KR101799180B1 - Hybrid sensor, apparatus and method for inspecting inner defects and thickness comprising the same - Google Patents

Hybrid sensor, apparatus and method for inspecting inner defects and thickness comprising the same Download PDF

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KR101799180B1
KR101799180B1 KR1020160007173A KR20160007173A KR101799180B1 KR 101799180 B1 KR101799180 B1 KR 101799180B1 KR 1020160007173 A KR1020160007173 A KR 1020160007173A KR 20160007173 A KR20160007173 A KR 20160007173A KR 101799180 B1 KR101799180 B1 KR 101799180B1
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sensor
hybrid sensor
distance
pressure
measuring
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KR1020160007173A
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KR20170087326A (en
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정수헌
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국방기술품질원
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
    • G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B13/00—Measuring arrangements characterised by the use of fluids
    • G01B13/02—Measuring arrangements characterised by the use of fluids for measuring length, width or thickness
    • G01B13/06—Measuring arrangements characterised by the use of fluids for measuring length, width or thickness for measuring thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/222—Constructional or flow details for analysing fluids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/028—Material parameters
    • G01N2291/02854—Length, thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/028—Material parameters
    • G01N2291/0289—Internal structure, e.g. defects, grain size, texture

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  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
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  • General Health & Medical Sciences (AREA)
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  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

According to an aspect of the present invention, there is provided a hybrid sensor and an internal defect and thickness inspection apparatus including the hybrid sensor. In accordance with an aspect of the present invention, there is provided a hybrid sensor including a spray nozzle for spraying water serving as a path of an ultrasonic wave, An ultrasonic sensor for detecting an internal defect of the inspection object through ultrasonic waves, a pressure sensor for measuring the pressure of water sprayed from the spray nozzle, and a pressure sensor for applying a predetermined pre-pressure to the spray nozzle, There is provided a hybrid sensor including a preload device provided to vary the displacement in the direction of the preload and a displacement measurement sensor for measuring the displacement occurring in the preload device.

Description

Technical Field [0001] The present invention relates to a hybrid sensor, an internal defect including the same, and a thickness inspection apparatus and a method of inspecting the same.

TECHNICAL FIELD The present invention relates to a hybrid sensor, an internal defect and thickness inspection apparatus including the same, and an inspection method.

Recently, carbon fiber reinforced plastics (CFRP) have been widely applied to automobiles, aircrafts, and other transportation vehicles requiring high strength and high fuel consumption. The biggest disadvantage of carbon fiber composites is that they are expensive to produce and can be applied to a wider range of applications if the cost of production can be reduced. CFRP requires a quality assurance procedure to observe internal defects through non-destructive testing (NDT) after production and to make additional measurements to ensure that the external dimensions meet the required dimensions.

In particular, CFRP has the potential to contain defects such as porosity, void, and delamination during fabrication. In addition, since the uniformity of the thickness between the produced products is very low, it is necessary to grasp the dimensional satisfaction. Therefore, to insure the quality of the produced CFRP, internal defect inspection and external shape satisfaction inspection are required.

Currently, it is inevitable to separate CFRP internal / external defect inspection.

The present invention is a device for simultaneously measuring the thickness of a CFRP using a pressure of a jet fluid required for ultrasonic inspection, which is a representative method of nondestructive inspection, and is a hybrid sensor capable of simultaneously detecting / measuring internal defects and external shapes of CFRP And a method of inspecting thickness and inspecting method.

According to an aspect of the present invention, there is provided an inspection apparatus including: an injection nozzle for injecting water serving as a path of an ultrasonic wave to a surface of a test object; A pressure sensor for measuring the pressure of water jetted from the jetting nozzle, a pre-pressure device for applying a predetermined pre-pressure to the jetting nozzle, a pre-pressure device for varying the displacement in the longitudinal direction of the jetting nozzle, There is provided a hybrid sensor including a displacement measurement sensor for measuring a displacement occurring in a device.

According to still another aspect of the present invention, there is provided an internal defect and thickness inspection apparatus including a jig for mounting an inspection object, and a transfer unit for transferring the hybrid sensor and the hybrid sensor.

According to another aspect of the present invention, there is provided a method of measuring the thickness of a CFRP through an internal defect and thickness inspection apparatus, comprising the steps of: measuring a first distance (x 1 ) between a jig surface and a hybrid sensor; the difference between the step of using a module feeding the hybrid sensor as CFRP surface, measuring a second distance (x 2) between the CFRP surface and the hybrid sensor, and a first distance (x 1) and the second distance (x 2) And calculating a thickness of the CFRP through the first and second CFRPs.

INDUSTRIAL APPLICABILITY As described above, the hybrid sensor, the internal defect and thickness inspection apparatus and inspection method according to an embodiment of the present invention have the following effects.

It is a device that simultaneously measures the thickness of CFRP by using the pressure of jet fluid required for ultrasonic inspection, which is a representative method of nondestructive inspection. It simultaneously detects and measures internal defects of CFRP and external shape to improve quality assurance efficiency, The production time can be reduced.

It is also possible to reduce the production time by simultaneously performing the internal defect detection / external thickness measurement separately performed in terms of production.

In addition, it is possible to prevent the surface damage of the composite material by the non-contact method, and to prevent the surface of the hybrid sensor from colliding with the CFRP composite material even if a malfunction of the sensor transfer device occurs by providing a preload device.

1 is a conceptual diagram of a hybrid sensor according to an embodiment of the present invention.
FIGS. 2 to 4 are conceptual diagrams for explaining an operating state of the hybrid sensor according to an embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a hybrid sensor according to an embodiment of the present invention, an internal defect and thickness inspection apparatus and an inspection method including the same will be described in detail with reference to the accompanying drawings.

In addition, the same or corresponding reference numerals are given to the same or corresponding reference numerals regardless of the reference numerals, and redundant description thereof will be omitted. For convenience of explanation, the size and shape of each constituent member shown in the drawings are exaggerated or reduced .

FIG. 1 is a conceptual diagram of a hybrid sensor 100 according to an embodiment of the present invention, and FIGS. 2 to 4 are conceptual diagrams for explaining one operation state of the hybrid sensor 100 according to an embodiment of the present invention.

According to an aspect of the present invention, an internal defect and thickness measuring apparatus includes a jig 300 for mounting the inspection object 10, a hybrid sensor 100, and a transfer unit 200 for transferring the hybrid sensor . The present invention can be applied to various kinds of inspection bodies, for example, in this document, the inspection body 10 can be carbon fiber reinforced plastics (CFRP).

Referring to FIG. 1, the hybrid sensor 100 includes an injection nozzle 140, an ultrasonic sensor 110, a pressure sensor 120, a preload device 130, and a displacement measurement sensor 150. The hybrid sensor 100 is provided to measure the internal defect and the thickness of the inspection object. The internal defect of the inspection object 10 is measured by the ultrasonic sensor 110 as in the conventional method. The hybrid sensor 100 of the present document is capable of measuring the internal defect of the inspection object 10 through ultrasonic waves like the conventional sensors and further measuring the thickness t of the inspection object 10 .

Specifically, when the hybrid sensor 100 is sprayed with water from the spray nozzle 140 and the spray nozzle 140 for spraying water serving as a path of an ultrasonic wave to the surface of the inspection object 10, And an ultrasonic sensor 110 for detecting internal defects. Specifically, the ultrasonic inspection can detect the internal defect by spraying the water which is the path of the ultrasonic wave on the surface of the inspection object, and analyzing the signal returned to the ultrasonic sensor.

The hybrid sensor 100 includes a pressure sensor 120 for measuring the pressure of water sprayed from the spray nozzle 140 and a pressure sensor 120 for applying a predetermined preload to the spray nozzle 140, A preload device 130 provided to vary the displacement in the longitudinal direction (x-axis direction) of the injection nozzle 140, and a displacement measurement sensor 150 for measuring the displacement generated in the preload device 130.

The displacement measurement sensor 150 can be configured by various methods such as a strain gauge or an LVDT capable of measuring a displacement generated in the preload device 130.

The preload device 130 includes a spring 131 or a pneumatic device. Accordingly, it is possible to apply a predetermined pressure to the injection nozzle 140 in advance. 1, the injection nozzle 140 is connected to the preload device 130 via a spring 131, and the injection nozzle 140 is installed to be slidable along the longitudinal direction of the hybrid sensor 100 .

At this time, the injection nozzle 140 is connected to the pre-pressurization device 130 and is provided to stop at a point where the water pressure of the water sprayed from the injection nozzle 140 and the pre-pressure are balanced. 2, the injection nozzle 140 is connected to the pre-pressurizing device 130. When the pressure of the water jetted from the injection nozzle 140 becomes a certain level or more, the injection nozzle 140 is connected to the pre- 130) (the spring is compressed), and then stops at a point where the water pressure and the preload are balanced. According to this structure, the length of the hybrid sensor 100 depends on the amount of displacement of the preload device 130. That is, at the point where the water pressure and the preload are balanced, the length (s 0 ) of the hybrid sensor 100 is reduced as compared with the initial length (s 1 ) of the unactuated state by the compressed length of the spring.

Referring to FIGS. 2 to 4, a first distance (x 1 ) between the surface of the jig 300 and the hybrid sensor can be measured through the hybrid sensor 100. 2, after the hybrid sensor 100 is moved from the initial position to the jig surface 300 (in the x-axis direction in FIG. 3) and the water pressure and the preload are balanced, the hybrid sensor 100 The first distance can be measured based on the positional change (displacement) of the preload device and the displacement generated in the preload device.

On the other hand, the pressure of the water jetted from the jetting nozzle 140 increases when the distance between the jetting nozzle 140 and the surface of the jig 300 becomes 1/4 or less of the diameter of the jetting nozzle 140. Therefore, by making the water pressure of the jet nozzle and the preload of the pre-pressurizing device at a point where the distance d 1 between the surface of the jig 300 and the jetting nozzle becomes 1/4 or less of the jetting nozzle diameter D, The resulting displacement is measured.

Referring to FIG. 4, the first distance (x 1 ) can be calculated by the following general formula ( 1 ).

[Formula 1]

Figure 112016006641514-pat00001

In the general formula (1), l 1 is a positional change amount of the hybrid sensor 100, and indicates an interval between the initial position and a position where the water pressure and the preload are in balance, s 0 is an initial length (inoperative state) of the hybrid sensor, s 1 is the length variation of the hybrid sensor (jig surface and the hybrid sensor state between distance is achieved by the pressure balance in the first or lower position and a preload of the injection nozzle diameter), d is the diameter of the injection nozzle, d 1 is a hybrid sensor And the surface of the jig.

3) between the surface of the inspection object 10 and the hybrid sensor 100 after the hybrid sensor is transferred to the surface of the inspection object 10 through the transfer module 200 2 ) can be measured.

Referring to FIGS. 2 to 4, a second distance (x 2 ) between the surface of the inspection object 10 (CFRP) and the hybrid sensor 100 can be measured through the hybrid sensor 100. 3 and 4, the hybrid sensor 100 is moved from the initial position to the inspection object surface 10 (in the x-axis direction in FIG. 3) so that the hydraulic pressure and the preload are balanced, The second distance can be measured based on the positional change (displacement) of the hybrid sensor 100 and the displacement occurring in the preload device.

On the other hand, the pressure of the water jetted from the jetting nozzle 140 increases when the distance between the jetting nozzle 140 and the surface of the inspection target 10 becomes 1/4 or less of the diameter of the jetting nozzle 140. Therefore, by making the water pressure of the injection nozzle and the preload of the pre-pressurizing device at a point where the distance d 2 between the surface of the inspection object 10 and the injection nozzle 140 becomes 1/4 or less of the diameter of the injection nozzle, Displacement is measured

Referring to FIG. 4, the second distance (x 2 ) can be calculated by the general formula ( 2 ).

[Formula 2]

Figure 112016006641514-pat00002

In the general formula (2), l 2 is the amount of change in the position of the hybrid sensor 100, and indicates the interval between the initial position and the position where the water pressure and the preload are in equilibrium, s 0 is the initial length of the hybrid sensor s 2 is the length variation of the hybrid sensor (test sensor body surface and the hybrid state between distance is achieved by the pressure and balance the preload in the first or lower position of the injection nozzle diameter), D is the diameter of the injection nozzle, d 2 is a hybrid The distance between the sensor and the surface of the test object.

Further, the thickness t of the inspection object is calculated through the difference between the first distance (x 1 ) and the second distance (x 2 ). The thickness t of the inspection object 10 can be expressed by the following general formula (3).

[Formula 3]

Figure 112016006641514-pat00003

The conveying unit may include a conveying unit capable of conveying the hybrid sensor in three axes and a measuring unit for measuring the position of the hybrid sensor.

Particularly, as shown in Figs. 2 and 3, when the thickness of a test object (for example, CFRP) having a large step-like step structure on its surface is measured, By measuring the distances individually, the thickness of the inspection object in a specific area can be continuously measured.

The present invention provides a method for measuring the thickness of CFRP through an internal defect and thickness inspection apparatus having the above structure.

The internal defect and thickness inspection method includes the steps of measuring a first distance (x 1 ) between the jig surface and the hybrid sensor through the internal defect and thickness inspection apparatus, transferring the hybrid sensor to the CFRP surface through the transfer module, Measuring the second distance (x 2 ) between the CFRP surface and the hybrid sensor and calculating the thickness of the CFRP through the difference between the first distance (x 1 ) and the second distance (x 2 ).

The foregoing description of the preferred embodiments of the present invention has been presented for purposes of illustration and various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention, And additions should be considered as falling within the scope of the following claims.

10: CFRP (inspector)
100: Hybrid sensor
110: Ultrasonic sensor
120: Pressure sensor
130: Preload device
140: injection nozzle
150: displacement measurement sensor
200: transfer unit
300: jig

Claims (10)

A spray nozzle for spraying water to be a path of an ultrasonic wave to the surface of the inspection object;
An ultrasonic sensor for detecting an internal defect of the inspection object through ultrasonic waves when water is injected from the injection nozzle;
A pressure sensor for measuring the pressure of water sprayed from the spray nozzle;
A preload device which is provided to apply a predetermined preload to the injection nozzle and whose displacement varies in the longitudinal direction of the injection nozzle; And
And a displacement measurement sensor for measuring a displacement occurring in the preload device,
Wherein the inspecting body is carbon fiber reinforced plastics (CFRP). The method according to claim 1,
The injection nozzle is connected to the pre-pressurizing device and is arranged to stop at a point where the water pressure of the water sprayed from the spray nozzle and the pre-pressure balance. 3. The method of claim 2,
The pre-pressure device includes a spring or a pneumatic device. delete A jig for mounting the inspection object;
An ultrasonic sensor for detecting an internal defect of the inspection object through ultrasonic waves when the water is jetted from the jet nozzle, a pressure sensor for measuring the pressure of the water jetted from the jet nozzle, A hybrid sensor including a pressure sensor for applying a predetermined preload to the injection nozzle, a pre-pressure device provided for varying the displacement in the longitudinal direction of the injection nozzle, and a displacement measurement sensor for measuring the displacement generated in the pre-pressure device; And
And a transfer unit for transferring the hybrid sensor,
Wherein the inspecting body is carbon fiber reinforced plastics (CFRP). 6. The method of claim 5,
The first distance (x 1 ) between the jig surface and the hybrid sensor is measured, the hybrid sensor is transferred to the inspection object surface through the transfer module, and then the second distance (x 2 ) between the inspection object surface and the hybrid sensor is measured And the thickness of the inspection object is calculated through the difference between the first distance (x 1 ) and the second distance (x 2 ). The method according to claim 6,
The water pressure of the injection nozzle and the preload of the preload device are balanced at a point where the distance between the surface of the inspection object and the injection nozzle becomes 1/4 or less of the diameter of the injection nozzle, . The method according to claim 6,
Wherein the first distance (x 1 ) is calculated by the general formula ( 1 ), and the second distance (x 2 ) is calculated by the general formula ( 2 )
[Formula 1]
Figure 112016006641514-pat00004

[Formula 2]
Figure 112016006641514-pat00005

Between the polymer of the general formula 1, l 1 is the location variation of the hybrid sensor, s 0 is the initial length, △ s 1 of the hybrid sensor is a length variation of the hybrid sensor, D is the diameter of the injection nozzle, d 1 is the hybrid sensor, and a jig surface Distance,
In the formula 2, l 2 is the location variation of the hybrid sensor, s 0 is the initial length of the hybrid sensor, △ s 2 is the length variation of the hybrid sensor, D is the diameter of the injection nozzle, d 2 is between the hybrid sensor and the test body surface . 6. The method of claim 5,
Wherein the conveying unit includes a conveying unit capable of conveying the hybrid sensor in three axes and a measuring unit for measuring a position of the hybrid sensor. A method for measuring the thickness of a CFRP through an internal defect and thickness inspection apparatus according to claim 5,
Measuring a first distance (x 1 ) between the jig surface and the hybrid sensor;
Transferring the hybrid sensor to a CFRP surface via a transfer module;
Measuring a second distance (x 2 ) between the CFRP surface and the hybrid sensor; And
And calculating the thickness of the CFRP through the difference between the first distance (x 1 ) and the second distance (x 2 ).
KR1020160007173A 2016-01-20 2016-01-20 Hybrid sensor, apparatus and method for inspecting inner defects and thickness comprising the same KR101799180B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4696895B2 (en) * 2005-12-20 2011-06-08 Ｊｆｅスチール株式会社 Water column type ultrasonic flaw detector and water column type ultrasonic flaw detection method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4696895B2 (en) * 2005-12-20 2011-06-08 Ｊｆｅスチール株式会社 Water column type ultrasonic flaw detector and water column type ultrasonic flaw detection method

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