Inductive non-contact measurement of a relative movement or relative positioning of a first object relative to a second object
First Claim
1. A non-contact measurement method for a relative displacement or relative positioning of a first object relative to a second object, in which:
- at least one transmitting coil, placed on the first object, is excited by an alternating excitation signal,at least two alternating electronic output signals, generated by mutual inductance in at least two receiving coils, are detected;
said at least two receiving coils being placed on said second object and in a magnetic field created by said at least one transmitting coil,the relative displacement of the first object is determined relative to the second object using said at least two alternating electric output signals generated on said at least two receiving coils,an axial displacement is determined by measuring a continuous axial voltage Va that is proportional to a monotone function of mutual inductance M between one of said at least one transmitting coil and one of said at least two receiving coils,said at least two receiving coils generate, respectively, an alternating voltage va that is proportional to mutual inductance Ma between a first of said at least two receiving coils and one of said at least one transmitting coil, and an alternating voltage vb that is proportional to the mutual inductance Mb between a second of said at least two receiving coils and one of said at least one transmitting coil,a radial displacement is determined by measuring a continuous radial voltage Vr proportional to the relation (Ma−
Mb)·
f(Ma+Mb);
where (Ma−
Mb) is the difference between mutual inductances Ma and Mb, where f(Ma+Mb) is a monotone function of the sum (Ma+Mb) of mutual inductances Ma and Mb;
where Ma is the mutual inductance between one of said at least one transmitting coil and a first of said at least two receiving coils, where Mb is the mutual inductance between one of said at least one transmitting coil and a second of said at least two receiving coils.
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Accused Products
Abstract
A non-contact measurement method for a relative displacement or relative positioning of a first object relative to a second object, in which: at least one transmitting coil, placed on the first object, is excited by an alternating excitation signal, at least one alternating electronic output signal, generated by mutual inductance in at least one receiving coil, is detected; the at least one receiving coil being placed on the second object and in a magnetic field created by the at least one transmitting coil, and the relative displacement of the first object is determined relative to the second object using the at least one alternating electric output signal generated on the at least one receiving coil.
47 Citations
40 Claims
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1. A non-contact measurement method for a relative displacement or relative positioning of a first object relative to a second object, in which:
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at least one transmitting coil, placed on the first object, is excited by an alternating excitation signal, at least two alternating electronic output signals, generated by mutual inductance in at least two receiving coils, are detected;
said at least two receiving coils being placed on said second object and in a magnetic field created by said at least one transmitting coil,the relative displacement of the first object is determined relative to the second object using said at least two alternating electric output signals generated on said at least two receiving coils, an axial displacement is determined by measuring a continuous axial voltage Va that is proportional to a monotone function of mutual inductance M between one of said at least one transmitting coil and one of said at least two receiving coils, said at least two receiving coils generate, respectively, an alternating voltage va that is proportional to mutual inductance Ma between a first of said at least two receiving coils and one of said at least one transmitting coil, and an alternating voltage vb that is proportional to the mutual inductance Mb between a second of said at least two receiving coils and one of said at least one transmitting coil, a radial displacement is determined by measuring a continuous radial voltage Vr proportional to the relation (Ma−
Mb)·
f(Ma+Mb);
where (Ma−
Mb) is the difference between mutual inductances Ma and Mb, where f(Ma+Mb) is a monotone function of the sum (Ma+Mb) of mutual inductances Ma and Mb;
where Ma is the mutual inductance between one of said at least one transmitting coil and a first of said at least two receiving coils, where Mb is the mutual inductance between one of said at least one transmitting coil and a second of said at least two receiving coils. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A non-contact measurement method for a relative displacement or relative positioning of a first object relative to a second object, in which:
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at least two transmitting coils, placed on the first object, are excited by an alternating excitation signal, at least one alternating electronic output signal, generated by mutual inductance in at least one receiving coil, is detected;
said at least one receiving coil being placed on said second object and in a magnetic field created by said at least two transmitting coils,the relative displacement of the first object is determined relative to the second object using said at least one alternating electric output signal generated on said at least one receiving coil, an axial displacement is determined by measuring a continuous axial voltage Va that is proportional to a monotone function of mutual inductance M between a transmitting coil of said at least two transmitting coils and a receiving coil of said at least one receiving coil, for a given coil position of two transmitting coils of said at least two transmitting coils and one receiving coil, an inductance equilibrium voltage is determined at the output of the receiving coil, and the radial position of the two objects is triggered by said equilibrium voltage. - View Dependent Claims (22, 23)
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24. A system for measuring relative displacement or relative positioning of a first object relative to a second object, comprising:
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at least two transmitting coils placed on said first object, at least one receiving coil placed on the second object, means of excitation for said at least two transmitting coils into an alternating excitation signal, means of processing for recovering at least one alternating electric output signal, generated by mutual inductance in one of said at least two receiving coils, and for determining the relative displacement of the first object in relation to the second object using said alternating electric output signal generated on said receiving coil, a transmitting coil of said at least two transmitting coils and a receiving coil of said at least one receiving coil for measuring an axial displacement of objects by determining an axial voltage Va that is proportional to a monotone function of the mutual inductance between said coils, two transmitting coils of said at least two transmitting coils powered by two opposite excitation signals to control radial positioning. - View Dependent Claims (25)
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26. A system for measuring relative displacement or relative positioning of a first object relative to a second object, comprising:
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at least one transmitting coil placed on said first object, at least two receiving coils placed on the second object, means of excitation for said at least one transmitting coil into an alternating excitation signal, means of processing for recovering at least one alternating electric output signal, generated by mutual inductance in one of said at least one receiving coil, and for determining the relative displacement of the first object in relation to the second object using said alternating electric output signal generated on said receiving coil, a transmitting coil of said at least one transmitting coil and a receiving coil of said at least two receiving coils for measuring an axial displacement of objects by determining an axial voltage Va that is proportional to a monotone function of the mutual inductance between said coils, wherein said means of processing comprise means of calculation for determining a continuous voltage Vr which represents a radial displacement and which is proportional to the relation (Ma−
Mb)·
f(Ma+Mb);
where (Ma−
Mb) is the difference of mutual inductances Ma and Mb, f(Ma+Mb) is a monotone function of the sum (Ma +Mb) of mutual inductances Ma and Mb;
where Ma is the mutual inductance between one of said at least one transmitting coil and a first of said at least two receiving coils, where Mb is the mutual inductance between one of said at least one transmitting coil and a second of said at least two receiving coils. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A system for measuring relative displacement or relative positioning of a first object relative to a second object, comprising:
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at least one transmitting coil placed on said first object, at least two receiving coils placed on the second object, means of excitation for said at least one transmitting coil into an alternating excitation signal, means of processing for recovering at least one alternating electric output signal, generated by mutual inductance in one of said at least one receiving coil, and for determining the relative displacement of the first object in relation to the second object using said alternating electric output signal generated on said receiving coil, a transmitting coil of said at least one transmitting coil and a receiving coil of said at least two receiving coils for measuring an axial displacement of objects by determining an axial voltage Va that is proportional to a monotone function of the mutual inductance between said coils, wherein said means of processing comprise means of calculation for determining a continuous axial voltage Va which represents an axial displacement and which is proportional to a monotone function of the sum of the mutual inductances Ma and Mb, where Ma is the mutual inductance between a transmitting coil of said at least one transmitting coil and a first receiving coil of said at least two receiving coils, and where Mb is the mutual inductance between a transmitting coil of said at least one transmitting coil and a second receiving coil of said at least two receiving coils, and, wherein said means of calculation comprises; an adder for adding the sum of alternating voltages va+vb of said first and second receiving coils with a reference voltage Vref, a demodulator for demodulating the signal emitted by said adder, an integrator for generating continuous axial voltage Va using the signal emitted by the demodulator, and a multiplier that is powered by the continuous axial voltage Va and the reference voltage Vref so that said excitation signal is generated;
where the relative motion is a function of the value of Va for which the output of said adder is null.
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37. A system for measuring relative displacement or relative positioning of a first object relative to a second object, comprising:
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at least one transmitting coil placed on said first object, at least two receiving coils placed on the second object, means of excitation for said at least one transmitting coil into an alternating excitation signal, means of processing for recovering at least one alternating electric output signal, generated by mutual inductance in one of said at least one receiving coil, and for determining the relative displacement of the first object in relation to the second object using said alternating electric output signal generated on said receiving coil, a transmitting coil of said at least one transmitting coil and a receiving coil of said at least two receiving coils for measuring an axial displacement of objects by determining an axial voltage Va that is proportional to a monotone function of the mutual inductance between said coils, wherein said means of processing comprise means of calculation for determining a continuous axial voltage Va which represents an axial displacement and which is proportional to a monotone function of the sum of the mutual inductances Ma and Mb, where Ma is the mutual inductance between a transmitting coil of said at least one transmitting coil and a first receiving coil of said at least two receiving coils, and where Mb is the mutual inductance between a transmitting coil of said at least one transmitting coil and a second receiving coil of said at least two receiving coils, and, said means of calculation comprises; a multiplier adder for adding a reference voltage Vref to a feedback signal multiplied by the sum va+vb of voltages generated by said first and second receiving coils, a demodulator for demodulating the signal emitted by said multiplier, and an integrator for generating the continuous axial voltage Va using the signal emitted by the demodulator, where the feedback signal is the continuous axial voltage Va; and
where the relative displacement is a function of the value of the continuous axial voltage Va for which the output of said multiplier is null.
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38. A system for measuring relative displacement or relative positioning of a first object relative to a second object, comprising:
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at least one transmitting coil placed on said first object, at least one receiving coil placed on the second object, means of excitation for said at least one transmitting coil into an alternating excitation signal, and means of processing for recovering at least one alternating electric output signal, generated by mutual inductance in said at least one receiving coil, and for determining the relative displacement of the first object in relation to the second object using said alternating electric output signal generated on the receiving coil, wherein; said means of processing comprises means of calculation for determining a continuous voltage Vr which represents a radial displacement and which is proportional to the relation (Ma−
Mb)·
f(Ma+Mb);
where (Ma−
Mb) is the difference of mutual inductances Ma and Mb, f(Ma+Mb) is a monotone function of the sum (Ma+Mb) of mutual inductances Ma and Mb;
where Ma is the mutual inductance between the transmitting coil and a first receiving coil, where Mb is the mutual inductance between the transmitting coil and a second receiving coil, andsaid means of calculation comprises (i) an adder for adding the difference in alternating voltages Va−
Vb of two receiving coils with a feedback signal, (ii) a demodulator for demodulating the signal emitted from said adder, (iii) an integrator for generating the continuous radial voltage Vr using the signal generated by the demodulator, and (iv) a multiplier powered by continuous radial voltage Vr and a reference voltage Vref for generating said feedback signal;
where the relative displacement is a function of the value of the continuous radial voltage Vr for which the output of said multiplier is null. - View Dependent Claims (39)
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40. A system for measuring relative displacement or relative positioning of a first object relative to a second object, comprising:
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at least one transmitting coil placed on said first object, at least one receiving coil placed on the second object, means of excitation for said at least one transmitting coil into an alternating excitation signal, and means of processing for recovering at least one alternating electric output signal, generated by mutual inductance in said at least one receiving coil, and for determining the relative displacement of the first object in relation to the second object using said alternating electric output signal generated on the receiving coil, wherein; said means of processing comprises means of calculation for determining a continuous voltage Vr which represents a radial displacement and which is proportional to the relation (Ma−
Mb)·
f(Ma+Mb);
where (Ma−
Mb) is the difference of mutual inductances Ma and Mb, f(Ma+Mb) is a monotone function of the sum (Ma+Mb) of mutual inductances Ma and Mb;
where Ma is the mutual inductance between the transmitting coil and a first receiving coil, where Mb is the mutual inductance between the transmitting coil and a second receiving coil, andsaid means of calculation comprises;
(i) a multiplier-adder for adding the difference Va−
Vb in the voltages generated by the receiving coils with a feedback signal, multiplied by sum Va+Vb of the voltages generated by the receiving coils, (ii) a demodulator for demodulating the signal emitted by said multiplier, and (iii) an integrator for generating the continuous radial voltage Vr using the signal emitted by the demodulator, where said feedback signal is the continuous radial voltage Vr;
where the relative displacement is the function of the value of the continuous radial voltage Vr for which the output of said multiplier is null.
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Specification