803-CP Invar Kit for Photogrammetry
English unit kit with retroreflective targets
Invar tubing is great for metrology because it has such a very low coefficient of thermal expansion, which effectively eliminates changes in length due to handling or environmental changes.
The Invar tubing in the 803-CP is manufactured to its stated length within ±0.0001″. In addition, the Invar tubing components are hand-picked for each kit so that the total stackup error does not exceed 0.0005″. This means that you can connect all of the tubes found in a given kit together end-to-end, and the stack will maintain the total length within the stackup error. (The table above right summarizes this information.) We often recommend the 803-CP when people ask for a calibration or scaling-quality type system.
Individual components may be assembled to produce lengths from 2″ to 112″, in 5″ increments. The table below specifies all included components.
803-CP Invar Kit Components
|A||12587-20IN||20″ Invar tube||4|
|12587-10IN||10″ Invar tube||2|
|12587-5IN||5″ Invar tube||2|
|B||15483-1||Retroreflective target; 1/4″ dot, 1″ offset||4|
|C||15484-1||Target holder; 1″ offset||4|
|D||12406-G1||Stainless steel connectors||10|
|n.a.||n.a.||NIST traceable certification for kit||yes|
Kit and case, 17 lbs.
Shipping, 22 lbs.
Thermal expansion coefficient:
0.70×10−6 in./in./°F for temperature range of 0°F to 200°F
1″ diameter Invar with stainless steel end caps, having 3/8″-24 internal threads on each end
Finish: Oil and stain resistant PVC jacket, red
Case: Plastic case with foam insert