Alignment and Metrology Department

-A-

Alignment

The process by which an item is adjusted into an ideal design position.

Alignment Lug

A round metal disk attached to a component that is known with respect to a given point or location within the component. Many TeV components have these installed.

-B-

Bar Code Rod

Any of various length rods having a barcode scale in a vertical direction typically used for doing level runs. 2 meter and 3 meter lengths are commonly us ed at Fermilab. See picture

Brass

Typically a floor installed horizontal reference mark. Approximately 1<94> in diameter screwed into an anchor that is drilled into a concret floor, wall or ceiling. A small punch mark is installed in the brass at the desired location.

-C-

Crew Chief

The person in charge of other individual survey party members.

-D-

Digital Level

An instrument used to do work along a vertical plane, with gravity as the reference, reading barcode scales or rods off of the points or surfaces of interest. See picture

Dijak Bolt

A bolt modified in design to accept various 1/4" pin style fixtures used for optical tooling alignment as well as laser tracker alignment. See picture

Deep Rod Monument (DRM)

DRM primarily used for vertical reference, this monument is a series of aluminum rods screwed together and driven into the earth unto refusal. The uppermost end of the rod is then measured with respect to a vertical datum in the area. This type of monument is installed as an outdoor, as well as an indoor means of vertical control. See picture

-F-

Fiducial

A device or mark that has been measured, and is known with respect to some other design point or location.

-G-

Geodesy

The geologic science of the size and shape of the earth

-K-

Kyjak Bolt

A hybrid of the Dijak Bolt having a concave surface, with a magnet to hold a 1.5" sphere. See picture

-L-

Laser Tracker (Tracker)

A Laser Tracker is a device that makes 3-D measurements, capable of very high accuracy, and is used in setting up control networks, measuring / referencing components, and final alignment of components in the beam lines. Trackers use a laser distance meter, two precision encoders and sophisticated proprietary software to calculate, store and display the 3-D position of a mirrored target (SMR or BMR or Retro probe). A beam steering system senses movement of the mirrored target and directs two servomotors to track the target. The tracker follows the mirrored target over features, updating the position at a rate of 1,000 times per second. The abundance of data collected yields good statistical redundancy, permitting excellent accuracy and repeatability. See picture

-M-

Mekometer (Meko)

"ME5000" distance measuring instrument design by Kern, a Switzerland based instrument company. See picture

Metrology

The science that deals with measurement. A system of measurement.

Meterology (Mets)

Mets is short for "meteorology" information. Temperature, humidity, and barometric pressure affect different elements and need to be considered for accurate measurement results.

-N-

N3 Level

An optical instrument used to measure a point along a vertical plane with gravity as a reference. See picture

-O-

Optical square

A way to set up instruments, where the lines of sight are parallel, and perpendicular to each other. See picture

-R-

Rod

A measuring stick or a leveling rod. See picture

-S-

Spherically Mounted Reflector (SMR)

SMR also known as a Ball Mounted Reflector (BMR) used with a laser-producing instrument to measure distance and angles from a known reference network of control points. See picture

-T-

Theodolite

A surveying instrument used to measure horizontal and vertical angles with a small telescope that can move in horizontal and vertical planes.

Tierod

I device typically installed in a concrete wall that is used as a known reference point for a vertical measurement. These also have a horizontal, and stationing value that can also be used. See picture

Transit

An instrument or tool used for measurement, similar to a theodolite, that measures horizontal and vertical angles.

-V-

V-Stars

A system of measurement designed by "Geodetic Services" in industrial photogrammetry. This system uses digital camera, specialized software, and light reflecting targeting to make measurements using triangulation. See picture

-W-

Wyteface scale

A "scale" marked off with inches, and tenths of inches, having a white face, with black markings, on hardened tool steel. These come in 3", 10" 20" and 40" lengths. Also have been cutoff to desired length for specific jobs. These are a valuable component of the optical tooling process. See picture

-X-

X

The horizontal component value of a point.

-Y-

Y

The distance along a line, sometimes known as stationing along the beam.

-Z-

Z

The vertical component value of a point.