LabVIEW calibration linearity visualization for precision sensors used in shaping control of a segmented reflector test bed

Abstract

A large, segmented space telescope requires high precision and accuracy in its mirror shape to obtain clear images. In order for control of such complex structures to be achieved to high precision and accuracy, it is important for sensing equipment involved in shape control to be constantly checked for deviations from their required calibration. The Segmented Space Telescope Testbed at the Structures, Propulsion, and Control Engineering (SPACE) Laboratory at California State University, Los Angeles, utilizes segmented mirror panels and a network of 42 sensors to mimic a monolithic paraboloid mirror shape to high accuracy and precision. For such a high precision system, regular checking of sensor calibration is crucial to performance. This paper describes a LabVIEW — based visualization subsystem that has been implemented and used for sensor calibration of the SPACE Testbed. The subsystem allows for linearity check for each sensor. In addition, the visualization subsystem provides a real-time means of system monitoring. The visualization also reduces the time to check all 42 sensors while at the same time improve the precision and accuracy of the measurements. By reducing the time required, it is easier to verify sensor linearity at regular interval.