Laser doppler velocimeter

A laser Doppler, velocimeter technology, used in fluid velocity measurement, velocity/acceleration/shock measurement, devices using optical methods, etc., can solve problems such as high optical power limitations

Inactive Publication Date: 2011-04-13
OPTICAL AIR DATA SYST
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  • Application Information

AI Technical Summary

Problems solved by technology

Problems arose, however, because the high optical power required for air velocity measurements became limited by a nonlinear effect called stimulated Brillouin scattering ("SBS") that occurred in the fiber

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Embodiment Construction

[0022] The disclosed speedometer system meets the needs indicated above and provides an LDV that has no moving parts and that is light enough to be used in many different applications that are not feasible for LDVs at this point. The disclosed LDV includes an active laser medium, such as an erbium-doped glass fiber amplifier, for generating and amplifying a beam of coherent optical energy, and an optical system coupled to the beam so as to direct the beam a predetermined distance to a scatterer of radiant energy. The reflected beam is mixed with a reference portion of the beam and used to determine the velocity of the scatterer.

[0023] In using the device to measure wind speed in the focal volume of a telescope, the velocity component measured is the component along the axis of the telescope. Thus, for measurement of "n" components of velocity, n independent measurements must be made along n non-collinear axes (where n is an integer). To accomplish this task, n identical tr...

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Abstract

A laser Doppler velocimeter is formed using a fiber laser as the lasing medium. Within the velocimeter, all optical signals, transmitted and received, are conveyed by optical fibers. An amplifier amplifies a source laser, which is then transmitted to one or more transceivers. The one or more transceivers, each projecting along a different axis, and each with a single optical fiber input / output interface act as both the transmission device to focus the radiation at a target region, and as the receiving system for collecting reflected radiation. The transceivers each include an amplifier to further amplify the radiation received from the laser source. The one or more transceivers transmit radiation simultaneously to the target region, and may be located remotely from the laser source. The portion of the reflected radiation collected by the receiving system is analyzed to determine the Doppler shift caused by targets at the focal point of the one or more transceivers.

Description

technical field [0001] The present invention relates to laser Doppler velocimeters, and more particularly to laser Doppler velocimeters for measuring the velocity of wind or solid objects while compensating for motion of the laser Doppler velocimeter platform. Background technique [0002] A conventional laser Doppler velocimeter ("LDV") transmits light to a target region (eg, into the atmosphere) and receives a portion of that light after it has been scattered or reflected from the target region or scatterers in the target region. The received light is processed by LDV to obtain the Doppler shift f D . Then LDV passes the relation v=(0.5)cf D / f t The velocity v of the teleportation target relative to the LDV, where f t is the frequency of the transmitted light, and c is the velocity of light in the medium between the LDV and the target. [0003] LDVs are very useful and have a wide range of applications including, but not limited to: blood flow measurement, speed limi...

Claims

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Application Information

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IPC IPC(8): G01P3/36
CPCG01S17/58G01P5/26G01S7/4818
Inventor 菲利皮·L·罗杰斯贾·陈·昌普里雅瓦丹·麦密迪普蒂兰斯·勒克莱尔皮特·盖切尔丹尼尔·达金伊莉莎白·A·达金
Owner OPTICAL AIR DATA SYST
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