Absolute distance measurement by intensity detection using a mode-locked femtosecond pulse laser

Abstract

We propose an interferometric method that enables to measure a distance by the intensity measurement using the scanning of the interferometer reference arm and the recording of the interference fringes including the brightest fringe. With the consideration of the dispersion and absorption of the pulse laser in a dispersive and absorptive medium, we investigate the cross-correlation function between two femtosecond laser pulses in the time domain. We also introduce the measurement principle. We study the relationship between the position of the brightest fringe and the distance measured, which can contribute to the distance measurement. In the experiments, we measure distances using the method of the intensity detection while the reference arm of Michelson interferometer is scanned and the fringes including the brightest fringe is recorded. Firstly we measure a distance in a range of 10 µm. The experimental results show that the maximum deviation is 45 nm with the method of light intensity detection. Secondly, an interference system using three Michelson interferometers is developed, which combines the methods of light intensity detection and time-of-flight. This system can extend the non-ambiguity range of the method of light intensity detection. We can determine a distance uniquely with a larger non-ambiguity range. It is shown that this method and system can realize absolute distance measurement, and the measurement range is a few micrometers in the vicinity of Nl(pp), where N is an integer, and lpp is the pulse-to-pulse length.

Synthetic wavelength interferometry of an optical frequency comb for absolute distance measurement

“…Moreover, such accuracy is still not enough for ultra-precision applications. In order to improve the accuracy of pulse-to-pulse alignment, several attempts have been made on improving the peak finding method 30 , 31 or linking the peak finding with the interferometric phase 32 . In our previous study, we proposed a two-color heterodyne interferometry based on the fundamental and second harmonic (SH) of optical frequency combs 32 .…”

Optimization of Electrostatic Force System Based on Newton Interpolation Method

“…The measurement of micro/nanoforces is of great importance in both science and engineering [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. It is useful in the fields of precision instruments, biology [16,17], magnetic field distributions [18], distance measurement [19], and tribological properties of materials [20][21][22][23]. Atomic force microscope (AFM) is one of most popular microforce measurement instrument.…”

Lazerle Uzaklık Ölçümü ve Bu Alanda Kullanılan Ölçüm Yöntemlerinin Karşılaştırılması

“…Bu önemli mühendislik uygulamalarından birisi de Lazerle Uzaklık Ölçümü olup bu yöntem sivil ve askeri alanda her geçen gün ayrı bir önem kazanmakta olup bu alanda önemli çalışmalar da yapılmaktadır [3][4][5]. Özellikle femtosaniyeli atmalı lazerlerle mesafe ölçümünde önemli çalışmaların yapıldığı görülmektedir [6][7][8]. Lazerle mesafe ölçümü "Girişim Ölçme Metodu, Demet Modülasyon Telemetresi ve Atma Eko Teknikleri" olmak üzere üç temel yöntemle sağlanmaktadır [2].…”