Spherical-Coordinates Encoder Module

The spherical-coordinates encoder module (SCEM) is a relatively simple and inexpensive electromechanical apparatus for quickly and easily measuring three-dimensional offsets between objects at distances of the order of a few feet ( ≈1 m). The SCEM was developed specifically for measuring offsets between spacecraft payload trunnions and trunnion supports during ground-based payload-transfer operations; it could also be readily used, for example, to measure offsets to guide the maneuvering of large objects during the assembly of heavy machinery or structures. The SCEM eliminates the need for time-consuming, tedious, error-prone measurements by use of such tools as scales, tapes, and protractors, followed by equally tedious and error-prone manual calculations, manual recording of data, and verbal communication of data.