초록 ▼

A laser Doppler velocimeter in which laser light whose frequency changes continuously at least for a fixed time duration is branched into at least two beams, and the at least two branched beams are respectively transmitted by at least one pair of optical fibers having an optical path difference ther

A laser Doppler velocimeter in which laser light whose frequency changes continuously at least for a fixed time duration is branched into at least two beams, and the at least two branched beams are respectively transmitted by at least one pair of optical fibers having an optical path difference therebetween, and are focused onto a region to be measured by at least one focusing device. The scattered light of the laser beams focused in the region to be measured are received by a light-receiving device via at least one incident device. At least one Doppler shift frequency in the region to be measured is calculated on the basis of the frequency of a signal of the scattered light received by the light-receiving device, the optical path difference, and a rate of change of the frequency of the laser light. The flow velocity and the direction of the flow velocity are calculated from the calculated Doppler shift frequency.

대표청구항 ▼

A laser Doppler velocimeter comprising: a light source for emitting laser light whose frequency changes continuously for at least a fixed time duration; a branching device for branching the laser light emitted from said light source into at least two beams; at least one pair of optical fibers for tr

A laser Doppler velocimeter comprising: a light source for emitting laser light whose frequency changes continuously for at least a fixed time duration; a branching device for branching the laser light emitted from said light source into at least two beams; at least one pair of optical fibers for transmitting each of the laser beams branched by said branching device, said optical fibers having an optical path difference therebetween; at least one focusing device for focusing the laser beams transmitted by said optical fibers onto a region to be measured; at least one incident device upon which is projected scattered light from the region to be measured where the laser beams are focused; a light-receiving device for receiving the scattered light from said incident device; and a calculating device for calculating at least one Doppler shift frequency in the region to be measured on the basis of a frequency of a signal of the scattered light received by said light-receiving device, said optical path difference, and a rate of change of the frequency of the laser light.