KR101963100B1 - Method for diagnosing measurement data of optic sensor - Google Patents

Abstract

The present invention relates to a method of diagnosing measurement data of an optical fiber sensor, comprising the steps of receiving a plurality of measurement data measured by a plurality of optical fiber sensors, checking whether there is error data in a plurality of measurement data, The data diagnosis unit detects the error data and corrects the measurement data by deleting the detected error data. According to the present invention, a plurality of measurement data are obtained from one optical fiber sensor by the influence of the surrounding environment The generated error data can be detected and removed. Therefore, the reliability of the measurement data can be secured, and the reliability of the status monitoring and diagnosis of the apparatus equipped with the optical fiber sensor such as the wind turbine can be improved.

Description

METHOD FOR DIAGNOSING MEASUREMENT DATA OF OPTIC SENSOR [0002]

The present invention relates to a method of diagnosing measurement data of an optical fiber sensor, and more particularly, to a method of diagnosing measurement data of an optical fiber sensor by correcting an error that a plurality of measurement data is generated in one optical fiber sensor And a method of diagnosing measurement data of an optical fiber sensor.

Unlike general sensors, fiber optic sensors actively monitor the condition of wind turbines due to their low number of channels required for data measurement and robustness against lightning and electrical shorts and the ability to acquire multiple measurement data from one channel.

Particularly, the blade is exposed to various environments and the status monitoring and the integrity evaluation system using the optical fiber sensor are being actively developed due to the rotation characteristic during operation.

However, since the optical fiber sensor is sensitive to the surrounding environment such as temperature, if the optical fiber sensor can not be uniformly installed on the curved surface of the blade, a plurality of peak values are generated in one optical fiber sensor, and a plurality of measurement data can be generated.

For example, when two peak values are shown in one optical fiber sensor as shown in FIG. 1, if the threshold value is set to A, then one peak value is detected. However, if the threshold value is set to B, Value is detected and two measurement data are generated.

When two measurement data are generated from one optical fiber sensor, measurement data is sequentially received from a plurality of optical fiber sensors and status monitoring of a wind turbine or the like is performed. In this case, measurement data is pushed one by one, There is a problem.

A related prior art is Korean Patent Publication No. 2003-0048817 (published on Jun. 25, 2003, entitled " Sensing System Using Optical Fiber ").

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems and provides a method of diagnosing measurement data of an optical fiber sensor that ensures accurate status monitoring of a device equipped with an optical fiber sensor such as a wind turbine by securing reliability of optical fiber sensor measurement data It has its purpose.

According to an aspect of the present invention, there is provided a method of diagnosing measurement data of an optical fiber sensor, comprising: receiving a plurality of measurement data measured by a plurality of optical fiber sensors; Checking whether there is error data in the plurality of measurement data; Detecting the error data by the data diagnosis unit when the error data is present; And correcting the measurement data by deleting the error data detected by the data diagnosis unit.

In the step of receiving the plurality of measurement data of the present invention, the measurement data is stored in a table form according to the channel of the optical fiber sensor and the measurement time.

In the step of checking whether the error data of the present invention exists, the data diagnosis unit compares the number of measurement data with a reference value, and determines that the error data exists if the number of measured data exceeds the reference value .

In the present invention, the reference value is a value corresponding to the number of the optical fiber sensors.

In the error data detection step of the present invention, the data diagnosis unit sequentially compares the plurality of measurement data with the reference table, and detects the measurement data whose difference from the reference table exceeds the set value as the error data .

In the present invention, the reference table includes values corresponding to fundamental wavelengths that are set so that each of the optical fiber sensors is basically reflected.

In the present invention, the reference table may be formed of measurement data that is determined that the error data does not exist as a result of the inspection.

In the step of correcting the measurement data of the present invention, the data diagnosis unit rearranges the measurement data sequentially by deleting the error data.

The present invention is further characterized in that the data diagnosis unit sequentially compares the re-ordered measurement data with a reference table to perform re-verification.

According to the present invention, even when a plurality of measurement data is generated by one optical fiber sensor due to the influence of the surrounding environment such as a temperature change, the generated error data can be detected and removed, have.

As described above, according to the present invention, the reliability of the measurement data can be ensured, so that the reliability of the status monitoring and diagnosis of the apparatus provided with the optical fiber sensor, such as a wind turbine, can be improved.

FIG. 1 is a view for explaining a case where a plurality of measurement data is generated in one optical fiber sensor.
2 is a block diagram showing the configuration of a measurement data diagnosis apparatus for an optical fiber sensor according to an embodiment of the present invention.
3 is a flowchart illustrating an operation flow of a method of diagnosing measurement data of an optical fiber sensor according to an embodiment of the present invention.
FIG. 4 is a graph showing simulation results using a measurement data diagnosis method of an optical fiber sensor according to an embodiment of the present invention.

Hereinafter, a method of diagnosing measurement data of an optical fiber sensor according to the present invention will be described in detail with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

2 is a block diagram showing the configuration of a measurement data diagnosis apparatus for an optical fiber sensor according to an embodiment of the present invention.

2, an apparatus for measuring data of an optical fiber sensor according to an exemplary embodiment of the present invention includes an optical fiber sensor unit 10, an optical wavelength measurement unit 20, a data diagnosis unit 30, a reference value generator 40, a memory unit 50, a diagnostic information output unit 60, and a data processing unit 70.

The optical fiber sensor unit 10 includes a plurality of WDM (wavelength division multiplexing) optical fiber sensors. Each optical fiber sensor reflects a laser beam emitted from a light source (not shown) to a specific wavelength, .

The optical wavelength measuring unit 20 measures wavelengths reflected from the optical fiber sensor unit 10 to generate a plurality of measurement data and transmits the measurement data to the data diagnosis unit 30.

At this time, the optical wavelength measuring unit 20 may generate measurement data for each measurement period. The measurement period may be variously selected according to the designer's intention and the specification of the optical fiber sensor and the optical wavelength measuring unit 20. For example, the optical wavelength measuring unit 20 can generate measurement data every 0.01 [sec] (i.e., at 100 [Hz]) and transmit it to the data diagnosis unit 30. [

The data diagnosis unit 30 checks whether there is error data in a plurality of measurement data input from the optical wavelength measurement unit 20. [

At this time, the data diagnosis unit 30 sequentially stores a plurality of measurement data, which are input every measurement period, in the memory unit 50. When a preset diagnostic period comes, the reference value and reference And diagnoses and corrects the measurement data using the table.

Specifically, the data diagnosis unit 30 checks whether error data exists in the measurement data, detects and deletes error data when there is error data, and performs correction by rearranging measurement data.

A detailed process of diagnosing and correcting the measurement data by the data diagnosis unit 30 will be described later with reference to FIG.

The reference value generator 40 generates a reference value and a reference table and provides the reference value and the reference table to the data diagnosis unit 30.

Here, the reference value indicates a value to be referred to when error data exists in a plurality of measurement data, and the reference table means values to be referred to when detecting error data among a plurality of measurement data.

That is, the data diagnosis unit 30 checks whether there is error data in the measurement data with reference to the reference value, and when there is error data as a result of the inspection, the data diagnosis unit 30 refers to the reference table and detects error data.

A specific process of generating the reference value and the reference table by the reference value generator 40 will also be described later with reference to FIG.

A plurality of measurement data sequentially input from the optical wavelength measuring unit 20 to the data diagnosis unit 30 are stored in the memory unit 50 in the form of a table according to the channel of the optical fiber sensor and the measurement time.

For example, when the optical fiber sensor unit 10 is provided with 10 optical fiber sensors and measurement data is generated every 0.01 [sec], according to the channel (ch) of the optical fiber sensor and the measurement time (s) The measurement data can be stored.

s \ ch One 2 3 4 5 6 7 8 9 10 0.01 1520 1532 1544 1568 1572 1576 1520 1532 1544 1569 0.02 1520 1532 1544 1568 1572 1576 1520 1532 1544 1569 0.03 1520 1532 1544 1568 1572 1576 1520 1532 1544 1569 0.04 1520 1532 1544 1568 1572 1576 1520 1532 1544 1569 0.05 1520 1532 1544 1568 1572 1576 1520 1532 1544 1569 0.06 1520 1532 1544 1568 1572 1576 1520 1532 1544 1569 0.07 1520 1532 1544 1568 1572 1576 1520 1532 1544 1569 0.08 1520 1532 1544 1568 1572 1576 1520 1532 1544 1569 : : : : : : : : : : :

The diagnostic information output unit (60) outputs diagnostic information by the data diagnosis unit (30).

Here, the diagnostic information is information on the diagnosis result, and may include whether there is error data and information on the error data correction result.

The data processing unit 70 receives measurement data that has been diagnosed from the data diagnosis unit 30 and converts the measurement data into physical data.

If the optical fiber sensor is configured to measure the strain of the wind turbine blade, the data processing unit 70 may convert the measurement data into data on strain.

The physical data converted by the data processing unit 70 may be provided to a system for monitoring the state of a facility or an apparatus equipped with an optical fiber sensor such as a wind turbine.

For example, when the optical fiber sensor is configured to measure the strain of the wind turbine blade, information on the strain transformed by the data processing section 70 can be utilized for monitoring the condition of the wind turbine blade.

3 is a flowchart illustrating an operation flow of a method of diagnosing measurement data of an optical fiber sensor according to an embodiment of the present invention.

Hereinafter, a process of diagnosing measurement data by the data diagnosis unit 30 and detecting and deleting error data to correct measurement data will be described in detail with reference to FIG.

As shown in FIG. 3, the data diagnosis unit 30 receives a plurality of measurement data measured by a plurality of optical fiber sensors from the optical wavelength measurement unit 20 (S100). At this time, a plurality of measurement data may be input to the data diagnosis unit 30 every measurement period.

When the measurement data is input as described above, the data diagnosis unit 30 determines whether a diagnosis cycle has arrived (S110).

Here, the diagnosis period refers to a period during which the diagnosis and correction of the measurement data is performed by the data diagnosis unit 30 and can be variously selected according to the intention of the designer, the specification of the optical fiber sensor, have.

Performing the diagnosis and correction each time measurement data is input guarantees the highest reliability. However, since the diagnosis cycle is too short, it is preferable that the diagnosis cycle is selected to an appropriate value because of overhead.

For example, when the measurement period is 0.01 [sec], the diagnosis period can be set to a value of several seconds to several minutes.

If the diagnosis period has not arrived, the data diagnosis unit 30 sequentially stores the measurement data in the memory unit 50 (S120), returns to the step of receiving the measurement data (S100) The measurement data is repeatedly input.

On the other hand, when the diagnostic period comes, the data diagnosis unit 30 performs the diagnosis of the measurement data stored in the memory unit 50 during the diagnosis period.

For convenience of explanation, it is assumed that measurement data stored in the memory unit 50 is as shown in Table 2 below when the measurement cycle is 0.01 [sec] and the optical fiber sensor is 10.

One 2 3 4 5 6 7 8 9 10 0.01 1520 1532 1544 1565 1572 1576 1520 1522 1532 1544 1569 0.02 1520 1532 1544 1568 1572 1576 1520 1532 1544 1569 0.03 1520 1532 1544 1568 1572 1576 1520 1532 1544 1569 0.04 1520 1532 1544 1568 1572 1576 1520 1532 1544 1569 0.05 1520 1532 1544 1568 1572 1576 1520 1522 1532 1544 1569 0.06 1520 1532 1544 1568 1572 1576 1520 1532 1544 1569 0.07 1520 1532 1544 1568 1572 1576 1520 1522 1532 1544 1569 0.08 1520 1532 1544 1568 1572 1576 1520 1532 1544 1569 : : : : : : : : : : :

Specifically, the data diagnosis unit 30 compares the number of measurement data for each measurement time with a reference value provided from the reference value generation unit 40 to check whether the number of measurement data matches the reference value (S130). At this time, the reference value may be a value corresponding to the number of optical fiber sensors provided in the optical fiber sensor unit 10 (i.e., the number of channels of the optical fiber sensor).

In other words, the data diagnosis unit 30 determines whether or not the number of measurement data for each measurement time coincides with the number of optical fiber sensors.

Referring to Table 2, for example, the data diagnosis unit 30 can determine whether the number of measurement data measured at intervals of 0.01 [sec] is '10' corresponding to the number of optical fiber sensors.

The reference value corresponding to the number of the optical fiber sensors is provided from the reference value generator 40. The reference value generator 40 may generate the reference value by various methods.

First, when the information about the number of optical fiber sensors provided in the optical fiber sensor unit 10 is known or set, the reference value generator 40 may generate the reference value and provide the reference value to the data diagnosis unit 30 have.

For example, if the information that the number of the optical fiber sensors provided in the blades of the wind turbine is known in advance, the reference value generator 40 generates '10' as a reference value and provides the data to the data diagnosis unit 30 .

Secondly, when the information about the number of optical fiber sensors is not known, the reference value generator 40 adds up the number of measurement data for each measurement time, divides the number of measurement data by each number of measurement data per channel, .

Referring to Table 2, when the number of measurement data for each measurement time from 0.01 [sec] to 0.08 [sec] is summed and divided by the number of measurement data per channel, It is generated as '10' by the formula.

Thirdly, the reference value generator 40 may generate a minimum value among the number of measurement data for each time as a reference value. Taking Table 2 as an example, the reference value (a) is generated as '10' by the following equation.

According to the second and third methods, an accurate reference value is generated even if the number of optical fiber sensors is not known unless error data is generated in all measurement times because an optical fiber sensor is used only when the number of measured data increases. .

As a result of comparing the number of measurement data for each measurement time with the reference value, if there is no error data when the number of measurement data of all the measurement times coincides with the reference value, the data diagnosis unit 30 transmits the measurement data to the data processing unit 70 (S170).

However, if the number of measurement data for at least one measurement time exceeds the reference value, error data is present. Therefore, the data diagnosis unit 30 uses the reference table provided from the reference value generation unit 40 to calculate error data (S140).

That is, since the number of measurement data measured at 0.01 [sec], 0.05 [sec], and 0.07 [sec] in Table 2 exceeds '10' by '11', the data diagnosis unit 30 And detects error data from the data.

At this time, the data diagnosis unit 30 sequentially compares the measurement data of the measurement time at which the error data exists with the reference table, and can detect the measurement data whose difference from the reference table value is equal to or higher than the set value, as the error data.

Here, the reference table is a value to be compared with the measurement data of the measurement time in which the error data exist for detecting the error data. For example, the reference table may be as shown in Table 3 below.

1520 1532 1544 1568 1572 1576 1520 1532 1544 1569

When the measured data measured at 0.01 [sec], 0.05 [sec], and 0.07 [sec], which are determined to have error data in Table 2, are sequentially compared with the reference table of Table 3, Can not be matched with the value '1532' on the reference table.

Therefore, the data diagnosis unit 30 can detect the value of the eighth channel measured at 0.01 [sec], 0.05 [sec], and 0.07 [sec] as error data.

On the other hand, the reference table can be generated by the reference value generator 40 in various ways like the above-described reference values.

First, when the reference value generator 40 knows information about the basic wavelength set to be reflected by each optical fiber sensor, it is possible to generate the reference table as described above and provide the reference table to the data diagnosis unit 30 have.

Secondly, when the information about the fundamental wavelength of the optical fiber sensor is not known, the reference value generator 40 may generate the reference table from the measurement data of the measurement time in which the error data does not exist.

Taking the example of Table 2 as an example, the reference value generation unit 40 measures the measured values at 0.02 [sec], 0.03 [sec], 0.04 [sec], 0.06 [sec], and 0.08 [sec] Data to the data diagnosis unit 30. The data diagnosis unit 30 may be configured to generate the reference table from the data.

Since the measurement data of the optical fiber sensor are sequentially measured at a relatively short measurement period, there is no sudden change in the measured value. Therefore, even with this method, accurate reference table information can be generated.

After detecting the error data, the data diagnosis unit 30 deletes the detected error data and rearranges the measurement data to correct the measurement data (S150).

At this time, the data diagnosis unit 30 can rearrange the measurement data by sequentially shifting the measurement data after deleting the detected error data.

Referring to Table 2, the data diagnosis unit 30 deletes the value '1522' of the eighth channel measured at 0.01 [sec], 0.05 [sec] and 0.07 [sec] Can be performed.

Since the measurement data of the optical fiber sensor are sequentially inputted in order of the channel, if the error data is deleted and the measurement data of the next channel is shifted, the error of the measurement data is corrected.

However, for more reliable verification, the data diagnosis unit 30 may compare the re-arranged measurement data with the reference table again to check whether the measurement data is correctly corrected.

On the other hand, after completing the correction of the measurement data, the data diagnosis unit 30 outputs diagnostic information through the diagnostic information output unit 60 (S160), and transmits the corrected measurement data to the data processing unit 70 ( S170).

Then, the data processing unit 70 converts the measurement data into physical data.

As described above, according to the measurement data diagnosis method of the optical fiber sensor according to the present invention, even when a plurality of measurement data is generated in one optical fiber sensor due to the influence of the surrounding environment such as temperature change, The reliability of the measurement data can be ensured.

Therefore, the reliability of the status monitoring and diagnosis of the apparatus equipped with the optical fiber sensor such as the wind turbine can be improved.

FIG. 4 is a graph showing simulation results using a measurement data diagnosis method of an optical fiber sensor according to an embodiment of the present invention. Fig. 4 (a) shows the change of measurement data when the present invention is not applied, and Fig. 4 (b) shows the change of measurement data when the present invention is applied.

Referring to FIG. 4, in FIG. 4A, the error data is calculated and the measured data increases to -8000. However, in FIG. 4B where the present invention is applied, It is possible to confirm that the normal measurement data is changed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. Accordingly, the technical scope of the present invention should be defined by the following claims.

10: Optical fiber sensor part
20: Optical wavelength measuring unit
30: Data diagnosis section
40: Reference value generator
50:
60: Diagnostic information output section
70:

Claims (9)

Receiving a plurality of measurement data measured by a plurality of optical fiber sensors by a data diagnosis unit;
Checking whether there is error data in the plurality of measurement data;
Detecting the error data by the data diagnosis unit when the error data is present; And
And correcting the measurement data by deleting the error data detected by the data diagnosis unit,
In the step of correcting the measurement data,
Wherein the data diagnosis unit rearranges the measurement data by sequentially shifting the measurement data after erasing the error data.
The method of claim 1, wherein the step of receiving the plurality of measurement data
Wherein the measurement data is stored in a table form according to a channel of the optical fiber sensor and measurement time.
2. The method of claim 1, further comprising:
Wherein the data diagnosis unit compares the number of measurement data with a reference value and determines that the error data exists if the number of measurement data exceeds the reference value.
The method of claim 3, wherein the reference value is a value corresponding to the number of the optical fiber sensors.
2. The method of claim 1, wherein, in the step of detecting the error data
Wherein the data diagnosis unit sequentially compares the plurality of measurement data with the reference table and detects measurement data whose difference from the reference table value exceeds a set value as the error data. .
[6] The method of claim 5, wherein the reference table comprises values corresponding to basic wavelengths that are respectively set to be reflected by the optical fiber sensors.
[6] The method of claim 5, wherein the reference table comprises measurement data determined as no error data.
delete The method according to claim 1,
Further comprising the step of sequentially re-comparing the measurement data rearranged with the reference table by the data diagnosis unit to perform re-verification.

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