Development of a laser Doppler system for measurement of velocity fields in PVT crystal growth systems

1991 ◽  
Author(s):  
O. C. Jones ◽  
M. E. Glicksman ◽  
Jen T. Lin ◽  
Gusung T. Kim ◽  
N. B. Singh
Keyword(s):  
Crystal Growth ◽  
Velocity Fields ◽  
Laser Doppler ◽  
Doppler System

Development of a laser doppler system for in-process evaluation of diameters on computer numerical controlled turning machines

1998 ◽  
Vol 212 (3) ◽  
pp. 183-194 ◽  
Author(s):  
T Yandayan ◽  
M Burdekin
Keyword(s):  
Scattered Light ◽  
Laser Doppler ◽  
Workpiece Surface ◽  
Cnc Turning ◽  
Tool Offset ◽  
A Value ◽  
Doppler System ◽  
Probe System ◽  
Interface Unit ◽  
Rotating Workpiece

The diameter of the workpiece is measured, while the workpiece is located on the CNC (computer numerical controlled) turning machine, using a new laser instrument and technique. The optical instrument is based on the laser Doppler principle, using an He—Ne laser as a light source. It obtains data by detecting the scattered light from the surface of a rotating workpiece, processing this data with respect to the rotation of the spindle and providing a value representing the workpiece diameter. The basic resolution of the system depends on the wavelength of the laser and geometry of the optics. Higher resolution can be achieved by obtaining the data from the workpiece surface over more than one complete revolution of the spindle. The resolution for one revolution of the spindle is 0.5μm and for ten 0.05μm. The measurement system is also integrated with the CNC turning machine, particularly for autofocusing of the instrument. The instrument is mounted on the tool holder of the CNC turning machine, which is focused by means of a tool offset parameter for non-contact measurement of each different diameter. Autofocusing is carried out using the MI5 machine tool interface unit which is already established for the Renishaw probe system, according to CNC part programming. The performance of the proposed technique and instrument is verified through the experiments.

A Double Wavelength Laser Doppler System to Investigate Skin Microcirculation

1985 ◽  
Vol BME-32 (6) ◽  
pp. 439-447 ◽  
Author(s):  
Luc Duteil ◽  
Jean Claude Bernango ◽  
Wolfgang Schalla
Keyword(s):  
Laser Doppler ◽  
Skin Microcirculation ◽  
Doppler System

scholarly journals Measurement of the Blood Velocity by a Laser-doppler System with an Optical Fiber

1980 ◽  
Vol 8 (2) ◽  
pp. 426-429 ◽  
Author(s):  
Hiroshi NISHIHARA ◽  
Yasumi NISHI ◽  
Jiro KOYAMA ◽  
Noritake HOHKI ◽  
Fumihiko KAJIYA
Keyword(s):  
Optical Fiber ◽  
Blood Velocity ◽  
Laser Doppler ◽  
Doppler System

scholarly journals An attempt to measure cycloidal rotor fan in a rectangular duct

2021 ◽  
Vol 345 ◽  
pp. 00029
Author(s):  
Tomasz Staśko ◽  
Mirosław Majkut ◽  
Sławomir Dykas ◽  
Krystian Smołka
Keyword(s):  
Air Conditioning ◽  
Flow Direction ◽  
Rectangular Channel ◽  
Velocity Fields ◽  
Laser Doppler ◽  
Marine Propeller ◽  
Rectangular Duct ◽  
Direct Control ◽  
Flow Rates

A fan with cycloidal rotor (CRF) becomes a popular idea in wide application such as aviation, HVAC (heat, ventilation and air conditioning) or marine propeller systems. This is due to advantages such as direct control of the flow direction, larger flow rates than in a conventional machines without cycloidal control. In the presented article, velocity fields of CRF placed in a rectangular channel was measured, using Laser Doppler Anemomentry (LDA) method and thermoanemometric probe (TA).

Differential laser Doppler system with expanded beams for velocity measurement

2013 ◽  
Vol 21 (5) ◽  
pp. 1102-1109
Author(s):  
李秀明 LI Xiu-ming ◽  
黄战华 HUANG Zhan-hua ◽  
朱猛 ZHU Meng
Keyword(s):  
Velocity Measurement ◽  
Laser Doppler ◽  
Doppler System

Laser-Doppler system for detection of aircraft trailing vortices

1970 ◽  
Vol 58 (3) ◽  
pp. 322-326 ◽  
Author(s):  
R.M. Huffaker ◽  
A.V. Jelalian ◽  
J.A.L. Thomson
Keyword(s):  
Laser Doppler ◽  
Doppler System ◽  
Trailing Vortices

A differential laser Doppler system for one-dimensional in-plane motion measurement of MEMS

Measurement ◽  
2007 ◽  
Vol 40 (6) ◽  
pp. 623-627 ◽  
Author(s):  
Ying Zhong ◽  
Guoxiong Zhang ◽  
Changlin Leng ◽  
Tao Zhang
Keyword(s):  
Plane Motion ◽  
Laser Doppler ◽  
Motion Measurement ◽  
One Dimensional ◽  
Doppler System
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