Advanced diagnostics for impact-flash spectroscopy on light-gas guns.

Breiland, William George ; Reinhart, William Dodd ; Miller, Paul Albert ; Brown, Justin L. ; Thornhill, Tom Finley, III (, ; ) ; Mangan, Michael A. ; Shaner, Eric Arthur ; Chhabildas, Lalit Chandra ; Grine, Albert D. ; Wanke, Michael Clement ; Alexander, C. Scott

关键词: DIAGNOSTIC TECHNIQUES;    SPACE VEHICLES;    IMPACT SHOCK;    MONITORING;    SENSORS;    DESIGN;    OPTICAL PROPERTIES Spectroscopy.;    Space debris.;    Sensors.;   

DOI  :  10.2172/903428
RP-ID  :  SAND2007-0835
PID  :  OSTI ID: 903428
Others  :  TRN: US200722%%52

学科分类：工程和技术（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

This study is best characterized as new technology development for implementing new sensors to investigate the optical characteristics of a rapidly expanding debris cloud resulting from hypervelocity impact regimes of 7 to 11 km/s. Our gas guns constitute a unique test bed that match operational conditions relevant to hypervelocity impact encountered in space engagements. We have demonstrated the use of (1) terahertz sensors, (2) silicon diodes for visible regimes, (3) germanium and InGaAs sensors for the near infrared regimes, and (4) the Sandia lightning detectors which are similar to the silicon diodes described in 2. The combination and complementary use of all these techniques has the strong potential of ''thermally'' characterizing the time dependent behavior of the radiating debris cloud. Complementary spectroscopic measurements provide temperature estimates of the impact generated debris by fitting its spectrum to a blackbody radiation function. This debris is time-dependent as its transport/expansion behavior is changing with time. The rapid expansion behavior of the debris cools the cloud rapidly, changing its thermal/temperature characteristics with time. A variety of sensors that span over a wide spectrum, varying from visible regime to THz frequencies, now gives us the potential to cover the impact over a broader temporal regime starting from high pressures (Mbar) high-temperatures (eV) to low pressures (mbar) low temperatures (less than room temperature) as the debris expands and cools.