GAUGE FOR MEASURING GLASS THICKNESS AND GLASS PANE SPACING

摘要

A laser gauge for measuring the thickness of glass panes and the spacing between glass panes in a sealed insulated window. A laser beam is directed at a predetermined angle to a first glass surface. Reflections from the glass surfaces pass through a gauge housing (41), through a slot (52) in an adjustable slide (43), and impinge on a matted finished surface of a thin scale (15). The housing and the slide are formed from materials having a predetermined coefficient of friction relative to each other to provide smooth movement to the slide in the housing. The scale is sufficiently thin to avoid false readings from internal reflections within the scale. The scale is adjustable on the slide to align the first reflection with reference indicia. For each glass pane and for each pane spacing, the slide is adjusted so that a first surface reflection aligns with the reference indicia and a second surface reflection is compared with the indicia on the scale to determine the thickness of the glass pane or glass pane spacing. A separate set of indicia may be provided on the scale for measuring the spacing between glass panes.