Design and fabrication of payload for OH emission experiment onboard Spacelab - A case study

Physics

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Design Analysis, Fabrication, Hydroxyl Emission, Spaceborne Experiments, Spacelab Payloads, Data Processing, French Space Program, Ground Support Equipment, Image Intensifiers, International Cooperation, Isro, Spaceborne Photography, Stress Analysis, Vibration Tests

Scientific paper

Design features of the ISRO-CNES experiment for photographing near-IR emissions in the earth's mesosphere during the first Spacelab mission are described. The instrument will be used to photograph waves in the mesosphere at around 85 km, targetting on the emissions from OH clouds in a region 10-15 km thick. The instrument contains a high gain image intensifier, a fast lens, a filter to form an image of the OH emission layer, and a filter for lower wavelength cutoff. Photocells will activate a mechanical shutter in the event of sunlight or lunar reflected light raising the illumination to dangerous levels. The instrument will be housed and mounted on a pallet to obtain a oblique view of the earth when the Orbiter is in an upside down configuration. The casings are made of an aluminum alloy, stainless steel, and 30 percent glass filled teflon.

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