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  • 11
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    Model attitude measurements at NASA Langley Research Center (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper describes the predominant instrumentation used to make precision model attitude measurements in wind tunnel testing at NASA Langley Research Center (LaRC). It covers all aspects of precision model attitude measurements: the type of sensors, testing and calibration, packaging preparation, signal conditioning, and user instructions. The paper concludes with descriptions of alternate methods to make precision model attitude measurements and future directions in this field.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 92-0763
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  • 12
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    An optical motion measuring system for laterally oscillated fatigue tests (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper describes an optical system developed for materials testing laboratories at NASA Langley Research Center (LaRC) for high resolution monitoring of the transverse displacement and angular rotation of a test specimen installed in an axial-tension bending machine (ATB) during fatigue tests. It consists of a small laser, optics, a motorized mirror, three photodiodes, electronic detection and counting circuits, a data acquisition system, and a personal computer. A 3-inch by 5-inch rectangular plate attached to the upper grip of the test machine serves as a target base for the optical system. The personal computer automates the fatigue test procedure, controls data acquisition, performs data reduction, and provides user displays. The data acquisition system also monitors signals from up to 16 strain gages mounted on the test specimen. The motion measuring system is designed to continuously monitor and correlate the amplitude of the oscillatory motion with the strain gage signals in order to detect the onset of failure of the composite test specimen. A prototype system has been developed and tested which exceeds the design specifications of +/- 0.01 inch displacement accuracy, and +/- 0.25 deg angular accuracy at a sampling rate of 100 samples per second.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 93-1560 , In: AIAA(ASME)ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 34th and AIAA/ASME Adaptive Structures Forum, La Jolla, CA, Apr. 19-22, 1993, Technical Papers. Pt. 4 (A93-33876 1; p. 2174-2183.
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  • 13
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    Effects of yaw and pitch motion on model attitude measurements (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report presents a theoretical analysis of the dynamic effects of angular motion in yaw and pitch on model attitude measurements in which inertial sensors were used during wind tunnel tests. A technique is developed to reduce the error caused by these effects. The analysis shows that a 20-to-1 reduction in model attitude measurement error caused by angular motion is possible with this technique.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-4641 , L-17381 , NAS 1.15:4641
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  • 14
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    High temperature skin friction measurement (1989)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: Skin friction measurement in the NASA Langley hypersonic propulsion facility is described. The sensor configuration utilized an existing balance, modified to provide thermal isolation and an increased standoff distance. For test run times of about 20 sec and ambient-air cooling of the test section and balance, the modified balance performed satisfactorily, even when it was subjected to acoustic and structural vibration. The balance is an inertially balanced closed-loop servo system where the current to a moving-coil motor needed to restore or null the output from the position sensor is a measure of the force or skin friction tending to displace the moving element. The accuracy of the sensor is directly affected by the position sensor in the feedback loop, in this case a linear-variable differential transformer which has proven to be influenced by temperature gradients.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ICIASF ''89; Sept. 18-21, 1989; Goettingen; Germany
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  • 15
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    A precision mechanical nerve stimulator (1988)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: An electromechanical device, used to apply and monitor stimulating pulses to a mammalian motor nerve, has been successfully developed at NASA Langley Research Center. Two existing force transducers, a flight skin friction balance and a miniature skin friction balance which were designed for making aerodynamic drag measurements, were modified and incorporated to form this precision instrument. The nerve stimulator is a type one servomechanism capable of applying and monitoring stimulating pulses of 0 to 10 grams with a precision of better than +/- 0.05 grams. Additionally, the device can be independently used to apply stimulating pulses by displacing the nerve from 0 to 0.25 mm with a precision of better than +/- 0.001 mm while measuring the level of the load applied.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; 5 p.
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  • 16
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    Fiber-Optic Differential Displacement Sensor (1996)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Dual fiber-optic sensor measures small relative displacements of two proximate objects along common surface. Dual sensor comprises two fiber-optic sensors in differential configuration increasing sensitivity to displacement while decreasing sensitivity to thermal expansion and contraction.
    Keywords: PHYSICAL SCIENCES
    Type: LAR-14241 , NASA Tech Briefs (ISSN 0145-319X); 20; 1; P. 26
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  • 17
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    Scanning Light Sheet Would Measure Deflection Of Beam (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Scanning-light-sheet apparatus designed to measure linear and angular displacement or deflection of structure. Intended specifically to measure deflection of beam-shaped truss structure. Includes conventional low-powered laser, lenses, mounts, single-axis optical scanner, several photodiodes, and electronic controller. Apparatus measures motion of structure and also used to determine positions, deflections, and velocities. Besides use in aerospace field, displacement measurements have many applications in construction-equipment and automotive industries.
    Keywords: ELECTRONIC SYSTEMS
    Type: LAR-14218 , NASA Tech Briefs (ISSN 0145-319X); 16; 12; P. 38
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  • 18
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    Surgical Force-Measuring Probe (1993)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Aerodynamic balance adapted to medical use. Electromechanical probe measures forces and moments applied to human tissue during surgery. Measurements used to document optimum forces and moments for surgical research and training. In neurosurgical research, measurements correlated with monitored responses of nerves. In training, students learn procedures by emulating forces used by experienced surgeons. Lightweight, pen-shaped probe easily held by surgeon. Cable feeds output signals to processing circuitry.
    Keywords: LIFE SCIENCES
    Type: LAR-14836 , NASA Tech Briefs (ISSN 0145-319X); 17; 9; P. 134
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  • 19
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    First International Symposium on Strain Gauge Balances (1999)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The first International Symposium on Strain Gauge Balances was sponsored and held at NASA Langley Research Center during October 22-25, 1996. The symposium provided an open international forum for presentation, discussion, and exchange of technical information among wind tunnel test technique specialists and strain gauge balance designers. The Symposium also served to initiate organized professional activities among the participating and relevant international technical communities. Over 130 delegates from 15 countries were in attendance. The program opened with a panel discussion, followed by technical paper sessions, and guided tours of the National Transonic Facility (NTF) wind tunnel, a local commercial balance fabrication facility, and the LaRC balance calibration laboratory. The opening panel discussion addressed "Future Trends in Balance Development and Applications." Forty-six technical papers were presented in 11 technical sessions covering the following areas: calibration, automatic calibration, data reduction, facility reports, design, accuracy and uncertainty analysis, strain gauges, instrumentation, balance design, thermal effects, finite element analysis, applications, and special balances. At the conclusion of the Symposium, a steering committee representing most of the nations and several U.S. organizations attending the Symposium was established to initiate planning for a second international balance symposium, to be held in 1999 in the UK.
    Keywords: Instrumentation and Photography
    Type: NASA/CP-1999-209101/PT2 , NAS 1.55:209101/PT2 , L-17809B , First International Symposium on Strain Gauge Balances; NASA/CP-1999-209101/PT2|International Symposium on Strain Gauge Balances; Oct 22, 1996 - Oct 25, 1996; Hampton, VA; United States
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  • 20
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    First International Symposium on Strain Gauge Balances (1999)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The first International Symposium on Strain Gauge Balances was sponsored and held at NASA Langley Research Center during October 22-25, 1996. The symposium provided an open international forum for presentation, discussion, and exchange of technical information among wind tunnel test technique specialists and strain gauge balance designers. The Symposium also served to initiate organized professional activities among the participating and relevant international technical communities. Over 130 delegates from 15 countries were in attendance. The program opened with a panel discussion, followed by technical paper sessions, and guided tours of the National Transonic Facility (NTF) wind tunnel, a local commercial balance fabrication facility, and the LaRC balance calibration laboratory. The opening panel discussion addressed "Future Trends in Balance Development and Applications." Forty-six technical papers were presented in 11 technical sessions covering the following areas: calibration, automatic calibration, data reduction, facility reports, design, accuracy and uncertainty analysis, strain gauges, instrumentation, balance design, thermal effects, finite element analysis, applications, and special balances. At the conclusion of the Symposium, a steering committee representing most of the nations and several U.S. organizations attending the Symposium was established to initiate planning for a second international balance symposium, to be held in 1999 in the UK.
    Keywords: Instrumentation and Photography
    Type: NASA/CP-1999-209101/PT1 , L-17809A , NAS 1.55:209101/PT1 , First International Symposium on Strain Gauge Balances; NASA/CP-1999-209101/PT1|Oct 22, 1996 - Oct 25, 1996; Hampton, VA; United States
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