EP1340047A1 - Dispositif et procede de detection de la position d'une cible - Google Patents

Dispositif et procede de detection de la position d'une cible

Info

Publication number
EP1340047A1
EP1340047A1 EP01991645A EP01991645A EP1340047A1 EP 1340047 A1 EP1340047 A1 EP 1340047A1 EP 01991645 A EP01991645 A EP 01991645A EP 01991645 A EP01991645 A EP 01991645A EP 1340047 A1 EP1340047 A1 EP 1340047A1
Authority
EP
European Patent Office
Prior art keywords
coil
target
code
detectors
sensor
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.)
Withdrawn
Application number
EP01991645A
Other languages
German (de)
English (en)
Inventor
Franz Hrubes
Heinrich Baumann
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.)
Micro Epsilon Messtechnik GmbH and Co KG
Original Assignee
Micro Epsilon Messtechnik GmbH and Co KG
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
Priority claimed from DE10154710A external-priority patent/DE10154710A1/de
Priority claimed from DE10158942A external-priority patent/DE10158942B4/de
Application filed by Micro Epsilon Messtechnik GmbH and Co KG filed Critical Micro Epsilon Messtechnik GmbH and Co KG
Publication of EP1340047A1 publication Critical patent/EP1340047A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/249—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using pulse code
    • G01D5/2492—Pulse stream
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/204—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils
    • G01D5/2046—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils by a movable ferromagnetic element, e.g. a core
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/204—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils
    • G01D5/2053—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils by a movable non-ferromagnetic conductive element

Definitions

  • the invention relates to a device for detecting the position of a target, with at least one sensor, the sensor having at least one transmitting device for generating a signal, and the target being detectable by means of the signal.
  • the invention further relates to a method for detecting the position of a target, with at least one sensor, the sensor having at least one transmission device for generating a signal and the target being detected by means of the signal.
  • targets are created using optical principles, e.g. the triangulation measurement.
  • Optical principles are particularly problematic in that they can only be used in particularly clean locations, since contamination of the optics results in large measurement errors.
  • Magnetically operating devices and methods are also known which are suitable for detecting a target.
  • magnetoresistive or magnetostrictive devices but also magnetically coded measuring rulers are known, which, however, are particularly problematic in that they become contaminated by attracted iron particles. An error-free measurement is therefore no longer possible.
  • LVDTs linear variable differential transformers
  • differential chokes cannot be used in many cases, particularly because of their large overall length.
  • Eddy current long-range sensors used to detect a target are also problematic because they are sensitive to magnetic fields and are difficult to adapt to different measuring ranges. Different measuring ranges therefore mostly require the use of different devices.
  • the present invention is based on the object of specifying a device and a method for detecting the position of a target of the type mentioned at the outset, which is insensitive to interference.
  • a device for detecting the position of a target is designed in such a way that the transmitting device is designed as a transmitting coil, by means of which an electromagnetic field can be generated as a signal, that the electromagnetic field can be detected by means of a receiving coil, and that for detecting the Targets the target can be arranged between the transmitting and receiving coil. Furthermore, the above object is achieved with regard to a method for detecting the position of a target by a method with the features of patent claim 25.
  • a method for detecting the position of a target of the type mentioned at the outset is such that the transmitting device is designed as a transmitting coil, by means of which an electromagnetic field is generated as a signal, that the electromagnetic field is detected by means of a receiving coil, and that for detecting the Targets the target is arranged between the transmitting and receiving coil.
  • a device for long measuring paths which is said to be insensitive to contamination by liquids, plastics, grease, dust or normal dirt, must have a transmitting device designed as a transmitting coil, by means of which an electromagnetic field can be generated which can be generated by means of a receiving coil is detectable.
  • the target is arranged between the transmitting and receiving coils.
  • the device is particularly insensitive to interference, since coils are particularly insensitive to contamination of any shape.
  • the device can also be produced very inexpensively and can be used as a mass article in the field of position detection. If the target were coupled to a car seat, for example, the device could be used in the automotive industry as a seat position detector for an automatic seat adjustment or position report.
  • the target is configured in its material properties and / or in its dimensions such that when the target is arranged between the transmitting coil and the receiving coil, the voltage induced in the receiving coil is detectably reduced and / or approximately zero.
  • the interference of the electromagnetic field by other fields, for example by the operation of cell phones in the immediate vicinity, would thus be immaterial, which means that the device would be particularly insensitive to such disturbances
  • the “absence” of the induced voltage also makes the device independent of installation tolerances or mechanical influences during operation in that the induced field is not being detected, which is related to the angle of the transmitting and receiving coil to one another and the distance between the transmitting coil.
  • the device is also insensitive to mechanical influences, such as bottles or cans under the car seat, which knock against the device, or blows with a rubber hammer during assembly, since the transmitter and receiver coil are insensitive.
  • the thickness of the target could be somewhat smaller than the distance between the transmitting coil and the receiving coil, so that the target can be carried out with play between the transmitting coil and the receiving coil.
  • the target could additionally or alternatively be made of metal, so that eddy currents could be generated in the target.
  • the coupling between the transmitting and receiving coils would then be significantly reduced. With the appropriate thickness of the target, the coupling factor between the transmitting and receiving coils thus goes to zero. Small tolerances of the distance between the target and the transmitting or receiving coil are therefore not critical, since only the shielding of the target from the receiving coil now plays an essential role. This again allows installation tolerances perpendicular to the measuring direction without influencing the reliability of the detection. Due to the principle, there is a very large measurement signal, which is again insensitive to interference from electromagnetic fields.
  • the sensor could have several transmitter coils. In addition or as an alternative to this, the sensor could also have a plurality of receiving coils. The number of detectable positions could then be determined very easily via the number of transmitting or receiving coils. The number of transmit coils could correspond to the number of receive coils.
  • a sensor configured in this way is particularly insensitive to interference, since each electromagnetic field generated by a transmitter coil would be assigned a receiver coil detecting the field, and the presence of the target would thus be particularly easy to detect.
  • the number of transmitting coils could also be different from the number of receiving coils.
  • the sensor could have, for example, only one transmitter coil and / or only one receiver coil. In a specific embodiment, this could look such that the receiving coil and / or the transmitting coil is combined into a single coil. It would be possible to combine the individual coils in a series or in a parallel connection or to use a single elongated coil. The length of the coil could then correspond to the length of the coils arranged next to one another.
  • the target could be designed as a coded ruler. This would drastically reduce the number of transmit and receive coils.
  • the ruler could in this case comprise individual plates which are arranged at certain distances from one another.
  • the ruler could also include non-conductive areas. are realized, for example, by cutouts in the ruler.
  • One possibility of designing the target in a particularly simple manner would be punching out gaps from a sheet metal strip. This would implement a particularly inexpensive form of the target. The length of the sheet metal strip would then determine the path length, which would be only slightly longer than the measuring path.
  • the code could have at least one line. However, it could also be two or more cells to increase the detectable positions. In order to be able to adapt the device particularly well to the respective place of use, the code could be designed non-linear. This would make it possible to detect more positions in certain areas of the measuring range than in others. In order to increase the detectable positions again, the transmitter coils and / or the receiver coils could also be arranged at different distances from one another. It is also conceivable that the arrangement of the transmitting and / or receiving coils is configured in two or more cells.
  • the transmitter coil An could be supplied with an alternating voltage with a constant amplitude.
  • the amplitude of the voltage induced in the receiving coil would depend on the coupling between the transmitting and receiving coils and thus on the distance between the transmitting and receiving coils, but it would be largely independent of the transmitting frequency as long as it does not approach the natural resonance frequency of the receiving coil (f r ⁇ s ⁇ f / 10).
  • it is temperature-independent - apart from the thermal change in distance between the transmitting and receiving coils, which, however, has only a minor influence - and is independent of magnetic influences or contamination from electrically non-conductive material.
  • the transmitter coil An could be fed, preferably independently of one another, by means of a constant frequency. If a target whose size is selected so that the coupling between a pair of transmit and receive coils approaches zero, is moved along the row arrangement between the individual pairs of transmit and receive coils, the individual receive coils in turn receive less signal. This effect is then used to detect the absolute position of the target.
  • the individual voltages which are preferably successively induced in the receiving coils, then do not show a flat and slight drop when the target is inserted, but rather a steep drop that goes to zero as soon as the target is exactly in the middle position.
  • the transmitter coil (s) could also be fed, preferably essentially simultaneously, by means of different frequencies. Collective coupling of adjacent transmit coils into the receive coil shielded from the target could thus be effectively avoided. The drop in the amplitude of the alternating voltage induced in the receiving coil would thus be particularly pronounced and the position of the target would thus be particularly easy to detect.
  • the signal (s) of the receiving coil could then be evaluated by means of a frequency filter, so that the signal (s) of the receiving coil (s) could be clearly assigned to a signal of the transmitting coil.
  • the individual frequencies with which the transmitting coil (s) are fed could be filtered out again, so that a clear association between the transmitting and receiving coil is possible. Any method known in the prior art could be used to filter the individual frequencies.
  • the drop in the voltage induced in the receiving coil / s could be detectable in the case of a target arranged between transmitting coil and receiving coil An by means of at least one level detector, in particular a comparator, a Schmitt trigger or the like. This would allow a clear detection of the position by a logic signal.
  • a level detector could be assigned to each pair of transmit and receive coils, or only one level detector could be provided in the case of a single receive coil.
  • the threshold value or the threshold values of the level detector (s) could be selected such that at least one level detector delivers an output signal when the target is arranged between at least one transmitting coil and one receiving coil. A clear detection of the position could thus be achieved.
  • several threshold values for example three threshold values, could also be detectable by means of the level detectors. With help of a A / D converter, this could be expanded in a number of stages, and a characteristic curve adaptation by means of a computer would then significantly increase the resolution and / or the accuracy.
  • two level detectors could deliver an output signal in the case of a target arranged between at least two transmitter coils and at least two receiver coils.
  • the resolution and the accuracy of the detection of the position could thus be increased in a simple manner. If the target is between two adjacent pairs of transmit and receive coils that have a tolerance range of half a distance, i. H. Having center to center, between two coils, both receiving coils with the associated comparators deliver the same logic signal. This additional logic decision thus results in a resolution that is twice as large as the number of transmit and receive coil pairs, and the accuracy is also - almost - twice as large. If the transmit and receive coil pairs are now fed in succession, the sensitivity to interference is reduced, since a full change in amplitude can always be evaluated.
  • control of the transmitter coil (s) and / or the evaluation of the voltages induced in the receiver coil (s) An could take place by means of evaluation electronics, in particular by means of a microprocessor. All of the electronics could essentially be implemented using digital components, preferably using CMOS technology and / or without using special analog components. Electronics designed in this way could be implemented very inexpensively. As a result, a complete solution as an ASIC would also be possible without any problems, in which case the device could also be used as a mass product in the price-problematic automotive sector.
  • the transmitter coils and / or receiver coils could be arranged on at least one printed circuit board.
  • the circuit board could be designed as flexible circuit boards and / or the transmitter coil An and / or the receiver coil A-n could be printed and / or etched on the circuit board.
  • the evaluation electronics or the microprocessor with the transmitter coil (s) and / or the receiver coil (s) could be arranged on a printed circuit board. This could provide a direct connection to the evaluation electronics and / or to the microprocessor.
  • the transmitter coils and the receiver coils could be arranged along an arc segment, so that angle measurements would be possible.
  • the target would then also have a curvature that corresponds to the curvature of the arc segment.
  • any angle measurements would be possible, in particular with the same electronics.
  • the electronics unit could thus also be used for the angle measurement of the backrest at the same time if the respective transmitter and receiver coil pairs used for linear and angle measurement were made separately.
  • the method according to the invention for detecting the position of a target could serve, in particular, to operate a device for detecting the position of a target in accordance with the above statements. It is advantageous in the method that the susceptibility to failure of a device for detecting the position of a target is reduced.
  • the absolute resolution / accuracy is 0.5 cm. With a measuring path of 5 m, this corresponds to the absolute resolution / accuracy of 0.1%, with a required overall length of the sensor of approx. 9 cm with nine required transmitting and receiving coil pairs.
  • the same absolute resolution / accuracy can be achieved with a single additional If the transmitter and receiver coils are paired, the overall length of the sensor would then be 10 cm, they can be extended to a measuring path of 10 meters.
  • a device for detecting the position of a measurement object the position preferably being an absolute position, with at least one sensor which has at least two detectors for detecting the measurement object, the position of the measurement object and / or an object being coded by means of a code wherein the measurement object and / or the sensor is coupled to the object, the object being arranged movably with respect to the measurement object and / or the sensor and the code extending essentially in the direction of movement of the object, with the device according to the invention or can be used with the method according to the invention according to claim 25.
  • a method for detecting the position of a measurement object the position preferably being an absolute position, having at least one sensor which has at least two detectors for detecting the measurement object, the position of the measurement object and / or an object being coded by means of a code the measurement object and / or the sensor being coupled to the object, the object being moved with respect to the measurement object and / or the sensor and the code extending substantially in the direction of movement of the object, are used to operate an above-mentioned device.
  • Devices and methods for detecting the position of a measurement object are well known in practice. Often contactless sensors are used, which are adapted to the respective location.
  • sensors that digitize as early as possible are known from practice. These sensors work with detectors attached in parallel.
  • One of the most relevant examples in practice are sensors for optical angle coding. These sensors work, for example, with eight concentric measurement tracks, which are etched in the Gray code, the measurement tracks being optically scanned.
  • Such sensors can of course also be used for linear movements by applying the code on foils, for example wise in the form of coding tapes.
  • These coding tapes are particularly problematic in that they are either not suitable for harsh operating conditions, because they are not very robust, or because they are too expensive if they are designed to be robust enough.
  • the present invention is therefore also based on the object of specifying a device and a method for detecting the position of a measurement object of the type mentioned at the outset, which can be used in a large number of environments, in particular in spatially restricted locations.
  • the above object is achieved by a device and a method for detecting the position of a measurement object with the features of claims 26 and 38, respectively.
  • a device and a method for detecting the position of the type mentioned at the outset are designed in such a way that the detectors extend essentially in the direction of movement of the object.
  • the detectors are not - as is customary in the prior art.
  • lent - must be arranged vertically to the direction of movement, but that the detectors must be aligned essentially in the direction of movement, ie horizontally in the case of linear movements.
  • the device according to the invention can thus have a much lower overall height and is particularly well suited to be used in spatially restricted environments. With suitable coding with only n detectors, 2 bei n positions can therefore be detected.
  • adaptation to different measuring paths is possible without changing the electronics.
  • the code could be applied to a ruler.
  • the ruler could be designed as a sheet metal strip, into which the code could be inserted by punching out spaces from the sheet metal strip. The length of the metal strip would then determine the path length that would be only slightly longer than the measuring path (1 + n * 2 ⁇ (-n)).
  • the code could be designed as a single or multi-track code, preferably as a binary code.
  • the code is designed as a multi-track code, it differs from the known Gray code in that far more positions can be detected with the same number of tracks. With an increasing number of tracks, the number of detectable positions increases considerably.
  • the raster width of the code could be configured essentially linear. This would give a particularly simple type of coding. Alternatively, the raster width of the code could also be configured essentially non-linear. In a particularly advantageous manner, the raster width of the code could be configured depending on the positions of the measurement object. This would have the consequence that the Code could be particularly well matched to the respective location. For example, it is conceivable that the positions of the measurement object must be able to be determined more precisely in some areas of the measurement path than in other areas. Such special features could be taken into account by means of a grid width that depends on the position of the measurement object. For certain areas of application, however, the code could also be partially non-linear and partially linear. This would again make it possible to adapt the code particularly well to any possible application.
  • the distance between the detectors could correspond to the raster width of the code. This means that if a detector is outside its tolerance range in which it delivers an undetermined result, all other detectors are also outside their tolerance range and thus deliver a correct result corresponding to the position in the code.
  • the positions could be rasterized, so that not all detectors have to change the state at the same time. A detection would only take place if the sensor and thus the detectors are in defined positions. As a result, an absolutely simultaneous change of state of the detectors is not necessary.
  • the spacing of the detectors from one another could not correspond to the grid width of the code.
  • the detectors could be at a distance from one another that is smaller than the grid of the code.
  • the detectors could then be arranged such that only one detector is in its tolerance range at a time and can therefore achieve an undefined state. If a detector leaves its tolerance range, then at most another detector enters its tolerance range.
  • the tolerance range could be defined as 1 / (n + 1), where n is the number of detectors.
  • the width of the individual states can be seen as the grid width of the code.
  • the spacing of the detectors from one another partly corresponds to the grid width and partly does not correspond to the grid width of the code. This would be of particular advantage if the various positions of the measurement object were not distributed uniformly on the measurement path.
  • the detectors could be arranged linearly, preferably in the direction of movement of the object, in one or more lines.
  • the detectors could thus be adapted to the code.
  • a two-lane code could then be scanned using detectors arranged in two lines.
  • the detectors it would also be possible for the detectors to additionally detect the code at an angle to the direction of movement, for example perpendicularly. It would thus be possible to use two-line detectors to detect a two-line code or to use a code matrix.
  • the detectors could be able to detect transitions in the code in one or more stages.
  • the detectors could have at least a third state, for example 0, Vz and 1, where Vz is a transition.
  • the detectors could also have two or more additional states, for example 0, 1/3, 2/3 and 1.
  • the detectors could be designed as binary detectors. This would be particularly desirable in view of inexpensive production, since binary detectors are very cheap to manufacture.
  • the detectors could also be designed as non-contact detectors. Almost all known measuring principles, in a particularly advantageous manner contactlessly working measuring principles, which can be handled under the special operating conditions, could be used. In particular with non-contact measuring principles, the sensor would then be almost wear-free and the measurement results would be particularly independent of installation tolerances.
  • the detectors could be designed as a transmitting and receiving coil, it being possible to generate an electromagnetic field by means of the transmitting coil, which can be detected by means of the receiving coil.
  • the measurement object - for example the code inserted in the ruler - could then be arranged between the transmitting and receiving coil, in such a way that at logical 1 the receiving coil against the electromagnetic field of the Transmitter coil is shielded.
  • the device for detecting a measurement object comprises a sensor which has eight detectors for detecting the measurement object.
  • the detectors detect the absolute position of an object, in this case a car seat.
  • the position of the car seat is coded and the sensor is coupled to the car seat.
  • the car seat is arranged to be movable with respect to the measurement object, which in this exemplary embodiment is coupled to the guide rails of the car seat.
  • the measurement object and thus the code essentially extend in the direction of movement of the object.
  • the measurement object is designed as a sheet metal strip, into which the code is inserted by punching out gaps from the sheet metal strip.
  • the code is a single-track binary code whose raster width is linear and therefore uniform. This means that the respective individual states 0 and 1 have the same width across the entire ruler.
  • the distance between the detectors does not correspond to the grid width of the code, but to a fraction of the grid width, namely 8/9 the uniform grid width of the code.
  • the detectors are designed in such a way that they can detect the code transition in an intermediate stage and that only one detector can have a transition between two adjacent bits in its tolerance range. The tolerance range should therefore be maximum. So if the eighth sensor just leaves its tolerance range, then the first sensor enters its tolerance range.
  • a tolerance range of 1/5 can be achieved by means of seven detectors, which can detect three states, the transition range is +/- 1/5 and the 1/0 range is therefore 3/5. The highest number of positions can currently be detected by means of such a device.
  • FIG. 1 is a perspective view, partially and schematically, of a first exemplary embodiment of a device according to the invention for detecting the position of a target
  • FIG. 2 in a perspective view, partially and schematically, a second embodiment of a device according to the invention.
  • FIG. 3 in a perspective view, partially and schematically, a further embodiment of a device according to the invention with a coded target.
  • the device comprises a sensor, the sensor having a transmitting device 1 for generating a signal and the target 2 being detectable by means of the signal.
  • the transmitting device 1 is designed as a Coil 3 designed by means of which an electromagnetic field can be generated.
  • the electromagnetic field in turn can be detected by means of a receiving coil 4 and for the detection of the target 2 the target 2 is arranged between the transmitting 3 and receiving coil 4.
  • the material properties of the target 2 are designed such that when the target 2 is arranged between the transmitting coil 3 and the receiving coil 4, the voltage U e induced in the receiving coil 4 is approximately zero.
  • the target 2 is here, for example, with the movement of an object, not shown here, e.g. B. coupled a car seat, and designed to be movable in the direction of the arrows. If the object moves, the target 2 is moved along the direction of the arrow, so the position of the object correlates with the position of the target, so that the target 2 is arranged in a specific position between the transmitting coil 3 and the receiving coil 4 when the object is stationary , In this exemplary embodiment, a position of the target 2 would thus be detectable.
  • FIG. 2 also shows a perspective view, partially and schematically, of a device for detecting the position of a target 2.
  • the device also has a sensor, the sensor having five transmitter coils 3 and five receiver coils 4.
  • the number of transmitting coils corresponds to the number of receiving coils 4, whereby detection that is particularly insensitive to interference is achieved.
  • FIG. 3 shows a sensor according to the exemplary embodiment in FIG. 2 with a coded ruler.
  • the coded ruler is easily realized by punching out gaps from a sheet metal strip and is therefore very inexpensive.
  • the length of the metal strip determines the length of the measuring path. This solution allows measurement paths of many meters.
  • the ratio of the overall length of the device to the measuring path becomes more and more favorable with the same dimensions of the transmitting and receiving coils as the measuring path increases.

Abstract

L'invention concerne un dispositif de détection de la position d'une cible, à l'aide d'au moins un capteur, ledit capteur présentant au moins une unité d'émission (1) conçue pour produire un signal, au moyen duquel la cible (2) peut être détectée. Ce dispositif est conçu en considération d'une insensibilité aux influences perturbatrices, de manière que l'unité d'émission se présente sous la forme d'une bobine émettrice (3), grâce à laquelle un champ électromagnétique peut être produit en tant que signal. Ce dispositif est également conçu, de sorte que le champ électromagnétique peut être détecté à l'aide d'une bobine réceptrice (4) et la cible (2) peut être placée entre la bobine émettrice (3) et la bobine réceptrice (4) pour la détection de la cible (2).
EP01991645A 2000-12-08 2001-12-07 Dispositif et procede de detection de la position d'une cible Withdrawn EP1340047A1 (fr)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
DE10061492 2000-12-08
DE10061492 2000-12-08
DE10061493 2000-12-08
DE10061493 2000-12-08
DE10154710A DE10154710A1 (de) 2000-12-08 2001-11-09 Vorrichtung und Verfahren zur Detektion der Position eines Targets
DE10154710 2001-11-09
DE10158942A DE10158942B4 (de) 2000-12-08 2001-12-03 Vorrichtung und Verfahren zur Detektion der Position eines Messobjekts
DE10158942 2001-12-03
PCT/DE2001/004657 WO2002046704A1 (fr) 2000-12-08 2001-12-07 Dispositif et procede de detection de la position d'une cible

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US20060048583A1 (en) 2004-08-16 2006-03-09 Gysling Daniel L Total gas meter using speed of sound and velocity measurements
DE102006020051A1 (de) * 2006-04-26 2007-11-08 Soehnle Professional Gmbh & Co. Kg Kraftmessvorrichtung
FR2916270B1 (fr) * 2007-05-15 2009-08-28 Thales Sa Capteur pouvant detecter la presence d'une piece magnetique et machine electrique comprenant un tel capteur
CN109075690B (zh) * 2016-03-13 2021-05-11 伺服圣斯(Smc)有限公司 位置编码器
CN113655531B (zh) * 2021-08-10 2022-09-13 浙江大学 一种基于高频电磁场的周边目标探测定位装置和方法

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FR2637683B1 (fr) * 1988-10-10 1994-03-25 Gec Alsthom Sa Dispositif pour la mesure de la position angulaire et du deplacement lineaire de deux pieces l'une par rapport a l'autre
DE4011729A1 (de) * 1990-04-11 1991-10-17 Fev Motorentech Gmbh & Co Kg Positionsaufnehmer
DE9320124U1 (de) * 1993-12-27 1994-02-10 Radovic Zoran Induktiver Weggeber mit großem linearen Bereich
DE19504307A1 (de) * 1995-02-09 1996-08-14 Siemens Ag Einrichtung zur Erfassung von Position und/oder Geschwindigkeit eines beweglichen Geräteteils
US5731702A (en) * 1996-08-21 1998-03-24 General Motors Corporation High accuracy angle based rotation sensor with time based back up
US5841274A (en) * 1997-01-29 1998-11-24 Mitutoyo Corporation Induced current absolute position transducer using a code-track-type scale and read head
FR2777649A1 (fr) * 1998-04-16 1999-10-22 Jean Pierre Bazenet Dispositif de mesure incrementale de deplacement et de position de deux objets mobiles en translation l'un par rapport a l'autre

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