8A9 - A field-sensitive spectrometer for quasi-coherent scattering studies

Thermodynamic information of importance may be obtained from a study of temporal fluctuations such as occur in a dielectric fluid near its critical point. Starting from the original implementation by H. Z. Cummins et al., we have, in the course of such work, refined the instrument and its analysis. We describe our instrument together with analysis and measurements intended to illustrate its properties and suggest new applications.