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Design and Application of Space-Based MEMS 337

TABLE 15.2
Various Environmental Pairs — Continued
Low Temperature and Shock Low Temperature and Low Temperature and
and Vibration Acceleration Explosive Atmosphere

Low temperature tends to This combination produces the Temperature has minimal effect
intensify the effects of same effect as low temperature on the ignition of an
shock and vibration. and shock and vibration. explosive atmosphere but
However, it is a does affect the air–vapor
consideration only at very ratio, which is an important
low temperatures. consideration.
Low Temperature and Ozone Humidity and Low Pressure Humidity and Particulate

Ozone effects are reduced at Humidity increases the effects of Sand and dust have a natural
lower temperatures but low pressure, particularly in affinity for water and this
ozone concentration relation to electronic or electrical combination increases
increases with equipment. However, primarily deterioration.
lower temperatures. the temperature determines the
actual effectiveness of this
combination.
Humidity and Shock and Humidity and Explosive
Humidity and Vibration Acceleration Atmosphere
This combination tends to The periods of shock and Humidity has no effect on the
increase the rate of acceleration are considered too ignition of an explosive
breakdown of short for these environments to atmosphere but a high
electrical material. be affected by humidity. humidity will reduce the
pressure of an explosion.

Low Pressure and Solar
Humidity and Ozone Humidity and Solar Radiation Radiation

Ozone meets with moisture to Humidity intensifies the This combination does not add
form hydrogen peroxide, deteriorating effects of solar to the overall effects.
which has a greater radiation on organic materials.
deteriorating effect on
plastics and elastomers than
the additive effects of
moisture and ozone.

Low Pressure and Shock or
Low Pressure and Particulate Low Pressure and Vibration Acceleration
This combination only occurs This combination intensifies These combinations only
in extreme storms during effects in all equipment become important at the
which small dust particles categories but mostly with hyperenvironment levels, in
are carried to high altitudes. electronic and electrical combination with high
equipment. temperature.
Continued

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