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Frequency response calibration of recess-mounted pressure transducersA technique is described for measuring the frequency response of pressure transducers mounted inside a model, where a narrow pipette leads to an orifice at the surface. An acoustic driver is mounted to a small chamber which has an opening at the opposite end with an O-ring seal to place over the orifice. A 3.18 mm (1/8 inch) reference microphone is mounted to one side of the chamber. The acoustic driver receives an input of white noise, and the transducer and reference microphone outputs are compared to obtain the frequency response of the pressure transducer. Selected results are presented in the form of power spectra for both the transducer and the reference, as well as the amplitude variation and phase shift between the two signals as a function of frequency. The effect of pipette length and the use of this technique for identifying both blocked orifices and faulty transducers are described.
Document ID
19910012521
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Marcolini, M. A. (NASA Langley Research Center Hampton, VA., United States)
Lorber, P. F. (NASA Langley Research Center Hampton, VA., United States)
Miller, W. T., Jr. (NASA Langley Research Center Hampton, VA., United States)
Covino, A. F., Jr. (United Technologies Research Center East Hartford, CT., United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1991
Subject Category
Acoustics
Report/Patent Number
NAS 1.15:104031
NASA-TM-104031
Meeting Information
Meeting: International Instrumentation Symposium
Location: San Diego, CA
Country: United States
Start Date: May 5, 1991
End Date: May 9, 1991
Accession Number
91N21834
Funding Number(s)
PROJECT: RTOP 505-63-51
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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