EP2567460A1 - Appareil de recherche - Google Patents

Appareil de recherche

Info

Publication number
EP2567460A1
EP2567460A1 EP11709919A EP11709919A EP2567460A1 EP 2567460 A1 EP2567460 A1 EP 2567460A1 EP 11709919 A EP11709919 A EP 11709919A EP 11709919 A EP11709919 A EP 11709919A EP 2567460 A1 EP2567460 A1 EP 2567460A1
Authority
EP
European Patent Office
Prior art keywords
search device
electromagnetic
push
pull
search
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP11709919A
Other languages
German (de)
English (en)
Inventor
Reiner Krapf
Tobias Zibold
Andrej Albrecht
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2567460A1 publication Critical patent/EP2567460A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/0011—Arrangements or instruments for measuring magnetic variables comprising means, e.g. flux concentrators, flux guides, for guiding or concentrating the magnetic flux, e.g. to the magnetic sensor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/15—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for use during transport, e.g. by a person, vehicle or boat
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/95—Proximity switches using a magnetic detector
    • H03K17/952—Proximity switches using a magnetic detector using inductive coils
    • H03K17/9525—Proximity switches using a magnetic detector using inductive coils controlled by an oscillatory signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/955—Proximity switches using a capacitive detector

Definitions

  • the invention relates to a search device.
  • the invention relates to a
  • Search device with the features of claim 1 for detecting an object.
  • the hidden in the wall object may be, for example, a water, electricity or gas line, which should not be damaged when processing the wall.
  • the object may also be a wooden beam or other supporting structure, and the machining should take place in the area of the supporting structure.
  • a magnetic field is usually generated and it is checked whether the object affects the magnetic field. If the influence exceeds a predetermined level, the object is detected.
  • a non-metallic article such as a wooden beam, can be detected by its dielectric properties. For this purpose, an electric field is generated and checks to what extent the object affects the electric field. The object is detected when the influence exceeds a predetermined level. If the object is a current or voltage-carrying conductor, an electromagnetic field can also be detected which surrounds the conductor. Items that are neither metallic nor have easily detectable dielectric properties, such as a plastic-clad, copper power line, can be detected in this manner.
  • a fundamental problem with searchers is that they tend to erroneous readings as detection sensitivity increases. The search devices must therefore be calibrated in the area of the measuring location by a user. The calibration can make the measuring process complex and ambiguous.
  • the invention has for its object to provide a sensitive search device with ease of use.
  • An inventive search device for detecting an object comprises a push-pull measuring bridge for driving a first and a second electromagnetic device in a variable ratio.
  • the first electromagnetic device generates an electromagnetic alternating field in the region of the object as a function of the drive.
  • a comparator of the search device detects the object if the variable ratio differs from a predetermined ratio by more than a predetermined amount.
  • the push-pull measuring bridge is basically known from other applications in the prior art, for example from DE 10 2008 005 783 A1.
  • the push-pull measuring bridge can be field-compensated so that a large measuring range can be compatible with a high sensitivity of the search device. Furthermore, it is possible to measure differentially by means of the push-pull measuring bridge so that calibration by a user of the search device can be dispensed with.
  • the push-pull bridge may be used to alternatively measure by means of a magnetic or an electric field. The other component of the electromagnetic field goes to zero.
  • the first electromagnetic device may successively generate a magnetic field and an electric field in the region of the article.
  • the electromagnetic device can be a coil and an electrode which are successively connected to the push-pull bridge.
  • the push-pull measuring bridge can be constructed such that a field adjusts to a third electromagnetic device having the variable ratio with respect to the other two electromagnetic devices.
  • electrical characteristics of the first and second electromagnetic devices may be compared to determine the variable ratio.
  • the second electromagnetic device does not generate a field, but forms an electrical load for the push-pull bridge, which forms the variable ratio with the electrical load of the first electromagnetic device.
  • the search device may comprise a device for determining an electric field of the object, wherein the detection of the object takes place successively on the basis of the push-pull measuring bridge and the device.
  • the object is detected when detected by at least one of the three described approaches.
  • an output device of the search device can emit a signal upon detection of the object, which indicates on the basis of which type of field the object has been detected.
  • a first signal may indicate a measurement carried out by means of the push-pull measuring bridge and a magnetic field, a second signal a measurement made by means of the push-pull
  • the signal may be at least one of optical and acoustic.
  • the search device can have a multiplicity of first electromagnetic devices arranged next to one another, which are operated successively on the push-pull measuring bridge. Thereby, a detection of the object can be carried out in one or two dimensions, whereby the object can be located more precisely or a boundary of the object, such as a
  • the measurement results obtained by means of the different first electromagnetic devices are visualized by defining display areas on an optical output device, which areas are each assigned to one of the first electromagnetic devices.
  • the arrangement of the display areas preferably corresponds to the arrangement of the first electromagnetic devices.
  • a removal of the object from the search device may correspond to a color change of the optical output device.
  • the optical output device is simple and therefore inexpensive, for example in the form of a few light-emitting diodes, the color change can be used to display the measurement result more accurately with little effort, whereby multi-color LEDs can be used.
  • the optical output device is more complex, for example in the form of a color-capable graphic area output such as a graphics-capable liquid crystal display, then the removal of the object can be represented graphically by a false color display. Also in this case, the colored presentation of the measurement results can lead to an improved operability by a user.
  • the search device may include means for changing the predetermined amount by a user. This allows the user to adjust the sensitivity of the locator.
  • the adjustment of the predetermined amount may be performed in accordance with an amplification of control signals supplied to the first and second electromagnetic devices so that the generated electromagnetic fields are correspondingly amplified.
  • the predetermined amount may be switched between a plurality of predetermined values, such as two or three values, such that the searcher has different sensitivities that can be easily selected by the user.
  • the measuring surface is usually a substantially flat surface in the area of the search device, for example one Wall, in particular a lightweight wall, a ceiling or a floor.
  • a side of the search device facing the measuring surface is usually flat and the distance sensor monitors an at least approximate parallelism between the measuring surface and the search device. If the search device is not sufficiently flat on the measurement surface, the predetermined ratio can be adjusted in accordance with the deviation from the parallelism in order to keep the measurement result constant. Additionally or alternatively, a warning may be issued to the user of the search device.
  • the search device may also include a displacement sensor for detecting a displacement of the search device relative to the object, wherein the search device is adapted to associate a measurement result of the push-pull measuring bridge of a displacement position.
  • a displacement sensor for detecting a displacement of the search device relative to the object
  • the search device is adapted to associate a measurement result of the push-pull measuring bridge of a displacement position. This allows a user to sweep a measuring range with the search device and thereby record a variety of measurement results, which can then be graphically displayed, for example.
  • an image detail and / or a magnification level of the graphical representation may be selected and displayed on the optical display device of the searcher.
  • the search device may comprise a further push-pull measuring bridge with a further first and a further second electromagnetic device, wherein the first electromagnetic device of the push-pull measuring bridge generates an electromagnetic field with negligible magnetic proportion, while the first electromagnetic device of the further counterclockwise Measuring bridge generates an electromagnetic field with negligible electrical content to capture the object simultaneously on the basis of an electric and a magnetic field.
  • FIG. 2 shows a search device with the push-pull measuring bridge of FIG. 1;
  • FIG. 2 shows a search device with the push-pull measuring bridge of FIG. 1;
  • Fig. 3 different electromagnetic devices of the push-pull measuring bridge of Fig. 1;
  • FIG. 4 is a visualization of a graphical display of the search device of FIG. 2; FIG. and
  • FIG. 5 shows a view of an example search device according to FIG. 3.
  • FIG. 1 shows a block diagram of a push-pull measuring bridge 100.
  • the push-pull measuring bridge 100 is part of a search device 105 for detecting objects.
  • push-pull measuring bridge 100 can be used to detect a dielectric object, for example made of wood, or for detecting a metallic object, for example made of steel. In the following, the embodiment is described by means of which a dielectric object can be detected.
  • a clock generator 110 has two outputs at which it provides phase-shifted, preferably phase-shifted by 180 °, periodic alternating signals.
  • the alternating signals may in particular comprise square, triangular or sinusoidal signals.
  • the outputs of the clock generator are connected to a first controllable amplifier 15 and a second controllable amplifier 120, respectively.
  • Each of the controllable amplifier 1 15, 120 has a control input, via which it receives a signal which controls a gain of the controllable amplifier 1 15, 120.
  • An output of the first controllable amplifier 1 15 is connected to a first transmitting electrode 125 and an output of the second controllable amplifier 120 to a second transmitting electrode 130.
  • a receiving electrode 135 serves as a potential probe and is connected to an input amplifier 140; one in the region of the electrodes 125-135
  • the compensating network 165 is initially not considered and an impedance 170 is eliminated.
  • the input amplifier 140 is shown with a constant gain factor; however, in other embodiments, an amplification factor of the input amplifier 140 may also be controllable.
  • a spatial resolution and / or sensitivity of push-pull measuring bridge 100 can be influenced and controlled, for example, as a function of a measuring signal at input amplifier 140.
  • the output of the input amplifier 140 is connected to a synchronous demodulator 145.
  • the synchronous demodulator 145 is further connected to the clock generator
  • the synchronous demodulator 145 essentially switches the measurement signal received from the input amplifier 140 to its upper or lower output on the basis of the clock signal provided by the clock generator 110.
  • the two outputs of the synchronous demodulator 145 are connected to an integrator (integrating comparator) 150, shown here as an operational amplifier connected to two resistors and two capacitors.
  • integrator 150 shown here as an operational amplifier connected to two resistors and two capacitors.
  • Other embodiments are also possible, for example as an active low pass.
  • the signal is converted at the outputs of the synchronous demodulator 145 at one or more times within a half-wave analog to digital and then compared with the corresponding value from the next half-wave. The difference is integrated and e.g. again converted into an analog signal and used to control the amplifier 1 15, 120.
  • the integrator 150 integrates this signal over time and provides the result at its output. While the synchronous demodulator 145 provides the measurement signal received from the input amplifier 140 at its upper output, it is integrated by the integrator 150 inverted over time and the result at Output of the integrator 150 is provided.
  • the voltage at the output of the integrator 150 is the integral of the difference of the low-pass filtered outputs of the synchronous demodulator 145.
  • the signals provided at the outputs of the synchronous demodulator 145 are on average over time the same size and at the output of the integrator 150, a signal is provided, which goes to zero (ground).
  • the capacitances are unequal, for example because a dielectric object is arranged in the region of only one of the transmitting electrodes 125, 130, then the signals provided at the outputs of the synchronous demodulator 145 are no longer equal on average, and at the output of the integrator 150 becomes a positive one or negative signal provided.
  • the sign and the magnitude of the signal indicate the ratio of the capacitances, with a signal of zero corresponding to a ratio of one.
  • the signal provided by the integrator 150 is provided via a connection 155 to an evaluation and output device, not shown, of the beam finder 105.
  • the evaluation device may perform a comparison with a threshold value so that a user of the search device 105 receives an optical and / or acoustic output when the signal provided by the integrator 150 exceeds a predetermined threshold. In this case, the entire signal or an amount of the signal can be compared with the threshold value.
  • the signal provided by the integrator 150 is also used to control the gain factors of the controllable amplifiers 15 and 120, the second controllable amplifier 120 being directly connected to the output of the integrator 150 and the first controllable amplifier 15 being connected to the output by means of an inverter 160 of the integrator 150 is connected.
  • the inverter 160 effects a reversal of the signal provided to it in such a way that, as a function of the output signal of the integrator 150, the amplification factor of the first controllable amplifier 15 increases as the amplification factor of the second controllable amplifier 120 decreases or vice versa. It is also conceivable that only the amplification factor of one of the controllable amplifiers 1 15, 120, while maintaining the gain of the second controllable amplifier 120, 15 at a fixed value.
  • the amplification factors of the controllable amplifiers 1 15 and 120 increase or decrease until an AC voltage component that matches that at the transmitting electrodes
  • 125 and 130 adjacent alternating voltage is synchronous and applied to the receiving electrode, is minimized in amount.
  • the push-pull bridge 100 is a control circuit configured to maintain a predetermined ratio at the transmitting electrodes 125 and 130.
  • the predetermined ratio is predetermined by the structure and the arrangement of the transmitting electrodes 125 and 130 to each other or to the receiving electrode 135.
  • a variable ratio results from the capacitances formed at the transmitting electrodes 125 and 130 to the receiving electrode 135.
  • the signal provided by the integrator 150 is a control signal for compensating an asymmetric influence on the capacitances, such as the dielectric object.
  • the variable ratio at the electrodes is determined based on currents or voltages at the electrodes.
  • the compensation network 165 comprises at each of the transmitting electrodes 125, 130 a voltage divider consisting of two impedances.
  • the divided voltages are fed to the input amplifier 140 by means of a respective further impedance.
  • the receiving electrode 135 is not directly but guided to the input amplifier 140 by means of the impedance 170.
  • the impedances in the region of the first transmitting electrode 125 and the second transmitting electrode 130 are omitted from the representation in FIG. 1 by the compensation network 165.
  • the alternating voltages of the controllable amplifiers 1 15, 120 become between one on the first (single) transmitting electrode 125 applied capacity and one through the
  • Compensating network 165 balanced reference capacity formed.
  • the Reference capacitance is invariant to a dielectric object.
  • the first transmitting electrode 125 and the receiving electrode 135 are required.
  • the push-pull bridge 100 can be used in a three-electrode measuring operation using both transmitting electrodes 125 and 130, a first two-electrode measuring operation using the first transmitting electrode 125 and the receiving electrode 135 and a second two Electrode measuring operation using the second transmitting electrode 130 and the receiving electrode 135 are operated. Switching between the different measuring operations can be cyclic or controlled by a user. While in the two-electrode measuring operation, a voltage applied to the terminal 155 of the push-pull measuring bridge 100 in FIG.
  • Transmitting electrode indicates. If the article is moved past the electrodes, a signal with a change of sign results in the three-electrode measuring mode and a signal with a local maximum at the moment of passing in the two-electrode measuring mode.
  • push-pull bridge 100 may be used to detect a metallic object.
  • the first transmitting electrode 125 is replaced by a first transmitting coil 175, the second transmitting electrode 130 by a second transmitting coil 180.
  • the receiving element 135 is connected through a single receiving coil 185 or through a system of receiving coils, preferably two receivers connected in series. catch bobbins, replaced.
  • at least one of the coils is embodied as a conductor structure on a printed circuit board ("print coil").
  • the receiving electrode 135 is formed by a single magnetoresistive magnetic field sensor, preferably a Hall sensor, or by a system of magnetoresistive sensors, preferably two In a further embodiment, magnetoresistive magnetic field gradient sensors are used instead of the receiving electrode 135.
  • a single magnetoresistive magnetic field sensor preferably a Hall sensor
  • magnetoresistive magnetic field gradient sensors are used instead of the receiving electrode 135.
  • the transmit coils 175, 180 generate superimposed magnetic fields with periodically varying amplitudes and phases.
  • both transmit coils 175, 180 generate magnetic fields with equal amplitudes and parallel orientation of the main field directions in each half-wave of their supply voltage.
  • the sign of the magnetic fields changes from half-wave to half-wave.
  • the transmitting coils 175 and 180 are wound in opposite directions and their free ends are each connected to ground.
  • the voltage supply through the controllable amplifier 1 15, 120 takes place with respect to ground opposite voltages.
  • the transmit coils 175 and 180 in a half cycle generate magnetic fields of different amplitude and parallel or antiparallel orientation of the main field direction.
  • the amplitude and the sign of the magnetic field generated by the transmitting coil 175 in a half-wave corresponds to the amplitude or the sign of the magnetic field generated by the transmitting coil 180 in the preceding or subsequent half-wave.
  • the winding sense of the transmitting coils 175, 180 as well as the supply voltages of the transmitting coils 175, 180 are to be adapted accordingly to ground.
  • the reception coil 185 is arranged in the region of the transmission coils 175 and 180 such that it is exposed to the superimposed magnetic field of both transmission coils 175 and 180.
  • the arrangement of the coils 175 to 185 is selected such that the voltage induced in the receiver coil 185 by the magnetic fields of the transmitter coils 175 and 180 is zero, but at least constant, when the two controllable amplifiers 1 have 15 and 120 equal amplification factors.
  • the transmitting coils 175 and 180 are arranged coaxially in two parallel planes, and the receiving coil 185 is arranged in a third parallel plane having the same distance from each of the first two planes.
  • the transmitting coils 175 and 180 may be arranged in two parallel planes.
  • the two mutually connected receiving coils 185 can each be arranged in one of the two parallel planes, preferably such that the orientation and position of each of the transmitting coils 175, 180 corresponds to the orientation and position of each of the receiving coils 185.
  • Winding senses and circuits of the receiving coils 185 are determined from the condition that the voltage induced on the system of receiving coils 185 is zero when the two controllable amplifiers 15 and 120 have equal amplification factors. If the two transmit coils 175, 180 generate magnetic fields with the same amplitude and parallel orientation of the main field direction in each half-wave, and the sign of the magnetic fields changes from half-wave to half-wave, this condition is e.g. fulfilled when the two receiving coils 185 are connected in series and wound in opposite directions. If the two receiver coils 185 are operated in antiserial series connection, then the receiver coils 185 must be wound in the same direction. For the other cases described above of alternative, generated by the transmitting coils and superimposed magnetic fields resulting in appropriate combinations of interconnection of the receiving coils
  • the transmitting coils 175 and 180 are located at at least slightly axially or laterally staggered positions, so that a metallic object generally occupy different distances to the transmit coils 175 and 180.
  • a stay of the object in a plane between the transmitting coils 175 and 180, in which the object in the case of axially offset transmitting coils 175, 180 has the same distance to the transmitting coils 175 and 180, can be avoided by the arrangement of the transmitting coils 175 and 180 in the search device 105 , Due to the asymmetrical position of the object with respect to the transmitting coils 175 and 180, the object is influenced differently by the magnetic fields of the transmitting coils 175 and 180. Accordingly, the magnetic fields are also influenced differently by the metallic object, so that the superimposed magnetic fields in the receiving coil
  • Push-pull measuring bridge 100 compensates this asymmetry by, as stated above, driving one of amplifiers 1 15 and 120 to a higher amplification factor than the other of amplifiers 1 15, 120, until the superimposed magnetic field in the receiving coil 185 induced voltage has again reached zero.
  • the variable ratio between the transmitting coils 175 and 180 then no longer corresponds to 1 and the terminal 155 is at a non-zero voltage.
  • FIG. 2 shows a schematic illustration of the search device 105 with the push-pull measuring bridge 100 from FIG. 1.
  • the search device 105 includes a processing device 205, which is connected to the push-pull measuring bridge 105. Furthermore, the processing device 205 is connected to a voltage sensor 210 and a power controller 215, which in turn is connected to a battery 220 and a charging socket 225. In addition, the processing device 205 is connected to a data interface 230, an optical output device 235, an acoustic output device 240, an input device 245 and a position sensor 250.
  • first transmitting electrode 125 or the first transmitting coil 175 as the first electromagnetic device 190.
  • second transmitting electrode 130 and the second transmitting coil 180 as the second electromagnetic device 195 and the receiving electrode 135 and the receiving coil 185 as the third electromagnetic device 198 reference.
  • push-pull bridge 100 is constructed separately from processing device 205.
  • elements of push-pull measuring bridge 100 may also be formed by processing device 205.
  • the processing device 205 is preferably a conventional digital microcomputer with a power clock generator and program and data storage.
  • DAC digital-analog converters
  • ADC analog-to-digital converter
  • the processing device 205 may implement the clock generator 110, the controllable amplifiers 15 and 120, the synchronous demodulator 145, the integrator 150 and / or the inverter 160.
  • the evaluation of the signal provided at the terminal 155 of the push-pull measuring bridge 105 can be carried out by means of the processing device 205. This includes comparing the signal with a predetermined value and determining whether the difference between the signal and the predetermined value exceeds a predetermined level.
  • the functionalities described can also be implemented by discrete components, for example by analog electronic circuits or in the form of a user-specific IC (ASIC).
  • the voltage sensor 210 is a known sensor that detects an electromagnetic field generated by a live or live conductor. In one embodiment, only electromagnetic alternating fields of a predetermined frequency range are detected by the voltage sensor 210, for example in the frequency range above 20
  • the voltage sensor 210 determines the electromagnetic field due to the electric field applied to a measuring electrode of the voltage sensor 210 due to the electric field.
  • additional auxiliary sensors may be connected to the processing device 210 for improving a measurement result of the push-pull measuring bridge 100. This includes, for example, a sensor that determines whether the electromagnetic devices 190 to 198 are aligned in a required manner with respect to a measurement surface, in particular, whether distances between the measurement surface and the electromagnetic devices 190 to 198 are the same. A tilting of the search device 105 with respect to the measuring surface can be prevented.
  • the measuring surface is usually the surface of a body in which the object to be detected is received.
  • the body can be a wall or wall and the object hidden in it.
  • the power controller 215 provides the locator 105 with voltages required for operation. Usually, the electrical energy required for this purpose is taken from the battery 220. To charge the battery 220, the power controller 215 may be supplied with electrical power via the charging socket 225, the power controller 215 controlling and monitoring the charging of the battery 220. Operation of the locator 105 based on electrical energy supplied exclusively via the charging socket 225 is also possible.
  • the charging socket 225 is usually a low-voltage plug whose counterpart is connected to a power supply unit.
  • a charging station may be provided into which the search device 105 is inserted, the charging socket 225 being electrically connected to the power supply so that the battery 220 can be charged.
  • the power supply can also be included in the search device 105 and the charging socket 225 can be connected to the usual power grid.
  • Portions of the logic for powering the locator 105 and controlling the charging of the battery 220 may be implemented by the processor 205. Further, the processing means 205 may act on the power controller 215, for example in the form of an automatic shutdown of the locator 105 after a predetermined time in which the locator 105 has not been used, or in the form of a query of a current state of charge of the battery 220.
  • the processing device 205 can exchange information with an external device. Such information may relate to measurement results that have been collected or stored in a memory of the processing device 205.
  • the data interface 230 and the charging socket 225 can be designed to be integrated with each other.
  • the data interface 230 is a digital serial data interface, in particular a USB interface.
  • the optical output device 235 comprises a number of light-emitting diodes for visualizing a measurement result of the push-pull measuring bridge 100. Further light-emitting diodes for displaying internal states of the search device 105 can also be included, for example for indicating a state of charge of the battery.
  • the optical display device 235 comprises a graphic display, such as a liquid crystal display (LCD).
  • the LCD may include a backlight, such as LED or OLED, and may include a dot matrix area on which individual dots may be selectively displayed. Both the LCD and the backlight or light emitting diodes of the first embodiment may support multiple output colors.
  • the optical output device is designed in such a way that operation of the search device 105 is possible both in a light and in a dark environment.
  • the luminosity of the LED or the backlight of the LCD can be adapted to the lighting conditions in the environment.
  • the acoustic output device 240 may include a speaker or a piezo-transducer.
  • the representation of a measurement result of push-pull measuring bridge 100 can be emitted optically, acoustically or combined optically and acoustically by means of the optical output device 235 and the acoustic output device 240.
  • a position of a detected object may be displayed on the optical output device 235, while a characteristic noise from the acoustic output device 240 may indicate a metallic property of the article.
  • the color of the optically represented object may be at a distance, in particular special symbolize a depth of the object. Associations between the color and the sound to properties of the object (metallic, dielectric, live) may be changeable, in one embodiment also by a user of the search device 105.
  • the input device 245 By means of the input device 245, the user can operate the search device 105.
  • the input device 245 may include a number of keys that may be combined in a keyboard.
  • the input device 245 comprises only a single button, whereby a complete operability of the search device 105 is ensured by means of this one button.
  • the input device 245 may be partially or fully backlit.
  • the backlight may be coupled to a backlight of the optical output device 235.
  • the backlight may be user controlled.
  • the input device 245 may comprise further input means, in particular a rotary or slide control.
  • Such a controller may be sampled analog or digital and in particular serve for stepless or finely granular change of a parameter of the search device 105.
  • a sensitivity of push-pull measuring bridge 100 can be adjustable.
  • the input device 245 may be implemented in whole or in part with the optical output device 235 in the form of a touch-sensitive screen ("touchscreen").
  • the position sensor 250 serves to determine a position of the search device 105 with respect to the measurement surface by detecting a displacement of the search device 105 with respect to the measurement surface.
  • the detection can be one-dimensional or two-dimensional.
  • an acceleration sensor preferably a micromechanical acceleration sensor
  • an impeller may be arranged in the region between the search device 105 and the measuring surface, wherein a rotation of the impeller by the processing device 205 is converted into a displacement.
  • a mechanism similar to that in a computer mouse can be used by holding a trackball between the searcher 105 and the measurement surface and scanning a displacement of the finder 105 based on a movement of the trackball in two dimensions.
  • an optical scan similar to a optical position wherein the position sensor 250 comprises a camera which is directed onto the measuring surface, and the position sensor 250 converts a displacement of the image taken by the camera into a displacement of the search device 105 with respect to the measuring surface.
  • the conversion can also be carried out by the processing device 205.
  • a light source for example in the form of one or more light-emitting diodes, can be arranged.
  • push-pull measuring bridge 100 may also be included in the search device 105 and connected to the processing device 205.
  • different electromagnetic devices 190 to 198 controlled by the processing device 205, can be connectable to the one or more push-pull measuring bridges 100 so that measurements can be carried out by means of differently designed or situated electromagnetic devices 190 to 198.
  • FIG. 3 shows different arrangements of the electromagnetic devices 190 to 198 of the push-pull measuring bridge 100 from FIG. 1.
  • FIG. 3A shows a matrix-like arrangement.
  • the third electromagnetic element 198 forms the middle element of a 3x3 matrix whose remaining elements are formed by first and second electromagnetic devices 190, 195.
  • a first electromagnetic element 190 and a second electromagnetic element 195 are opposite each other.
  • 3B shows a honeycomb arrangement of electromagnetic devices 190 to 198.
  • the third electromagnetic device 198 has six instead of eight adjacent electromagnetic devices 190, 195.
  • the embodiment shown in FIG. 3B may be advantageous in that the coils approach the honeycomb shape rather than the rectangular shape in FIG. 3A.
  • a surface packing density of the electromagnetic devices 190 to 198 may be increased in a honeycomb arrangement.
  • FIG. 3A and 3B may be continued in any direction in the drawing plane.
  • a wiring of an electromagnetic device as the first, second or third electromagnetic device 190, 195 or 198 can be controlled dynamically.
  • an arbitrarily large arrangement of electromagnetic devices 190 to 198 can in principle be supported.
  • a plurality of push-pull measurement bridges 100 are provided in the search device 105, it is also possible to carry out a plurality of measurements at the same time, it being necessary to ensure a sufficient distance between active electromagnetic devices 190 to 198 in order to avoid mutual influences.
  • the electromagnetic devices 190 to 198 involved in a measurement need not adjoin one another but can be separated from one another by further, preferably non-interconnected, electromagnetic devices 190 to 198.
  • FIG. 3C shows an exemplary embodiment of a combined measuring element 310, which comprises a circular disk-shaped electrode 125 to 135, which is enclosed by a round coil 175 to 185. Centers of the electrodes 125-135 and the coils 175-185 coincide to detect objects having different characteristics (metallic, dielectric) with respect to the same position.
  • the measuring element 310 can be used in the arrangements shown in FIGS. 3A and 3B.
  • the voltage sensor 210 may be connected to one of the romagnetician devices 190 to 198 be executed integrated.
  • the voltage sensor can also be arranged on a side of the electromagnetic devices 190 to 198 facing away from the measuring surface. 4 shows a visualization of a graphical display of the search device 105
  • a graphical output 410 is divided into a number of display areas 420, 430 in a matrix-like manner.
  • the display areas 420 are bright, the display areas 430 are colored dark.
  • the dark colored display areas 430 represent positions where the object was detected. Instead of a subdivision into dark and light, it is also possible to use a greyscale or false color representation, wherein the gray level or color shown signals a removal of the object or a property of the object (metallic, dielectric, live).
  • Each of the display areas 420, 430 corresponds to a third electromagnetic device 198 in a matrix-like arrangement as in FIG. 3A.
  • the output 410 gives a visual impression of a size and location of the object to be detected.
  • symbolic additional display areas 420, 430 are located outside the output 410. These represent measurement results which were carried out and stored at different positions by means of the search device 105. By moving the measuring device 105 on the measuring surface, the detail displayed on the output 410 can be shifted over these stored measured values. Different graphical processing of the stored measured values can be carried out.
  • the measured values can each represent the variable ratio and a comparison with the predetermined ratio and a corresponding representation on the output 410 in light or dark can be performed "fresh" for the display regions 420, 430 in the region of the output 410
  • a user it is easily possible for a user to visualize a contour of the object on the output 410 by shifting the search device 105 relative to the measurement surface and adjusting the corresponding presentation parameter for the output 410.
  • the adaptation of the parameter can be carried out in particular by means of a sliding or rotary control.
  • a bar graph instead of the gray levels or colors of the display areas 420, 430, a bar graph may appear, wherein the length of a bar may correspond to a value of the variable ratio or its deviation from the predetermined ratio. This representation is particularly suitable for a one-dimensional displacement of the search device
  • stored display areas within the display can be magnified magnified, for example, such that a group of adjoining display areas 420, 430 visualize only one measured value.
  • FIG. 5 shows a view of an exemplary search device 105 corresponding to FIG. 2.
  • the search device 105 comprises only one button 245 as input device and three light-emitting diodes 235 as optical output device.
  • the search device 105 is accommodated in an approximately parallelepiped-shaped housing 510.
  • a USB socket is arranged as a combined data interface 230 and charging socket 225.
  • the light-emitting diodes 235 indicate a position of the object left and right of a center mark 520 on the housing 510.
  • Non-visible electromagnetic devices 190 to 198 are centered with respect to the center mark 520. If both light-emitting diodes 235 are equally bright, then the object is located uniformly below the middle mark 520. To find an edge of the object, the search device 105 must be displaced until the light-emitting diodes 235 shine differently brightly. Ideally, the edge of the article is immediately below the center mark 520 when one LED 235 is turned off and the other LED 235 has reached maximum brightness.
  • the button 245 controls all functions of the search device 105. In the simplest case, only a switch on and off of the search device by means of the button 245
  • search device 105 controlled.
  • Other functions of the search device 105 such as a switchover of a sensitivity, a calibration or an output of the state of charge of the battery 220, can also be controlled by pressing the button 245.

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  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • General Physics & Mathematics (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Electromagnetism (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Electronic Switches (AREA)

Abstract

L'appareil de recherche selon l'invention pour la détection d'un objet comprend un pont de mesure réciproque pour exciter un premier et un deuxième équipement électromagnétique dans un rapport variable, le premier équipement électromagnétique produisant un champ alternatif électromagnétique en fonction de l'excitation au voisinage de l'objet. L'appareil de recherche comprend en outre un comparateur pour la détection de l'objet, au cas où le rapport variable se différencierait d'un rapport prédéfini de plus d'une mesure prédéfinie.
EP11709919A 2010-05-07 2011-03-17 Appareil de recherche Ceased EP2567460A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010028719A DE102010028719A1 (de) 2010-05-07 2010-05-07 Suchgerät
PCT/EP2011/054016 WO2011138084A1 (fr) 2010-05-07 2011-03-17 Appareil de recherche

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EP2567460A1 true EP2567460A1 (fr) 2013-03-13

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EP11709919A Ceased EP2567460A1 (fr) 2010-05-07 2011-03-17 Appareil de recherche

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Country Link
US (1) US20130193955A1 (fr)
EP (1) EP2567460A1 (fr)
JP (1) JP5784107B2 (fr)
CN (1) CN102859873B (fr)
DE (1) DE102010028719A1 (fr)
WO (1) WO2011138084A1 (fr)

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Also Published As

Publication number Publication date
WO2011138084A1 (fr) 2011-11-10
CN102859873A (zh) 2013-01-02
JP5784107B2 (ja) 2015-09-24
DE102010028719A1 (de) 2011-11-10
US20130193955A1 (en) 2013-08-01
JP2013533952A (ja) 2013-08-29
CN102859873B (zh) 2016-01-13

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