Results 11 to 20 of about 947,716 (287)
Frequency-comb-referenced two-wavelength source for absolute distance measurement [PDF]
Optics Letters, 2006 We propose a new tunable laser source concept for multiple-wavelength interferometry, offering an unprecedented large choice of synthetic wavelengths with a relative uncertainty better than 10(-11) in vacuum. Two lasers are frequency stabilized over a wide range of frequency intervals defined by the frequency comb generated by a mode-locked fiber laser.
Schuhler, Nicolas +4 more
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Frequency Discrimination Method Using Asymmetric Transmission Time in FSK Radar [PDF]
Journal of Electromagnetic Engineering and Science, 2022 A frequency discrimination method based on transmission time control is proposed for effective absolute distance measurement using frequency-shift keying (FSK) radar. In FSK radar, each frequency is transmitted for different durations using an asymmetric
Jae Young Sim, Jong-Ryul Yang
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Development of Spectral-Domain Interferometer Having Dual Reference Paths based on Polarization for Measuring Absolute Distances [PDF]
한국정밀공학회지, 2020 A spectral-domain interferometer with dual reference paths and orthogonal polarization states to avoid measurement errors when interference signals overlap is proposed and realized.
Yeoungjun Kim +3 more
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Sensors, 2022 Frequency sweeping interferometry (FSI) based absolute distance ranging has high precision and no ranging blind area. It can be used to realize large-scale and non-cooperative target measurement.
Luming Song +5 more
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Absolute Distance Measurement Based on Self-Mixing Interferometry Using Compressed Sensing
Applied Sciences, 2022 An absolute distance measurement sensor based on self-mixing interferometry (SMI) is suitable for application in aerospace due to its small size and light weight.
Li Li +5 more
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Absolute distance interferometry for subaperture stitching of large freeform optics [PDF]
EPJ Web of Conferences, 2020 We are developing a form measurement system for the surfaces of freeform optics and large conventional optics. The specifications of the optics are diameters up to 1.5 m and radii of curvature down to 10 m.
Spichtinger Jan +2 more
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IEEE Photonics Journal, 2021 We utilize singular spectrum analysis (SSA) for post-processing distance measurement data obtained by a dual-comb femtosecond laser rangefinder. Signal denoising technique based on SSA allows detection of low amplitude vibrations from time series of ...
Hui Cao +3 more
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Absolute distance measurements by laser interferometry [PDF]
International Conference on Space Optics — ICSO 1997, 2019 A double-channel Michelson type interferometer is presented which allows absolute distance measurement up to 3 m with an uncertainty of 0.1 um. It used the principle of synthetic wavelength and can be used under vacuum or in any gaseous medium with the help of a new type of source called an air-wavelength standard.
Rachel Thibout +5 more
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Vibration Compensation of the Frequency-Scanning-Interferometry-Based Absolute Ranging System
Applied Sciences, 2019 The frequency-scanning-interferometry-based (FSI-based) absolute ranging technology is a type of ranging technology possessing a high precision and no ranging blind area, so it can be used for non-cooperative targets. However, due to a tiny movement of a
Fu-Min Zhang +4 more
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Measurement: Sensors, 2021 Water-guided laser processing have been widely used because of low heat affected zone and high aspect ratio processing. However, its processing point is not determined and must be measured with several μm accuracy.
Shusei Masuda +3 more
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