Elastic light-scattering detection methods

In addition to acoustical methods, which take advantage of the fact that gas nuclei (i.e., stable microbubbles) are elastic bodies and thus absorb sound energy (ref. 4,5,9,25,26,31,32,50), another class of methods for detecting these gas microbubbles that has been employed repeatedly is based on their optical behavior. Specifically, most of these optical methods involve detection of these long-lived microbubbles in water from the light scattered by them (ref. 5,26,59,60,127). 

The most recent measurements of this kind are those of Walt and Beyster. These authors used a collimated beam of 4.1 Mev neutrons produced in the H (i, n) He reaction and measured the elastic scattering of the neutrons produced from targets placed in the neutron beam. Their detector consisted of a number of spherical plastic scintillators separated from each other by quartz plates and placed at the end of a light guide. This method of detection, first described by McCrary, Taylor, and Bonner, by limiting the size of each detecting unit,... 

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