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JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 85, NO. C5, PAGES 2779–2786, 1980

The Dynamic Response of Glass Rod Thermistors

M. C. Gregg

Department of Oceanography and Applied Physics Laboratory University of Washington, Seattle, Washington 98105


T. B. Meagher

Department of Oceanography and Applied Physics Laboratory University of Washington, Seattle, Washington 98105


Abstract

The dynamic response characteristics of 0.4-mm-diameter glass rod thermistors, which are used frequently in fast-response CTD and microstructure instruments, have been determined over the speed range of 0.08–3.8 m/s. The spectral transfer function was obtained by firing the probes through a thin plume and then comparing the power spectrum of the shot data with that of a slow-speed map of the plume. The spectral transfer functions are described accurately by a two-pole filter for frequencies less than 25 Hz, although a single-pole form is an equally good representation for less than 10 Hz, The frequency of the ½-power (3-dB) attenuation point scales as U ⅓. Although the spectral forms and velocity scaling of the responses of the different probes tested are the same, the levels show significant differences due to irregularities in the glass coatings around the thermistor material.

Received 25 September 1979; accepted 11 January 1980.

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Citation: Gregg, M. C., and T. B. Meagher (1980), The Dynamic Response of Glass Rod Thermistors, J. Geophys. Res., 85(C5), 2779–2786.