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US 4,537,503 AGranted
Multiple measuring control volume laser doppler anemometer
AssigneeAtomic Energy of Canada Limited
InventorDirkson D. S. Liu
Life of this patent
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Abstract
The multiple measuring control volume laser Doppler anemometer includes a laser for providing an optical beam. The beam is transformed by an optical arrangement to produce a number V of measuring control volumes wherein each control volume has two focussed optical beams intersecting at a unique predetermined angle .phi.. A detector collects the scattered light from the measuring control volumes in order to determine the velocity at each of the control volumes.
Claims8
A multiple measuring-control volume laser Doppler anemometer comprising:
- laser means for generating an optical beam;
- means for transforming the optical beam to produce a number V of measuring control volumes wherein each control volume has two focussed optical beams intersecting at a unique predetermined angle .phi., wherein the angles .phi..sub.1, .phi..sub.2, . . . .phi..sub.n for the different control volumes each differ from one another, the optical beam transforming means having:
- means for broadening the optical beam into an elongated beam;
- means for splitting the elongated beam into a first elongated beam and a second elongated beam;
- means for gating the first elongated beam into V parallel beams;
- and
- means for causing the second elongated beam to intersect with the V parallel beams to form the control volumes;
- and
- means for detecting the scattered light from measuring control volumes for determining the velocity at each of the control volumes.
6 more elements
A multiple measuring control volume laser Doppler anemometer comprising:
- laser means for generating an optical beam;
- means for transforming the optical beam to produce a number V of measuring control volumes wherein each control volume has two focussed optical beams intersecting at a unique predetermined angle .phi., wherein the angles .phi..sub.1, .phi..sub.2, . . . .phi..sub.n for the different control volumes each differ from one another, the optical beam transforming means having:
- means for splitting the optical beam into a first beam and a second beam;
- means for splitting the first beam into a V number of beams;
- means for broadening the second beam into an elongated beam;
- and
- means for causing the elongated beam to intersect with the V number of beams to form the control volumes;
- and
- means for detecting the scattered light from measuring control volumes for determining the velocity at each of the control volumes.
6 more elements
A multiple measuring control volume laser Doppler anemometer comprising:
- laser means for generating an optical beam;
- means for transforming the optical beam to produce a number V of measuring control volumes wherein each control volume has two focussed optical beams intersecting at a unique predetermined angle .phi., wherein the angles .phi..sub.1, .phi..sub.2, . . . .phi..sub.n for the different control volumes each differ from one another, the optical beam transforming means having:
- means for splitting the optical beam into a V number of beams;
- means for splitting the V number of beams into a first set of V beams and a second set of V beams;
- and
- means for causing each of the beams in the first set of V beams to intersect with a different beam in the second set of V beams to form the control volumes;
- and
- means for detecting the scattered light from measuring control volumes for determining the velocity at each of the control volumes.
5 more elements
A multiple measuring control volume laser Doppler anemometer comprising:
- laser means for generating an optical beam;
- means for transforming the optical beam to produce a number V of measuring control volumes wherein each control volume has two focussed optical beams intersecting at a unique predetermined angle .phi., wherein the angles .phi..sub.1, .phi..sub.2 . . . .phi..sub.n for the different control volumes each differ from one another, the optical beams transforming means having:
- means for splitting the optical beam into a first beam and a second beam;
- means for splitting the first beam into a V number of beams;
- means for splitting the second beam into a V number of beams;
- and
- means for causing each of the V beams from the first beam to intersect with each of the V beams from the second beam to form the control volumes;
- and
- means for detecting the scattered light from measuring control volumes for determining the velocity at each of the control volumes.
6 more elements
Dependencies are inferred from the claim text.