Development of a High-Resolution All-Fiber Homodyne Laser Doppler Vibrometer

Shang, Jianhua; He, Yabai; Wang, Qi; Li, Yilun; Ren, Lihong

doi:10.3390/s20205801

Cited by 9 publications

(4 citation statements)

References 35 publications

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“…50 The most important parameters of laser heterodyne measurement refer to the resolution and the precision. 51,52 In a typical laser heterodyne measurement system, the periodic nonlinearity error is a mainly factor which suppresses the measurement precision. Recently, aiming at this error, researchers have carried out a lot of theoretical analyses and experimental works.…”

Section: Laser Heterodyne Interferencementioning

confidence: 99%

“…Currently, the heterodyne structure and the optical Doppler effect have been wildly used in velocity and vibration measurements, due to the optical Doppler effect can achieve non‐contact measurement and the measurement system with a heterodyne structure can identify the direction of target vibration 50 . The most important parameters of laser heterodyne measurement refer to the resolution and the precision 51,52 …”

Section: Laser Heterodyne Interferencementioning

confidence: 99%

See 1 more Smart Citation

Improved laser measurement using advanced techniques: A review

Liu

Wang

et al. 2021

Micro & Optical Tech Letters

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Laser measurement technique has been widely explored and applied in various fields in recent years due to its advantages of high measurement precision and resolution. However, applications in frontier fields such as MEMS motion measurement and robotics control pose have requirement for higher precision and resolution, which promote further studies in improving the performance of this technique. Many advanced techniques have been proposed and applied in the laser measurement system to optimize its performance, and the optimized measurement system has found its way in state-of-the-art applications. In this invited paper, we focus on the latest investigations and new applications of the improved laser measurement methods, especially present recent research works regarding the laser triangulation measurement and the laser heterodyne vibration measurement. At the end, we have discussed further developments and challenges of laser measurement technique.

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Section: Laser Heterodyne Interferencementioning

confidence: 99%

Section: Laser Heterodyne Interferencementioning

confidence: 99%

Improved laser measurement using advanced techniques: A review

Liu

Wang

et al. 2021

Micro & Optical Tech Letters

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show abstract

“…Moreover, the ellipsefitting compensated method (Heydemann correction) [15] for phase difference signals can realize a displacement resolution on the nanometer scale. The development of all-fiber LDV [16,17] has reduced the difficulty of beam guidance inside complicated structures. The interferometry signal beam can be transmitted to a measured object through the flexible implementation of fiber.…”

Section: Introductionmentioning

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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“…Vision-based remote sensing has complemented some of the shortcomings of contact sensors, but there are still limitations in practical use, e.g., out-of-plane target sensing restrictions and only measuring liquids in transparent barrels. On the other hand, laser sensors such as LDV (laser Doppler vibrometer) and LiDAR (light detection and ranging) have high-performance precision and can measure in-plane motion; as such, they are being used in various fields of system measurement and analysis [26,27].…”

Section: Introductionmentioning

confidence: 99%

Multipoint Wave Measurement in Tuned Liquid Damper Using Laser Doppler Vibrometer and Stepwise Rotating Galvanometer Scanner

Shin

Kim

2021

Sensors

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Liquid dampers, such as tuned liquid dampers (TLDs), are employed to improve serviceability by reducing wind-affected building vibrations. In order to maximize the vibration suppression efficiency of the liquid damper, the tuning frequency of the liquid damper should match the natural frequency of the building. Experimental evaluation of the tuning frequency of a liquid damper performed in a factory prior to installation in a building is a critical task to ensure correct performance, and for this, multipoint measurement of the TLD is required. In this study, a novel liquid level measurement system combining Laser Doppler Vibrometer (LDV) and a stepwise rotating galvanometer scanner was developed to observe liquid sloshing in TLD. The proposed system can measure the liquid level at multiple points simultaneously with a single laser point. In the experimental phase, the liquid damper’s natural frequency and mode shape are experimentally evaluated utilizing the developed system. The performance of the proposed system was verified by comparison with the video sensing system.

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Development of a High-Resolution All-Fiber Homodyne Laser Doppler Vibrometer

Cited by 9 publications

References 35 publications

Improved laser measurement using advanced techniques: A review

Improved laser measurement using advanced techniques: A review

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

Multipoint Wave Measurement in Tuned Liquid Damper Using Laser Doppler Vibrometer and Stepwise Rotating Galvanometer Scanner

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