Multi-color laser rangefinder for measuring distance of object, has emission device for emitting laser pulses of different wavelengths whose emission frequency is lesser than preset threshold frequency

摘要

The rangefinder has an emission device for emitting laser pulses of N different wavelengths, where N is an integer that is greater than one, and emission frequency for each wavelength is lesser than a preset threshold frequency. A detection device having an optical coupler (14) detects pulses reflected by a remote object, and an accumulating device accumulates the detected pulses. The emission device has a wideband amplifier (13) to amplify each of the emitted pulses, and emitters (10) e.g. laser diodes, each connected to an optical multiplexer (12) by an optical fiber (11).