United States of America As Represented by the Administrator of Nasa

The United States of America As Represented by the Administrator of the

John J Chapman

Qamar A Shams

William T Powers

Nancy M Holloway

Purnell Hopson, Jr

Timothy D Schott

Louis J Glaab

Charles T Howell

Vincent J Fleck

A system and method for flight training and evaluation of pilots comprises electronically activated vision restriction glasses that detect the pilot's head position and automatically darken and restrict the pilot's ability to see through the front and side windscreens when the pilot-in-training attempts to see out the windscreen. Thus, the pilot-in-training sees only within the aircraft cockpit, forcing him or her to fly by instruments in the most restricted operational mode.

Variably transmittive, electronically-controlled eyewear

A miniature, multi-channel, electronically scanned pressure measuring device uses electrostatically bonded silicon dies in a multi-element array. These dies are bonded at specific sites on a glass, pre-patterned substrate. Thermal data is multiplexed and recorded on each individual pressure measuring diaphragm. The device functions in a cryogenic environment without the need of heaters to keep the sensor at constant temperatures.

Multi-channel electronically scanned cryogenic pressure sensor and method for making same

A pressure sensor is provided for cryogenic, high pressure applications. A highly doped silicon piezoresistive pressure sensor is bonded to a silicon substrate in an absolute pressure sensing configuration. The absolute pressure sensor is bonded to an aluminum nitride substrate. Aluminum nitride has appropriate coefficient of thermal expansion for use with highly doped silicon at cryogenic temperatures. A group of sensors, either two sensors on two substrates or four sensors on a single substrate are packaged in a pressure vessel.

Cryogenic, absolute, high pressure sensor

Cryogenic high pressure sensor module

A silicon pressure die is bonded to a borosilicate substrate above a pneumatic port. A Wheatstone bridge circuit is formed on the silicon pressure die and has bridge elements of silicon doped with boron to a deposit density level of approximately 1.times.10.sup.19 -10.sup.21 boron/cm.sup.3. A current source is provided to excite the Wheatstone bridge circuit. In addition, a temperature sensor is provided to provide temperature readings.

Pressure transducer and system for cryogenic environments

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Ware Neck, VA, United States of America

John J Chapman