KR101558922B1 - Dual type ultrasonic sensor for adjusting beam width - Google Patents

Abstract

The present invention relates to a split type ultrasonic sensor capable of adjusting a beam size, and is a split type ultrasonic sensor including a sound dividing surface, a piezoelectric vibrator and a geomembrane. The transmission delay material is a junction between a first transmission ground member and a second transmission ground member And the side end face of the face is convexly curved downward and the side end face of the bonding face between the first receiving region and the second receiving region is curved downwardly convexly . Therefore, since the beam width can be adjusted for the same ultrasonic wave radiation plane, the number of ultrasonic sensors can be reduced in automatic inspection of a large area metal, thereby reducing the cost of the entire system and reducing the operating cost. to provide.

Ultrasonic sensor, piezoelectric vibrator, geomagnetic material, sound dividing surface

Description

[0001] The present invention relates to a dual type ultrasonic sensor for adjusting beam width,

The present invention relates to a split type ultrasonic sensor capable of adjusting a beam size, and more particularly, to a split type ultrasonic sensor capable of adjusting a beam size while having the same ultrasonic wave radiation plane.

In recent years, non-destructive ultrasonic sensors have been attracting attention as a device for diagnosing and predicting the stability of facility structures. This is not a diagnosis of the mechanical characteristics of the structure and diagnosis of the structure by the destructive test as in the past, but the ultrasonic diagnosis is used to diagnose the properties and diagnose the operation state nondestructively. It is possible to prevent the sudden destruction of the machinery, so that it is possible to prevent a large facility and a job loss.

In addition, the non-destructive ultrasonic sensor can easily be installed in a complex structure which was difficult to diagnose in the past, and has an advantage of obtaining excellent diagnostic effect at a much lower cost than other methods.

On the other hand, there are various kinds of ultrasonic sensors, but a divided sensor is most commonly used for quality inspection in an industrial field. This is a form in which two piezoelectric transducers are contained in one enclosure so that the transmission and reception of ultrasonic waves can be performed as a single sensor.

However, such a splittable sensor is advantageous in terms of ease of use and removal of noise due to a combination of transmission and reception signals, but it has a serious drawback that the operating frequency band is narrow. In order to accurately detect the minute internal defects in the nondestructive inspection, it is usual that the bandwidth of the conventional split type ultrasonic sensor does not exceed 50%, although it is advantageous that the frequency band used is wide.

In order to solve such a problem, a conventional split type ultrasonic sensor has been disclosed in the Utility Model Registration Publication No. 1997-0006841 (July 8, 1997) of the present applicant. In this conventional split type ultrasonic sensor, The ultrasonic sensor has a structure in which a transmitter that emits an ultrasonic wave and a receiver that receives an ultrasonic signal reflected from an object to be detected are combined and a plurality of matching layers are formed to expand the operating frequency band.

At this time, the transmitter and the receiver are tilted at a predetermined angle in order to focus the ultrasonic beam radiated from the transmitter to a predetermined depth. The sensitivity characteristic according to the depth of the ultrasonic beam is determined by the angle.

However, there is a method of controlling the size of the ultrasonic beam in a direction perpendicular to the direction of the ultrasonic beam. However, most ultrasonic sensors can not infinitely extend the radiation plane, so that the size of the ultrasonic beam is determined when the ultrasonic radiation plane is determined.

1 and 2 are a structural view and a side view showing a conventional split type ultrasonic sensor. As shown in Fig. 1, a ground electrode 1, a sound dividing surface 2, a wire 3, 4, a conventional ultrasonic transducer having a piezoelectric transducer 5 having a transmitter and a receiver can control the ultrasonic sensitivity to the depth direction by adjusting the angles of the transmitter and the receiver. However, There is a problem that the size can not be adjusted.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above conventional problems and it is an object of the present invention to reduce the number of ultrasonic sensors in automatic inspection of a large area metal, It is another object of the present invention to provide a split type ultrasonic sensor capable of reducing the operating cost and measuring a wider range than that of the conventional ultrasonic sensor and capable of adjusting the beam size so as to improve the efficiency of the ultrasonic inspection. The purpose.

In order to achieve the above object, the present invention provides a piezoelectric transducer comprising: a piezoelectric transducer having an acoustically divided surface vertically formed at the center, a transmitter formed at one side of the acoustically segmented surface, and a receiver formed obliquely to the other of the acoustically- The transmission type delay element includes a first transmission ground member, a first transmission ground member, and a second transmission ground member. The transmission delay member includes a transmission ground member formed on a lower portion of the transmission member and a ground member having a reception member extension formed on a lower portion of the receiver. And a second transmission grounding member, wherein the receiving grounding member comprises a first receiving grounded member and a second receiving landed member joined to a lower face thereof, the first transmitting grounded member and the second transmitting grounded member, The joining surface has a side end surface curved downwardly convexly, and the joining surface between the first and second receiving ridges is convex downward Songs are formed.

By varying the curvature of the bonding surface of the present invention, the difference in delay time between the first transmission ground member and the second transmission ground member, and the difference in delay speed between the first and the second reception creep member, Adjust the beam size.

As described above, according to the present invention, since the beam width can be adjusted with respect to the same ultrasonic wave emitting surface, the number of ultrasonic sensors can be reduced in automatic inspection of a large area metal, It is possible to reduce the size of the image.

Further, it is possible to measure a wider range than that of the conventional ultrasonic sensor, thereby providing an effect of improving the efficiency of ultrasonic inspection.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a view showing a split type ultrasonic sensor capable of adjusting a beam size according to an embodiment of the present invention, and FIG. 4 is a side view showing a split type ultrasonic sensor capable of adjusting a beam size according to an embodiment of the present invention .

As shown in FIGS. 3 and 4, the split type ultrasonic sensor capable of adjusting the depth of focus of the present embodiment includes a geomorphic member, a sound dividing surface 20, and a piezoelectric vibrator 50, The material 40, and the bonding material 60 are the same as those known in the prior art, and it is needless to say that they may be further included.

The retarder is formed at the lower portion of the piezoelectric transducer 50 and is used for eliminating the dead band in the split type ultrasonic sensor, and a plurality of geometries for adjusting the size of the ultrasonic beam are formed by adjusting the beam width in the longitudinal direction .

That is, the delay material has a transmission grounding member 11 formed on one lower side of the piezoelectric vibrator 50 and a receiving grounding member 12 formed on the other lower side of the piezoelectric vibrating member 50. An acrylic resin, alumina, polystyrene, or the like can be used as the material of the geomagnetism.

The transmission ground member 11 includes a first transmission ground member 11a, a second transmission ground member 11b bonded to the lower surface thereof, and a joint surface 11c therebetween. The joining face 11c between the first transmission support member 11a and the second transmission support member 11b is formed such that its side end face is convexly curved downward. It is also possible that the positive cross section is formed in an arc shape.

The receiving land steeple 12 comprises a first receiving land steeple 12a, a second receiving land steeple 12b bonded to its lower face, and a mating face 12c therebetween. The joining face 12c between the first receiving region 12a and the second receiving region 12b has a side end face curved downwardly convexly. It is also possible that the positive cross section is formed in an arc shape.

Therefore, as shown in FIG. 4, the ultrasonic beam is refracted by the joint surfaces 11c and 12c of the respective geomagnetism members to expand the width of the ultrasonic beam, thereby extending the detection width of the ultrasonic sensor of the present embodiment.

Further, as shown in Fig. 3, the front surfaces of the joint surfaces 11c and 12c of each of the ground members are formed in a straight shape.

The sound dividing surface 20 is vertically formed at the center so as to acoustically separate the piezoelectric vibrator 50 from the transmitting area to the receiving area. The electric wire 30 is connected to the piezoelectric transducer 50 to apply external electric energy to the vibrator. The back surface material 40 is formed on the rear surface of the piezoelectric vibrator 50 to attenuate the ultrasonic beam radiated from the back surface thereof.

The piezoelectric vibrator 50 is a vibrator for generating ultrasonic vibrations and has a transmitter 51 formed to be inclined on one side of the sound dividing surface 20 and a receiver 52 formed obliquely to the other side of the sound dividing surface 20.

The piezoelectric transducer 50 is connected to a wire terminal at one side of a hollow closed enclosure and the electric wire terminal is connected to a transmitter 30 extending from the wire 30 to the inside of the rear panel 40, (51) and receiver (52).

Therefore, when an external electrical signal is applied to the transmitter 51, an ultrasonic wave is generated by the transmitter 51. The ultrasonic wave is reflected on the test piece through the propagation path and then returned to the receiver 52, Information about internal defects of the test piece is stored.

The bonding material 60 is a bonding layer formed between the ground and the piezoelectric vibrator 50 so as to maintain the adhesion therebetween, and it is possible to use the same material as the ground material or use an epoxy resin or the like.

The split type ultrasonic sensor of the present embodiment is characterized in that the curvature of the abutment surfaces 11c and 12c of the respective geomembrane members and the difference in the delay time between the first transmission geomembers 11a and the second transmission geomembers 11b, The beam size in the longitudinal direction of the split type ultrasonic sensor is adjusted by changing the difference in delay rate between the receiving land 12a and the second receiving land 12b.

That is, in the split type ultrasonic sensor of this embodiment, the geomagnetism having a specific geometric shape and the piezoelectric vibrator are bonded by using epoxy, and the curvature of the cross section formed on the joint surface between the plurality of geomembranes and the sound velocity of each geomembrane are controlled , The size of the ultrasonic beam in the longitudinal direction can be adjusted.

5 is a graph showing the result of measurement of beam intensity according to the distance to the test piece in the split type ultrasonic sensor and the conventional ultrasonic sensor of this embodiment.

As shown in FIG. 5, the beam intensity of the ultrasonic sensor according to the present embodiment is smaller than that of the conventional ultrasonic sensor due to the presence of two delay members. However, the variation of the beam intensity, The variation of the beam intensity is decreased.

The present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Therefore, the above embodiments are merely illustrative in all respects and should not be construed as limiting.

1 is a configuration diagram showing a conventional split ultrasonic sensor.

2 is a side view showing a conventional split ultrasonic sensor.

3 is a view illustrating a split type ultrasonic sensor capable of adjusting a beam size according to an embodiment of the present invention.

4 is a side view of a split type ultrasonic sensor capable of adjusting a beam size according to an embodiment of the present invention.

FIG. 5 is a graph showing a measurement result of a beam size according to distance in a split type ultrasonic sensor capable of adjusting the depth of focus according to an embodiment of the present invention and a conventional ultrasonic sensor. FIG.

Description of the Related Art

11: Transmission destination serial number 12: Receiving serial number

20: sound splitting surface 30: wire

40: back face material 50: piezoelectric vibrator

51: sender 52: receiver

60: Bonding material

Claims (2)

A piezoelectric transducer having a transducer formed perpendicularly to the center, a piezoelectric transducer having a transducer formed at one side of the acoustic transducer and inclined at the other side of the acoustic transducer, and a transducer formed at a lower portion of the transducer, In a split type ultrasonic sensor including a geomag- netic material having a receiving- Wherein the transmission delay material comprises a first transmission ground member and a second transmission ground member bonded to a lower surface thereof, wherein the receiving ground member comprises a first receiving member and a second receiving member joined to the lower surface thereof , Wherein a joint surface between the first transmission ground member and the second transmission ground member is formed such that a side end surface thereof is curved downwardly convexly and a joint surface between the first and second reception- The side end face is curved downwardly convexly, By varying the curvature of the abutment surface, the difference in delay time between the first transmission delay member and the second transmission ground member, and the difference in delay rate between the first receiving region and the second receiving region, Wherein the first and second ultrasonic sensors are adjustable in size. delete

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