scholarly journals Laser Doppler shift measuring method based on phase modulater and Fabry-Perot interferometer

2013 ◽  
Vol 62 (18) ◽  
pp. 184206
Author(s):  
Du Jun ◽  
Zhao Wei-Jiang ◽  
Qu Yan-Chen ◽  
Chen Zhen-Lei ◽  
Geng Li-Jie
Keyword(s):  
Doppler Shift ◽  
Measuring Method ◽  
Laser Doppler ◽  
Fabry Perot

Measuring Error of Phase Modulation Laser Doppler Shift Measuring Method

2014 ◽  
Vol 34 (7) ◽  
pp. 0712001 ◽  
Author(s):  
杜军 Du Jun ◽  
曲彦臣 Qu Yancheng ◽  
赵卫疆 Zhao Weijiang ◽  
耿利杰 Geng Lijie ◽  
刘闯 Liu Chuang ◽  
...  
Keyword(s):  
Doppler Shift ◽  
Phase Modulation ◽  
Measuring Method ◽  
Laser Doppler ◽  
Measuring Error

A Kind of Phase Modulation Laser Doppler Shift Measuring Method

2014 ◽  
Vol 43 (11) ◽  
pp. 1112001
Author(s):  
曲彦臣 QU Yan-chen ◽  
杜军 DU Jun ◽  
赵卫疆 ZHAO Wei-jiang ◽  
耿利杰 GENG Li-jie ◽  
刘闯 LIU Chuang ◽  
...  
Keyword(s):  
Doppler Shift ◽  
Phase Modulation ◽  
Measuring Method ◽  
Laser Doppler

scholarly journals Effect of oblique retroreflection from a vibrating mirror on laser Doppler shift

2019 ◽  
Vol 58 (9) ◽  
pp. 2277
Author(s):  
Kusuma Agusanto ◽  
Gih-Keong Lau ◽  
Ting Liu ◽  
Chuangui Zhu
Keyword(s):  
Doppler Shift ◽  
Laser Doppler

Fabry-Perot Velocimetry Techniques: Is Doppler Shift Affected By Surface Normal Direction?

1984 ◽  
Author(s):  
David R. Goosman ◽  
Alan M. Frank, ◽  
Henry H. Chau ◽  
Norval L. Parker
Keyword(s):  
Doppler Shift ◽  
Normal Direction ◽  
Surface Normal ◽  
Fabry Perot

Measuring Method of Virtual Digital Phase Locking for Phase Modulation Laser Doppler Frequency Parameter

2015 ◽  
Vol 35 (s1) ◽  
pp. s112001
Author(s):  
杜军 Du Jun ◽  
李世明 Li Shiming ◽  
赵卫疆 Zhao Weijiang ◽  
曲彦臣 Qu Yanchen
Keyword(s):  
Phase Modulation ◽  
Phase Locking ◽  
Doppler Frequency ◽  
Measuring Method ◽  
Frequency Parameter ◽  
Laser Doppler ◽  
Digital Phase

Research on a Combination of Two Kinds of Phase-modulated Laser Doppler Shift Measurement Methods

2018 ◽  
Vol 47 (4) ◽  
pp. 412003
Author(s):  
杨娜 YANG Na ◽  
杜军 DU Jun ◽  
曲彦臣 QU Yan-chen ◽  
赵卫疆 ZHAO Wei-jiang
Keyword(s):  
Doppler Shift ◽  
Measurement Methods ◽  
Laser Doppler ◽  
Shift Measurement

The LPL Radial Accelerometer

1984 ◽  
Vol 88 ◽  
pp. 63-86 ◽  
Author(s):  
R.S. McMillan ◽  
P.H. Smith ◽  
J.E. Frecker ◽  
W.J. Merline ◽  
M.L. Perry
Keyword(s):  
Optical Fiber ◽  
Radial Velocity ◽  
Doppler Shift ◽  
Focal Plane ◽  
Incident Light ◽  
The Sun ◽  
Stellar Spectrum ◽  
Entrance Aperture ◽  
Fabry Perot ◽  
Interference Order

AbstractWe have begun to observe radial velocities of stars with an optical spectrometer designed for unusually high accuracy. Light from a star image in the focal plane of a telescope is fed to the entrance aperture of the spectrometer by a single optical fiber. Wavelengths are calibrated by transmission of collimated light through a tilt-tunable Fabry-Perot interferometer. The scrambling of incident light rays by the optical fiber and the intrinsic stability of the Fabry-Perot etalon provide immunity to the sources of systematic errors that plague conventional radial velocity meters. The spectrum is dispersed by an echelle grating crossed with another plane reflection grating. Several echelle orders in the vicinity of 4250-4600 Å are imaged in a two-dimensional format on a charge-coupled (CCD) array of detectors. About 350 distinct points on the profile of the stellar spectrum are sampled by successive orders of interferometrie transmission through the etalon. In the vicinity of 4300 Å each interference order is 47 milliangstroms wide and the sample points are 0.64 Å apart, resulting in distinct , widely-spaced monochromatic images of the entrance aperture to be formed in the focal plane of the camera. Changes in Doppler shift cause changes in the relative intensities of these images, according to the slope of the spectral profile at each point sampled. The instrument is being operated as a null-measurement accelerometer, sensitive only to changes in radial velocity, which simplifies operation and enhances sensitivity. With an argon-filled, iron hollow cathode emission line lamp, the interferometer can be calibrated to two parts in 100 million; this corresponds to ± 6 meters/sec in Doppler shift. Calibrations of the interferometer show variations of ± 27 meters/sec on a time scale of months; observations of stars are corrected for such changes. The internal repeatability of observations of the differential Doppler shift of light from the integrated disk of the Sun is ± 6 meters/sec. The corresponding result from about 70 observations of Arcturus (Kl IIIb; B=1.19) is ± 40 meters/sec internal repeatability for each exposure of 20 square-meter seconds. The external repeatability (day-to-day differential accuracy) of nightly averages of stellar observations is ± 20 meters/second. Since the internal precision on the sun and the argon lamp is much better than it is with short exposures on Arcturus, the quality of our observations of stars is limited by the rate of detected photons. This justifies averaging a number of short exposures of a star to approach “laboratory” precision.

Measurement of coronary sinus blood flow by fiber-optic laser Doppler anemometry

1982 ◽  
Vol 242 (6) ◽  
pp. H1111-H1114 ◽  
Author(s):  
D. Kilpatrick ◽  
T. Linderer ◽  
R. E. Sievers ◽  
J. V. Tyberg
Keyword(s):  
Blood Flow ◽  
Coronary Sinus ◽  
Doppler Shift ◽  
Fiber Optic ◽  
Laser Doppler Anemometry ◽  
Electromagnetic Flowmeter ◽  
Laser Doppler ◽  
Fiber Optic Probe ◽  
Coronary Sinus Blood ◽  
Coronary Sinus Blood Flow

The Doppler shift of a laser has been used to measure the velocity of blood in the coronary sinus of the dog. The laser was delivered along a fine fiber-optic probe, which was also used to receive the reflected light. The Doppler shift was measured from the output of a digital spectrum analyzer. This measurement, proportional to the velocity of blood, was correlated with the blood flow measured by an electromagnetic flowmeter. Studies were performed on 112 successful maneuvers in eight consecutive anesthetized dogs. In the minimally damped electromagnetic flow traces, the correlation between coronary sinus blood flow velocity and coronary sinus blood flow was high (r greater than 0.95). This measurement will give absolute flow values only if the exact dimensions of the coronary sinus are known. The linear relationship of coronary sinus velocity and flow supports the postulate that coronary sinus dimension remains similar during normal and high flows. This technique, fiber-optic laser Doppler anemometry, is an accurate measure of relative coronary sinus blood flow. It is suitable for use in human coronary sinuses, especially to monitor the effect of interventions.

A Fabry-Perot Interferometer For Accurate Measurement Of Temporal Changes In Stellar Doppler Shift.

1986 ◽  
Author(s):  
R. S. McMillan ◽  
P. H. Smith ◽  
J. E. Frecker ◽  
W. J. Merline ◽  
M. L. Perry
Keyword(s):  
Doppler Shift ◽  
Temporal Changes ◽  
Fabry Perot
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