• Title/Summary/Keyword: Michelson

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Measurement Method of Linear Expansion Coefficient for Solid Matter using Michelson Interferometer (Michelson 간섭계에 의한 고체의 선팽창계수 측정방법)

  • Kim, Hong-Gyun;Kim, Young-Sun
    • Journal of Engineering Education Research
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    • v.16 no.2
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    • pp.24-30
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    • 2013
  • This paper deals with the measurement theory and technique of linear expansion coefficient for solid material using Michelson interferometer. The Michelson interferometer produces interference fringes by splitting a beam of monochromatic light so that one beam strikes a fixed mirror and the other a movable mirror. When the reflected beams are brought back together, an interference pattern results. Precise distance measurements until a quarter of wave length can be made with the Michelson interferometer by moving the mirror and counting the interference fringes which move by a photo diode. This paper represents the application of Michelson interferometer for measuring infinitesimal length system and shows the measurement method of linear expansion coefficients for various materials like copper, aluminum and iron. the results are good agreement with theoretical value within margin of error for each materials.

New wavelength locking method using Michelson Interferometer (마이켈슨 간섭계를 이용한 새로운 파장 잠금 방법)

  • Park Kyoungsu;Eom Jinseob
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.5A
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    • pp.376-381
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    • 2005
  • In this paper, we propose a new wavelength locking structure which uses the Michelson interferometer equipped with a movable arm. The proposed one consists of LD driver, Michelson interferometer, automatic temperature controller, automatic power controller, and signal processor. This structure can provide the wavelength locking capability of a resolution below 0.0005nm(=62.4MHz) and cope easily with an external environment variation using movable arm of Michelson interferometer to give a good stability.

Time-Division Multiplexing(TDM) of Michelson type Fiber-optic Interferometric Sensor Arrays (Michelson 간섭계형 광섬유 간섭센서 어레이)

  • 양진성;김명욱;이상배;조재철;최상삼
    • Korean Journal of Optics and Photonics
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    • v.1 no.2
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    • pp.125-129
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    • 1990
  • One method for time-division multiplexing (TDM) of Michelson type fiber-optic interferometric sensor arrays is proposed and demonstrated experimentally. This method has some advantages; fewer fiber-optic components. low cost. and high reliability.bility.

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The Measurement of Refractive Index by using Michelson Interferometer with Rotating Sample (Michelson 간섭계를 이용한 굴절률 측정)

  • Kang, Kab Jung;Cha, Jung Won;Kim, Chung-Sik;Kim, Jung Nam
    • Journal of Korean Ophthalmic Optics Society
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    • v.4 no.2
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    • pp.73-79
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    • 1999
  • The main purpose of this paper is to construct and analyze the Michelson interferometer with rotating sample in order to measure refractive index of solid plate. The theoretical equation and experimental method was proposed in this work. The measured refractive indexes by this system are $n_{6328}$=1.5159 in BK7 and $n_{6328}$=1.4528 in fused silica. These values make a differences by 0.001 in BK7 and 0.003 in fused silica from those of reference. As a result, Michelson interferometer with rotating sample is very advantageous method to find refractive index of plate sample.

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The study of property on the michelson interferometric microscopy (마이켈슨 간섭계형 현미경의 특성 연구)

  • 김경신;권남익
    • Korean Journal of Optics and Photonics
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    • v.10 no.5
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    • pp.369-372
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    • 1999
  • We have constructed an interferometric microscopy using a Michelson interferometer and a He-Ne laser. The three dimensional image was obtained by the interference from the reflected signal by a sample surface and from the reflected signal by a mirror. The axial resolution obtained by Michelson interferometric microscopy is as good as that of the white-light interferometer, but the same fringe is obtained when optical path difference is half-wavelength. The image from Michelson interferometric microscopy was compared with the images from the various types of confocal microscopy.

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Nano-scale high-accuracy displacement measurement using the Michelson laser interferometer controlled with a feedback circuit (되먹임 회로로 제어하는 Michelson 레이저 간섭계를 이용한 Nano-scale 미세변위 측정)

  • Ahn, Seong-Joon;Oh, Tae-Sik;Ahn, Seung-Joon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.8 no.5
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    • pp.1007-1012
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    • 2007
  • A novel Michelson interferometer controlled with a feedback circuit(MIFC) has been developed and its performance has been evaluated. This new interferometer can measure the displacement of the sample by directly reading the feedback bias applied to the PZT whose piezoelectric characteristic is known. The experimental result showed that the step height the silicon membrane measured by using MIFC was actually same with the value measured by SEM, which confirms that MICS is an easy and accurate method for the nano-scale displacement measurement.

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A Study for Absolutely Distance Measurement System of Wavelength Variable Type by Using Pinciple of the Michelson Interometer (마이켈슨 간섭계의 원리를 이용한 파장변화형 절대 거리측정기의 기초 연구)

  • 김철한;신영록;양윤석;김한근;사공건
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.07a
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    • pp.651-653
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    • 2000
  • In this study, a distance-measurement system was proposed by using principle of the Michelson Interferometer and a fundamental research was carried out. In case of the rnichelson interferometer, relativity distance was measured by relativity-difference of two course of light. But wavelength of light source were changed in this system in order to use interference phenomenon of michelson interferometer in measuring absolutely distance. Wavelength of input signal were changed periodically and were interfered electrically. So absolute distance can be calculated by using $\Delta\lambda$ and measuring $\eta\Delta$ in electric interference. Nose by a external factor was small in this system because a absolutely distance was measured by phase difference. And a dispersion of noise was small in pulse-echo response because a error was occurred in range of phase difference of signal. Also very wide range can be measured by only single system because informations of distance were acquisited in wavelength level.

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STUDIES OF GRAVITY WAVES USING MICHELSON INTERFEROMETER MEASUREMENTS OF OH(3-1)BANDS

  • Won, Young-In;Cho, Young-Min;Lee, Bang-Yong;Kim, J.
    • Journal of Astronomy and Space Sciences
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    • v.18 no.1
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    • pp.21-26
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    • 2001
  • As part of a long-term program for polar upper atmospheric studies, temperatures and intensities of the OH(3-1) bands were derived from spectrometric observations of airglow emissions over King Sejong station($62.22^{circ}S,\;301.25^{circ}E$). These measurements were made with a Michelson interferometer to cover wavelength regions between 1000nm and 2000 nm. A spectral analysis was performed to individual nights of data to acquire information on the waves in the upper mesosphere/lower thermosphere. It is assumed that the measured fluctuations in the intensity and temperature of the OH (3-1) airglow were caused by gravity waves propagating through the emission layer. Correlation of intensity and temperature variation revealed oscillations with periods ranging from 2 to 9 hours. We also calculated Krassovsky’s parameter and compared with published values.

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Investigation of the Polarization Cross-Coupling in Fiber Coils Using White Light Michelson Interferometer (백색광 마이켈슨 간섭계를 이용한 광섬유 고리의 편광 교차결합 측정)

  • Jo, Min-Sik;Do, Jae-Chul
    • Journal of the Korea Institute of Military Science and Technology
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    • v.9 no.3
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    • pp.109-115
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    • 2006
  • The investigation of the polarization cross-coupling in fiber coils was made using white light Michelson interferometer. The white light interferometer has a light source of about 13nm spectral bandwidth and measurement resolution of less than -80dB. The measurement found that the 200m fiber coil has a polarization cross-coupling of about -64dB in average and -46dB in maximum.

Diagnosis of Optical FSK Transmitter Output Characteristics Using Michelson Interferometer (Michelson 간섭계를 이용한 광 FSK 송신기 특성검출)

  • 박상영;이규송;임호근;전광석;김창민;홍완혜
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.28A no.10
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    • pp.806-813
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    • 1991
  • In this paper, we suggested the diagnosis of the optical FSK transmitter output characteristics using the Micheloson interferometer. The transmitter is designed by the direct frequency modulation effect of a semoconductor laser diode. The optical FSK transmitter consists of a temperature stabilized semiconductor laser diode and an optimally designed equalizer. It is modulated by 100Mbit/s PRBS Generator to diagonosis of Optical FSK transmitter output characteristics. The Michelson Interferometer is used for the optical frequency discriminator which transforms the output frequency of the transmitter to the amplitude of light. The measurement of the performance of the transmitter to the amplitude of light. The measurement of the performance of the transmitter computer the transmitted data and their eye pattern with the simulation results, the received data and their eye pattern. As the result of experiment, the data transfer rate of the transmitters is 100Mbit/s.

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