Title :
Evaluation of deep sea tide gauge sensors
Author :
Snodgrass, Frank E. ; Wimbush, Mark
Author_Institution :
Inst. of Geophys. & Planetary Phys., Univ. of California, San Diego, La Jolla, CA, USA
Abstract :
A deep sea recording capsule carrying two quartz-crystal pressure sensors and two quartz-crystal temperature sensors was operated in 2.2 km depth off Brest during November-December 1973 as part of an inter national deep sea tide gauge intercalibration experiment. The dual instrumentation provides information for in situ evaluation of instrument calibrations. Differences in the recordings give estimates of the instrumental noise spectra. Instrumental noise of the temperature-corrected pressure sensor was found to be 10-20 db below the sea level continuum spectrum at frequencies below 0.2 cph. At higher frequencies the pressure signal-to-noise ratio decreased to 0-6 db at 3 cph (the Nyquist). The temperature sensor noise spectrum was everywhere 20-40 db below the signal spectrum. Problems associated with using dual instrumentation to evaluate sensor performance are discussed.
Keywords :
calibration; oceanographic equipment; pressure sensors; quartz; temperature sensors; tides; deep sea recording capsule; deep sea tide gauge sensors; dual instrumentation; instrument calibrations; instrumental noise spectra; international deep sea tide gauge intercalibration experiment; pressure signal-to-noise ratio; quartz-crystal pressure sensors; quartz-crystal temperature sensors; sea level continuum spectrum; sensor performance; signal spectrum; temperature sensor noise spectrum; temperature-corrected pressure sensor; Acoustic sensors; Aluminum; Batteries; Contacts; Fasteners; Frequency; Instruments; Marine vehicles; Monitoring; Pulse amplifiers;
Conference_Titel :
Engineering in the Ocean Environment, Ocean '74 - IEEE International Conference on
Conference_Location :
Halifax
DOI :
10.1109/OCEANS.1974.1161354
