Abstract
We have developed a CO2 laser radar for the robotic vision. The amplitude of a CO2 laser beam is modulated sinusoidally with an electro-optic modulator (EOM) . The distance is measured as the phase difference of the modulation between the detected return light from the target and the reference signal. The range image is obtained when the laser beam is scanned in two directions. The frequency of modulation of 5 MHz, 15 MHz, and 40 MHz are examined. The good result of the resolution of 3 cm is achieved at the modulation frequency of 40 MHz. Moreover, the range images through the simulated disaster circumstances have been obtained, which demonstrated the good transparency of the CO2 laser.
