| 摘要 |
PROBLEM TO BE SOLVED: To shorten measuring time in a distance/speed meter and a distance/speed measurement method capable of measuring not only the distance to a measurement object in a stationary state, but also the speed of the measurement object by using interference of light. SOLUTION: This distance/speed meter has a laser driver 4-1 for operating a semiconductor laser 1-1 so that a first operation period when the oscillation wavelength increases and a second oscillation period when the oscillation wavelength decreases alternately exist, a laser driver 4-2 for operating a semiconductor laser 1-2 so that increase and decrease in the oscillation wavelength is reverse to that in the laser 1-1, photodiodes 2-1, 2-2 for converting the optical outputs of the lasers 1-1, 1-2 into electric signals, counting means 5-1, 5-2, 6-1, 6-2, 7 for counting the number of interference waveforms contained in the outputs of the photodiodes 2-1, 2-2 for each of the photodiodes 2-1, 2-2, and a calculation device 8 for calculating the distance to the measurement object and the speed of the measurement object from the minimum oscillation wavelength(s) and the maximum oscillation wavelength(s) of the lasers 1-1, 1-2 and the counting results. COPYRIGHT: (C)2009,JPO&INPIT |
