| 摘要 |
A laser scanner apparatus is disclosed herein for measuring the geometry and physical dimensions of one or more objects in a specified location or platform. The specified location or platform is within a range less than a predetermined maximum object distance. The laser scanner includes a waveform generator that generates a predetermined reference waveform to an analog laser that provides an modulated laser beam responsive to the reference waveform, an optical scanning system which 1) transmits and scans the object with the modulated laser light beam and 2) includes a means for receiving reflected the modulated laser light from the surface of an object on the platform or specified location, an avalanche photo-detector positioned to receive the processed modulated light from the optical processing system, and convert energy in the incident light into an amplitude-modulated range signal, a mixer is provided to down-convert the frequency of the range signal into a lower (LF) frequency. In practice, a first electrical circuit receives the down-converted range signal and converts it into a converted waveform that has a sinusoidal wave falling and rising that correspond to the zero crossings. The reference waveform is also applied to a mixer that down-converts it to the LF frequency. A second electrical circuit receives the down-converted reference waveform and converts it a second converted waveform that has a sinusoidal wave falling and rising that correspond to the zero crossings. A computer receives the first and second converted waveforms and outputs a highly accurate signal indicative of the time delay there between. The time delay is used by the computer system to determine the physical dimension of the particular scanning.
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