Reference Prism
The reference prism has a regular cube structure. Angular errors between adjacent faces are typically controlled within 2~5', and 3-5 adjacent faces have reflective coatings and crosshair markings. During spacecraft development, an electronic theodolite measures the normals of its reflecting faces to establish a cube-mirror coordinate system that accurately represents the product's spatial position. The K9 optical-glass substrate has properties suited to precision optics: high transmission across 350nm-2000nm, high hardness to withstand various physical and chemical stresses, and low bubble and impurity content. It is therefore widely used as a substrate for precision optical components. Standard reference-prism sizes are 8mm, 10mm, and 15mm; customized products are available to meet specific requirements.
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