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  • 1
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    Liquid Level Sensing System (2014)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A liquid level sensing system includes waveguides disposed in a liquid and distributed along a path with a gap between adjacent waveguides. A source introduces electromagnetic energy into the waveguides at a first end of the path. A portion of the electromagnetic energy exits the waveguides at a second end of the path. A detector measures the portion of the electromagnetic energy exiting the second end of the path.
    Keywords: Instrumentation and Photography
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Fiber optic liquid mass flow sensor and method (2010)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A method and apparatus are provided for sensing the mass flow rate of a fluid flowing through a pipe. A light beam containing plural individual wavelengths is projected from one side of the pipe across the width of the pipe so as to pass through the fluid under test. Fiber optic couplers located at least two positions on the opposite side of the pipe are used to detect the light beam. A determination is then made of the relative strengths of the light beam for each wavelength at the at least two positions and based at least in part on these relative strengths, the mass flow rate of the fluid is determined.
    Keywords: Fluid Mechanics and Thermodynamics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Comparison of the Effects of using Tygon Tubing in Rocket Propulsion Ground Test Pressure Transducer Measurements (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper documents acoustics environments data collected during liquid oxygen- ethanol hot-fire rocket testing at NASA Marshall Space Flight Center in November- December 2003. The test program was conducted during development testing of the RS-88 development engine thrust chamber assembly in support of the Orbital Space Plane Crew Escape System Propulsion Program Pad Abort Demonstrator. In addition to induced environments analysis support, coincident data collected using other sensors and methods has allowed benchmarking of specific acoustics test measurement methodologies during propulsion tests. Qualitative effects on data characteristics caused by using tygon sense lines of various lengths in pressure transducer measurements is discussed here.
    Keywords: Acoustics
    Type: AIAA Paper 2005-4089 , 41st AIAA Joint Propulsion Conference; Jul 11, 2005 - Jul 15, 2005; Tucson, AZ; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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