公开(公告)号：KR100452301B1

公开(公告)日：2004-10-08

申请号：KR1020020051939

申请日：2002-08-30

Applicant: 재단법인 포항산업과학연구원

Inventor： 박형국 ,  오기장 ,  임충수

IPC: G01R15/24

Abstract: PURPOSE: An apparatus for simultaneously measuring a current and a voltage by using an optical fiber and a method for the same are provided, which are installed more easier than a conventional electric transformer or a conventional crystal optic sensor. CONSTITUTION: An apparatus for simultaneously measuring a current and a voltage by using an optical fiber includes a laser(1), a first polarization plate(2), a polarization modulator(3), a sensor head(4), a second polarization plate(5), an optical detector(6), a lock-in amplifier(8) and a converting block. The laser(1) generates a laser beam and the first polarization plate(2) deflects the laser beam generated from the laser(1) at a predetermined angle. The polarization modulator(3) generates an electrical signal for the reference voltage and periodically modulates the linear polarized light into a circular polarized light. The sensor head(4) induces the changes of the linear polarized light for the current and the circular polarized light for the voltage. The second polarization plate(5) makes the output light of the sensor head(4) to be polarized at a predetermined angle. The optical detector(6) changes the output light of the second polarization plate(5) into an electrical signal. The lock-in amplifier(8) measures the amount of changes of the circular light by receiving the electrical signal of the polarization modulator(3) and the optical detector(6). And, the converting block converting the amount of polarization changes of the lock-in amplifier(8) into the values of a current and the voltage.

Abstract translation: 目的：提供一种通过使用光纤同时测量电流和电压的设备及其方法，其比传统的电子变压器或传统的晶体光学传感器更容易安装。 本发明提供一种利用光纤同时测量电流和电压的装置，包括激光器（1），第一偏振片（2），偏振调制器（3），传感头（4），第二偏振片 （5），光学检测器（6），锁定放大器（8）和转换块。 激光器（1）产生激光束，并且第一偏振板（2）以预定角度偏转从激光器（1）产生的激光束。 偏振调制器（3）产生用于参考电压的电信号并周期性地将线偏振光调制成圆偏振光。 传感头（4）感应电流的线偏振光和电压的圆偏振光的变化。 第二偏振板（5）使传感器头（4）的输出光以预定角度偏振。 光学检测器（6）将第二偏振板（5）的输出光改变为电信号。 锁定放大器（8）通过接收偏振调制器（3）和光学检测器（6）的电信号来测量圆形光的变化量。 并且，转换块将锁定放大器（8）的偏振变化量转换为电流和电压的值。

公开(公告)号：KR1020020050832A

公开(公告)日：2002-06-28

申请号：KR1020000080016

申请日：2000-12-22

Applicant: 재단법인 포항산업과학연구원 ,  주식회사 포스코

Inventor： 박형국 ,  임충수 ,  오기장

IPC: G01P3/68

CPC classification number: G01P3/685 ,  G01D5/38 ,  G01P3/486 ,  G02B27/30

Abstract: PURPOSE: An apparatus for measuring a speed of a high temperature object and a method thereof are provided, which measures a transportation speed of the object accurately, by maintaining a constant intensity and polarization of two beams incident on the high temperature object and by removing a noise light generated at the high temperature. CONSTITUTION: The apparatus includes a semiconductor laser(21) radiating a laser beam, and a Brag cell(22) dividing the laser beam radiated from the semiconductor laser into two beams having different frequencies each other, and a bending mirror(23) bending two laser beams divided by the Brag cell, and optical fibers(24,25) which are connected to the bending mirror respectively and transport the bent laser beams respectively. And a sensor head(27) is constituted to radiate the laser beam transported by the optical fibers to a steel(26). The sensor head includes polarization beam splitters(28,29) dividing the laser beam into a vertically polarized beam and a horizontally polarized beam, and bending mirrors(30,31) bending the horizontally polarized beam, and polarization diffraction gratings(32,33) converting the horizontally polarized beam bent in the bending mirrors into a vertically polarized beam.

Abstract translation: 目的：提供一种用于测量高温物体的速度的装置及其方法，其通过保持入射在高温物体上的两束光的恒定强度和极化，并且通过去除 在高温下产生的噪音光。 该装置包括：辐射激光束的半导体激光器（21）和将从半导体激光器辐射的激光束分成两束具有不同频率的激光束的布拉格单元（22），以及弯曲反射镜（23） 由Brag单元分割的激光束和分别连接到弯曲镜的光纤（24,25）分别传送弯曲的激光束。 并且传感器头（27）被构造成将由光纤传送的激光束辐射到钢（26）。 传感器头包括将激光束分成垂直偏振光束和水平偏振光束的偏振分束器（28,29）和弯曲水平偏振光束的弯曲反射镜（30,31）和偏振衍射光栅（32,33） 将弯曲镜中弯曲的水平偏振光束转换为垂直偏振光束。

公开(公告)号：KR1020020050831A

公开(公告)日：2002-06-28

申请号：KR1020000080015

申请日：2000-12-22

Applicant: 재단법인 포항산업과학연구원 ,  주식회사 포스코

Inventor： 임충수 ,  박형국 ,  김달우

IPC: G01J7/00

CPC classification number: G01J7/00 ,  G01J1/0411 ,  G01J1/0429

Abstract: PURPOSE: A laser speed measuring apparatus and method is provided to measure the laser speed in a stable and easy manner in a wide variety of industrial fields by using an optical fiber in measurement. CONSTITUTION: An apparatus comprises a sensor head(40) installed adjacent to the production line for a steel plate(30); a plurality of devices installed in an operating room(20); and optical fibers(31,32) for interconnecting the component of the sensor head and the devices installed in the operating room. The operating room includes a laser unit(21); a polarization scrambler(22) for removing polarization property from the laser beam emitted from a laser unit; an optical detector(23) for detecting the intensity of a light(45) scattered at the steel plate; and a speed measuring unit(24) for measuring the transfer speed of the steel plate through the intensity of the scattered light detected by the optical detector. The sensor head includes a wollaston prism(42) for receiving, through the optical fiber(31), the laser beam passed through the polarization scrambler, and dividing the laser beam into two laser beams; mirrors(43,44) for reflecting the two laser beams such that the two laser beams are radiated at the same point of the steel plate; and a polarization rotating unit(46) for rotating, 90 degrees in polarization direction, one of the laser beams radiate to the steel plate by the mirrors. The light scattered at the steel plate is transmitted to the optical detector through the optical fiber(32).

Abstract translation: 目的：提供激光测速装置和方法，通过在测量中使用光纤，在各种工业领域中以稳定和容易的方式测量激光速度。 构成：装置包括安装在钢板（30）的生产线附近的传感头（40）; 安装在手术室（20）中的多个装置; 以及用于互连传感器头部件和安装在手术室中的装置的光纤（31,32）。 手术室包括激光单元（21）; 偏振加扰器（22），用于从激光单元发射的激光束去除偏振特性; 用于检测在钢板上散射的光（45）的强度的光学检测器（23）; 以及用于通过由光学检测器检测到的散射光的强度来测量钢板的传送速度的速度测量单元（24）。 传感器头包括用于通过光纤（31）接收穿过偏振加扰器的激光束并将激光束分成两束激光束的渥拉斯顿棱镜（42）; 用于反射两个激光束的反射镜（43,44），使得两个激光束在钢板的同一点被辐射; 以及用于在偏振方向上旋转90度的偏振旋转单元（46），其中一个激光束通过反射镜辐射到钢板。 在钢板上散射的光通过光纤（32）传输到光学检测器。

公开(公告)号：KR1020020006139A

公开(公告)日：2002-01-19

申请号：KR1020000039626

申请日：2000-07-11

Applicant: 주식회사 포스코 ,  재단법인 포항산업과학연구원

Inventor： 임충수 ,  박형국 ,  오기장

IPC: B21B38/00

CPC classification number: B21B38/00 ,  B21B2275/06

Abstract: PURPOSE: A system for discriminating velocity and direction of metal plate is provided to decrease velocity/direction deviation with simple process. CONSTITUTION: The system for discriminating transfer velocity and direction of metal plate comprises a laser beam generation means for outputting laser beam to be irradiated on a moving metal plate(P), wherein the laser beam generation means is a semiconductor laser(10) and is equipped with a main optical fiber(12) for outputting laser beam generated from the semiconductor laser; a division means for dividing laser beam outputted from the laser beam generation means, wherein the division means is equipped with an optical fiber divider(14) connected to the main optical fiber, and first and second optical fibers(16,18) which are connected to the main optical fiber and reciprocally have the same dimensions; an irradiation means for irradiating the divided laser beams on one point of the moving steel sheet, wherein the irradiation means comprises a first sighting lens(20), a second sighting lens(22) and an optical isolator(24); a condensing means for condensing scattered light which is scattered after being reflected from the moving metal plate, wherein the condensing means is a condensing lens; a means for measuring a transfer speed of an object to be transferred by analyzing the scattered light, wherein the speed measuring means is composed of an optical detector(28), a frequency analyzer(30) and a signal processing unit(32); and a moving direction measuring means equipped with an optical detector(34) which is connected to the signal processing unit(32).

Abstract translation: 目的：提供一种用于鉴别金属板的速度和方向的系统，以简单的过程减少速度/方向偏差。 构成：用于识别金属板的传送速度和方向的系统包括：激光束产生装置，用于输出要照射在移动金属板（P）上的激光束，其中激光束产生装置是半导体激光器（10），并且是 配备有用于输出从半导体激光器产生的激光束的主光纤（12） 用于分割从激光束产生装置输出的激光束的分割装置，其中分割装置配备有连接到主光纤的光纤分配器（14），以及连接到主光纤的第一和第二光纤（16,18） 到主光纤并且具有相同的尺寸; 照射装置，用于在移动钢板的一个点上照射分割的激光束，其中照射装置包括第一瞄准镜（20），第二瞄准镜（22）和光隔离器（24）; 冷凝装置，用于聚集从活动金属板反射后散射的散射光，其中聚光装置是聚光透镜; 用于通过分析散射光来测量要传送的物体的传送速度的装置，其中速度测量装置由光学检测器（28），频率分析仪（30）和信号处理单元（32）组成; 以及装配有连接到所述信号处理单元（32）的光学检测器（34）的移动方向测量装置。

公开(公告)号：KR100299453B1

公开(公告)日：2001-11-22

申请号：KR1019960070090

申请日：1996-12-23

Applicant: 주식회사 포스코 ,  재단법인 포항산업과학연구원

Inventor： 오기장 ,  박형국

IPC: G01N21/00

Abstract: PURPOSE: A method of measuring surface cleanness of steel plate is provided to achieve quality improvement of products by measuring thickness of pollution layer through the measurement of intensity of reflected laser light. CONSTITUTION: A method comprises a first step of measuring a reference laser intensity by the signal output from a first optical detector, a second step of measuring the intensity of regular reflection light by the signal output from a second optical detector; and a third step of obtaining the thickness of pollution layer in accordance with a predetermined formula. An apparatus for the method includes an optical divider(2) for dividing the laser radiated onto a steel plate(4) from a laser source(1); a first optical detector(3) for detecting the laser reflected from the optical divider; a second optical detector(6) for detecting the laser passed through the optical divider, radiated onto the steel plate and focused by a focus lens(5); a multiple input/output board(7) for receiving signals output from optical detectors, and performing analog/digital conversion; and an operation unit(8) for performing arithmetic operation to the signal output from the first optical detector.

公开(公告)号：KR100299451B1

公开(公告)日：2001-11-22

申请号：KR1019960070066

申请日：1996-12-23

Applicant: 주식회사 포스코 ,  재단법인 포항산업과학연구원

Inventor： 김달우 ,  박형국

IPC: G01N21/63

Abstract: PURPOSE: An apparatus and method for measuring compositions of alloy by using laser plasma is provided to achieve improved measuring ability by receiving an increased amount of plasma radiation. CONSTITUTION: An apparatus comprises an Nd:glass laser generator(22) for generating a laser beam to be radiated onto an alloy steel; a prism(23) for dividing the laser beam into two branched, and transmitting one to a laser energy measuring unit and the other to mirrors(24,25); mirrors for adjusting the migration distance of the laser beam between the prism and an alloy steel; a condensing lens(26) for condensing laser beam reflected from the mirrors to the alloy steel; a vacuum chamber(27) containing the alloy steel; an ellipsoidal mirror(29) for receiving the plasma radiation emitted from the vacuum chamber at one focus, and reflecting the plasma radiation to an optical divider by using the other focus; a slit(30) for controlling amount of radiation reflected from the ellipsoidal mirror; a spectrometer(31) for transferring specific wavelength of the radiation to an optical detector(32); the optical detector for transferring the radiation output from the spectrometer to an A/D converter(33); the A/D converter for converting the signal received from the optical detector to a digital signal; a computer(34) displaying compositions of the alloy steel on a monitor; a pulse generator(35) for receiving pulse laser synchronization signal and opening a gate of the optical detector; and a laser power supply unit(21) for supplying power to the Nd:glass laser generator, and transmitting a pulse laser synchronization signal to the pulse generator.

公开(公告)号：KR100277075B1

公开(公告)日：2001-02-01

申请号：KR1019960071436

申请日：1996-12-24

Applicant: 주식회사 포스코 ,  재단법인 포항산업과학연구원

Inventor： 박형국 ,  주만길 ,  김달우 ,  임충수

IPC: G01B11/30

Abstract: 본 발명은 전기방전 가공롤에 의한 주기적인 표면 거칠기 분포를 가지는 강판의 표면 거칠기를 실시간으로 정확히 측정하는 방법의 제공에 관한 것이다.
본 발명의 방법은 레이저광을 주기적인 표면 거칠기의 강판 표면에 입사시키되 이 레이저광의 파장을 약 3.39㎛ 이상으로 하고 강판표면에 대한 레이저광의 입사각을 약 75∼85°로 하여 주기적인 표면 거칠기 분포의 영향이 없는 조건에서 표면 거칠기 측정을 이루어내는 것을 특징으로 한다.
이와 같은 본 발명의 방법을 사용할 경우 전기방전가공롤에 의한 주기적인 표면거칠기를 가지는 강판의 거칠기를 실시간으로 정확히 측정해 낼 수 있는 효과가 얻어진다.

公开(公告)号：KR1020040056231A

公开(公告)日：2004-06-30

申请号：KR1020020082804

申请日：2002-12-23

Applicant: 재단법인 포항산업과학연구원

Inventor： 임충수 ,  박형국

IPC: G01N29/024

Abstract: PURPOSE: An apparatus and method for measuring a speed of an ultrasonic wave are provided to stably measure the speed of the ultrasonic wave regardless of a high temperature and a contamination. CONSTITUTION: An apparatus for measuring a speed of an ultrasonic wave includes a laser source(7), a condensing lens(9), a non-contact type ultrasonic sensor(8), and a signal processing section(6). The laser source(7) is installed at an outer portion of a roll oil pipe in order to generate a pulse laser beam. The condensing lens(9) collects the pulse laser beam, thereby generating an ultrasonic wave(5). The non-contact type ultrasonic sensor(8) is installed at an outer portion of the roll oil pipe(1) in opposition to the laser source(7) in order to detect the ultrasonic wave(5). The signal processing section(6) calculates the speed of the ultrasonic wave(5).

Abstract translation: 目的：提供用于测量超声波速度的装置和方法，以稳定地测量超声波的速度，而不管高温和污染如何。 构成：用于测量超声波速度的装置包括激光源（7），聚光透镜（9），非接触式超声波传感器（8）和信号处理部分（6）。 激光源（7）安装在辊油管的外部，以产生脉冲激光束。 聚光透镜（9）收集脉冲激光束，从而产生超声波（5）。 为了检测超声波（5），非接触型超声波传感器（8）与激光源（7）相对地设置在辊油管（1）的外侧。 信号处理部（6）计算超声波（5）的速度。

公开(公告)号：KR1020040020345A

公开(公告)日：2004-03-09

申请号：KR1020020051939

申请日：2002-08-30

Applicant: 재단법인 포항산업과학연구원

Inventor： 박형국 ,  오기장 ,  임충수

IPC: G01R15/24

Abstract: PURPOSE: An apparatus for simultaneously measuring a current and a voltage by using an optical fiber and a method for the same are provided, which are installed more easier than a conventional electric transformer or a conventional crystal optic sensor. CONSTITUTION: An apparatus for simultaneously measuring a current and a voltage by using an optical fiber includes a laser(1), a first polarization plate(2), a polarization modulator(3), a sensor head(4), a second polarization plate(5), an optical detector(6), a lock-in amplifier(8) and a converting block. The laser(1) generates a laser beam and the first polarization plate(2) deflects the laser beam generated from the laser(1) at a predetermined angle. The polarization modulator(3) generates an electrical signal for the reference voltage and periodically modulates the linear polarized light into a circular polarized light. The sensor head(4) induces the changes of the linear polarized light for the current and the circular polarized light for the voltage. The second polarization plate(5) makes the output light of the sensor head(4) to be polarized at a predetermined angle. The optical detector(6) changes the output light of the second polarization plate(5) into an electrical signal. The lock-in amplifier(8) measures the amount of changes of the circular light by receiving the electrical signal of the polarization modulator(3) and the optical detector(6). And, the converting block converting the amount of polarization changes of the lock-in amplifier(8) into the values of a current and the voltage.

Abstract translation: 目的：提供一种通过使用光纤同时测量电流和电压的装置及其方法，其比常规电变压器或常规晶体光学传感器更容易安装。 构成：通过使用光纤同时测量电流和电压的装置包括激光器（1），第一偏振片（2），偏振调制器（3），传感器头（4），第二偏振片 （5），光学检测器（6），锁定放大器（8）和转换块。 激光器（1）产生激光束，并且第一偏振板（2）使从激光器（1）产生的激光束以预定角度偏转。 偏振调制器（3）产生用于参考电压的电信号，并将线性偏振光周期性地调制为圆偏振光。 传感器头（4）引起用于电流的线偏振光和用于电压的圆偏振光的变化。 第二偏振板（5）使传感器头（4）的输出光以预定角度偏振。 光检测器（6）将第二偏振板（5）的输出光改变为电信号。 锁定放大器（8）通过接收偏振调制器（3）和光学检测器（6）的电信号来测量圆形光的变化量。 并且，转换块将锁定放大器（8）的极化变化量转换成电流和电压值。

公开(公告)号：KR1020030053105A

公开(公告)日：2003-06-28

申请号：KR1020010083143

申请日：2001-12-22

Applicant: 주식회사 포스코 ,  재단법인 포항산업과학연구원

Inventor： 임충수 ,  박형국 ,  오기장

IPC: G01B9/02

CPC classification number: G01B9/02023 ,  G01D5/268 ,  G01D5/353 ,  G02B2006/12111

Abstract: PURPOSE: An apparatus for measuring Doppler shift by using an optical fiber is provided to measure correctly the Doppler shift regardlessly of the external vibration by improving the sensitivity of a sensor. CONSTITUTION: A Doppler shift measurement apparatus includes a collecting lens(10), a Doppler shift sensor(20), and a beam detector(36). The collecting lens is used for collecting the scattered light generated from a laser beam. The Doppler shift sensor receives the scattered light from the collecting lens and analyzes the multiple reflection of the scattered light and the frequency of the scattered light. The beam detector is connected to the Doppler shift sensor. The Doppler shift sensor includes an inlet portion(22) for receiving the scattered light, an optical fiber coupler(24) formed at a rear portion of the inlet portion, an optical fiber splitter(28) for splitting the scattered light, and a circulation portion for circulating partially the scattered light.

Abstract translation: 目的：提供一种通过使用光纤测量多普勒频移的装置，通过提高传感器的灵敏度，正确地测量多普勒频移，无论外部振动如何。 构成：多普勒频移测量装置包括收集透镜（10），多普勒频移传感器（20）和光束检测器（36）。 收集透镜用于收集由激光束产生的散射光。 多普勒频移传感器接收来自收集透镜的散射光，并分析散射光的多重反射和散射光的频率。 光束检测器连接到多普勒频移传感器。 多普勒频移传感器包括用于接收散射光的入口部分（22），形成在入口部分后部的光纤耦合器（24），用于分散散射光的光纤分离器（28） 用于部分地散射散射光的部分。