Direct detection Doppler LIDAR method and direction detection Doppler LIDAR device
First Claim
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1. A method for Doppler light detection and ranging (LIDAR) measurement of speeds, the method comprising:
- directing laser pulses at a medium to be measured at a repetition rate of a plurality of laser pulses per measurement; and
operating a detector to detect pulses of radiation, which are emitted by the medium as a result of exposure of the medium to the laser pulses, at a detection rate, the operating including controlling the detector to estimate an intensity of the measurement signal from a previous profile of a measurement signal intensity, select a number of the pulses of radiation which are to be integrated by the detector based on the estimate, and integrate the number of the pulses of radiation per measurement; and
wherein the repetition rate is at least one order of magnitude greater than the detection rate, and the laser pulses for each measurement are transmitted at a frequency of greater than or equal to 1 kHz.
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Abstract
The invention relates to a method for Doppler light detection and ranging (LIDAR) measurement of speeds. A laser beam is directed at the medium to be measured, and radiation which is then emitted by the medium is measured by a detector. In order to allow better control of the dynamic range of a direct reception Doppler LIDAR apparatus, a multiplicity of laser pulses can be transmitted per measurement, and a multiplicity of laser pulses can be received by the detector per measurement. A direct reception Doppler LIDAR apparatus can be suitable for carrying out the method.
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Citations
24 Claims
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1. A method for Doppler light detection and ranging (LIDAR) measurement of speeds, the method comprising:
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directing laser pulses at a medium to be measured at a repetition rate of a plurality of laser pulses per measurement; and operating a detector to detect pulses of radiation, which are emitted by the medium as a result of exposure of the medium to the laser pulses, at a detection rate, the operating including controlling the detector to estimate an intensity of the measurement signal from a previous profile of a measurement signal intensity, select a number of the pulses of radiation which are to be integrated by the detector based on the estimate, and integrate the number of the pulses of radiation per measurement; and wherein the repetition rate is at least one order of magnitude greater than the detection rate, and the laser pulses for each measurement are transmitted at a frequency of greater than or equal to 1 kHz. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A direct reception Doppler light detection and ranging (LIDAR) apparatus, comprising:
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a laser source configured to transmit a plurality of laser pulses to a medium to be measured; a detector configured to receive pulses of radiation emitted by the medium when exposed to the laser pulses; and a controller configured to estimate an intensity of the measurement signal from a previous profile of a measurement signal intensity, select a number of the pulses of radiation which are to be integrated by the detector based on the estimate, control the detector to integrate the number of the pulses of radiation per measurement, and determine a speed of the medium based on an integration of the pulses of radiation received by the detector. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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Specification