Abstract
Frequency response is a key parameter in understanding the impact of a transducer on a measurement. A single volts-per-pascal value is often cited as an acoustic transducer’s response; however, the magnitude and phase of this ratio over the entire frequency range of interest is required to understand the effects of that transducer on input waveforms. While this ratio can be determined by comparison to a reference transducer, any reference must itself be calibrated in some fashion. The National Center for Physical Acoustics has built two calibration chambers designed for evaluation of infrasound microbarometers. The large interior volume (about 1.5 cubic meters) allows simultaneous testing of several microbarometers and reference transducers. These chambers are also equipped with two drivers—10-in. subwoofers—so that two-tone linearity testing can be done. The incorporation of two drivers opens the possibility for implementing reciprocity calibration, a well-established primary calibration methodology. This paper describes development, evaluation, and uncertainties of a reciprocity-based calibration procedure designed expressly for measuring the complex frequency response of infrasound sensors in the 0.005 to 10 Hz frequency range.
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