Exoatmospheric calibration sphere
First Claim
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1. A space-based calibration source including support electronics for medium-wave and long-wave infrared sensors having electronics therein for providing range measurements and surface temperature measurements comprising:
- a. a pair of spherical members disposed in substantially concentric, spaced relation to form an annular space therebetween; and
b. heat pipe means disposed in said annular space forming an integral, bi-directional structure for minimizing surface temperature gradients on said calibration source.
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Abstract
A sphere which provides a high emissivity, uniform, isothermal calibrationource which is fully instrumented for surface temperature and range measurements. The characteristics are achieved by using high thermal conductivity copper hemispheres disposed in spaced, concentric relation and containing a distributed heat pipe therebetween to minimize surface temperature gradients.
12 Citations
9 Claims
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1. A space-based calibration source including support electronics for medium-wave and long-wave infrared sensors having electronics therein for providing range measurements and surface temperature measurements comprising:
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a. a pair of spherical members disposed in substantially concentric, spaced relation to form an annular space therebetween; and b. heat pipe means disposed in said annular space forming an integral, bi-directional structure for minimizing surface temperature gradients on said calibration source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification