Results 11 to 20 of about 1,287,395 (305)
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
doaj +2 more sources
Dual-Comb Absolute Distance Measurement Based on a Dual-Wavelength Passively Mode-Locked Laser
IEEE Photonics Journal, 2017 A new absolute distance measurement system is demonstrated in this paper, which is based on a dual-wavelength passive mode-locked fiber laser. By controlling the intracavity loss and spectral filtering, the cavity mode-locked by a single-wall carbon ...
Baike Lin +9 more
doaj +2 more sources
Nanotechnology and Precision Engineering, 2018 Passively mode-locked fiber lasers emit femtosecond pulse trains with excellent short-term stability. The quantum-limited timing jitter of a free running femtosecond erbium-doped fiber laser working at room temperature is considerably below one ...
Haosen Shi +8 more
doaj +2 more sources
Absolute distance measurement with an unraveled femtosecond frequency comb [PDF]
International Conference on Space Optics — ICSO 2012, 2017 We demonstrate the measurement of an arbitrary absolute distance with a mode-resolved frequency comb laser. By resolving the frequency comb modes individually with a virtually imaged phase array (VIPA), thousands of lasers modes are available that can be exploited for massively parallel homodyne interferometry. With this method a non-ambiguity range of
Nandini Bhattacharya +4 more
openaire +2 more sources
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
doaj +1 more source
Absolute Distance Measurement Using Frequency-Scanning Interferometry Based on Hilbert Phase Subdivision. [PDF]
Sensors (Basel), 2019 In order to eliminate the influence of laser frequency nonlinearity, the frequency-scanning interferometry (FSI) often uses the beat signal of an auxiliary interferometer as the external clock.
Jiang S, Liu B, Wang H, Zhao B.
europepmc +2 more sources
Synthetic wavelength interferometry of an optical frequency comb for absolute distance measurement. [PDF]
Sci Rep, 2018 We present a synthetic-wavelength based heterodyne interferometer of optical frequency combs with wide consecutive measurement range for absolute distance measurement.
Wu G +5 more
europepmc +2 more sources
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
doaj +1 more source
Optics Express, 2022 Frequency sweeping interferometry with reference interferometer based on sinusoidal phase modulating technique is proposed in this paper for absolute distance measurement. With the frequency of the external cavity diode laser (ECDL) swept continuously in
Shihua Zhang +5 more
semanticscholar +1 more source
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
doaj +1 more source