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  • 1
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    Improved Fiber-Optic-Coupled Pressure And Vibration Sensors (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Improved fiber-optic coupler enables use of single optical fiber to carry light to and from sensor head. Eliminates problem of alignment of multiple fibers in sensor head and simplifies calibration by making performance both more predictable and more stable. Sensitivities increased, sizes reduced. Provides increased margin for design of compact sensor heads not required to contain amplifier circuits and withstand high operating temperatures.
    Keywords: PHYSICAL SCIENCES
    Type: LAR-15084 , Laser Tech. Brief.; 2; 4; P. 106
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    System Measures Thermal Noise In A Microphone (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Vacuum provides acoustic isolation from environment. System for measuring thermal noise of microphone and its preamplifier eliminates some sources of error found in older systems. Includes isolation vessel and exterior suspension, acting together, enables measurement of thermal noise under realistic conditions while providing superior vibrational and accoustical isolation. System yields more accurate measurements of thermal noise.
    Keywords: PHYSICAL SCIENCES
    Type: LAR-14567 , NASA Tech Briefs (ISSN 0145-319X); 18; 11; P. 60
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Improved Calibration Of Acoustic Plethysmographic Sensors (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Improved method of calibration of acoustic plethysmographic sensors involves acoustic-impedance test conditions like those encountered in use. Clamped aluminum tube holds source of sound (hydrophone) inside balloon. Test and reference sensors attached to outside of balloon. Sensors used to measure blood flow, blood pressure, heart rate, breathing sounds, and other vital signs from surfaces of human bodies. Attached to torsos or limbs by straps or adhesives.
    Keywords: PHYSICAL SCIENCES
    Type: LAR-14977 , NASA Tech Briefs (ISSN 0145-319X); 17; 10; P. 28
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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