A simple technique for eliminating the nonlinearity of a heterodyne interferometer

Hou, Wenmei; Zhang, Yunbo; Hu, Haijiang

doi:10.1088/0957-0233/20/10/105303

Cited by 32 publications

(17 citation statements)

References 12 publications

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“…To predict and reduce the damage caused by an earthquake, the seismic signal needs to be precisely measured and analyzed. As a precision measurement sensor, the heterodyne laser interferometer has many advantages such as wide dynamic range, high accuracy, and sub-nanometer resolution [ 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. Using the Doppler effect, the heterodyne laser interferometer detects the shifted frequency of a returned beam from a moving retro-reflector.…”

Section: Introductionmentioning

confidence: 99%

Earthquake Magnitude Estimation Using a Total Noise Enhanced Optimization Model

Lee

et al. 2019

Sensors

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In this paper, a heterodyne laser interferometer, which is used as a sensor for high-precision displacement measurement, is introduced to measure ground vibration and seismic waves as a seismometer. The seismic wave is measured precisely through the displacement variation obtained by the heterodyne laser interferometer. The earthquake magnitude is estimated using only the P-wave magnitudes for the first 3 s through the total noise enhanced optimization (TNEO) model. We use data from southern California to investigate the relationship between peak acceleration amplitude ( P d ) and the earthquake magnitude ( M g ). For precise prediction of the earthquake magnitude using only the P d value, the TNEO model derives the relation equation between P d and the magnitude, considering the noise present in each measured seismic data. The optimal solution is obtained from the TNEO model based objective function. We proved the performance of the proposed method through simulation and experimental results.

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Section: Introductionmentioning

confidence: 99%

Earthquake Magnitude Estimation Using a Total Noise Enhanced Optimization Model

Lee

et al. 2019

Sensors

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“…The main sources of nonlinearity error in heterodyne laser interferometers are non-ideal polarization of laser beam and optical parts especially polarizing-beam splitter (PBS); among these factors, non-ideal polarization namely nonorthogonality and ellipticity the polarization states of the source have the largest share in the nonlinearity error [1]. Up to now, many studies have been conducted on the effect of various factors on nonlinearity error and some methods have been presented for the nonlinearity compensation [2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

A Nonlinearity Error Compensation Method in Nanometrology System Based on Developed Threelongitudinal Mode Heterodyne Interferometer

2018

IJOMAM

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Among the various types of Michelson interferometers, developed three-longitudinal mode heterodyne interferometer (DTLMI)has the most measurement accuracy in term of measuring the displacement in nanoscale. But nonlinearity error is a factor that limits the measurement precision in all heterodyne interferometers. Hence, in this paper, a new simple method has been presented for compensating the nonlinearity errors in DTLMI. By using the presented method, about 96% nonlinearity error can be compensated. Also, simplicity and nonimposing the electronic and optical complexities on the system and high-speed compensation are among the obvious characteristics of this method.

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“…In this paper, we propose a precision seismometer system with a laser interferometer [ 16 , 17 , 18 , 19 ]. Contrary to the seismometer based on accelerometers, it can determine the arrival time of a P-S wave and the epicenter location more accurately.…”

Section: Introductionmentioning

confidence: 99%

Laser-Interferometric Broadband Seismometer for Epicenter Location Estimation

Lee

Kwon

You

2017

Sensors

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In this paper, we suggest a seismic signal measurement system that uses a laser interferometer. The heterodyne laser interferometer is used as a seismometer due to its high accuracy and robustness. Seismic data measured by the laser interferometer is used to analyze crucial earthquake characteristics. To measure P-S time more precisely, the short time Fourier transform and instantaneous frequency estimation methods are applied to the intensity signal (Iy) of the laser interferometer. To estimate the epicenter location, the range difference of arrival algorithm is applied with the P-S time result. The linear matrix equation of the epicenter localization can be derived using P-S time data obtained from more than three observatories. We prove the performance of the proposed algorithm through simulation and experimental results.

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A simple technique for eliminating the nonlinearity of a heterodyne interferometer

Cited by 32 publications

References 12 publications

Earthquake Magnitude Estimation Using a Total Noise Enhanced Optimization Model

Earthquake Magnitude Estimation Using a Total Noise Enhanced Optimization Model

A Nonlinearity Error Compensation Method in Nanometrology System Based on Developed Threelongitudinal Mode Heterodyne Interferometer

Laser-Interferometric Broadband Seismometer for Epicenter Location Estimation

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