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WO2010052664A2 - Modulation de signaux d'entrée pour un appareil de détection - Google Patents

Modulation de signaux d'entrée pour un appareil de détection Download PDF

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Publication number
WO2010052664A2
WO2010052664A2 PCT/IB2009/054920 IB2009054920W WO2010052664A2 WO 2010052664 A2 WO2010052664 A2 WO 2010052664A2 IB 2009054920 W IB2009054920 W IB 2009054920W WO 2010052664 A2 WO2010052664 A2 WO 2010052664A2
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WO
WIPO (PCT)
Prior art keywords
signal
sensor
periodic
shifted
sensor apparatus
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Application number
PCT/IB2009/054920
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English (en)
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WO2010052664A3 (fr
Inventor
Marcus Prochaska
Boris Klabunde
Stefan Butzmann
Original Assignee
Nxp B.V.
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.)
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Publication date
Application filed by Nxp B.V. filed Critical Nxp B.V.
Priority to EP09759808A priority Critical patent/EP2353020A2/fr
Priority to CN2009801443199A priority patent/CN102216796A/zh
Publication of WO2010052664A2 publication Critical patent/WO2010052664A2/fr
Publication of WO2010052664A3 publication Critical patent/WO2010052664A3/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
    • G01R33/063—Magneto-impedance sensors; Nanocristallin sensors

Definitions

  • the present invention relates to a sensor apparatus for generating a sensor signal based on an input signal and to a method for measuring a physical characteristic of an input signal.
  • the present invention relates to an aniso tropic-magneto -resistive sensor and to a method for measuring a magnetic field with an aniso tropic-magneto -resistive sensor.
  • Measurement engineering is a field in electronic engineering that deals with processes for determining magnitudes of specified physical characteristics of an object. This may be for example the magnitude of a magnetic field of an electromagnet or the length of a geometric object. Such kind of processes are commonly called measurements and the technical apparatuses for performing a measurement are called sensor apparatuses.
  • the sensor apparatus measuring the magnitude of the interested physical characteristic outputs an electronic signal that is directly interpretable and allows a direct conclusion to the measured magnitude. For that reason, the measured magnitude and the magnitude of the electronic output signal should be mathematically proportional to each other. This is called linearity condition, which should be given over a wide range of magnitudes of the interested physical characteristic. In case of measuring a magnetic field, the sensor apparatus should double the magnitude of its output signal if the magnitude of the magnetic field to be measured doubles.
  • the requirements to sensor apparatuses are further defined by its application field. Since a sensor apparatus does not effect any mechanical effort, like the rotation in an engine or the heating in a melting furnace, its physical presence is usually unintended since the sensor apparatus consumes precious space. Thus, sensor apparatuses must be constructed as small as possible to not constrain the intended technical effect of a machine. Further, in the application field, a sensor apparatus is exposed a lot of outer physical influences that have an effect on the measurement, reduce the quality of the output signal and complicate its interpretation.
  • Magnetic field sensors take up an important place in the fields of measurement engineering, since they allow a contact-free measurement and are insensitive against acoustic noise and fouling.
  • Magnetic field sensors may be divided into inductive sensors generating a voltage based on a magnetic field, field-plate sensors having a variable resistance based on a magnetic field and Wiegand- sensors changing its magnetic orientation based on magnetic fields.
  • An example for inductive sensors may be a Hall sensor, which generates a voltage by deflecting the current in a current-carrying conductor based on a magnetic field.
  • field-plate sensors are very widespread in the fields of measurement engineering. They are used as rotational speed and rotational angle sensors, as switches, as contact-free controlled resistors and for potential free measuring of direct currents.
  • field-plate sensors have a quadratic characteristic. That is, if the magnetic field, to which the field-plate sensor is exposed, will be doubled, the resistance of the field plate sensor will be reduced to a fourth.
  • the bias point of field-plate sensors is situated in the peak of its characteristics. This reduces the sensitivity for small magnetic fields, since a field-plate sensor would not generate a detectable elongation around its peak.
  • Various solutions have been proposed to the sensitivity of field-plate sensors.
  • the bias point will is artificially moved outside the peak by applying an offset. Although the sensitivity is increased, the offset must be cancelled out from the output signal. This offset cancellation requires complex and costly cancellation algorithms limiting the overall performance of the field-plate sensor. Further, due to lifetime and temperature drifts, the offset is not constant and has therefore a strong effect on the measurement quality of the sensor apparatus.
  • the characteristic of the field-plate sensor itself is changed by adding further mechanical features to the field-plate sensor.
  • Such mechanical features may be e.g. so called Barber poles.
  • sensor apparatuses must be sensitive, small sized and resistant against outer physical influences. As can be seen from the example of magnetic field-plate sensors, these conditions can not be achieved together. If by regulating one of these condition with technical means, another condition will be downgraded.
  • the basic idea of the invention is to benefit from carrier signals known from the fields of communication engineering.
  • it is proposed to modulate the magnitude of the physical characteristic to be measured, hereinafter called input signal, onto a periodic signal operating as the carrier signal.
  • an information signal is modulated onto a carrier signal adapt the signal to be transmitted to the physical characteristics of the transmission channel.
  • the invention is based on the thought to regard the sensor apparatus as a transmission channel.
  • the input signal can be adapted to the physical characteristics of the sensor apparatus.
  • the present invention proposes a sensor apparatus for generating a sensor signal based on an input signal.
  • the sensor apparatus includes a signal generation device and a sensor device.
  • the signal generation device outputs a periodic signal, which is of the same type as the input signal. That is, if e.g. the input signal is a magnetic field, the periodic signal is also a magnetic field. Further, the signal generation device mixes the input signal and the periodic signal and generates a mixed signal.
  • the sensor device now detects the mixed and generates a detection signal based on its internal characteristic. This detection signal can be directly interpreted with the same techniques as used in the fields of communication engineering, e.g. by demodulation.
  • the signal generation device is a small technical element, increases the complexity of the sensor apparatus hardly noticeably and increases the sensor apparatus technically small.
  • the input signal can be adapted to the internal characteristic of the sensor apparatus and in detail to the internal characteristics of the sensor device. On the one hand, this allows to move the detection of the input signal to a part of the characteristic curve of the sensor apparatus, in which the characteristic curve is not only linear but also very steep. In other words, by modulating the input signal, the sensitivity of the sensor apparatus can be increased. On the other hand, it also allows to reduce noise, since the modulation transforms the input signal into a spectral part, in which influences by noise are minimal. Summarized, the present invention provides a small, sensitive and robust sensor apparatus.
  • the present invention may be especially suitably applied in the fields of magnetic field sensors.
  • field-plate sensors and especially anisotropic-magneto- resistive sensors have a quadratic characteristic curve
  • the present invention may especially effectively increase their sensitivity by synchronously decreasing their required space and increasing their robustness.
  • the best way to perform the mixing of the input signal and the periodic signal is to modulate the input signal onto the periodic signal by superposition. This enables an easy and convenient spectral treatment of the detection signal and thus facilitates the spectral interpretation of the detection signal. Further, a superposition of the input signal and the periodic signal can be realized without further technical means and is therefore simple.
  • the present invention can be implemented as system-on-chip and is therefore excellently appropriated to provide small sized sensor apparatuses for e.g. an implementation as rotational speed sensors in modern technical applications.
  • the signal generator may also generate a timely shifted periodic signal, wherein the input signal is also modulated onto the shifted periodic signal to generate a shifted mixed signal. Consequently the sensor device not only generates the detection signal but also a shifted detection signal.
  • the time shift between the periodic signal and the shifted periodic signal is 180°. By that means, both generated periodic signals have the same shape but different signs. Thus, both signals can be verified in a especially convenient way.
  • the sensor device my include two different sensor heads.
  • the first sensor head is used for generating the detection signal based on the mixed signal and the second sensor head is used for generating the shifted detection signal. This allows to generate both detection signals with a minimum of loss of information.
  • the first realization works best, if the first sensor head and the second sensor head have the same physical characteristics and are arranged engaged to each other in a common layer. This would not only reduce the required space for that realization onto a minimum due to the arrangement in a common layer but also allows an effective error detection, since both sensor heads are comparably equal.
  • both detection signals may be generated by multiplexing.
  • a switching device would alternatively allow the sensor device to generate the detection signal based on the mixed signal and to the generate the shifted detection signal based on the shifted mixed signal.
  • the discontinuities in the resulting detection signals may be continued based on common mathematical methods. Since the second realization requires only one sensor head, the required space for the sensor apparatus can be further reduced.
  • it can be omitted to shift the periodic signal for generating two different periodic signals. This can be achieved by sampling the detection signal. Therein, a first sampling unit samples the detection signal at first sampling points in time and a second sampling unit samples the detection signal at second sampling points in time. Therein, the first and second sampling points are different to each other. Since there is no need to generate two different periodic signals and also no need to generate two different mixing signals, the present embodiment can further reduce the required space for the present invention.
  • a summing unit may sum the both signals. This method is especially effective, if the shift between both signals is 180°. This would erasure at least some spectral components in the detection signals, which occur due to the modulation of the input signal with the periodic signal.
  • the summing unit may facilitate the following interpretation of the detection signals and decrease the complexity of the sensor apparatus.
  • the above described erasure effect is especially effective by a time delay of 180°. However, the erasure effect can also be regarded at time delays higher or lower than 180°.
  • a demodulation unit may be used to remove at least some parts of the periodic signal.
  • Such a demodulation unit may be simply realized by a multiplier multiplying the periodic signal itself onto the detection signal or the summed detection signals.
  • a comparator unit may be applied to verify the detection signal or the summed detection signals against a threshold.
  • the comparator device may be a Schmitt-Trigger.
  • the present invention also proposes a method for determining a magnitude of a physical characteristic of an input signal.
  • a periodic signal is generated, which is of the same type as the input signal.
  • the periodic signal and the input signal are mixed, preferably by superposition.
  • a detection signal is generated based on the input signal and a characteristic curve e.g. of a sensor device.
  • the method has the same advantages and technical effects as the above described sensor apparatus. Further, the above described additional apparatus features may all be introduced as method features in the forgoing method.
  • Fig. 1 shows a characteristic curve of a AMR-sensor
  • Fig. 2 shows a sensor apparatus according to a first embodiment of the present invention
  • FIG. 3 shows a diagram discussing the spectral components of a detection signal
  • Fig. 4 shows a sensor apparatus according to a second embodiment of the present invention
  • Fig. 5 shows sensor heads for the sensor apparatus according to the second embodiment
  • Fig. 6 shows a sensor apparatus according to a third embodiment of the present invention.
  • Fig. 7 shows a sensor apparatus according to a fourth embodiment of the present invention
  • Fig. 8 shows a diagram explaining the sampling principle of the sensor apparatus according to a fourth embodiment of the present invention.
  • Fig. 9 shows a diagram explaining the generation of an interpretable sensor signal based on an input signal and a periodic signal.
  • an anisotropic magneto-resistive sensor should be exemplary regarded.
  • An AMR-sensor is a field plate sensor that changes its electric resistance R based on an applied magnetic field H.
  • the input signal of an AMR-sensor is a magnetic field H and the output signal is a current or a voltage, which changes depending on the resistance R of the AMR-sensor.
  • an AMR sensor can be described by its characteristic curve 110 informing about the capability of an electronic element to change its output signal dependent on an applied input signal.
  • the AMR-sensor has a negative parabola as characteristic curve 110. In other words, the AMR-sensor changes its resistance R based on an applied magnetic field H in a quadratic way.
  • the AMR-sensor has further a bias point 130 informing about the output signal of an electronic device, if no input signal is applied.
  • the bias point 130 of the AMR-sensor indicates its resistance R if no magnetic field H is applied and is located in the maximum of the characteristic curve 110.
  • an alternating magnetic field 120 should be applied. This alternating magnetic field 120 has the shape of a sinus curve shown in a time-magnetic field-diagram below the characteristic curve 110 of fig. 1. After applying the alternating magnetic field 120, the resistance R of the AMR-sensor will periodically move along the characteristic curve 110. In fig.
  • a certain elongation point 140 is shown, which indicates the resistance R(to) under a magnetic field H(to) which occurs to a specific point in time to.
  • the magnetic field H(to) of the elongation point 140 does not fit to any elongation of the sinus curve of the alternating magnetic field 120. Based on the characteristic curve 120, some disadvantages of conventional AMR-sensors will become obvious complicating their technical implementation.
  • the AMR-sensor is subjected to outer influences moving the bias point 130 outward from the maximum of the characteristic curve 110, the characteristic of the
  • AMR-sensor will change depending on the direction of the movement. However, since this direction is usually undefined, it is undefined whether the AMR-sensor has a positive characteristic (wherein the resistance R of the AMR-sensor increases based on an increase in the applied magnetic field H) or a negative characteristic (wherein the resistance R of the AMR-sensor decreases based on an increase in the applied magnetic field H). This undefined condition complicates the analysis and interpretation of the measurement results of the AMR- sensor.
  • an offset usually not only involves temperature and lifetime drifts but also complicates the amplification of the output signal of the AMR-sensor for the post processing. Thus, an offset is usually cancelled out by complex and costly offset cancellation algorithms.
  • FIG. 2 shows a measurement arrangement 200 for measuring a magnetic field H m using an AMR-sensor 220, 230 according to the present invention.
  • the measurement arrangement 200 includes a magnetic source 210, a signal generation device being a magnetic field generator 220 and a sensor device being an AMR-sensor- head 230.
  • the magnetic source 210 excites a magnetic measurement field H m to be measured by the AMR-sensor 220, 230.
  • the magnetic field generator 220 excites a periodic signal of the same type as the signal to be measured.
  • the excited periodic signal is a periodic magnetic field H e .
  • the magnetic measurement field H m and the periodic magnetic field H e are both directed against the AMR-sensor-head 230. This effects, that both magnetic fields H m , H e are summed together prior impinging on the sensor-head 230. In other words, by summing both magnetic fields H m , H e , the magnetic measurement field H m will be modulated onto the periodic magnetic field H e .
  • the magnetic field generator 220 may consist of a current source 222 and an excitation coil 223.
  • the current source 222 outputs a periodic excitation current I e and supplies it to the excitation coil 223.
  • the AMR-sensor head 230 consists of an AMR-sensor element 232 and a constant current source 231.
  • the constant current source 231 drives a constant current I a through the AMR-sensor element 232.
  • This effects a measurement voltage U a at the AMR- sensor element 232, wherein the magnitude of the measurement voltage U a depend on the resistance R of the AMR-sensor element 232. Since this resistance R is influenced by the sum of the magnetic measurement field H m and the periodic magnetic field H e , the resistance R and therefore the measurement voltage U a directly includes an information about the magnitude of the sum of the magnetic measurement field H m and the periodic magnetic field H e .
  • the magnetic measurement field H m can be directly calculated based on the resulting measurement voltage U a .
  • the magnetic measurement field H m may be described by:
  • H m (t) H m sm( ⁇ J) (1) and the periodic magnetic field H e can be described by:
  • H e (t) H e s ⁇ n( ⁇ J) (2).
  • ⁇ m and ⁇ e specifies the circular frequency.
  • the characteristic curve 110 of the AMR-sensor element 232 can be described by:
  • Ro is the resistance R of the AMR-sensor element 232 in the maximum of the characteristic curve 110.
  • Ho is the demagnetizing and anisotropic field. Both parameters are system specific.
  • spectral components of the resistance R of the AMR-sensor element 232 are schematically shown in a spectral diagram in fig. 3.
  • the components (4.3)-(4.5) together represents an amplitude modulation.
  • the components representing the amplitude modulation are surrounded by a box 300 in fig. 3.
  • an amplitude modulation can be demodulated by simply multiplying the amplitude modulated signal with its carrier frequency.
  • the constant component of the resistance R does not include any information about the circular frequency. It is left to the discretion of the skilled person how he would derive the magnetic measurement field H m from the measured resistance R.
  • Fig. 4 shows an AMR-sensor 400 according to a second embodiment of the present invention.
  • the basic idea behind the second embodiment is to provide two different AMR-sensor heads.
  • the first AMR-sensor head detects the magnetic measurement field H m superposed with the periodic magnetic field H e described above.
  • the second AMR-sensor head detects the magnetic measurement field H m superposed with a second periodic magnetic field, which has the same shape as the first periodic magnetic field H e , but is shifted by 180° in time.
  • the second periodic magnetic field should be named shifted magnetic field H e , in v
  • the presence of the magnetic measurement field H m should be implicitly assumed. However, it would not be explicitly mentioned in the following description. Alternatively, it could also be assumed, that the magnetic measurement field H m is zero and can therefore be omitted in the following description.
  • the AMR-sensor 400 includes a current source 440, a delay element 410, two different excitation coils 420, 450, two different AMR-sensor heads 430, 460, a summing unit 470, a multiplier 480 and a Schmitt-Trigger 490.
  • the current source 440 outputs an alternating excitation current i e , which is directly provided to the second excitation coil 450.
  • the excitation current i e is further provided to the delay element 410 delaying the excitation current i e by 180° in time.
  • the delayed excitation current i e in v is then provided to the first excitation coil 420.
  • the first excitation coil 420 generates the shifted periodic magnetic field H e , in v based on the shifted excitation current i e , in y Synchronously, the second excitation coil 450 generates the periodic magnetic field H e based on the excitation current i e .
  • the first and second AMR-sensor heads 430, 460 respectively detect the shifted periodic magnetic field H e , in v and the periodic magnetic field H e and respectively output a shifted detection voltage U s , inv and a detection voltage U 8 .
  • These detection voltages U s , inv , U s , inv correspond to the measurement voltage U a shown in fig. 2.
  • the detection voltage U 8 correspond to the measurement voltage U a
  • the shifted detection voltage U s , inv correspond to a shifted measurement voltage U a , inv .
  • H e (t) -H e SiR(COJ) (5).
  • the shifted periodic magnetic field H e in v generates a shifted resistance R inv at the first AMR-sensor head 430, which can be calculated in the same way as shown in equations (l)-(4).
  • the shifted resistance R inv should not be calculated in detail. As already explained in fig.
  • the summed resistance R g and consequently the summed voltage U g represents an amplitude modulation out of a voltage corresponding to the magnetic measurement field H m and a voltage corresponding to the periodic magnetic field H e . That is, the summed voltage Ug can be demodulated my a multiplication with a voltage corresponding to the periodic magnetic field H e or corresponding to the excitation current i e .
  • the summed voltage U g is fed to the multiplier 480 multiplying it with a voltage derived from the excitation current i e .
  • the result is a demodulated voltage Ud including all information about the magnetic measurement field H m and can therefore be used as output signal U ou t of the AMR-sensor 400.
  • the magnetic measurement field H m is a periodic signal, it is suitable to further process the summed voltage U g e.g. by a comparator. This would increase the readability of the output signal U ou t of the AMR-sensor 400.
  • a periodic magnetic measurement field H m is given e.g. in rotational speed sensors in automotive applications.
  • a Schmitt- Trigger 490 should be used as comparator. Since the construction and the operation of the Schmitt-Trigger 490 is well known for a skilled person, a detailed discussion can be omitted.
  • the AMR-sensor heads 430, 460 according to the first embodiment are indicated in fig. 5. Therein, both AMR-sensor heads 430, 460 are arranged in a common layer. Further, both sensor heads 430, 460 are constructed as meanders and engaged into each other. Both sensor heads 430, 460 are also constructed by alternatively linking a metal element 530 and a Permalloy element 540.
  • the material of the metal element 530 may aluminium (Al).
  • the material of the Permalloy element 530 may be a nickel- iron- alloy (NiFe).
  • Fig. 6 shows an AMR-sensor 600 according to a third embodiment of the invention.
  • This embodiment differs from the AMR-sensor 400 according to the second embodiment only in its construction of the AMR-sensor heads.
  • the AMR-sensor 600 only includes the first AMR-sensor head 430 receiving the periodic magnetic field H e and the shifted periodic magnetic field H e , in v from a multiplexer 610, multiplexing the shifted periodic magnetic field H e , in v excited from the first excitation coil 420 and the periodic magnetic field H e excited from the second excitation coil 450.
  • the advantage of using only one AMR-sensor head 430 is not only that the characteristic curve 110 of the AMR-sensor head 430 is exactly equal for the periodic magnetic field H e and the shifted periodic magnetic field H e , in v when generating the detection voltages U s , U s , inv , it is also possible to save the space required for the implementation of the second AMR-sensor head 460.
  • Figs. 7-9 show an AMR-sensor 700 according to a fourth embodiment of the present invention.
  • only one excitation coil 420 excited by the current source 420 is used to generate a periodic magnetic field H e for modulating the magnetic measurement field H m .
  • one single AMR-sensor head 430 is exposed to the sum of the periodic magnetic field H e and the magnetic measurement field H m and generates a measurement voltage U a .
  • This measurement voltage U a is sampled by two different sampling units 710, 720 at different sampling points in time 810, 820.
  • the sampled voltage of the first sampling unit 710 represents the shifted detection voltage U 8 , inv .
  • the sampled voltage of the second sampling unit 720 represents the detection voltage U 8 .
  • Both detection voltages U 8 , U 8 , inv are summed together by the summing unit 470 outputting a summed voltage Ug representing the demodulated voltage Ud from the second and third embodiment. Also this summed voltage U g can optionally be further processed by the Schmitt-Trigger 490 to further increase the readability of the output signal U ou t and to remove noise.
  • the sampling points 810 for the first sampling unit 710 are derived from the local minima 830 of the periodic magnetic field H e . Accordingly, the sampling points 810 for the second sampling unit 720 are derived from the local maxima 840 of the periodic magnetic field H e . Since the periodic magnetic field H e is linearily excited based on the excitation current i e , the local maxima 840 and minima 830 can also be taken from the excitation current i e . The result of the sampling operation in both sampling units 710, 720 are two timely shifted detection voltages U s ,U s , inv .
  • the periodic magnetic field H e is sampled respectively in its maxima 840 and minima 830, the frequency of the periodic magnetic field H e is removed from the shifted detection voltages U s ,U s , inv .
  • the summing operation of the timely shifted detection voltages U s ,U s , inv in the summing unit 470 directly leads to a demodulated summed voltage.
  • the summed voltage U g outputted by the summing unit 470 directly corresponds to the demodulated voltage Ud of the second and third embodiment.
  • this summed voltage may be optionally processed by the Schmitt-Trigger 490.
  • Fig. 9 shows diagrams explaining the generation of the output voltage U ou t based on the magnetic measurement field H m .
  • the magnetic measurement field H m is superposed with the periodic magnetic field H e .
  • the measurement voltage U a is generated, which will be sampled twice.
  • the first sampling operation leads to the detection voltage U 8 and the second sampling operation leads to the shifted detection voltage U s , inv .
  • Both detection voltages U 8 U s , inv are summed together resulting into the summed voltage U g .
  • This summed voltage U g is finally post-processed by the Schmitt-Trigger 490 generating the output voltage U ou t-
  • the multiplexer 610 of the second embodiment is also able to realize the first and second sampling units 710, 720.
  • the switch of the multiplexer 610 conducts the measurement voltage Ua in the minima 830 of the excitation current i e to generate the shifted detection voltage U s , inv and in the maxima 840 of the excitation current ⁇ to generate the detection voltage U 8 .
  • the present invention proposes to modulate a physical signal to be detected by a sensor apparatus onto a periodical physical signal of the same type as the physical signal to be detected. This increased the sensitivity and the robustness of the sensor apparatus and decreases its complexity.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Nanotechnology (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Magnetic Variables (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

La présente invention concerne un appareil de détection (200) destiné à générer un signal de mesure (Ua) sur la base d'un signal d'entrée (Hm). Le signal d'entrée est de préférence un champ magnétique. L'appareil de détection comprend un dispositif de génération de signal (220) et un dispositif de détection (230). Le dispositif de génération de signal (220) génère un signal périodique (He) du même type que le signal d'entrée (Hm). Le dispositif de génération de signal génère en outre un signal mixte sur la base du signal d'entrée (Hm) et du signal périodique (He). Le dispositif de détection (230) génère enfin le signal de mesure (Ua) sur la base du signal mixte et d'une courbe caractéristique (110) du dispositif de détection (230). En mélangeant le signal d'entrée (Hm) à un signal périodique (He) du même type, la sensibilité et la robustesse de l'appareil de détection (200) peuvent être augmentées par la réduction de manière synchrone de sa complexité.
PCT/IB2009/054920 2008-11-06 2009-11-05 Modulation de signaux d'entrée pour un appareil de détection WO2010052664A2 (fr)

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Application Number Priority Date Filing Date Title
EP09759808A EP2353020A2 (fr) 2008-11-06 2009-11-05 Modulation de signaux d'entrée pour un appareil de détection
CN2009801443199A CN102216796A (zh) 2008-11-06 2009-11-05 对传感器设备的输入信号的调制

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EP08105742.4 2008-11-06

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8680857B2 (en) 2010-07-30 2014-03-25 Nxp B.V. Magnetoresistive sensor
CN105629184A (zh) * 2014-11-20 2016-06-01 苹果公司 电子设备和用于电子设备的混合磁力计传感器套件
JP2019124661A (ja) * 2018-01-19 2019-07-25 株式会社アドバンテスト 測定装置、方法、プログラム、記録媒体

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4703378A (en) * 1984-03-01 1987-10-27 Sony Corporation Magnetic transducer head utilizing magnetoresistance effect
EP0743508A2 (fr) * 1995-05-16 1996-11-20 Mitutoyo Corporation Capteur de position employant un courant d'induction

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8680857B2 (en) 2010-07-30 2014-03-25 Nxp B.V. Magnetoresistive sensor
CN105629184A (zh) * 2014-11-20 2016-06-01 苹果公司 电子设备和用于电子设备的混合磁力计传感器套件
US10094888B2 (en) 2014-11-20 2018-10-09 Apple Inc. Low-power magnetometer assemblies with high offset stability
JP2019124661A (ja) * 2018-01-19 2019-07-25 株式会社アドバンテスト 測定装置、方法、プログラム、記録媒体
JP7061882B2 (ja) 2018-01-19 2022-05-02 株式会社アドバンテスト 測定装置、方法、プログラム、記録媒体

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CN102216796A (zh) 2011-10-12
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