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  • Other Sources  (3)
  • 1985-1989  (3)
  • 1987  (3)
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  • 1985-1989  (3)
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  • 1
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    In situ ozone instrumentation for 10-Hz measurements - Development and evaluation (1987)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The development of the fast-response ozone detector for the Electra aircraft is described. The selection of a technique to meet the design goal of 10-Hz detection is examined in terms of detection principles, instrument sampling parameters, signal conditioning, and aircraft and sampling environment. An instrument which employs a NO technique for detection of ozone with a reaction chamber volume of 16 cu cm, a pressure of 60 torr, and a sample flow of 1000 standard cu cm/min was developed. Laboratory and flight testings of the detector were conducted in order to evaluate its performance. The data reveal that the fast-response ozone detector is highly reliable with a response of 0.1 sec to 90 percent of reading, has a lower detection limit of 1 ppbv, and an S/N of 20 at 20 ppbv ozone.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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    NASA TECHNICAL REPORTS
  • 2
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    The development of an air motion measurement system for NASA's Electra aircraft (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The development of the Turbulent Air Motion Measurement System (TAMMS), which is to measure dynamical and photochemical processes over a wide range of spatial and temporal scales, is examined. The composition and operation of the TAMMS subsystems, which include (1) fast-response meteorological sensors; (2) a boom/inertial navigation system; (3) baseline meteorological sensors; (4) an analog/digital interface; (5) control and data acquisition; and (6) data/reduction and spectral analysis software, are described. The planned flight testing and calibration of the TAMMS are discussed. The TAMMS platform wil be able to estimate the turbulent fluxes of heat, moisture, momentum, and any chemical species for which fast-response instrumentation is available.
    Keywords: AIRCRAFT INSTRUMENTATION
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    NASA TECHNICAL REPORTS
  • 3
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    The use of a numerical filter to correct airborne temperature measurements for the effects of sensor lag (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A numerical filter for transforming measured temperature signals into a close approximation of the actual temperature signal is described. The filter is derived by minimizing the mean-square error of the system, and assuming a knowledge of the characteristics of the sensing element and its housing. The equation representing the frequency-response function of the numerical filter is given. Input and output spectra for a filter applied to a case with negligible noise and a noise level of 1.5 percent of the total power in the input spectrum are analyzed, and the numerical weights for these two cases are calculated. Phase angle and gain for the entire system are examined. It is noted that the filter can enhance spectral components as high as 8 Hz with little phase and gain degradation over the bandwidth.
    Keywords: AIRCRAFT INSTRUMENTATION
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    NASA TECHNICAL REPORTS
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