Grating, optical dial, and various reticules are widely used in the geodetic surveying field. The geodetic surveying apparatus includes the total station, electronic theodolite, optical theodolite, laser rangefinder, automatic sight level, various field instruments, and large-scale and high-precision measuring equipment (such as satellite telemeter and aerial surveying apparatus).
Material | BK7 or Fused Silica |
Design Wavelength | 546.1 nm |
BK7 | 1.5183 ± 0.0005 |
Fused Silica | 1.46008±0.00005 |
Diameter Tolerance | +0.00, -0.15 mm |
Thickness Tolerance | ±0.2 mm |
Paraxial Focal Length | ±2% |
Centration | <3 arc minutes |
Clear Aperture | >85% |
Surface Irregularity | λ/4@632.8 nm |
Surface Quality | 60-40 scratch and dig |
Protective Bevel | 0.25 mm x 45° |
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No. 1567 Liu Ying Lu, Kuan Cheng District, Chang Chun, P.R. China
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