Abstract
An improved sensor and calibration techniques for the measurement of infrasonic and gravity waves are described. The sensor is a modified, Moore sailplane rate-of-climb indicator, which produces a linear electrical output for pressures between 103 and 10−2 dynes/cm2, with a flat frequency response between 22 and 0.001 cps. It is a stable instrument, light and easily adapted for balloon payloads and other field experimentation. The calibration techniques provide controlled sinusoidal pressure at various simulated altitudes and atmospheric temperatures. Several present and future applications of the techniques are discussed, as well as some of the methods used in these applications to effectively control wind, temperature, ground motion, and other extraneous noise sources.
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