Importance

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Abstract

Example embodiments of the described technology provide apparatus and methods for measuring slope angles of surfaces. An example apparatus for measuring a slope angle of a surface may comprise a first laser and a second laser. The first and second lasers may be separated from one another and may be configured to emit parallel light beams towards the surface. The apparatus may also comprise at least one image sensor operable to capture images of the light beams scattered from the surface. The apparatus may also comprise at least one lens positioned to collect the light beams scattered from the surface and focus the scattered light beams onto the at least one image sensor. A controller may be configured to switch one of the first laser and the second laser off to avoid optical interference or cross-talk of the light beams emitted from both the first and second lasers at the at least one image sensor. Additionally, or alternatively, beams emitted by one or both of the lasers may be conditioned to avoid optical interference or cross-talk.

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First Claim