Laser doppler velocimeter
First Claim
1. A velocimeter comprising:
- a coherent source configured to produce a coherent beam;
a modulation system configured to add a frequency shift to the coherent beam to produce a modulated beam;
an optical amplifier configured to amplify the modulated beam;
a transceiver configured to receive the amplified beam via a first optical fiber, the transceiver including an amplifier configured to further amplify the amplified beam, and the transceiver configured to transmit the further amplified light to a target region and to receive reflected light from the target region;
wherein the modulation system is located between the coherent source and the transceiver, anda receiver coupled to the transceiver via a second optical fiber and coupled to the coherent source via a third optical fiber, the receiver configured to;
receive the reflected light from the transceiver,receive a reference light from the coherent source, anddetermine a Doppler shift based on the reflected and reference light.
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Accused Products
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.
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Citations
20 Claims
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1. A velocimeter comprising:
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a coherent source configured to produce a coherent beam; a modulation system configured to add a frequency shift to the coherent beam to produce a modulated beam; an optical amplifier configured to amplify the modulated beam; a transceiver configured to receive the amplified beam via a first optical fiber, the transceiver including an amplifier configured to further amplify the amplified beam, and the transceiver configured to transmit the further amplified light to a target region and to receive reflected light from the target region; wherein the modulation system is located between the coherent source and the transceiver, and a receiver coupled to the transceiver via a second optical fiber and coupled to the coherent source via a third optical fiber, the receiver configured to; receive the reflected light from the transceiver, receive a reference light from the coherent source, and determine a Doppler shift based on the reflected and reference light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of determining a velocity of scatterers in a target region, comprising:
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generating a coherent beam; adding a frequency shift to the coherent beam with a modulation system; amplifying the modulated beam with at least first and second amplifiers; transmitting the amplified beam from a transceiver towards the target region; receiving reflected radiation from the target region at the transceiver; combining the received reflected radiation with a reference radiation beam; and determining the velocity of the scatterers in the target region based on the combined received and reference beams. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification