scholarly journals Multiple reflection assisted Laser Doppler Vibrometer setup for high resolution displacement measurement

2020 ◽  
Vol 464 ◽  
pp. 125504
Author(s):  
Nikhil Kumar Pachisia ◽  
Kajal Tiwari ◽  
Ritwick Das
Keyword(s):  
High Resolution ◽  
Laser Doppler Vibrometer ◽  
Multiple Reflection ◽  
Displacement Measurement ◽  
Laser Doppler

scholarly journals Novel laser Doppler linear encoder using multiple-reflection optical design for a high-resolution linear actuator

1998 ◽  
Author(s):  
Deming Shu ◽  
Ercan E. Alp ◽  
Juan Barraza, Jr. ◽  
Tuncer M. Kuzay ◽  
Timothy M. Mooney
Keyword(s):  
High Resolution ◽  
Optical Design ◽  
Multiple Reflection ◽  
Laser Doppler ◽  
Linear Actuator ◽  
Linear Encoder

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

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5801
Author(s):  
Jianhua Shang ◽  
Yan He ◽  
Qi Wang ◽  
Yilun Li ◽  
Lihong Ren
Keyword(s):  
High Resolution ◽  
Background Noise ◽  
Sound Pressure ◽  
Laser Doppler Vibrometer ◽  
Cost Effective ◽  
Pressure Level ◽  
Laser Doppler ◽  
Vibration Measurement ◽  
Calibration Experiment ◽  
Optic Communication

Based on the homodyne detection, a compact and cost-effective all-fiber laser Doppler vibrometer (LDV) with high resolution is presented. For the signal processing, the discrimination algorithm combined with the nonorthogonal correction is applied. The algorithm corrects the quadrature imbalance and other nonlinearity. In the calibration experiment, with the glass pasted on a piezoceramic transducer (PZT), the velocity resolution of 62 nm/s at 4 kHz and displacement resolution of 2.468 pm are achieved. For the LDV-based acousto-optic communication, the minimum detectable sound pressure level (SPL) reached 0.12 Pa under the hydrostatic air-water surface. The results demonstrate that the designed homodyne LDV has a low system background noise and can offer high precision in the vibration measurement.

Noncontact Dynamic Displacement Measurement of Structures Using a Moving Laser Doppler Vibrometer

2019 ◽  
Vol 24 (9) ◽  
pp. 04019089 ◽  
Author(s):  
Piyush Garg ◽  
Fernando Moreu ◽  
Ali Ozdagli ◽  
Mahmoud Reda Taha ◽  
David Mascareñas
Keyword(s):  
Laser Doppler Vibrometer ◽  
Displacement Measurement ◽  
Laser Doppler ◽  
Dynamic Displacement

Optical-fiber laser Doppler velocimeter for high-resolution measurement of pulsatile blood flows

1982 ◽  
Vol 21 (10) ◽  
pp. 1785 ◽  
Author(s):  
H. Nishihara ◽  
J. Koyama ◽  
N. Hoki ◽  
F. Kajiya ◽  
M. Hironaga ◽  
...  
Keyword(s):  
High Resolution ◽  
Optical Fiber ◽  
Fiber Laser ◽  
Laser Doppler ◽  
Laser Doppler Velocimeter ◽  
Blood Flows ◽  
High Resolution Measurement ◽  
Resolution Measurement

Temperature coefficient of Young’s modulus of silver microwhiskers determined by a laser Doppler vibration measurement

2021 ◽  
pp. 2150350
Author(s):  
Yijun Jiang ◽  
Mingyuan Lu ◽  
Shiliang Wang ◽  
Han Huang
Keyword(s):  
Temperature Dependence ◽  
Temperature Coefficient ◽  
Single Crystals ◽  
Young’S Modulus ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Young's Modulus ◽  
Laser Doppler Vibrometer ◽  
Laser Doppler ◽  
Vibration Measurement

Temperature dependence of Young’s modulus of Ag microwhiskers was determined by a laser Doppler vibrometer. The Ag whiskers with diameters in sub-microns were synthesized by the use of physical vapor deposition (PVD). They have a five-fold twinned structure grown along the [1 1 0] direction. The temperature coefficient of Young’s modulus was measured to be [Formula: see text] ppm/K in the range of 300 K to 650 K. The measured values are very close to the reported values of [Formula: see text] ppm/K for bulk Ag single crystals. This finding can benefit the design of Ag-based micro/nano-electromechanical systems or micro/nano-interconnectors operated at elevated or lowered temperatures.

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