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  • Comparison of a WFPC2 Thermal Vacuum Globular Cluster-Mask Image to Wfpc1
    Right panel: Real image taken with the Wide Field/Planetary Camera-2 of a "globular duster " pinhole mask in the April 1993 WFPC2 Thermal Vacuum test at JPL (Pasadena, CA). The image is a 80 sec exposure through the F555W ( "V ") filter about 40x34 " on a side, and approximates closely what
  • Low Outgassing Accelerometers and Cables for Thermal Vacuum and Vibration Test Environments
    become impossible to remove the accelerometers. Sensors installed. for ground vibration testing may therefore remain on the structure even if they are no longer. needed for testing purposes. In any application involving a thermal vacuum environment care must be taken to select the. proper
  • What is a Thermal or Temperature Test?
    to purposely induce failures to determine weak points or latent defects. What is thermal vacuum testing?
  • What designers should know about Thermal Analysis
    but the chip surrounded by a thermal-resistance layer runs hotter. Reflector and light bulb are exposed to vacuum. The yellow side of housing is exposed to air. The blue side is exposed to vacuum. The arrow points to a sensor in a coffee pot. Coffee temperature oscillates as the heater (not shown) cycles
  • Beware Thermal Cycling in BioProcessing Part One
    and seat and are part of the basic design of the valve. They are dynamic seals and must retain leak-tight performance during and after both mechanical and thermal cycling. Stem seals are intended to prevent leaks into or out of containment. Leaks are driven by pressure and proceed from a high-pressure
  • The Effect of Mounting Technique on the Microstructure of Thermal Barrier Coating (TBC) (.pdf)
    The characterization of a thermal barrier coating (TBC) using routine metallographic methods has has investigators uncertain as to the authenticity of the microstructure concerning porosity, cracking and other features. Mounting is a very important step in the process. A greater understanding
  • Thermal Stability and Radiation Resistance of Sm-Co based permanent magents
    We will review in this paper the recent data on thermal stability and radiationresistance of rare earth permanent magnets. Scanning electron microscopy analysis suggests that the affected surface layer of SmCo magnets is almost undetectable (less than 1 micron) after exposure to a temperature lower
  • Cryogenic Vacuum Insulation for Vessels and Piping
    Cryogenic vacuum insulation systems, with proper materials selection and execution, can offer the highest levels of thermal performance. Three areas of consideration are vital to achieve the optimum result: materials, representative test conditions, and engineering approach for the particular
  • Understanding Power Losses in Vacuum Furnaces
    Since the early development of the vacuum furnace, engineers and thermal experts have. continually tried to improve the insulating characteristics of the furnace hot zone. Several materials have been used for different applications with varying success. However, all designs must still deal
  • Seaming Technique for Chemically Resistant, Reusable, Vacuum Bag Material
    excellent thermal stability, flexibility, conformability and release properties. However, in spite of these positive characteristics, aggressive resins will absorb into the silicone polymer matrix in the uncured state and, upon curing, the vacuum bag becomes brittle. Furthermore, this process results

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