Results 1 to 10 of about 436 (50)

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

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, Heulbi Ahn, Jungjae Park, Jonghan Jin   +3 more
doaj   +1 more source

Phase Unwrapping and Frequency Points Subdivision of the Frequency Sweeping Interferometry Based Absolute Ranging System

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, Guang Shi, Hong Liu, Hongyi Lin, Fumin Zhang, Dong Sun   +5 more
doaj   +1 more source

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, Yue Zhang, Ye Zhu, Ya Dai, Xuan Zhang, Xuwen Liang   +5 more
doaj   +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, Schulz Michael, Ehret Gerd   +2 more
doaj   +1 more source

Singular Spectrum Analysis for Extracting Low Amplitude Vibrations in Femtosecond Laser Time-of-Flight Distance Measurements

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, Youjian Song, Minglie Hu, Chingyue Wang   +3 more
doaj   +1 more source

Improved Self-Calibration of a Multilateration System Based on Absolute Distance Measurement

Sensors, 2020
Multilateration tracking systems (MLTSs) are used in industrial three-dimensional (3D) coordinate measuring applications. For high-precision measurement, system parameters must be calibrated properly in advance.
Quoc Khanh Nguyen, Seungman Kim, Seong-Heum Han, Seung-Kook Ro, Seung-Woo Kim, Young-Jin Kim, Wooram Kim, Jeong Seok Oh   +7 more
doaj   +1 more source

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, Ya-Ting Li, Hao Pan, Chun-Zhao Shi, Xing-Hua Qu   +4 more
doaj   +1 more source

Absolute distance measurement in water by optical comb for in-process meaurement of water-guided laser processing

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, Shotaro Kadoya, Masaki Michihata, Satoru Takahashi   +3 more
doaj   +1 more source

Microwave Absolute Distance Measurement Method with Ten-Micron-Level Accuracy and Meter-Level Range Based on Frequency Domain Interferometry

Sensors, 2023
A microwave absolute distance measurement method with ten-micron-level accuracy and meter-level range based on frequency domain interferometry is proposed and experimentally demonstrated for the first time.
Longhuang Tang, Xing Jia, Heli Ma, Shenggang Liu, Yongchao Chen, Tianjiong Tao, Long Chen, Jian Wu, Chengjun Li, Xiang Wang, Jidong Weng   +10 more
doaj   +1 more source