Abstract
Sierra Lobo successfully tested its patented Cryo‐Tracker® probe and mass gauging system in an Expendable Launch Vehicle (ELV) liquid oxygen tank simulation for NASA’s Launch Service Providers Directorate. The effort involved collaboration between Sierra Lobo, NASA Kennedy Space Center (KSC), and Lockheed Martin personnel. Testing simulated filling and expulsion operations of Lockheed Martin’s Atlas V liquid oxygen (LOX) tank and characterized the 10.06 m (33‐ft) Cryo‐Tracker’s performance.Sierra Lobo designed a 9.14 m (30‐ft) tall liquid nitrogen test tank to simulate the Atlas V LOX tank flow conditions and validate Cryo‐Tracker® data via other sensors and visualization. This test package was fabricated at Sierra Lobo’s Cryogenics Testbed at NASA KSC.All test objectives were met or exceeded. Key accomplishments include: fabrication of the longest Cryo‐Tracker® probe to date; installation technique proven with only two attachment points at top and bottom of tank; probe survived a harsh environment with no loss of signal or structural integrity; probe successfully measured liquid levels and temperatures under all conditions and successfully demonstrated its feasibility as an engine cut‐off signal.
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