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Air-Sea Interaction: Instruments and Methods by F. Dobson, L. Hasse, R. Davis

By F. Dobson, L. Hasse, R. Davis

During the prior decade, man's centuries-old curiosity in marine me­ teorology and oceanography has broadened. Ocean and surroundings are actually taken care of as coupled components of 1 process; the ensuing curiosity in air-sea interplay difficulties has ended in a swift progress within the sophistication of tools and size concepts. This publication has been designed as a reference textual content which describes, albng with the tools themselves, the accrued functional experi­ ence of specialists engaged in box observations of air-sea interac­ tions. it really is intended to complement instead of exchange manuals on usual regimen observations or instnunentation handbooks. on the inception a textbook was once deliberate, which might include basically good proven tools and tools. It used to be fast stumbled on that for the booklet to be worthy many units and strategies must be integrated that are nonetheless evolving speedily. The reader is for this reason advised to take not anything in those pages with no consideration. definitely, each contributor is a professional, yet whereas a few are again­ ed up through generations of released paintings, others are pioneers. the alternative of subject matters, after all, is arguable. the kinds of observa­ tions integrated will not be exhaustive and subject matters comparable to marine aero­ sols and radio-tracers are passed over, as was once the overall topic of distant sensing, which used to be felt to be too wide and evol ving too swiftly. the rule followed in proscribing dimension used to be greatest use­ fulness to 'a knowledgeable experimentalist new to the field'.

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Extra resources for Air-Sea Interaction: Instruments and Methods

Sample text

This principle of 'optical heterodyning' has been the basis for most methods evolved since then. Figure 11 shows the principles of one of the most used configurations. Only measurements performed on very high speed flows allow for a direct optical determination of the frequency shift. An alternative system is the 'time-of-flight' laser anemometer based on the time of flight between two small volumes in space of either single particles or particle patterns. It has been shown by Lading (1976) that this principle is closely related to the Doppler method, and that the same very good space-time resolution can be obtained - in some cases even better.

1976. Comments on development and use of the Gill UVW anemometer. ogy, 10: 515-516. WIERINGA, J. 1967. Evaluation and design of wind vanes. JouY'nal. ogy, 6: 1114-1122. WIERINGA, J. 1972. Tilt errors and precipitation effects in trivane measurements of turbulent fluxes over open water. ogy, 2: 406-426. T. A. LYNCH. 1974. Cup anemometer dynamics. PY'oceedings of the InstY'ument Society of AmeY'ica, Pittsburgh, Pennsylvania, 10-14 May, 1971, 1: 701-708. YEH, Y. Z. CUMMINS. 1964. Localized flow with a He-Ne laser spectrometer.

Scattered light from particles passing the two focal volumes is collected and detected in the receiver. As in l<'igure 11, the transmitter and receiver may have a common optical axis either in a forward- or back-scattering configuration. CUPS, VANES, PROPELLERS 41 the specific circumstances, that is, on particle concentration, scattered light power, layout of the optical system and, of course, on what kind of velocity information is required. From a fluid mechanical point of view, the processors can be categorized into three groups: (1) The first group essentially give a continuous output of which the expected value is proportional to the instantaneous velocity (George and Lumley, 1973); the instrumental averaging time is much shorter than the integral time scale.

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