Patent
Method and device for Doppler laser velocimetry with homodyne detection
Leger Dominique,Serrot Gerard +1 more
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TLDR
In this article, a laser velocimeter with homodyne detection is constructed from a laser 1 whose linearly polarised radiation is applied in 10 to an optical system 2 of the Mach-Zender interferometer type.Abstract:
The laser velocimeter with homodyne detection is constructed from a laser 1 whose linearly polarised radiation is applied in 10 to an optical system 2 of the Mach-Zender interferometer type. The measurement beam strikes the object, whose velocity is to be measured, either directly or through a telescope 8. The signal beam S and the local oscillator beam OL are produced with a slight angular offset between them before striking a double detector 5. The angular offset is chosen so that the wavefronts of the two beams are offset by a half wavelength over the whole surface of the double detector 5. A comparison of the phases of the signals received by the two detectors gives the sign of the velocity.read more
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Solid-block homodyne interferometer
Hans W. Mocker,Thomas J. Wagener +1 more
TL;DR: In this article, a solid-block homodyne Doppler interferometer utilizing continuous-wave or pulse-wave light beam technology was proposed, which eliminates the need for individually supported mirrors and beamsplitters.
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Detection of air flow speed and flow direction
TL;DR: In this article, a transmitter (41) is arranged to produce and focus a beam (54) on a remote focal point (55), a small proportion of resultant light (58) is backscattered from the focal point by particles or aerosols in air flowing through point(55) and returns to a receiver (42) where it is collected.
Patent
All-fiber wind measurement laser radar apparatus baed on asymmetric M-Z interferometer and method
TL;DR: In this article, an all-fiber wind measurement laser radar apparatus based on an asymmetric M-Z interferometer and a method is presented. But, the measurement sensitivity can be raised by reducing the free spectrum spacing of the MZI and the demodulation method of differential intersect multiply by is adopted.
Patent
Optical system for angular velocity measurement
Dong Yi,Zhang Yanling,Tian Ya +2 more
TL;DR: In this article, an optical system for angular velocity measurement is described, which includes a laser light source, a first beam splitting prism, a polarization beam splitter, a second beamsplitting prism, spiral phase sheet and a quarter wave plate.
Patent
Angular velocity measurement system capable of finely adjusting light intensity ratio of signal light to reference light
Dong Yi,Tian Ya,Zhang Yanling +2 more
TL;DR: In this article, an angular velocity measurement system consisting of a laser light source, a first beam splitter prism, a polaroid and a photoelectric detector was proposed to adjust the light intensity ratio of signal light to reference light.
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Patent
Apparatus for measuring velocity by the detection of scattered light
TL;DR: In this article, the velocity of an object through a fluid, e.g. the air, is determined by providing on the object, a light source radiating a beam of light 17 into the fluid and a receiver 15, receiving light 18 scattered from said beam by particles of the fluid, and comprising means determining the Doppler shift in the received light due to the velocity.
Patent
Improvements in or relating to Vibration Responsive Apparatus
TL;DR: In this article, a laser beam is split into two orthogonally polarized beams by prisms 14 having a polarizing dielectric interface and the outputs of the detectors are passed to a differential amplifier whose output comprises a signal representative of the vibrations of the element 10 and modulated at the frequency of the mirror 16.
Patent
Contactless determination of direction of movement - uses two opto-electronic transducers to pick up reflected light, and uses phases of their output signals to determine direction
TL;DR: In this article, the transducers are staggered in the direction of movement, and their output signals (S1, S2) are converted into rectangular signals, which are then compared in a phase comparator and binary signals are delivered, depending on the positive or negative phase shift.
Related Papers (5)
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