KR20140101096A - Method for processing signal of non-contact distance displacement sensor and apparatus thereof - Google Patents

Abstract

A signal processing method and apparatus for a non-contact distance displacement sensor are disclosed. A signal processing method of a non-contact distance displacement sensor according to an embodiment of the present invention is a signal processing method of a non-contact distance displacement sensor including a first coil, a second coil, and a target metal plate spaced apart from each other by a predetermined distance, Receiving a first voltage having an amplitude proportional to a Q-factor corresponding to a distance between the coil and the target metal plate; Receiving a second voltage having an amplitude independent of a distance between the second coil and the target metal plate; And a modeling of the first voltage predetermined for a relationship between the Q-factor and the distance, a linear correlation of the distance between the first coil and the target metal plate based on the received first voltage and the second voltage Generating an output voltage having a first voltage and a second voltage, wherein generating the output voltage comprises: determining a plurality of parameters determined by modeling the first voltage and a ratiometric value of the first voltage and the second voltage, To generate the output voltage to provide linearity with respect to the distance to the target metal plate, thereby providing accuracy and reliability of the measured distance.

Description

TECHNICAL FIELD [0001] The present invention relates to a non-contact distance displacement sensor,

The present invention relates to a signal processing of a non-contact distance displacement sensor, and in particular, to a non-contact distance displacement sensor capable of compensating for non-linearity between a Q factor and a distance, And a signal processing method and apparatus for the distance displacement sensor.

The present invention was derived from the research carried out by the Ministry of Education, Science and Technology and the Korea Research Foundation as part of the training of regional innovation manpower. [Task Control Number: 2012026206, Title: Development of next generation integrated touch controller for touch panel and power semiconductor design manpower business].

Non-contact displacement sensors are used in industrial precision measuring instruments with high precision and reliability, and have a disadvantage in that they are larger and slower in response speed than sensors having different volume and area. However, due to the development of circuit technology, coils, which are the core of noncontact sensors, PCB), the size can be reduced and the frequency used can be increased to improve the response speed.

This non-contact displacement sensor is a means for measuring the distance from the target by outputting a voltage or a current value according to the distance from the target, and is mainly used for various parts of the marine engine (crankshaft, main bearing, crankpin bearing, Bearings, etc.), and is used for detecting the displacement of a brake pedal sensor or an accelerator pedal sensor of an automobile.

An eddy current sensor using eddy current, which is one of the non-contact displacement sensors, measures a distance between a coil serving as a probe and a metal plate as a target. A magnetic field is formed in a coil through which a current flows, When a coil is placed on a metal plate, an eddy current is formed in the metal plate to form a magnetic field in a direction that cancels the magnetic flux of the coil. This process reduces the inductance of the coil, increases the energy consumed by the eddy current, and increases the resistance of the coil.

That is, as the distance between the coil and the metal plate becomes closer, the Q-factor of the coil decreases sharply. Therefore, the sensor output can be generated by sensing the Q-factor varying with distance. However, since the relationship between the Q-factor and the distance is non-linear, there is a problem that the sensor output is not proportional to the distance, and there is also a problem in that it is affected by changes in the external environment such as temperature and humidity.

Therefore, it is necessary to ensure the linearity of the sensor output of the non-contact displacement sensor. Although there are commercially available sensors that guarantee linearity even under special circumstances, since the price is high, in general, the linearity is corrected through a separate correction operation.

Korean Patent No. 10-1049669 (registered on July 8, 2011)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and it is an object of the present invention to provide a signal processing method of a non-contact distance displacement sensor capable of linearly correcting a relationship between a Q- The purpose is to provide.

More particularly, the present invention relates to a modeling method for modeling the output voltage of a first coil that varies nonlinearly with distance in a distance displacement sensor that measures a distance between a moving means including two coils spaced apart at a predetermined distance and a target metal plate in a non- And generating an output voltage having a linear correlation with the distance, based on a ratiometric relation to the output voltage of the first coil and the output voltage of the second coil, Which is capable of providing linearity with respect to the distance of the contactless distance displacement sensor, and an apparatus therefor.

It is another object of the present invention to provide a signal processing method and apparatus for a noncontact displacement sensor capable of providing accuracy and reliability to a measurement distance by providing linearity with respect to distance through signal processing.

According to an aspect of the present invention, there is provided a signal processing method for a non-contact distance displacement sensor, including a first coil and a second coil spaced apart from each other by a predetermined distance, and a non-contact distance displacement sensor including a target metal plate A signal processing method comprising: receiving a first voltage having an amplitude proportional to a Q-factor corresponding to a distance between the first coil and the target metal plate; Receiving a second voltage having an amplitude independent of a distance between the second coil and the target metal plate; And a modeling of the first voltage predetermined for a relationship between the Q-factor and the distance, a linear correlation of the distance between the first coil and the target metal plate based on the received first voltage and the second voltage ≪ / RTI >

The step of generating the output voltage may generate the output voltage using a plurality of parameters determined by modeling the first voltage and a ratiometric ratio of the first voltage and the second voltage.

The plurality of parameters may be determined by information on the non-contact distance displacement sensor and modeling of the first voltage.

The step of generating the output voltage may generate the output voltage comprising a first parameter indicative of a linear correlation between the distance between the first coil and the target metal plate and the Q-factor.

The receiving of the second voltage may receive the output signal of the second coil regulated by the LC oscillator at the second voltage independent of the distance between the second coil and the target metal plate.

The modeling of the first voltage may be modeling in inverse proportion to the square of the distance between the first coil and the target metal plate or modeling in inverse proportion to the distance between the first coil and the target metal plate.

A signal processing apparatus of a non-contact distance displacement sensor according to an embodiment of the present invention includes a target metal plate; Moving means including a first coil and a second coil spaced apart at regular intervals; And a controller configured to receive a first voltage of the first coil and a second voltage of the second coil according to a distance between the moving means and the target metal plate and to receive the first voltage and the second voltage, And a signal processor for generating a third voltage having a linear correlation with a distance between the first coil and the target metal plate based on modeling of the first voltage predetermined for the relationship between the Q-factor and the distance, , The first voltage has an amplitude proportional to the Q-factor with respect to the distance to the target metal plate, and the second voltage has an amplitude independent of the distance from the target metal plate.

Furthermore, the apparatus according to the present invention may further comprise a parameter adjustment unit for adjusting the plurality of parameters used for generating the third voltage based on the modeling of the first voltage.

Furthermore, the apparatus according to the present invention may further comprise a regulation unit for regulating the output signal of the second coil to the second voltage using the LC regulation.

According to the present invention, a model representing the linear correlation between the Q-factor and the distance is determined using modeling for the output voltage of the first coil that varies nonlinearly with distance, and the determined parameter, the output voltage of the first coil By providing a linearly correlated output voltage on the basis of the ratiometric of the output voltage of the second coil and the output voltage of the second coil, .

That is, the present invention uses a ratiometric of two voltages for eliminating a parameter indicating a linear correlation and a factor caused by the surrounding environment, thereby reducing the output voltage having a linearity Can be provided.

Further, the present invention can improve the accuracy and reliability of the distance measurement by providing a linearity with respect to the distance to the target metal plate through signal processing.

FIG. 1 is a conceptual diagram of an embodiment of a signal processing apparatus for a non-contact distance displacement sensor according to the present invention.
2 is a block diagram of a signal processing apparatus for a non-contact distance displacement sensor according to an embodiment of the present invention.
FIG. 3 is a graph of an embodiment of the output voltage according to the distance of the two coils shown in FIG.
4 shows a graph of one embodiment of modeling for the first voltage of the first coil and its error.
5 illustrates one embodiment of modeling for a first voltage of a first coil according to a distance range.
Figure 6 shows a graph of an embodiment of the linearity between the distance and the output voltage generated through the signal processing of the present invention.
7 is a flowchart illustrating a signal processing method of a non-contact distance displacement sensor according to an embodiment of the present invention.
FIG. 8 shows an operational flow diagram of an embodiment of step S740 shown in FIG.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the accompanying drawings.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the term "comprising" or " comprising " is intended to specify the presence of stated features, integers, steps, operations, elements, parts or combinations thereof, , But do not preclude the presence or addition of one or more other features, elements, components, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

However, the present invention is not limited to or limited by the embodiments. Like reference symbols in the drawings denote like elements.

Hereinafter, a signal processing method and apparatus for a contactless distance displacement sensor according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 8. FIG.

1 is a conceptual diagram of an embodiment of a signal processing apparatus for a contactless distance displacement sensor according to the present invention. As shown in FIG. 1, the signal processing apparatus for a contactless distance displacement sensor of the present invention includes mechanical means The output signal of the signal processing unit 130 for the distance from the target metal plate 110 output from the two coils 121 and 122 constituted by the moving means 120 moving in the left and right direction by the brake pedal, Thereby generating an output voltage having linearity according to the distance.

In this case, the first coil 121 and the second coil 122 are spaced apart by a predetermined distance d1 from the moving means 120, and the output signal of the first coil 121 is transmitted to the target metal plate 110 And the output signal of the second coil 122 may be an output signal that is independent of the distance from the target metal plate 110.

The signal processing unit 130 generates a signal according to the distance based on the modeling of the output signal of the first coil 121, the output signal of the second coil 122, and the first voltage corresponding to the output signal of the first coil 121. [ (V _OUT ) having linearity and a distance between the first coil 121 and the target metal plate 110 can be measured based on an output voltage (V _OUT ) having a linear correlation with the generated distance have.

The device according to the present invention will be described in detail with reference to Fig.

2 is a block diagram of a signal processing apparatus for a non-contact distance displacement sensor according to an embodiment of the present invention.

2, the apparatus includes a first coil 121, a second coil 122, a peak detection unit 140, a regulation unit 150, a parameter adjustment unit 160, and a signal processing unit 130 .

1, the first coil 121 is disposed on the moving means 120 and is located closer to the target metal plate 110 than the second coil 122. The distance between the first coil 121 and the target metal plate 110 And outputs a first output signal having an amplitude proportional to a Q-factor corresponding to the Q-factor.

1, the second coil 122 is disposed on the moving means 120 and is located farther from the target metal plate 110 than the first coil 121 and is located at a distance from the target metal plate 110 And outputs a second output signal having an independent amplitude.

In this case, since the loss of the second coil 122 due to the target metal plate 110 is small due to the distance d1 between the first coil 121 and the first coil 121, for example, 4 mm, And can provide the signal processing unit 130 with a signal V2 having an amplitude that is independent of the distance through the regulation by the regulation unit 150 even if it is affected to some extent by the target metal plate 110 .

The regulation unit 150 regulates the second output signal to a signal having an amplitude independent of the distance from the target metal plate 110 using an LC oscillator.

Here, the regulation unit 150 may be omitted depending on the situation. That is, when the second coil 122 is separated from the first coil 121 by a predetermined distance or more and the influence of the target metal plate 110 can be ignored, the second output signal of the second coil 122 is independent of the distance In this case, the configuration of the regulation section 150 may be removed.

Although the regulation unit 150 is shown as being connected to the peak detection unit in FIG. 2, it may be disposed between the output end of the second coil 122 and the peak detection unit 140, depending on the embodiment.

The peak detector 140 detects a peak voltage for the first output signal and the second output signal output from the first coil 121 and the second coil 122 and detects the peak voltage of the first output signal of the first coil 121 The voltage V1 and the second voltage V2 of the second coil 122 can be provided to the signal processor 130. [

At this time, as in the example shown in Figure 3, the first voltage (V1, Coil1 V _{P -P)} provided from the peak search unit 140, a signal processor 130, depending on the distance to the target plate (110) variable, and the second voltage (V2, V Coil2 _PP), it can be seen that the amplitude is kept constant independently of the distance to the target plate (110).

The second voltage V2 in the embodiment of the present invention can be used to eliminate a change due to the influence of environmental factors such as temperature, humidity, and the like, and the first voltage V1 ). ≪ / RTI >

Of course, depending on the situation, the peak detecting section 140 may provide a current value corresponding to the detected peak voltage.

The parameter adjustment unit 160 generates an output voltage having a linear correlation with the distance between the first coil 121 and the target metal plate 110, that is, an output voltage converted to have a linear correlation in the signal processing unit 130 (K _G , K _L , V _OS ) to be used to adjust the parameters.

In this case, the plurality of parameters may be determined by predetermined modeling of the first voltage of the first coil 121, and the parameter adjusting unit 160 may adjust the plurality of parameters thus determined. Such a plurality of parameters is not limited to being adjusted by the parameter adjustment unit 160 and may be adjusted through control by an external input.

The plurality of parameters may include a first parameter indicative of a linear correlation between the distance between the first coil 121 and the target metal plate 110 and the Q-factor, .

Further, a plurality of parameters can be determined by modeling the first voltage and information on the non-contact distance displacement sensor to which the present invention is applied. That is, the plurality of parameters may vary depending on the range of the distance to be measured by the non-contact distance displacement sensor, or may vary depending on the type of modeling of the first voltage. The modeling of the first voltage in the present invention may refer to a predetermined modeling of the relationship between the Q-factor and the distance (here, the distance between the target metal plate).

The signal processing unit 130 receives the first voltage V1 of the first coil 121 and the second voltage V2 of the second coil 122 detected by the peak detector 140, The first coil 121 and the target metal plate 110 have a linear correlation with the distance between the first coil 121 and the target metal plate 110 based on a predetermined modeling of the voltage V1, the second voltage V2 and the first voltage V1. And generates a third voltage corresponding to the voltage V1.

In this case, the third voltage may be generated by a linear function determined by using a plurality of parameters adjusted by the parameter adjusting unit 160, the first voltage and the second voltage received from the peak detecting unit 140, A portion for generating the third voltage corresponding to the distance using the linear function will be described as follows.

3, the first voltage (Coil1 V _{P -P} ) of the first coil changes nonlinearly with respect to the distance x. If the first voltage is approximated by a mathematical expression, it can be expressed by Equation (1) .

[Equation 1]

Here, y denotes a function approximating the first voltage, and k, a, b, and c are coefficients for approximating the first voltage of the first coil, and can be determined by an approximation process.

The function of the approximated first voltage is converted into a function linearly proportional to the distance x, which can be expressed as Equation (2) below.

&Quot; (2) "

Here, V _OUT means an output voltage, i.e., a third voltage, output by the signal processing unit 130.

As can be seen from Equation (2), the converted function, that is, the output voltage V _OUT of the signal processing unit 130 is proportional to the distance, and processes the first voltage of the first coil modeled by Equation (1) , And can be expressed as Equation (3) below.

&Quot; (3) "

The output voltage V _OUT of the converted signal processing unit 130 is replaced with a ratiometric form of the first voltage and the second voltage so that there is no change due to environmental factors such as temperature, Can be expressed by Equation (4) as follows.

&Quot; (4) "

Here, K _G , K _L , and V _OS are a plurality of parameters determined by the modeling of the first voltage described above, K _G means a parameter for adjusting the slope of the linear output voltage V _OUT to be converted, and V _OS stands for an offset parameter for adjusting an offset (offset) of the output voltage V _OUT, and, K _L is the output voltage means a parameter for adjusting the linearity of the V _OUT, K _L is the distance between the first coil and the target plate and Q - a parameter indicating the linear correlation between the factors.

The graph of the output voltage function thus generated can provide a linear result proportional to the distance between the first coil and the target metal plate through signal processing in the signal processing unit, as in the example shown in FIG. 6 shows a linear output voltage V _OUT for a case where the minimum distance between the target metal plate 110 and the first coil 121 is 1.5 mm and the maximum distance is 8 mm. , The slope, offset and linearity of the output voltage V _OUT can be adjusted using the parameters of Equation (4) above.

Also, modeling for the first voltage (Coil1 V _{P -P} ) of the first coil used in the above equations is modeling (1 / d < ² > model) or modeling (1 / d model) that is inversely proportional to distance.

The graph shown in FIG. 4A is modeled so as to be inversely proportional to the square of the distance and the distance to the first voltage (Coil1 V _{P -P} ) of the first coil along the distance, and FIG. The graph shows the error between the actual first voltage (Coil1 V _{P -P} ) of the coil and the two modeling (1 / d ² model, 1 / d model).

4, when the distance d between the first coil and the target metal plate approaches, the first voltage decreases as the first coil approaches the target metal plate and the magnetic flux passing through the first coil due to electromagnetic induction on the target metal plate decelerates The inductance L increases due to the reduction of the magnetic flux, and the resistance R of the first coil increases due to energy loss in the eddy current generated in the target metal plate. The Q-factor is proportional to the frequency w and the inductance L, and is expressed as wL / R, which is inversely proportional to the resistance R. The Q- That is, as the distance of the first coil approaches, the Q-factor decreases and the reduced Q-factor is proportional to the strength of the magnetic field. According to the Biot-Savart Law, the intensity of the magnetic field generated by the current is proportional to the inverse square (1 / d ² ) of the distance in the current, so the reduction of the Q-factor is also proportional to the inverse square of the distance As can be seen from the error shown in FIG. 4B, it can be seen that the error is within 3 [%] in the region where the distance is larger than 0.2 [mm]. In the embodiment of the present invention, not only the modeling proportional to the inverse square of the distance but also the modeling proportional to the inverse of the distance can be used as shown in Fig. Of course, as shown in FIG. 4B, in the case of a 1 / d model that is proportional to the inverse of the distance, there is a disadvantage in that the error is large in a region where the distance is less than 0.5 [mm] The error is less than 4 [%] and the error is less than 1 [%] at 5 [mm] or more. Therefore, modeling proportional to the inverse of the distance may be applied depending on the measurement distance of the non-contact distance displacement sensor.

The reason why the modeling (1 / d ² model) proportional to the inverse square of the above-described distance as well as the modeling (1 / d model) proportional to the inverse of the distance can be used will be described with reference to FIG.

FIG. 5 schematically shows the modeling proportional to the reciprocal of the distance and the modeling proportional to the reciprocal of the distance using a Taylor polynomial. FIG. 5A shows the approximation of the distance range from 0 [mm] to 8 [mm] , And Fig. 5B shows the range of the distance approximated from 1.5 [mm] to 8 [mm]. Equation 5 using the Taylor equation for modeling proportional to inverse square and proportional to the inverse of distance can be expressed as Equation (5) below.

&Quot; (5) "

Here, y _{1 / d2} indicates the model (510, 530) using the Taylor equation proportional to the inverse square of the distance, y _{1 / d} is modeled by the Taylor equation is proportional to the inverse of the distance (520, 540) the it means.

The difference of the approximation formula for both modeling can be expressed as Equation (6) below.

&Quot; (6) "

Referring to FIGS. 5A and 5B, an approximate expression of two modeling approximated using Equation (5) is applied to Equation (6), as shown in Equation (7) below.

&Quot; (7) "

As can be seen from Equation ( ₇₎ , when the range of the distance is 1.5 to 8 [mm] in comparison with the difference value (Δy _{(0 to 8)} ) of the approximation expression for the range of the distance of ₀ to 8 [mm] _{(1.5 / 8)} ) is small, and it is possible to use a 1 / d model that is proportional to the inverse of the distance in the range of 1.5 to 8 [mm] . That is, modeling proportional to the inverse of the distance can be used for non-contact distance displacement sensors that measure a range of distances.

Also, since the modeling of the first voltage used in the present invention is based on the difference between the second voltage that maintains a constant value and the first voltage that varies with distance, as denoted by Equation (4) For example, within a range of 3 [mm], the difference between the first voltage and the second voltage is sufficiently large even if there is a slight error, For example, when the voltage is 3 [mm] or more, the difference between the second voltage and the second voltage is relatively small, so that a slight error also works. Therefore, it is desirable to use modeling that can reduce the error for a region over a certain distance.

As described above, the signal processing unit 130 according to the present invention is capable of modeling (1 / d ² model) proportional to the inverse square of the distance between the first coil and the target metal plate or modeling 1 / d model ) Is used as a model for the first voltage of the first coil to determine a plurality of parameters included in Equation (4) having a linear correlation with respect to the distance, and the determined plurality of parameters and the first coil By generating an output voltage (V _OUT ) having a linearity in distance based on the ratio of the first voltage (V1) and the second voltage (V2) output from the second coil . That is, the present invention generates and determines a plurality of parameters included in a function having a linear correlation between a distance and a Q-factor through signal processing, thereby providing linearity with respect to distance, Accuracy can be provided.

FIG. 7 is a flowchart illustrating an operation of a signal processing method of a non-contact distance displacement sensor according to an embodiment of the present invention. FIG. 7 is a flowchart illustrating an operation of the apparatus according to the present invention shown in FIG.

7, a method according to the present invention comprises the steps of receiving a first output signal having an amplitude proportional to a Q-factor corresponding to a distance from a target metal plate output from a first coil, And receives a second output signal having an amplitude independent of the distance from the target metal plate (S710).

When the second output signal is received from the second coil, the second output signal is generated by a distance-independent second voltage through regulation using an LC oscillator (OSC) (S720).

Here, in step S720, the second output signal of the second coil is subjected to a certain degree of influence by the distance to regulate it, thereby having an amplitude independent of the distance. Depending on the degree of influence by the distance, step S720 may be omitted have.

The voltage received or generated in steps S710 and S720 may be the voltage before the peak detection is performed. That is, the peak value (or peak-to-peak value) of the output signal of the signal output from the first coil and the second coil is detected by the peak detecting means, and the detected peak value is compared with the first voltage of the first coil And becomes the second voltage of the second coil.

When the first voltage of the first coil and the second voltage of the second coil are received (S730), the predetermined modeling for the first voltage and the second voltage of the second coil based on the received first voltage and the second voltage And generates an output voltage V _OUT having a linear correlation with the distance (S740).

That is, step S740 is a step of converting the first voltage of the first coil having the nonlinear characteristic with respect to the distance to the target metal plate into the linearly correlated output voltage V _OUT .

At this time, the output voltage (V _OUT ) to be converted may include a first parameter indicative of a linear correlation between the distance between the first coil and the target metal plate and the Q-factor, Which will be described with reference to FIG.

When an output voltage (V _OUT ) having a linear correlation with the distance is generated, a distance between the target metal plate and the first coil is extracted based on the generated output voltage (V _OUT ) (S 750).

That is, the distance corresponding to the first voltage outputted from the first coil can be calculated based on the graph or the function for the output voltage (V _OUT ) having a linearity according to the distance.

FIG. 8 shows an operational flow diagram of an embodiment of step S740 shown in FIG.

8, a step (S740) for generating an output voltage (V _OUT) corresponding to the distance is linear for the length of the advance and the output voltage (V _OUT) based on the determined model for the first voltage of the first coil A plurality of parameters for adjusting the correlation are determined (S810).

A parameter for the plurality of parameters are adjusted to a linear output voltage V _OUT parameter, the linearity of the output voltage V _OUT to the parameter, to adjust the offset of the output voltage V _OUT to control the slope of the described expression (4) is determined in step S810 .

Here, the plurality of parameters is determined by modeling the first voltage, but not limited thereto, and may be determined by further considering information on the non-contact distance displacement sensor as well as modeling the first voltage. That is, a plurality of parameters may be determined by further considering the range of the distance measured by the non-contact distance displacement sensor, the application field, the characteristics of the sensor, and the like.

The modeling of the first voltage to determine the plurality of parameters may be modeling proportional to the inverse square of the distance between the target metal plate and the first coil or may be modeling proportional to the inverse of the distance, It is possible to select any one of the modeling selectively according to the range of the distance.

A plurality of parameters are determined and the influence of environmental factors such as temperature, humidity, etc. is removed by using the ratiometric of the first voltage V1 of the first coil and the second voltage V2 of the second coil (S820).

Although steps S810 and S820 are shown to be performed sequentially in FIG. 8, the present invention is not limited thereto, and the two steps may be performed in parallel, and step S810 may be performed after step S820 is performed.

When the ratio (V1 / V2) of the plurality of parameters and the two voltages is calculated or determined in steps S810 and S820, the distance (V1 / V2) The output voltage V _OUT having a linear correlation with the output voltage V _OUT is generated (S830).

As described above, K _G , K _L , and V _OS are a plurality of parameters determined by the modeling of the first voltage described above. The plurality of parameters may be adjusted by the parameter adjustment unit 160 or may be controlled by an external input as described above. For example, it is possible to selectively adjust the main parameters among a plurality of parameters using measurement results on the characteristics of the hardware. For example, depending on the sensitivity of the first coil 121, the amplitude of the actually measured induction signal may be different from the theoretical Q value depending on the embodiment. In this case, K _L can provide a signal processing process that is most optimized for the hardware characteristics of the actually manufactured first coil 121 by receiving parameters for adjusting the linearity of the output voltage V _OUT from outside and controlling the parameters of the modeling .

The signal processing method of the non-contact distance displacement sensor according to an embodiment of the present invention may be implemented in the form of a program command which can be executed through various computer means and recorded in a computer readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And various modifications and changes may be made thereto without departing from the scope of the present invention.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

Claims (14)

A signal processing method of a non-contact distance displacement sensor including a first coil and a second coil spaced apart from each other by a predetermined distance and a target metal plate,
Receiving a first voltage having an amplitude proportional to a Q-factor corresponding to a distance between the first coil and the target metal plate;
Receiving a second voltage having an amplitude independent of a distance between the second coil and the target metal plate; And
A modeling of the first voltage predetermined for a relationship between the Q-factor and the distance, a linear correlation of the distance between the first coil and the target metal plate based on the received first voltage and the second voltage The step of generating the output voltage
And a signal processing method of the non-contact distance displacement sensor. The method according to claim 1,
The step of generating the output voltage
Wherein the output voltage is generated by using a plurality of parameters determined by modeling of the first voltage and a ratiometric ratio of the first voltage and the second voltage to the output voltage of the contactless distance displacement sensor . 3. The method of claim 2,
The plurality of parameters
Wherein the non-contact distance displacement sensor is determined by information on the non-contact distance displacement sensor and modeling of the first voltage. The method according to claim 1,
The step of generating the output voltage
And the output voltage including a first parameter indicating a linear correlation between the distance between the first coil and the target metal plate and the Q-factor is generated. The method according to claim 1,
The step of receiving the second voltage
Wherein the output signal of the second coil regulated by the LC oscillator is received at the second voltage independent of the distance between the second coil and the target metal plate. The method according to claim 1,
The modeling of the first voltage
Wherein the first coil is modeling in inverse proportion to the square of the distance between the first coil and the target metal plate and modeling in inverse proportion to the distance between the first coil and the target metal plate.
A computer-readable recording medium having recorded thereon a program for executing the method according to any one of claims 1 to 6.
A target metal plate;
Moving means including a first coil and a second coil spaced apart at regular intervals; And
A first voltage of the first coil and a second voltage of the second coil in accordance with a distance between the moving means and the target metal plate, and wherein the received first voltage and the second voltage, and the Q- A signal processing unit for generating a third voltage having a linear correlation with a distance between the first coil and the target metal plate based on modeling of the first voltage predetermined on the relationship between the Q-factor and the distance,
/ RTI >
Wherein the first voltage has an amplitude proportional to the Q-factor with respect to the distance to the target metal plate, and the second voltage has an amplitude independent of a distance from the target metal plate. 9. The method of claim 8,
The signal processing unit
Generating the third voltage by using a plurality of parameters determined by modeling the first voltage and a ratiometric ratio of the first voltage and the second voltage to each other based on the generated third voltage, And calculates the distance between the target metal plate and the moving means. 10. The method of claim 9,
The plurality of parameters
Wherein the non-contact distance displacement sensor is determined by information on the non-contact distance displacement sensor and modeling of the first voltage. 10. The method of claim 9,
And a parameter adjuster for adjusting the plurality of parameters used for generating the third voltage based on the modeling of the first voltage,
Further comprising a signal processing unit for detecting the position of the non-contact distance displacement sensor. 9. The method of claim 8,
The signal processing unit
And the third voltage including a first parameter indicating a linear correlation between the distance between the first coil and the target metal plate and the Q-factor is generated. 9. The method of claim 8,
And a regulation section for regulating the output signal of the second coil to the second voltage by using the LC regulation.
Further comprising a signal processing unit for detecting the position of the non-contact distance displacement sensor. 9. The method of claim 8,
The modeling of the first voltage
Wherein the first coil is one of modeling in inverse proportion to the square of the distance between the first coil and the target metal plate or modeling in inverse proportion to the distance between the first coil and the target metal plate.

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