The technical problem that the object of the search intends to solve is to achieve a measurement device not affected in the values obtained by the proximity of the human presence. To achieve the above purpose, a mobile platform has been developed that can be moved in both directions along a straight line. For this, it has rollers fastened at fixed points through which some ends are passed, through which the platform is pulled in one direction or another.

The mobile platform will be of non-metallic material of variable longitudinal dimension, which has means for the rotation and support of some wheels. The wheels will have constructive characteristics that will prevent them from leaving their axles.

The platform in its geometric center will have a non-metallic element arranged vertically that supports the field sensor, E, H or EH and / or its optical repeater by means of plastic flanges, adhesive tape.

The measurement obtained by the field sensor, E, H, EH is transmitted to the meter by means of a fiber optic cable of adequate size for the experiment, on the other hand, in order to transmit the geographical position of the sensor, a support is provided where to locate a GPS or GNSS satellite navigation receiver the data is transmitted by fiber optic to a data multiplexing matrix or to a personal computer.

Also and in order to achieve a perfect alignment of the platform, the platform is provided with a magnetic compass.

Finally, to obtain data on the horizontality of the platform, two circular bubble cymometers are provided, one parallel to the longitudinal axis and another to the transverse.

Another constructive variant would be to provide the platform with a support in the form of "T" in case you want to simultaneously take the measurements of fields in several frequencies.

DESCRIPTION OF THE DRAWINGS

Figure 1. General system layout. In her they are distinguished:

0, - Researchers.

1.- Fixed anchor point of the system. 2.- Lines of connection of the fixed point to the sheaves.

3, - Rollers.

4.- Towing line.

5.- Platform.

6.- Fiber optic.

Figure 2.1. Mobile platform without measuring elements. Profile view.

Figure 2.2. Mobile platform without measuring elements. Elevation View

Figure 2.3. Mobile platform without measuring elements. Plan view. Figure 3.1. Mobile platform with the optical repeater of the sensor installed by gravity with its data transmission tube inside the support or basket. Profile view. In her they are distinguished: 4.- Line of tow.

6.- Fiber optic. 7.- Sensor E, H, EH. 8.- Optical repeater. 9.- GPS / GNSS receiver. 10.- Magnetic compass.

Figure 3.2. Mobile platform with the optical repeater of the sensor installed by gravity with its data transmission tube inside the support or basket. Elevation view In her they are distinguished: 4.- Line of tow.

Figure 3.3. Mobile platform with the optical repeater of the sensor installed by gravity with its data transmission tube inside the support or basket. Plan view. In her they are distinguished: 4.- Line of tow.

6.- Fiber optic. 7.- Sensor E, H, EH. 8.- Optical repeater. 9.- GPS / GNSS receiver. 10.- Magnetic compass. Figure 4.1. Mobile platform with the sensor's optical repeater located inside the support or basket. Profile view. In her they are distinguished: 4.- Line of tow.

Figure 4.2. Mobile platform with the sensor's optical repeater located inside the support or basket. Elevation view In her they are distinguished: 4.- Line of tow.

Figure 4.3. Mobile platform with the sensor's optical repeater located inside the support or basket. Plan view. In her they are distinguished: 4.- Line of tow.

6.- Fiber optic. 7.- Sensor E, H, EH. 8.- Optical repeater. 9.- GPS / GNSS receiver. 10.- Magnetic compass. Figure 5. Magnetic compass, pinions and reading wire.

Figure 6. Horizontal and vertical cymometer.

Figure 7.1. Modification in the form of "T" for simultaneous measurement with two sensors. Profile view.

Figure 7.2. Modification in the form of "T" for simultaneous measurement with two sensors. Elevation view

Figure 7.3. Modification in the form of "T" for simultaneous measurement with two sensors. Plan view.

EMBODIMENT OF THE INVENTION

Therefore, the object of the search basically consists of a mobile platform, movable in both directions along a straight line, by means of the performance of cables fixed to the platform at both ends. On the platform there is a support of an E, H or EH field sensor, its optical repeater. As additional means that improve its operability would be a GPS receiver, a fiber optic cable connection, a magnetic compass for alignment, and two bubble cymeters.

The invention presented here deals with the methodology and platform necessary for the measurement, in continuous, of electric, magnetic and electromagnetic fields that vary over time with the use of one or more researchers to carry out the measurement or test. This system, method and platform are applicable to any other test in which the sensor must move in a straight line and the field to be measured should not be disturbed by interference from human presence.

The system consists of a mobile platform that will be described later, two sheaves without metal elements or with the least presence thereof and a towing line or rope of a non-metallic nature and length provided for the test to be performed.

In order to position the sheaves in the right place for the experiment, they are provided with Link Lines for their mooring to one or several fixed points, according to the conditions of the environment in which the experiment is carried out (Figure 1).

Using the tensile force applied by one of the investigators to the required towing line, a longitudinal force is produced throughout the entire towing line, motivated by the tension of the fibers, which can be channeled through the sheaves that they have been fixed to non-mobile elements through small link lines.

The towing line on which traction is exerted, will produce the movement of the platform in a straight line without human presence in the vicinity, so that the magnetic, electrical or electromagnetic fields present in the area will not be disturbed.

By means of the other towing line, the platform can be pulled back, by pulling it, in order to repeat a doubtful measurement or perform the test in the reverse direction, at the same time that both trailer lines can be tensioned to center the platform in its path in the event that it has left the course or defeat chosen. To know the distance traveled by the platform during the experiments, you can record the distance, by segments of 50 cm or any other measure, on the tow lines, either by means of nursery or by an appropriate code of colors or marks.

The mobile platform consists of a flat non-metallic central element of variable longitudinal dimension, but which for normal use will be approximately 100 cm, 20 cm wide and 16 mm thick, to which they are fixed, using two Teflon screws or similar non-metallic, 20 mm in diameter and 60 in length, with their appropriate nuts and washers, two other non-metallic flat elements, or crossarms, approximately 50 cm long, 20 cm wide and 19 mm thick. These crossarms are fixed at each end and with its axis centered on the central axis of the crosshead, a wooden shaft, Teflon or any non-metallic element that acts as the axis of rotation of the wheels that allow the movement of the platform.

The wheels, for example of plastic, will have a diameter that allows the passage without problems or collisions of the lowest point of the platform through the floor or floor of the enclosure to be measured, in general a minimum wheel diameter of 20 cm should be used.

To prevent the wheels from leaving its axle, a device screwed on it and whose nature is not metallic will be used, and other types of non-metallic elements can also be used for the same purpose, such as through pins and the like.

At the ends of the longitudinal central element, and aligned on the longitudinal axis, two perforations are made that allow the introduction of a non-metallic line or rope that allows the platform to be towed in one direction or another. These perforations will be through and may have a variable diameter, from the one necessary to introduce the whip of the tow line as the one necessary to be able to introduce the researchers' hand for transporting the system (Figure 2). In the center of gravity of the platform and its wheels, which must coincide with the midpoint of the longitudinal central element, both in the longitudinal and transverse axis, a perforation of approximately 30 mm will be made, which will allow the passage (or fixation by inkwell or similar) of a wooden tube or vertical non-metallic element of length L and which will serve as support for the E, H or EH field sensor and / or its optical repeater by means of plastic flanges, adhesive tape or a specific support for each brand or model of sensor / repeater to use (Figure 3).

In the case of using a specific support, a basket or a plastic tube of suitable inner diameter can be used, smaller than the diameter of the sensor in the case that the basket supports the gravity sensor (Figure 3) and 5 mm higher than the of the optical repeater in the case that the basket supports the sensor and the repeater (figure 4).

The data from the E, H or EH field sensor are transmitted to the meter by means of a fiber optic cable of adequate size for the experiment, and must be drilled through the back drilling of the platform.

In addition to the measured data, the geographical position of the sensor is transmitted, since in the longitudinal element of the platform a wooden, plastic or non-metallic material basket is installed where a GPS or GNSS satellite navigation receiver will be located and its data is transmitted by fiber optic towards a matrix of multiplexing of data or towards a personal computer (Figure 4).

In order to achieve the perfect alignment of the platform with the tow cables and the definition of the defeat to follow, the longitudinal element of an inkwell, made by drilling or by a non-metallic basket, is provided for the location of a compass magnetic and the fixation of two wooden or plastic material pins (see figure 5), equipped with a thread that joins them and passes over the center of rotation of the magnetic compass, in order to facilitate the measurement of the heading of the platform.

In order to obtain data on the horizontality of the platform, the longitudinal element is provided with two semicircular bubble clinometers (see figure 6), one parallel to the longitudinal axis and the other parallel to the transverse axis, both in the horizontal plane. The position of the bubble on a graded scale on purpose will provide data on the horizontality of the platform and, therefore, the verticality of the sensor.

Both bubble sensors can be replaced or complemented by a single hemispherical indicator or by clinometric or gyroscopic transducers as long as they do not alter the accuracy in the measurement of the electromagnetic fields.

In the case that you want to simultaneously take the measurements of fields in several frequencies, this is by means of different sensors you can use a support in the form of "T" (see figure 7) and a matrix of multiplexing of data or several meters simultaneously.

In this case, two non-metallic baskets or tubes would be used at the ends of the horizontal element of the "T" arranged vertically and at a distance not exceeding that of the transverse elements or crossarms. Said horizontal element has another central basket, but inverted 180 ° with respect to those of its extremities, which is used to insert in it the vertical tube of the platform and serve as a stop.

Claims

1.- Continuous measurement system of electric, magnetic and electromagnetic fields that vary over time, characterized in that the possible disturbances on the magnetic, electric or electromagnetic fields produced by the human presence in the vicinity are avoided by placing the measuring elements on a platform equipped with longitudinal movement, in both directions, thanks to the traction force that can be exercised at a distance by the person in charge of carrying out the measurement, on one of the ends of each of the two non-metallic ends that are placed at your disposal , which, after passing through sheaves fastened by means of connecting lines to fixed points placed at the end of the platform, are attached at the other end to the platform.

2. Continuous measurement system of electric, magnetic and electromagnetic fields that vary over time, according to claim 1, characterized in that it comprises: a) A mobile platform, constructed of non-metallic material and variable dimension, which serves as support for the elements necessary for the realization of the measurement, movable in both directions along a straight line, by means of the action of some ends fixed to the platform at both ends, each of which is made to pass through a sheave. b) Two ends, also called towing lines, of a non-metallic nature, each of which are connected by one of its ends to a different end of the mobile platform, are passed through the sheaves and its other end is available so that the person in charge of the measurement, by traction through the entire trailer line, moves the platform. c) Two sheaves without metal elements or with the least presence of them, which serve as the end of the platform, as they are attached to two fixed points through link lines, through each of which one of the cables of the towing line is passed, which are attached at one end to the platform and on the other available so that the person in charge of the measurement can perform the necessary tensile force that causes the platform to move longitudinally. d) Two lines of link, one of each sheave to a fixed point, which serves to position them in a suitable place so that when pulling the tow lines that pass through them, the platform moves in a straight line. e) Measuring elements, which are placed on a vertical support of the platform, forming part of these elements at least one sensor of fields E, H or EH and its optical repeater, being asked to provide additional elements that improve its operability. f) A fiber optic cable of adequate length, which transmits the data of the measuring elements, placed on the platform, to a data multiplexing matrix, or to a personal computer.

3. Continuous measurement system of electric, magnetic and electromagnetic fields that vary over time, according to claims 1 and 2, characterized in that the platform has a non-metallic element arranged vertically that will support the E-field sensor, H or EH and / or its optical repeater by means of plastic flanges, tape or a specific support for each brand or model of sensor / repeater to be used.

4. Continuous measurement system of electric, magnetic and electromagnetic fields that vary over time, according to claims 1 to 3, characterized in that to transmit the geographical position of the sensor, a wooden, plastic or non-material basket is installed on the platform metallic, where a GPS or GNSS satellite navigation receiver will be located.

5.- Continuous measurement system of electric, magnetic and electromagnetic fields that vary over time, according to claims 1 to 4, characterized in that to achieve the perfect alignment of the platform with the tow cables and the definition of the defeat to follow, the longitudinal element of the platform is provided with an inkwell, made by drilling or by a non-metallic basket, for the location of a magnetic compass and the fixation of two wooden or plastic material pinulas, equipped with a thread that joins and passes them above the center of rotation of the magnetic compass, in order to facilitate the measurement of the heading of the platform.

6. System for continuous measurement of electric, magnetic and electromagnetic fields that vary over time, according to claims 1 to 5, characterized in that in order to obtain data on the horizontality of the platform and, therefore, on the verticality of the sensor, it provides the longitudinal element of the platform with two semicircular bubble cymometers, one parallel to the longitudinal axis and the other parallel to the transverse axis, both in the horizontal plane.

7. Continuous measurement system of electric, magnetic and electromagnetic fields that vary over time, according to claim 6, characterized in that the bubble sensors can be replaced or complemented by a single hemispherical indicator or by clinometric or gyroscopic transducers as long as no alter the accuracy in the measurement of electromagnetic fields.

8.- Continuous measurement system of electric, magnetic and electromagnetic fields that vary over time, according to claims 1 to 7, characterized in that to simultaneously take measurements of fields at several frequencies, that is, by means of different sensors, a support can be used in the form of "T" on which the different sensors and a matrix of data multiplexing or several meters will be placed simultaneously.