A high-performance ranging method with a long distance range and high accuracy

Ma, Heli; Liu, Shenggang; Tao, Tianjiong; Chen, Long; Tang, Longhuang; Li, Chengjun; Wu, Jian; Jia, Xing; Xiang, Wang; Weng, Jidong

doi:10.1016/j.ijleo.2021.168526

Cited by 1 publication

(1 citation statement)

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“…More than 100 data points were calculated by DFT in each position, and the statistical mean was treated as the measured distance. The range and linearity were evaluated using the method mentioned in our previous work [22]. The OFDI could measure the absolute distance from 1.171 mm to 5.726 mm with a range of 4.555 mm.…”

Section: Measure Range and Accuracymentioning

confidence: 99%

All-Fiber Pulse-Train Optical Frequency-Domain Interferometer for Dynamic Absolute Distance Measurements of Vibration

Ma,

Liu,

Chen

et al. 2023

Photonics

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In this paper, we propose an all-fiber co-axial optical frequency-domain interferometer (OFDI) in a pulse-train mode with a sample rate of 9 kHz for measuring the vibrations in an internal structure without any contact. It was subjected to a range of 4.555 mm and had an accuracy level of 0.006 mm, as confirmed by a linear motion experiment. Due to the precise time synchronization for reducing the background light leakage and suppressing the dynamic fuzziness, the proposed OFDI could realize the dynamic absolute distance measurements of the vibration process under harmonic excitation with frequencies ranging from 200 Hz to 1800 Hz. The characteristic parameters of vibration could be analyzed using the acquired distance results. Furthermore, the OFDI system obtained the frequency conversion as the time under anharmonic periodic excitation with a sweeping rate of 3600 Hz/s. The measurement performance for the vibration velocity compared with the displacement interferometer system for any reflector (DISAR) was demonstrated in a harmonic excitation experiment. The proposed method expands the application of all-fiber OFDI technology from static to dynamic scenes.

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Section: Measure Range and Accuracymentioning

confidence: 99%