Investigations of Digital Levels at the SLAC Vertical Comparator

Technical Report · Tue Jan 18 04:00:00 EST 2005

DOI:https://doi.org/10.2172/839706· OSTI ID:839706

Gassner, G ^[1]

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1. SLAC

Digital levels deliver highly accurate and fast measurements in an automated measuring process. A shortcoming is that they give less accurate measurements in some cases. There are several sources which are known to have a systematic effect on the height reading and therefore have to be investigated for our equipment. One parameter is the scale factor which has to be determined on a regular basis. Other sources for inaccurate height readings are measurements at critical distances and at the end sections of the rod, a defocused set-up and artificial illumination. With the findings of the experiments investigating the aforementioned error sources, rules for our fieldwork were established. The experiments were carried out with our instruments, a Trimble (formerly Zeiss) DiNi 12 (SW Version 1.21) and a Leica DNA03 (SW Version 3.40). In some cases, when it is not possible to avoid a critical set-up with the digital leveling system, we use the analog level Wild NA3. Therefore the analog rods have to be also controlled. The calibration is performed with a CCD camera which automatically detects the edges in the image and compares them with the interferometer readings. The CCD camera system is also used to determine the height offset between rods.

• Research Organization: Stanford Linear Accelerator Center (SLAC), Menlo Park, CA
• Sponsoring Organization: SC
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 839706
• Report Number(s): SLAC-PUB-10759
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
CALIBRATION
CAMERAS
ILLUMINANCE
INTERFEROMETERS
STANFORD LINEAR ACCELERATOR CENTER