Development of Testing Fixture for Space Borne Optical Component Measurement
Prasanna R1, Rammohan Y. S2, Venkateswaran R3, CH Satyaprasad4

1Prasanna R, Student, M.Tech. Department of Product Design and Manufacturing, Industrial Engineering & Management, BMS College of Engineering, VTU, Bangalore, India.
Dr. Rammohan Y.S, Associate Professor, Department of Mechanical Engineering, BMS College of Engineering, VTU, Bangalore (Karnataka), India.
3Venkateswaran R, Scientist Engr G, LEOS ISRO, Bangalore (Karnataka), India.
4Satyaprasad CH, Scientist Engr SE, LEOS ISRO, Bangalore (Karnataka), India.
Manuscript received on 14 August 2017 | Revised Manuscript received on 20 August 2017 | Manuscript Published on 30 August 2017 | PP: 17-20 | Volume-6 Issue-12, August 2017 | Retrieval Number: L24590861217/17©BEIESP
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Abstract: This paper presents the process of design and development of testing fixture for measuring linear and angular errors in semi-finished optical components that are used in space born telescopes.. The telescopes used in earth observation satellites have reflective optical systems or refractive optical systems. Reflective optical systems consist of large size mirrors and refractive systems consist of multi element lens assemblies. Refractive telescope consists of multiple lens elements which have to be fabricated and positioned accurately to get the required image quality. Fabrication of lens elements is a critical process and various parameters have to be measured and controlled accurately during the course of their fabrication. Tilt and decenter of the lens surfaces are two such critical parameters that have to be controlled within few microns. A testing fixture is developed to measure these errors to an accuracy of 20 microns in the lens elements during their fabrication with minimum measurement time.
Keywords: Angular & Linear Error, High Accuracy, Measurement, Semi-Finished Space Borne Optical Component.

Scope of the Article: Measurement & Performance Analysis