FI127728B

FI127728B - Sensor system and measurement method

Info

Publication number: FI127728B
Application number: FI20165830A
Authority: FI
Inventors: Joonas Hollo; Heikki Korhonen; Lauri Uusivirta; Matti T Mäkelä
Original assignee: Valmet Automation Oy
Priority date: 2016-11-07
Filing date: 2016-11-07
Publication date: 2019-01-15
Also published as: CN108061562B; SE541473C2; SE1751313A1; CN108061562A; FI20165830A; FI20165830L

Abstract

A sensor system for a blade transmitter measures flowing material, and comprises a signal processing unit (152), and magnets (200 to 214) in a successive order. A bridge sensor (216) has two anisotropic magnetoimpedance bridges (218, 220). The magnets (200 to 214) are located adjacent to and matched with the bridges (218, 220) for providing a magnetic field to the bridges (218, 220). The magnets (200 to 214) and the bridges (218, 220) move with respect to each other in a direction of the successive magnets (200 to 214) in response to movement of the blade structure (120) subjected to force of the flowing material (108). The bridges (218, 220) output signal values as a function of the movement. The signal processing unit (152) forms a property value related to the flowing material (108) on a basis of a ratio of the signal values provided by the bridges (218, 220).

Description

The invention relates to a sensor system and a measurement method 5 for a blade transmitter.

Background

A blade-type consistency transmitter has to be temperature calibrated using laboratory measurements because the current blade-type consistency 10 transmitters have a non-linear response and thermal noise dependence. Additionally, the sensor in the blade-type consistency transmitter requires overload protections. Hence, there is a need to improve the blade-type consistency transmitter.

Brief description

The present invention seeks to provide an improvement in the consistency, viscosity or density measurement with a blade transmitter. According to an aspect of the present invention, there is provided a sensor system as specified in claim 1.

According to another aspect of the present invention, there is provided measurement method in claim 8.

The invention has advantages. The temperature dependence of the measurement can be eliminated at least partly.

List of drawings

Example embodiments of the present invention are described below, by way of example only, with reference to the accompanying drawings, in which

Figure 1A illustrates an example a blade-type consistency transmitter;

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Figure IB illustrates an example a blade-type consistency transmitter with different location of the supporting axis;

Figure 2 illustrates an example of a sensor system;

Figure 3 illustrates an example of deviation between signal waveforms output by the bridges;

Figure 4 illustrates an example of conversion of the output analog signals into digital form;

Figure 5 illustrates an example of a bridge circuitry;

Figure 6 illustrates an example of the sensor system with a reaction element;

Figure 7 illustrates an example of the sensor system with the reaction element under influence of force;

Figure 8 illustrates an example of a signal processing unit with at least one processor and at least one memory; and

Figure 9 illustrates of an example of a flow chart of a measuring method.

Description of embodiments

The following embodiments are only examples. Although the specification may refer to “an” embodiment in several locations, this does not necessarily mean that each such reference is to the same embodiment(s), or that the feature only applies to a single embodiment. Single features of different embodiments may also be combined to provide other embodiments. Furthermore, words comprising and including should be understood as not limiting the described embodiments to consist of only those features that have been mentioned and such embodiments may contain also features/structures that have not been specifically mentioned.

It should be noted that while Figures illustrate various embodiments, they are simplified diagrams that only show some structures and/or functional 30 entities. The connections shown in the Figures may refer to logical or physical connections. It is apparent to a person skilled in the art that the described

20165830 prh 18-12-2018 apparatus may also comprise other functions and structures than those described in Figures and text. It should be appreciated that details of some functions, structures, and the signalling used for measurement and/or controlling are irrelevant to the actual invention. Therefore, they need not be discussed in more 5 detail here.

Figure 1A illustrates an example of a blade-type consistency transmitter which may also be called a viscometer or a blade transmitter. The name of viscometer 100 is used for measuring consistency or viscosity of flowing material 108. The viscometer 100 may also be called a rheometer. The flowing 10 matter 108 has a low resistance to change its shape and high resistance to change of its size/volume which enables the flowing matter to flow like liquid. That is, flowing matter can easily be reshaped without changing its density. The flowing material 108 may be suspension, which may, in turn, be pulp slurry or the like, for example. Alternatively, the flowing material 108 may be sewage, liquid of 15 petrochemical process or liquid of mineral process.

The blade transmitter 100 comprises a measuring arm 102 which extends through a process pipe 114. The measuring arm 102 may be made of metal such as steel, for example.

A first end 104 of the measuring arm 102 of the blade transmitter 100 20 is coupled with a projection 106, and the projection 106 is insertable in the suspension 108 flowing or residing in the process pipe 114. The projection 106 may also be called a blade. The projection 106 and the flowing material 108 interact through shear forces because the flowing material 108 and the projection 106 move with respect to each other. The flowing material 108 may flow in the 25 process pipe 114 while the projection 106 is stationary, or the measurement arm 102 may move the projection 106 in the flowing material 108.

A longitudinal axis of the projection 106 (marked with dashed line in Figure 1A) may be directed parallel to the direction of the flow (marked with a straight arrow in Figure 1A) in the process pipe 114. The force caused by the 30 flowing matter 108 may move the projection 106. The movement may tilt of the measurement arm 102 such that the measurement arm 102 rotates a little with

20165830 prh 18-12-2018 respect to the supporting axis 110 (rotation/tilt is shown with curved arrowheaded lines in Figure 1A). The supporting axis 110 may also be above the sensor system 150 such that the sensor system 150 is between the process pipe 114 and the supporting axis 110 (see Figure IB). The tilt, which is related to the consistency of the flowing matter, may then be measured by a sensor system 150 because the arm 102 may move towards the opposite or the same direction of the flow. The velocity of the flow may also be measured in a separate measurement, and it may also be utilized or even required in the determination of consistency or viscosity. The sensor system 150 then outputs a signal carrying information about 10 the measurement of the tilt and the signal is then received by a signal processing unit 152. The signal processing unit 152 may be a part of or operationally coupled with the blade transmitter 100. The signal processing unit 152 may be a part of or operationally coupled with sensor system 150.

Figure IB is similar to Figure 1A and illustrates an example where the 15 supporting axis 110 may be above the sensor system 150 such that the sensor system 150 is between the process pipe 114 and the supporting axis 110.

Figure 2 illustrates an example of a sensor system 150 for the blade transmitter. The sensor system 150 comprises magnets 200, 202, 204, 206, 208, 210, 212, 214 which may be packed in a single component. In an embodiment, the 20 magnets 200 to 214 may be in a form of a sequence such that the sequence of the magnets forms a rod or a strip. The magnets 200 to 214 are in a successive order. In an embodiment, a curve through the poles of the magnets 200 to 214 is a straight line. In an embodiment, an order of the poles of the magnets 200 to 214 may be the same. In an embodiment, at least one magnet may have an opposite 25 order of the poles to that of the other magnets 200 to 214. The magnetic field lines are shown with curved lines starting and ending in magnetic poles N and P of the magnets 200 to 214.

The sensor system 150 comprises a bridge sensor 216 with a pair of anisotropic magnetoimpedance bridges 218, 220. A bridge is an electric circuit 30 which is, per se, known to a person skilled in the art and which is used for measuring accurately an electric quantity such as impedance. In general, the

20165830 prh 18-12-2018 bridge sensor 216 may have more than two anisotropic magnetoimpedance bridges but the measurement operation is based on at least one pair of anisotropic magnetoimpedance bridges. The bridge sensor 216 may be a linear position sensor. The linear position sensor may be KMXP1000, for example. The 5 magnets 200 to 214 and the bridges 218, 220 are adjacent to each other and they are arranged to move with respect to each other. In an embodiment, the magnets 200 to 214 and the bridges 218, 220 have a short distance therebetween and thus they are directly adjacent to each other. The proximity allows a magnetic field of the magnets 200 to 214 to effectively reach the bridges 218, 220 and have effect 10 on their output signal.

A first bridge 218 of the pair of the bridges may have four magnetoimpedance components 250, 252, 254, 256, and a second bridge 220 of the pair of the bridges may have also four magnetoimpedance components 258, 260, 262, 264. In each of the bridges 218, 220, at least one of the 15 magnetoimpedance components 250 to 256 and 258 to 264 is actually required to be such that its impedance depends on a magnetic field. The magnetoimpedance may refer to magnetocapacitance, where capacitance of an electric component depends on strength and a direction of a magnetic field, or to magnetoresistance, where resistance of an electric component depends on 20 strength and a direction of a magnetic field. In more details, anisotropic magnetoimpedance refers to a dependence of electrical impedance on an angle between a direction of electric current through a magnetoimpedance component and a direction of magnetization associated with the magnetoimpedance component. The magnetoimpedance components 250 to 264 are electrically 25 connected together with an electric circuit 222 of two bridge couplings.

The bridges 218, 220 have a magnetic orientation deviation therebetween. The deviation of the magnetic orientation between the bridges 218, 220 may be based on a rotation of the bridges 218, 220 with respect to each other, the rotation being within ]0, π/2[ (range from 0 to π/2 not including limits) 30 and the bridges 218, 220 being otherwise at least approximately similar. The rotation of the bridges 218, 220 with respect to each other results in a non-zero

20165830 prh 18-12-2018 angle of the magnetic orientation between any of the magnetoimpedance components 250, 252, 254, 256 of the first bridge 218 and any of the magnetoimpedance components 258, 260, 262, 264 of the second bridge 220.

In an embodiment, the deviation of the magnetic orientation between 5 the bridges 218, 220 maybe at least approximately π/4.

In an embodiment, the magnetic orientation of the first bridge 218 may be based on horizontal and vertical directions of the orientation of the magnetoimpedance components 250, 252, 254, 256 (shown with horizontal and vertical lines within magnetoimpedance components in Figure 2), and the 10 magnetic orientation of the second bridge 220 may be based on inclined directions of the orientation of the magnetoimpedance components 258, 260, 262, 264 (shown with inclined lines within magnetoimpedance components in Figure 2). Here, the longitudinal axis of the magnets 200 to 214 may be considered horizontal. Such an arrangement of the magnetoimpedance 15 components 250 to 264 enables the realization of the deviation π/4 between the magnetic orientations of the bridges 218, 220, for example.

In an embodiment, the magnetic orientation deviation between any two magnetoimpedance components 250 to 264 from different bridges 218, 220 may be constant. In an embodiment, the magnetic orientation deviation between 20 two magnetoimpedance components 250 to 264 from different bridges 218, 220 may vary on the basis of magnetoimpedance components 250 to 264. However, the bridges 218, 220 may have an average magnetic orientation deviation therebetween. The deviation of the magnetic orientation between the bridges 218, 220 may be understood as a phase shift of a relative rotation of physical 25 objects.

The magnetic orientation deviation causes a corresponding deviation between signal waveforms output by the bridges 218, 220 an example of which is illustrated in Figure 3. The y-axis denotes amplitude A, and the x-axis denotes an angle oc, both of the axes in arbitrary scale. The angle may be based on a ratio of 30 distances between two successive magnets 200 to 214 and two successive magnetoimpedance components 250 to 264. A constant or determined

20165830 prh 18-12-2018 orientation deviation between the bridges 218, 220 results in a constant or determined shift between the signal waveform 300 of the first bridge 218 and the signal waveform 302 of the second bridge 220. The deviation between the signal waveforms may be understood as a phase shift Θ of signals. In an embodiment, the angle Θ may range from zero to half of pi ([0, π/2]) in the measurement. In an embodiment, the range of angle ocm which is used in the measurement may be [π/2, π/2]. In an embodiment, the range of angle ocm which is used in the measurement may be [0, π]. In an embodiment, the range of angle ocm which is used in the measurement may be [-π, π]. However, the range ocm is not limited to these. It is also possible to use a wider range than one cycle if the periods of the periodical signals are counted.

The magnets 200 to 214 are located adjacent to the bridges 218, 220. The adjacency may mean that the magnets 200 to 214 are located directly adjacent to the bridges 218, 220. The magnets 200 to 214 are matched with the bridges 218, 220 for providing a magnetic field to the bridges 218, 220. That is, the physical location and size of each of the magnets 200 to 214 has a determined relation with respect to the magnetoimpedance components 250 to 264, and vice versa.

The magnets 200 to 214 or the bridges 218, 220 are located in contact with the measuring arm 102. In this manner, the measuring arm 102 may cause force to the sensor system 150, and the force moves the magnets 200 to 214 and the bridges 218, 220 with respect to each other in a direction of the successive magnets 200 to 214 in response to movement of the blade structure 120 subjected to force of the flowing material 108. An example of the blade structure 120, which comprises the measurement arm 102 and the projection 106, is illustrated in Figures 1A and IB.

The magnets 200 to 214 and the bridges 218, 220 move with respect to each other in a direction of the successive magnets 200 to 214 in response to movement of the blade structure 120 subjected to force of the flowing material 108. The bridges 218, 220 then output signal values as a function of the movement. That is, a displacement of the magnets 200 to 214 and the bridges

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218, 220 correspond to a first signal value output by the first bridge 218 and a second signal value output by the second bridge 220. The bridges 218, 220 output the signal values as a function of the relative movement between the magnets 200 to 214 and the bridges 218, 220. The relativeness, perse, depends on the distance 5 between the magnets 200 to 214 and/or the distance between the magnetoimpedance components 250 to 264 in manner known to the person skilled in the art.

The signal processing unit 152 then forms a property value related to the flowing material 108 on a basis of a ratio of the signal values provided by the 10 bridges 218, 220. In an embodiment, the property value may refer to consistency.

In an embodiment, the property value may refer to viscosity. In an embodiment, the property value may refer to density.

If the deviation i.e. phase shift of the output signals of the bridges 218,

220 is π/2 in an embodiment, the first bridge 218 may output its signal value as a sine of the relative movement between the magnets 200 to 214 and the first bridge 218, and the second bridge 220 may output its signal value as a cosine of the relative movement between the magnets 200 to 214 and the second bridge 220. The sine and cosine include noise which may be caused by temperature, for example.

This embodiment also provides a simple example of the general operation of the double bridge. It can be written that the output signal si of the first bridge 218 is si = sin(a), and the output signal s2 of the second bridge 220 is s2 = cos(of). Then the relative movement m between the magnets 200 to 214 and the bridges 218, 220 may mathematically expressed as m = arctan[sin(oc)/cos(oc)]. The relative movement m is also related to the flowing material 108 because the flowing material causes the relative movement.

Temperature and particularly its variation cause unpredictable changes to the output signals of the bridges 218, 220. Then, the output signal si of the first bridge 218 maybe expressed as si = k(T, t)* sin(a), and the output signal 30 s2 of the second bridge 218 may be expressed as s2 = k(T, t)* cos(a), where k is a unwanted noise factor which depends on T and t and which is associated with the

20165830 prh 18-12-2018 sine and cosine functions, T is temperature and t is time. It may be assumed the noise factor k of the bridges 218, 220 is at least approximately similar to both of the bridges 218, 220. The noise factor k may also include error features of the supply voltage.

In an embodiment, the signal processing unit 152 may form the property value related to the flowing material 108 as an inverse tangent of the ratio of the sine of the relative movement between the component of magnets 200 to 214 and the first bridge 218, and the cosine of the relative movement between the component of magnets 200 to 214 and the second bridge 220.

The R ratio of the output signals si and s2 is independent of the unpredictable changes of the temperature, R = [k(T, t)* sin(a)]/[k(T, t)* cos(oc)] = sin(oc)/cos(oc), when the temperature T is the same for both of the bridges 218, 220 and the time t is the same for both of the output signals. In this manner, the relative movement m between the magnets 200 to 214 and the bridges 218, 220 may mathematically expressed as m = arctan[sin(oc)/cos(oc)], where arctan is the inverse tangent. If only one bridge 218, 220 were used, the temperature and time dependent term k(T, t) couldn’t be eliminated and the measurement result would be deteriorated by this error.

In general, the output signal si of the first bridge 218 may be expressed as si = k(T, t)* fl(oc), and the output signal s2 of the second bridge 218 may be expressed as s2 = k(T, t)* f2(oc), where f( 1) denotes a function associated with the behavior of the output signal values of the first bridge 218 and f(2) denotes a function associated with the behavior of the output signal values of the second bridge 220. The noise term k is associated with the function fl and f2. It may also be assumed the noise factor k is at least approximately similar to both of the bridges 218, 220.

Even in the case the noise factor k of one of the bridges 218, 220 is different from another of the bridges 218, 220, the noise factors of the bridges follow each other which is why forming their ratio has tendency to improve the 30 measurement.

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In an embodiment an example of which is illustrated in Figure 4, the sensor system may comprise an analog-digital converter arrangement 400 which may convert analog signals output by the two bridges 218, 220 to digital signals in a synchronized manner. The analog-digital converter arrangement 400 may 5 include at least two analog-digital converters if the conversion is performed parallel. The analog-digital converter arrangement 400 may include only one analog-digital converter if the conversion is performed serially. The signal processing unit 152 may perform operations for forming the property value related to the flowing material 108 in a digital form. If the output signals of the 10 bridges 218, 220 are converted at different moments of time, the forces against the projection 106 may also differ and noise may be different resulting in different output signals. When the output signals of the bridges 218, 220 are converted simultaneously, both output signals are based on the same force against the projection 106. The noise factor k may also be more similar such that 15 the ratio cancels it out at least partly.

Figure 5 illustrates an example of the coupling of the magnetoimpedance components 250 to 264 (see also Figure 2j. Operational supply electric power poles 500, 502 are for connecting operational electric power to the bridges 218, 220. The first bridge 218 has an output terminal 504 20 for outputting the first output signal. The first bridge 218 has an output terminal 506 for outputting the first output signal in an opposite polarity with respect to the output signal of the output terminal 504. Either or both output signals may be used in the measurement.

The second bridge 220 has an output terminal 508 for outputting the 25 second output signal. The second bridge 220 has an output terminal 510 for outputting the first output signal in an opposite polarity with respect to the output signal of the output terminal 508. Either or both output signals may be used in the measurement.

In an embodiment, the sensor system may interchange polarity of 30 operational power of the bridges 218, 220 for making one measurement using one polarity and making another measurement using an opposite polarity. The

20165830 prh 18-12-2018 pole 500 may be coupled with a positive voltage and the pole 502 may be coupled with ground for one measurement. Next, the pole 500 may be connected with ground and the pole 502 may be connected with a positive voltage for a next measurement. Then, the signal processing unit 152 may form the value related to 5 the flowing material on the basis of at least two of the ratios measured with opposite polarity of the electrical poles 500, 502 of operational power of the bridges 218, 220. The interchange of the polarity of the operational voltage of the bridges 218, 220 for different measurements allows cancellation of offset of the bridges 218, 220.

Figure 6 illustrates an example of the sensor system with a reaction element 600 which comprises a spring structure 602, a stable structure 604 and a moving structure 606. The reaction element 600 may be like a plate which has a patterned hole 612 and the thickness of which is smaller than its breadth and width. A direction of a normal of the plate surface may be the same as a normal of a surface of the projection 106. That is, the projection 106 and the reaction element 600 may be parallel. Material of the reaction element 600 may be steel or the like. The spring structure 602 may comprise a wall structure which is thinner than the wall elsewhere in the reaction element 600.

In an embodiment, the magnets 200 to 214 may be located at the 20 stable structure 604 and the bridges 218, 220 may be located at the moving structure 606 (shown in Figure 6). In an alternative embodiment, the bridges 218, 220 may be in the stable structure 604 and the magnets 200 to 214 may be in the moving structure 606 (not shown in Figures).

In general, either at least one of the magnets 200 to 214 or at least one 25 pair of the bridges 218, 220 is located at the stable structure 604, and either at least one pair of the bridges 218, 220, as counterpart to the at least one of the magnets 200 to 214, or at least one of the magnets 200 to 214, as a counterpart to the at least one pair of the bridges 218, 220, is located at the moving structure 606. That is, at least one magnet 200 to 214 and at least one pair of the bridges 30 218, 220 may reside in the stable structure 604. In a similar manner, at least one magnet 200 to 214 and at least one pair of the bridges 218, 220 may reside in the

20165830 prh 18-12-2018 moving structure 606. Then the at least one magnet in the stable structure 604 and the at least one pair of bridges in the moving structure 606 are matched with each other. The at least one pair of the bridges in the stable structure 604 and the at least one magnet in the moving structure 606 are also correspondingly 5 matched with each other.

The stable structure 604 and the moving structure 606 may physically be coupled to each other with the spring structure 602. The spring structure 602 may allow movement A between the stable structure 604 and the moving structure 606 in a longitudinal direction DI of the magnets 200 to 214. The spring 10 structure 602 may provide an equal and opposite spring force against the force of the blade structure 120, which has a physical connection with the moving structure 606.

A hinge structure 608 may couple the stable structure 604 with a nonmoving support 610 (only partly shown in Figure 6) of the blade transmitter, and 15 prevent movement A of the stable structure 604 in the longitudinal direction of the magnets 200 to 214, and allow movement B of the reaction element 600 as a whole in a direction D2 perpendicular to the longitudinal direction DI of the magnets 200 to 214. The hinge structure 608 may allow the movement B by bending or turning around an axis. The magnets 200 to 214 and the bridges 218, 20 220 haven’t direct physical connection. Because they are physically contactless, they don’t require overload protection.

Figure 7 also illustrates an example of the sensor system with a reaction element 600. In Figure 7 the reaction element 600 is slightly deformed because of the force from the blade structure 120 which has turned a little around 25 the supporting axis 110. The blade structure 120 has turned because the flowing matter 108 has pushed the projection 106. The deformation of the reaction element 600 has caused the magnets 200 to 214 and the bridges 218, 220 shift with respect to each other because the spring structure 602 has bent a little.

Because the supporting axis 110 is between the blade 106 and the 30 sensor system 150, the arm 102 may move in the opposite direction to the flow.

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If the supporting axis 110 is above the sensor system 150 such that the sensor system 150 is between the process pipe 114 and the supporting axis 110 (see Figure IB), the arm 102 may move in the same direction as the flow. The movement between the bridges 218, 220 and the magnets 200 to 214 may then 5 be opposite to the embodiment where the supporting axis 110 is between the blade 106 and the sensor system 150.

The magnets 200 to 214 and the bridges 218, 220 may be located at a supporting rod of a blade structure 120 (not shown in Figures).

In an embodiment an example of which is illustrated in Figure 8, the 10 signal processing unit 152 may comprise one or more processors 800 and one or more memories 802 including a computer program code. The one or more memories 802 and the computer program code are configured to, with the one or more processors 800, cause the signal processing unit 152 at least to form the property value related to the flowing material 108 on the basis of the ratio of the 15 signal values provided by the bridges 218, 220.

Figure 9 is a flow chart of the measurement method. In step 900, two anisotropic magnetoimpedance bridges 218, 220 having a magnetic orientation deviation therebetween, and magnets 200 to 214, located adjacent to and matched with the bridges 218, 220 for providing a magnetic field to the bridges 20 218, 220, are allowed to move with respect to each other in a direction of the successive magnets 200 to 214 in response to movement of a blade structure 120 of the blade transmitter subjected to force of flowing material 108. In step 902, signal values of the bridges 218, 220 are output as a function of the movement. In step 904, a property value related to the flowing material 108 is formed on a basis 25 of a ratio of the signal values provided by the bridges 218, 220 by a signal processing unit 152.

The method shown in Figure 9 may be implemented as a logic circuit solution or computer program. The computer program may be placed on a computer program distribution means for the distribution thereof. The computer 30 program distribution means is readable by a data processing device, and it encodes the computer program commands, carries out the measurements and optionally controls the processes on the basis of the measurements.

The computer program may be distributed using a distribution medium which may be any medium readable by the controller. The medium may 5 be a program storage medium, a memory, a software distribution package, or a compressed software package. In some cases, the distribution may be performed using at least one of the following: a near field communication signal, a short distance signal, and a telecommunications signal.

It will be obvious to a person skilled in the art that, as technology advances, the inventive concept can be implemented in various ways. The invention and its embodiments are not limited to the example embodiments described above but may vary within the scope of the claims.

Claims

1. A sensor system for a blade transmitter, characterized in that the blade transmitter is configured to measure fluid material which

The sensor system (150) comprises a signal processing unit (152) and a reaction element (600) which is plate-shaped and has a shaped hole (612);

magnets (200-214) in a sequential order; and a bridge sensor (216) having two anisotropic magnetic impedance bridges (218, 220); the reaction element (600) comprising

10 a spring structure (602), a stable structure (604) and a moving structure (606) interconnected by a stable structure (604) and a movable structure (606) configured to allow movement of the stable structure (604) and the movable structure (604); between the structure (606) in the longitudinal direction of the magnets (200-214);

The magnets (200-214) are located adjacent to and adapted to the bridges (218, 220) to provide a magnetic field for the bridges (218, 220); magnets (200214) and bridges (218, 220) configured to move relative to each other in the direction of successive magnets (200-214) due to the deflection of the spring structure (602);

20 in response to the movement of the blade structure (120) exposed to the force of the fluid (108), the bridges (218, 220) are configured to transmit signal values as a function of movement; and the signal processing unit (152) is configured to generate a property value associated with the fluid (108) based on the signal values provided by the bridges (218, 220).

Sensor system according to claim 1, characterized in that the first bridge (218) of the two bridges (218, 220) is configured to transmit its signal value in relative motion between the magnets (200-214) and the first bridge (218) in blue, and the second bridge (220). two bridges (218,

220) is configured to transmit its signal values in cosine relative motion between the component of the magnets (200-215) and the second bridge (220).

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Sensor system according to claim 2, characterized in that the signal processing unit (152) is configured to generate a characteristic value associated with the fluid (108) relative to the sine and magnets (200-) of relative motion between the magnets (200-214) and the first bridge (218).

5,214) and the second bridge (220) relative inverse tangent to cosine.

Sensor system according to claim 1, characterized in that the sensor system comprises an analog-to-digital converter arrangement (400) configured to convert the analog signals transmitted by two bridges (218, 220).

10 signals are synchronized to digital signals, and the signal processing unit (152) is configured to perform functions in digital form.

Sensor system according to Claim 1, characterized in that the sensor system is configured to exchange bridges (218, 220).

15, the signal processing unit (152) is configured to generate a value associated with the fluid (108) based on at least two ratios measured by the opposite polarity of the operating voltage of the bridges (218, 220).

20

A sensor system according to claim 1, characterized in that the sensor system comprises a reaction element (600) comprising a spring structure (602), a stable structure (604) and a movable structure (606); and the stable structure (604) and the movable structure (606) are interconnected by a spring structure (602) configured to allow movement of the stable structure

25 (604) and a movable structure (606) in the longitudinal direction of the magnets (200-214);

a hinge structure (608) configured to connect the stable structure (604) to the stationary support (610) of the blade transmitter and to prevent the stable structure (604) from moving in the longitudinal direction of the magnets (200-214), and

20165830 prh 18-12-2018 to permit the entire movement of the reaction element (600) in a direction perpendicular to the longitudinal direction of the magnets (200-214); and which at least one of the magnets (200-214) or at least one pair of bridges (218, 220) is located in a stable structure (604) and either one of the pairs of bridges (218, 5 220) counterpart to at least one of the magnets (200-214) or of magnets (200-214), the counterpart to at least one pair of bridges (218, 220), is located in the movable structure (606).

A sensor system according to claim 1, characterized in that the signal processing unit (150) comprises

10 one or more processors (800); and one or more memory (802) containing computer program code;

one or more memory (802) and computer program code (800) configured by said one or more processors (800) to provide 15 signal processing units (150) at least:

forming a property value associated with the fluid (108) based on the ratio of signal values produced by the bridges (218, 220).

A method for measuring a blade transmitter, characterized in that the sensor system (150) comprises

The reaction element (600), which is plate-shaped and shaped with a hole (612), and the reaction element (600) comprises a spring structure (602), a stable structure (604) and a movable structure (606), which are a stable structure (604) and (606) is interconnected by a spring structure (602) which allows movement between the stable structure (604) and the movable structure (606)

25 magnets (200-214) in the longitudinal direction and allowing (900) two anisotropic magnetic impedance bridges (218, 220) and magnets (200214) adjacent to and adapted to the bridges (218, 220) to provide a magnetic field for the bridges (218, 220), move relative to one another in the direction of successive magnets (200-214) due to the deflection of the spring structure (602) in response to movement of the blade transmitter blade structure (120) as a result of the force exerted by the fluid (108);

transmitting (902) signal values of the bridges (218, 220) as a function of movement; and

5, generating (904) with the signal processing unit (152) a property value associated with the fluid (108) based on the signal values provided by the bridges (218, 220).