LONG DURATION EXPOSURE FACILITY （长时间接触设备）.pdfVIP

LONG DURATION EXPOSURE FACILITY--RESEARCH OPPORTUNITIES IN THE 1980s; William H. Kinard, James L. Jones, Jr., NASA Langley Research Center, Hampton, VA 23665 The first flight of the Long Duration Exposure Facility (LDEF), which is planned for launch late in 1983 and for recovery 1 year later, will accommodate approximately 50 experiments encompassing science, application, and technology disciplines. The second flight of the LDEF with a new set of experiments is anticipated shortly after the facility is retrieved from the first mission. This paper describes research opportunities with the LDEF in the mid-1980s. The LDEF is basically a cylindrical structure, 10 meters long and 5 meters in diameter, on which tray-mounted totally self-contained experiments are transported to, exposed in, and returned from space with the shuttle. The LDEF is 3-axis passively stabilized while free flying in space. The trays for experiments can accommodate 75Kg of hardware and they are approximately 1.5 meters long, 1 meter wide, with varying depths. The LDEF is tailored to provide low-cost opportunities for experiments which have modest needs for electrical power and dataprocessing and for experiments which benefit from postflight laboratory investigations of retrieved hardware. Many of the LDEF experiments are totally passive. Standard experiment power and data systems (EPDS) are available for experiments which do require power and data processing. The LDEF research opportunities can best be illustrated by describing typical experiments planned for the first mission. THE ELEMENTAL AND ISOTOPIC COMPOSITION OF THE INTERPLANETARY DUST: This com- pletely passive experiment is being developed by Robert Walker and Emst Zinner of Washington University, Hugo Fechtig and Norbert Pailer of the Max-Planck Institute, and E. Igenbergs of the University of Munich to trap ejecta of impacting dust particles in space for postflight laboratory