| 摘要 |
<p>Surveying equipment for measuring differences in elevation employs a leveling pole (1) and a level. The leveling pole (1) carries division marks formed by coded marks spaced at unit height intervals. The level comprises a telescope (4,6) and an image sensor (9). The output signal of the sensor (9) is decoded for display of digital height values. A thick plate glass block (21) in front of the object lens (4) can be tilted for vertical compensation of the optical axis of the telescope. The angle of inclination ( theta ) of the plate glass block (21) required for compensation is used for interpolation between two adjacent coded marks.</p> |
