| 摘要 |
PROBLEM TO BE SOLVED: To enable inclination measurement of high precision in a wide measuring range in the case of fine measurement, and reduce constituent cost. SOLUTION: One of fiber rasters 16, 17 composed of parallel fibers 8, 9 is formed on each of two diaphragms 10 and 11, and light sources 6, 7 for irradiating the diaphragms 10, 11 are arranged. The two diaphragms 10, 11 are in a positional relation perpendicular to a liquid 4 surface, and arranged in parallel perpendicular to an imagery surface 18 provided with CCD rows 12a. Both of the filaments 8, 9 form an angle, and its half angle is perpendicular to the imagery surface 18. The filament rasters arranged at intervals are subjected to total reflection from a liquid horizontal line 2, pass a plano-convex lens 13, and form the images on the CCD rows 12a.
|
