KR20110037770A - A measuring device for displacement volume - Google Patents

A measuring device for displacement volume Download PDF

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KR20110037770A
KR20110037770A KR1020090095332A KR20090095332A KR20110037770A KR 20110037770 A KR20110037770 A KR 20110037770A KR 1020090095332 A KR1020090095332 A KR 1020090095332A KR 20090095332 A KR20090095332 A KR 20090095332A KR 20110037770 A KR20110037770 A KR 20110037770A
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South Korea
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sensor
cable
block
sensor block
displacement
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KR1020090095332A
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Korean (ko)
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KR101149817B1 (en
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권영억
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권영억
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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
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
    • G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/30—Measuring arrangements characterised by the use of mechanical techniques for measuring the deformation in a solid, e.g. mechanical strain gauge
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
    • G01L5/10—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means
    • G01L5/103—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means using sensors fixed at one end of the flexible member
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)

Abstract

PURPOSE: A displacement measuring sensor is provided to easily measure deformation under the ground or in an exposed area and to enable easy installation and manufacturing. CONSTITUTION: A displacement measuring sensor comprises a cable(100) and a sensor block(200). The cable and sensor block are fixed to a target area. The sensor block comprises a piston and a sensor unit. The piston is connected to the cable in the sensor block. The sensor unit is connected between the piston and the sensor block. The cable is wound on a winding unit(130). The cable is connected to one end connected to the sensor block through a tension sensing unit(140). The sensor unit comprises a strain gauge type sensor.

Description

변위량 측정센서{a measuring device for displacement volume}Displacement measurement sensor {a measuring device for displacement volume}

본 발명은 측정지역에 각각 고정되는 일정길이의 케이블과 센서블럭이 연결되는 구성으로 이루어지면서 상기 센서블럭의 내측에는 케이블에 연결되는 피스톤 및 상기 피스톤과 센서블럭 사이에 연결되는 센서유니트가 구비되는 구성으로 이루어져 지중이나 노출지역에서 변형량을 손쉽게 측정할 수 있도록 하는 변위량 측정센서에 관한 것이다.The present invention is made of a configuration that is connected to the cable and the sensor block of a certain length fixed to each measuring area while the inside of the sensor block is provided with a piston connected to the cable and a sensor unit connected between the piston and the sensor block The present invention relates to a displacement sensor for easily measuring deformation in a ground or an exposed area.

일반적으로 터널 등을 굴착하거나 기타 대형 토목공사 현장에서는 공사를 하고자 하는 곳의 각 지형마다 지반이나 암반의 구성 상태와 토질조건들이 차이를 나타내기 때문에, 토목공사를 하고자 하는 곳의 기초암반이나 지반 등의 구성 상태와 거동상태를 사전에 정확히 조사하고 이를 토대로 토목공사의 설계와 시공계획을 기획 하게 되는데, 이때 사용되는 계측기의 정확도는 토목공사에 상당한 영향을 미치게된다.In general, in the excavation of tunnels or other large civil engineering sites, the ground and rock composition and soil conditions are different for each of the terrain where the work is to be constructed. The construction and behavior of the structure is accurately investigated in advance and based on this, the design and construction plan of civil engineering work is planned, and the accuracy of the measuring instrument used has a significant effect on civil engineering work.

이와같은 기술과 관련되어 등록특허 제529840호에 진동현식 변위계가 개시되어 있으며 그 구성은 도1에서와 같이, 하우징(10)의 외면과 변위봉(30)의 끝단에 토목이나 건축구조물의 외벽면에 고정 설치할 수 있는 하우징홀더(15)와 변위봉홀 더(35)를 각각 형성하고, 상기 하우징홀더(15)와 변위봉 홀더(35)를 건축물이나 토목구조물의 크랙이 진행되고 있는 양측에 고정 설치하여 균열측정계로 직접 사용할수도 있다.In connection with such a technique, a vibration expression displacement meter is disclosed in Korean Patent No. 529840, and its configuration is as shown in FIG. A housing holder 15 and a displacement rod holder 35, which can be fixedly installed on the housing holder, respectively, and the housing holder 15 and the displacement rod holder 35 are fixed to both sides of the building or civil engineering structure cracking. It can also be used directly as a crack meter.

상기한 본 발명은 외부 환경의 변화에 따른 힘이 변위봉(30)을 통하여 진동현(50)에 전달됨에 있어서 코일스프링(60)을 통하여 전달됨으로 직접적인 충격이 진동현(50)에 그대로 전달되지 않고 상당한 힘이 코일스프링(60)에서 흡수되며, 변위봉(30)의 변위거리의 상당량을 코일스프링(60)에서 흡수하고 잔여 변위량을 진동현(50)에 전달하게 되는 구성으로 이루어 진다.In the present invention described above, since the force according to the change of the external environment is transmitted to the vibrating string 50 through the displacement rod 30, the direct shock is not transmitted to the vibrating string 50 as it is. The force is absorbed in the coil spring 60, and a substantial amount of the displacement distance of the displacement rod 30 is absorbed in the coil spring 60 is made of a configuration that transmits the remaining displacement amount to the vibrating string (50).

이때, 상기 진동현(50)이 결합된 가이드램(20)에 코일스프링(60)을 결합한 후 이를 다시 하우징(10) 외부와 연결되는 변위봉(30)과 연결하여서 변위봉(30)에 가해지는 외부의 힘이 코일스프링(60)을 통하여 진동현(50)에 전달 되도록 설치된다.At this time, the coil spring 60 is coupled to the guide ram 20 to which the vibrating string 50 is coupled, and then connected to the displacement rod 30 connected to the outside of the housing 10 to be applied to the displacement rod 30. External force is installed to be transmitted to the vibrating string 50 through the coil spring (60).

그러나, 상기와 같은 변위계는, 각각의 변위계가 분리설치되는 구성으로 이를 연결하기 위한 구조가 복잡하게 되며, 변위계의 보관이 힘들게 됨은 물론 분실의 염려가 있는 등의 문제점이 있는 것이다.However, the displacement meter as described above has a problem in that the structure for connecting each displacement meter is installed in a complicated structure, and the storage of the displacement meter becomes difficult, as well as a risk of loss.

또한, 일정한 거리를 갖는 동일 직선상에 위치한 지역에서만 측정이 가능하여 측정지역의 제한이 따르게 되는 문제점이 있는 것이다.In addition, the measurement is possible only in the area located on the same straight line having a certain distance is a problem that the limitation of the measurement area is followed.

상기와 같은 종래의 문제점들을 개선하기 위한 본 발명의 목적은, 지중이나 노출지역에서 변형을 손쉽게 측정할 수 있도록 하고, 구조를 단순화 시켜 설치 및 제작이 용이하게 이루어 질 수 있도록 하며, 기밀구조를 갖도록 하여 센서의 신뢰성을 향상 시킬 수 있도록 하고, 항상 일정한 장력조건에서 측정이 가능토록 하여 측정을 단순화 시켜 정확한 값을 얻을 수 있도록 하는 변위량 측정센서를 제공하는 데 있다.An object of the present invention for improving the conventional problems as described above, to make it easy to measure the deformation in the underground or exposed area, to simplify the structure and to be easy to install and manufacture, to have a gas tight structure It is to provide a displacement measuring sensor that can improve the reliability of the sensor, and to make it possible to measure under constant tension conditions at all times, thereby simplifying the measurement to obtain accurate values.

본 발명은 상기 목적을 달성하기 위하여, 측정지역에 각각 고정되는 일정길이의 케이블과 센서블럭의 연결구조로 이루어 지며,The present invention is made of a connection structure of a cable and a sensor block of a predetermined length fixed to each measuring area, in order to achieve the above object,

상기 센서블럭은, 그 내측에 케이블과 연결되는 피스톤 및 상기 피스톤과 센서블럭에 연결되는 센서유니트가 조립되는 구성으로 이루어 진 변위량 측정센서를 제공한다.The sensor block provides a displacement measuring sensor having a configuration in which a piston connected to a cable and a sensor unit connected to the piston and the sensor block are assembled therein.

그리고, 본 발명의 케이블은, 일단에 인출정도의 표시가 가능한 지시기가 구비되는 권취기에 감져지고, 센서블럭과 연결되는 일단에 장력감지유니트를 개재되는 변위량 측정센서를 제공한다.In addition, the cable of the present invention provides a displacement measuring sensor which is wound around a winder provided with an indicator capable of displaying the degree of withdrawal at one end and a tension sensing unit is interposed at one end connected to the sensor block.

또한, 본 발명의 센서유니트는, 스트레인게이지형 센서로서 진동현식 및 전기저항식센서중 선택되는 어느 하나가 사용되고, 상기 센서유니트는 센서블럭에 구비되면서 회전결합되는 커버부재를 개방한 후 연결되며, 상기 피스톤은 그 둘레에 실링부재가 더 구비되면서 센서블럭의 일측으로 노출되는 연결바가 일체로 연결되는 구성으로 이루어 진 변위량 측정센서를 제공한다.In addition, the sensor unit of the present invention, any one selected from the vibration expression and electrical resistance sensor is used as the strain gauge type sensor, the sensor unit is connected to the sensor block is provided after opening the cover member that is rotationally coupled, The piston provides a displacement measuring sensor made of a configuration in which the connecting bar exposed to one side of the sensor block is integrally connected while the sealing member is further provided around the piston.

이상과 같이 본 발명에 의하면, 지중이나 노출지역에서 변형을 손쉽게 측정하고, 구조를 단순화 시켜 설치 및 제작이 용이하게 이루어 지며, 기밀구조를 갖도록 하여 센서의 신뢰성을 향상 시키고, 항상 일정한 장력조건에서 측정이 가능토록 하여 측정을 단순화 시키면서 정확한 값을 얻게 되는 효과가 있는 것이다.As described above, according to the present invention, it is easy to measure the deformation in the ground or the exposed area, and to simplify the structure, easy to install and manufacture, to improve the reliability of the sensor by having a gas tight structure, always measured under constant tension conditions This has the effect of obtaining accurate values while simplifying the measurement.

이하, 첨부된 도면에 의거하여 본 발명의 실시예를 상세하게 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도2a,b는 각각 본 발명에 따른 변위량 측정센서의 설치상태를 도시한 사시도이고, 도3은 본 발명에 따른 변위량 측정센서를 도시한 사시도이며, 도4는 본 발명에 따른 변위량 측정센서를 도시한 단면도이다.Figure 2a, b is a perspective view showing the installed state of the displacement measuring sensor according to the present invention, Figure 3 is a perspective view showing a displacement measuring sensor according to the present invention, Figure 4 shows a displacement measuring sensor according to the present invention One cross section.

본 발명은, 측정지역(A)에 각각 고정되는 일정길이의 케이블(100)과 센서블럭(200)의 연결구조로 이루어 진다.The present invention is made of a connection structure of the cable 100 and the sensor block 200 of a predetermined length, respectively fixed to the measurement area (A).

그리고, 상기 센서블럭(200)은, 그 내측에 케이블(200)과 연결되는 피스톤 (210)및 상기 피스톤(210)과 센서블럭(200) 사이에 연결되는 센서유니트(250)의 조립구조로 이루어 진다.The sensor block 200 has an assembly structure of a piston 210 connected to a cable 200 inside the sensor block 200 and a sensor unit 250 connected between the piston 210 and the sensor block 200. Lose.

이때, 상기 케이블(100)은, 일단에 인출정도의 표시가 가능한 지시기(131)가 구비되는 권취기(130)에 감져진다.At this time, the cable 100 is wound around the winding machine 130 provided with an indicator 131 capable of displaying the degree of withdrawal at one end.

또한, 상기 케이블(100)은, 센서블럭(200)과 연결되는 일단에 장력감지유니트(140)를 개재하여 연결된다.In addition, the cable 100 is connected via a tension sensing unit 140 at one end connected to the sensor block 200.

그리고, 상기 센서유니트(250)는, 스트레인게이지형 센서로서 진동현식 및 전기저항식센서중 선택되는 어느 하나가 사용된다.The sensor unit 250 may be any one selected from a vibration expression type and an electric resistance type sensor as a strain gauge type sensor.

또한, 상기 피스톤(210)은, 그 둘레에 실링부재(215)가 더 구비되면서 센서블럭(200)의 일측으로 스프링(미도시)을 개재하여 탄성적으로 노출되는 연결바(217)가 일체로 연결되는 구성으로 이루어 진다.In addition, the piston 210, while the sealing member 215 is further provided around the connection bar 217 is elastically exposed through a spring (not shown) to one side of the sensor block 200 integrally. It is made up of connected components.

상기 센싱블럭(200)에는 마이콤(310)과 상기 마이콤에 연동되어 동작하면서 RF송수신유니트 또는 신호케이블(350)이 연결되는 신호송수신장치(330)가 더 설치되는 구성으로 이루어 진다. The sensing block 200 has a configuration in which a signal transmission and reception device 330 to which an RF transmission / reception unit or a signal cable 350 is connected is further installed while operating in conjunction with a microcomputer 310 and the microcomputer.

상기와 같은 구성으로 이루어진 본 발명의 동작을 설명한다.The operation of the present invention having the above configuration will be described.

도2 내지 도4에서 도시한 바와같이 본 발명은, 측정지역(A)의 일측에 일단이 고정되면서 일정길이로 인출이 가능토록 설치되는 케이블(100)과 상기 케이블(100)의 타단에 연결되면서 측정지역의 다른 일측에 고정되는 센서블럭(200)의 연결구조로 이루어져 측정지역에서 케이블(100)의 장력변화에 의해 변형량을 측정토록 된다.As shown in Figures 2 to 4, the present invention is connected to the other end of the cable 100 and the cable 100 is installed so that one end is fixed to one side while being fixed to one side of the measuring area (A) It consists of a connection structure of the sensor block 200 is fixed to the other side of the measurement area to measure the deformation amount by the tension change of the cable 100 in the measurement area.

이때, 상기 케이블(100)은, 먼저 일정한 길이로 세팅되어 센서블럭(200)에 감겨져 사용될 수도 있으나 바람직하게로는 케이블의 길이에 상관없이 사용이 가능토록 일정한 길이의 케이블(100)이 권취되어 있는 권취기(130)에 연결하여 사용하는 것이 좋다.At this time, the cable 100 is first set to a predetermined length may be wound on the sensor block 200, but preferably used, the cable 100 of a certain length is wound so that it can be used regardless of the length of the cable. It is good to use connected to the winder (130).

그리고, 상기 권취기(130)는, 모터가 내장되어 자동으로 케이블이 감겨지거나 풀러지는 자동권취 또는 사용자의 핸들조작에 의해 감겨지거나 풀려지는 수동조작에 의해 케이블(100)의 감김 및 풀림이 가능토록 된다.In addition, the winding unit 130, the winding of the cable 100 is automatically wound or unwinded by the automatic winding or unwinding or unwinding of the cable 100 by the manual operation that is wound or released by the user's handle operation to enable the winding and unwinding of the cable 100. do.

더하여, 상기 권취기(130)에는 케이블(100)이 풀려져 나갈 때 그 길이를 알수 있도록 되어 측정지역의 길이를 측정하지 않아도 케이블의 풀려나간 정도에 의해 그 길이를 정확하게 알수 있도록 된다.In addition, when the cable 100 is released, the winder 130 can know its length so that the length can be accurately known by the degree of the cable being released without measuring the length of the measurement area.

또한, 상기 센서블럭(200)은, 케이블(100)을 통하여 측정지역에 고정될 때 케이블(100)에 작용하는 장력변화를 감지하여 이를 변화량으로 환산하는 센서유니트(250)가 내장되어 측정지역의 변형량을 측정할 수 있게 된다.In addition, the sensor block 200, when the fixed to the measurement area through the cable 100, the sensor unit 250 for detecting the change in the tension acting on the cable 100 and converting it into the amount of change is built-in The deformation amount can be measured.

이때, 상기 센서블럭(200)은, 케이블(100)의 단부에 개재되는 장력감지유니트(140)를 통하여 일정한 장력으로 측정지역에 설치된 후 측정지역에서 외부의 응력 작용시 그 장력이 변화토록 되는 케이블(100)의 변형시 상기 케이블(200)과 연결되는 피스톤(210)이 센서블럭(200)에 일단이 연결되는 센서유니트(250)를 당겨 변형량을 측정하게 된다.In this case, the sensor block 200 is installed in the measuring zone with a constant tension through the tension sensing unit 140 interposed at the end of the cable 100, the cable to change the tension when the external stress acts in the measuring zone. When deformation of the 100, the piston 210 connected to the cable 200 pulls the sensor unit 250, one end of which is connected to the sensor block 200, to measure the deformation amount.

그리고, 상기 센서유니트(250)는, 스트레인게이지형 센서로서 파장에 의해 변형량을 측정하는 진동현식 및 케이블의 신장시 그 저항을 측정하는 전기저항식센서중 선택되는 어느 하나가 사용되어 케이블의 장력변화시 발생되는 응력을 통하여 용이하게 측정할 수 있게 된다.In addition, the sensor unit 250 is a strain gauge type sensor, and any one selected from a vibration expression measuring a deformation amount by a wavelength and an electrical resistance sensor measuring its resistance when the cable is stretched is used to change the tension of the cable. The stress generated at the time can be easily measured.

또한, 상기 피스톤(210)은, 그 둘레에 실링부재(215)가 더 구비되면서 센서블럭(200)의 일측으로 노출되는 연결바(217)가 일체로 연결되는 구성으로 별도의 밀봉장치를 설치하지 않아도 습도나 물기가 많은 지역에 용이하게 설치할 수 있게 된다.In addition, the piston 210, while the sealing member 215 is further provided around the connection bar 217 exposed to one side of the sensor block 200 is integrally connected to the configuration does not install a separate sealing device It can be easily installed in areas with high humidity or moisture.

그리고, 상기 센싱블럭(200)에는 마이콤(310)과 상기 마이콤에 연동되어 동작하면서 RF송수신유니트 또는 신호케이블(350)이 연결되는 신호송수신장치(330)가 더 설치되어 유선 및 무선신호의 송출이 가능토록 하면서 유선을 통한 전원 및 신호전달이 가능토록 되는 것이다.In addition, the sensing block 200 is further provided with a signal transmission and reception device 330 to which the RF transmission and reception unit or signal cable 350 is connected while operating in conjunction with the microcomputer 310 and the microcomputer to transmit wired and wireless signals. It is possible to transmit power and signals through wires.

도1은 종래의 지중변위 센서의 설치상태를 도시한 사시도이다.1 is a perspective view showing an installation state of a conventional ground displacement sensor.

도2a,b는 각각 본 발명에 따른 변위량 측정센서의 설치상태를 도시한 사시도이다.2A and 2B are perspective views illustrating an installation state of the displacement sensor according to the present invention, respectively.

도3은 본 발명에 따른 변위량 측정센서를 도시한 사시도이다.3 is a perspective view showing a displacement measuring sensor according to the present invention.

도4는 본 발명에 따른 변위량 측정센서를 도시한 단면도이다.4 is a cross-sectional view showing a displacement sensor according to the present invention.

*도면의 주요 부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

100...케이블 130...권취기100 ... cable 130 ... winder

200...센서블럭 210...피스톤200 ... Sensor block 210 ... Piston

215...실링부재 217...연결바215 Sealing member 217 Connecting bar

250...센서유니트250 ... sensor unit

Claims (5)

측정지역에 각각 고정되는 일정길이의 케이블(100)과 센서블럭(200)의 연결구조로 이루어 지며, It consists of a connection structure of a cable 100 and a sensor block 200 of a predetermined length fixed to each measurement area, 상기 센서블럭(200)은, 그 내측에 케이블(200)과 연결되는 피스톤 (210)및 상기 피스톤(210)과 센서블럭(200) 사이에 연결되는 센서유니트(250)의 조립구조로 이루어 지는 변위량 측정센서The sensor block 200 has a displacement amount formed of an assembly structure of a piston 210 connected to a cable 200 inside the sensor block 200 and a sensor unit 250 connected between the piston 210 and the sensor block 200. Measuring sensor 제1항에 있어서, 상기 케이블(100)은, 일단에 인출정도의 표시가 가능한 지시기(131)가 구비되는 권취기(130)에 감져지고,According to claim 1, The cable 100 is wound around the winding machine 130 is provided with an indicator 131 capable of displaying the degree of withdrawal at one end, 센서블럭(200)과 연결되는 일단에 장력감지유니트(140)를 개재하여 연결되는 것을 특징으로 하는 변위량 측정센서Displacement measurement sensor, characterized in that connected via the tension sensing unit 140 at one end connected to the sensor block 200 제1항에 있어서, 상기 센서유니트(250)는, 스트레인게이지형 센서로서 진동현식 및 전기저항식센서중 선택되는 어느 하나가 사용되는 것을 특징으로 하는 변위량 측정센서According to claim 1, The sensor unit 250, the displacement gauge sensor characterized in that any one selected from the vibration expression and electrical resistance sensor as the strain gauge type sensor is used. 제1항에 있어서, 상기 센서블럭(200)은, 상기 피스톤(210)의 둘레에 실링부재(215)가 더 구비되면서 센서블럭(200)의 일측으로 스프링(미도시)을 개재하여 탄성적으로 노출되는 연결바(217)가 일체로 연결되는 것을 특징으로 하는 변위량 측 정센서According to claim 1, The sensor block 200, while the sealing member 215 is further provided around the piston 210 is elastically via a spring (not shown) to one side of the sensor block 200. Displacement measurement sensor, characterized in that the connection bar 217 is exposed integrally connected 제1항에 있어서, 상기 센싱블럭(200)에는 마이콤(310)과 상기 마이콤에 연동되어 동작하면서 RF송수신유니트 또는 신호케이블(350)이 연결되는 신호송수신장치(330)가 더 설치되는 것을 특징으로 하는 변위량 측정센서The signal transmission and reception device 330 of claim 1, wherein the sensing block 200 is further provided with a microcomputer 310 and an RF transmitter / receiver unit or signal cable 350 connected to the microcomputer. Displacement sensor
KR1020090095332A 2009-10-07 2009-10-07 a measuring device for displacement volume KR101149817B1 (en)

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