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  • 1
    Electronic Resource
    Electronic Resource
    Estimating bias error distributions (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 3561-3571 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In this article we formulate a general methodology for estimating the bias error distribution of a device in a measurement domain from less accurate measurements when a minimal number of standard values (typically no more than two values) are available. A new perspective is that the bias error distribution can be found as a solution of an intrinsic functional equation in a domain. Based on this theory, the scaling- and translation-based methods for determining the bias error distribution are developed. These methods are applicable to virtually any device as long as the bias error distribution of the device can be sufficiently described by a power series (a polynomial) or a Fourier series in a domain. These methods were validated through computational simulations and laboratory calibration experiments for a number of different devices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1394188
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    Paper (German National Licenses)
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  • 2
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    Estimating bias error distributions (2001)
    American Institute of Physics
    Details
    Publication Date: 2001-09-01
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 3
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    Summary Report of the First International Symposium on Strain Gauge Balances and Workshop on AoA/Model Deformation Measurement Techniques (1998)
    In:  CASI
    Details
    Publication Date: 2011-10-14
    Description: The first International Symposium on Strain Gauge Balances was sponsored under the auspices of the NASA Langley Research Center (LaRC), Hampton, Virginia. Held at the LaRC Reid Conference Center, 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. The program included a panel discussion, technical paper sessions, tours of local facilities, and vendor exhibits. Over 130 delegates were in attendance from 15 countries. A steering committee was formed to plan a second international balance symposium tentatively scheduled to be hosted in the United Kingdom in 1998 or 1999. The Balance Symposium was followed bv the half-day, Workshop on Angle of Attack and Model Deformation on the afternoon of October 25. The thrust of the Workshop was to assess the state of the art in angle of attack (AoA) and model deformation measurement techniques and to discuss future developments.
    Keywords: Instrumentation and Photography
    Format: text
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  • 4
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    An improved calibration technique for wind tunnel model attitude sensors (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Aerodynamic wind tunnel tests at NASA Langley Research Center (LaRC) require accurate measurement of model attitude. Inertial accelerometer packages have been the primary sensor used to measure model attitude to an accuracy of +/- 0.01 deg as required for aerodynamic research. The calibration parameters of the accelerometer package are currently obtained from a seven-point tumble test using a simplified empirical approximation. The inaccuracy due to the approximation exceeds the accuracy requirement as the misalignment angle between the package axis and the model body axis increases beyond 1.4 deg. This paper presents the exact solution derived from the coordinate transformation to eliminate inaccuracy caused by the approximation. In addition, a new calibration procedure is developed in which the data taken from the seven-point tumble test is fit to the exact solution by means of a least-squares estimation procedure. Validation tests indicate that the new calibration procedure provides +/- 0.005-deg accuracy over large package misalignments, which is not possible with the current procedure.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: In: International Instrumentation Symposium, 39th, Albuquerque, NM, May 2-6, 1993, Proceedings (A93-54351 24-35); p. 89-102.
    Format: text
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  • 5
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    Summary Report of the First International Symposium on Strain Gauge Balances and Workshop on AoA/Model Deformation Measurement Techniques (1999)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The first International Symposium on Strain Gauge Balances was sponsored under the auspices of the NASA Langley Research Center (LaRC), Hampton, Virginia during October 22-25, 1996. Held at the LaRC Reid Conference Center, 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. The program included a panel discussion, technical paper sessions, tours of local facilities, and vendor exhibits. Over 130 delegates were in attendance from 15 countries. A steering committee was formed to plan a second international balance symposium tentatively scheduled to be hosted in the United Kingdom in 1998 or 1999. The Balance Symposium was followed by the half-day Workshop on Angle of Attack and Model Deformation on the afternoon of October 25. The thrust of the Workshop was to assess the state of the art in angle of attack (AoA) and model deformation measurement techniques and to discuss future developments.
    Keywords: Instrumentation and Photography
    Type: First International Symposium on Strain Gauge Balances; Pt. 2; 727-738; NASA/CP-1999-209101/PT2
    Format: application/pdf
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  • 6
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    Preliminary Calibration Report of an Apparatus to Measure Vibration Characteristics of Low Frequency Disturbance Source Devices (1994)
    In:  CASI
    Details
    Publication Date: 2018-06-12
    Description: This report presents a description of the test apparatus and the method of testing the low frequency disturbance source characteristics of small pumps, fans, camera motors, and recorders that are typical of those used in microgravity science facilities. The test apparatus will allow both force and acceleration spectra of these disturbance devices to be obtained from acceleration measurements over the frequency range from 2 to 300 Hz. Some preliminary calibration results are presented.
    Keywords: Electronics and Electrical Engineering
    Type: Joint Launch + One Year Science Review of USML-1 and USMP-1 with the Microgravity Measurement Group, Volume 2; 921-933; NASA-CP-3272-Vol-2
    Format: application/pdf
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  • 7
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    A noncontacting motion monitoring system for an astronaut translation aid (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The development of a noncontacting motion sensing system designed to monitor the movement of a cart along a track in the low earth orbit space environment is described. The system uses Hall effect sensors to detect the position of small permanent magnets located along the track. The measurement criteria are described, the system design is discussed, and estimates of the system error are given. The system will be used on the Crew and Equipment Translation Aid (CETA) experiment scheduled for the STS37 flight in November 1990. It will allow the position, velocity, and acceleration of the cart to be determined as it moves along the track.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-102640 , NAS 1.15:102640
    Format: application/pdf
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  • 8
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    Enhanced reduction of velocity data obtained during CETA flight experiment (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A newly developed technique for enhanced data reduction provides an improved procedure that allows least squares minimization to become possible between data sets with an unequal number of data points. This technique was applied in the Crew and Equipment Translation Aid (CETA) experiment on the STS-37 Shuttle flight in April 1991 to obtain the velocity profile from the acceleration data. The new technique uses a least-squares method to estimate the initial conditions and calibration constants. These initial conditions are estimated by least-squares fitting the displacements indicated by the Hall-effect sensor data to the corresponding displacements obtained from integrating the acceleration data. The velocity and displacement profiles can then be recalculated from the corresponding acceleration data using the estimated parameters. This technique, which enables instantaneous velocities to be obtained from the test data instead of only average velocities at varying discrete times, offers more detailed velocity information, particularly during periods of large acceleration or deceleration.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-4460 , L-17168 , NAS 1.15:4460
    Format: application/pdf
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  • 9
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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
    Format: text
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  • 10
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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
    Format: application/pdf
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