SPINNING-WIRE DENSIMETER DEVELOPMENT.
Final rept. 17 Oct 66-31 Aug 69,
HONEYWELL INC ST PAUL MINN RESEARCH DEPT
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Analytical studies indicate that the Spinning-Wire Densimeter approach to density measurement is viable. The sensor consists of a wire drag element with a solar-sensor-modulated miniature 1680-MHz transmitter located at its center. A rotation rate of approximately 1000 radsec is given to the sensor as it nears the rockets apogee. It is then ejected and allowed to free fall. Its spindown rate is a measure of atmospheric density. Error analyses show that, with a receiver output signal-to-noise ratio of 60 db, the maximum density error with the present sensor design is about 30 percent for a 450,000-foot apogee and about 3 percent with a 400,000-foot apogee. Gyroscopic righting effects, electric field and plasma sheath effects do not produce significant torques on the sensor. However, an additional error results if no correction is made for dimensional variations. Author
- Test Facilities, Equipment and Methods