Eddy-sonic method

The major advantage of the method is that no liquid energy compliant is needed, because air serves as a satisfactory coupling medium. The eddy-sonic method is useful for detecting both near-side and far-side unbonds in thin honeycomb structures. It can also be used to detect crushed core, fractured core, and voids in the adhesive. 

The flux-profile relationships utilized above crop fields and grasslands (cf. Cellier and Brunet, 1992) may not be valid, and are therefore not generally accepted, above forests. In forests, the eddy correlation method offers a more direct approach to flux measurements. In this case, a fast responding sonic anemometer is used to indicate the velocity and direction of the vertical air movement component (up or down eddies). A fast responding analyzer records the concentration of the trace gas of interest in conjunction with anemometer measurements. Once data are collected over an appropriate time interval (e.g., 30min), the concentration measurements can be separated to those related to eddies moving up from the canopy or down into the canopy. The net eddy flux is then calculated according to... 

Pulsed Eddy-Sonic Test Method (Shurtronic Harmonic Bond Tester)... 

Werle and Kormann (2001) report on a field campaign of CBU-emission measurements from rice paddy fields, simultaneously recording eddy correlation and closed-chamber data (the former by using a TDLAS system, the latter being based on the standard diffusion-chamber method). Simultaneously with the CEU-emission data, micrometeorological measurements were performed (e.g. recording wind direction and speed using a sonic anemometer). 

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