Diffusing Wave Spectroscopy (ULUND)

Light Scattering

Description

The instrument is used for characterization of extremely turbid samples and is equipped with diode-pumped solid-state laser (wavelength of 660 nm) with a maximum power of 70 mW. The apparatus is implemented with a “Two-Cell Echo Technique” which allows reducing measurement times down to only a few minutes even for slowly relaxing and solid-like materials. The sample is filled into squared glass cells of 1 – 10 mm and placed in a temperature controlled sample environment (15-70ºC). The scattered light is detected with two efficient Avalanche Photo Diodes in transmission and processed by a multi-tau/linear correlator using pseudo-crosscorrelation as well as echo measurements. Also possible are experiments using backscattering geometry as well as CCD camera-based multispeckle measurements. The equipment runs with a powerful software solution (LS-Instruments, Fribourg, Switzerland) for data acquisition and analysis (combined correlation-echo measurements, single-, multi-speckle analysis, user defined multi-run scripts, online microrheology analysis and full data access). 

The instrument is typically used for: 

 

Possible instrument configuration 

The instrument is implemented with the Two Cell and Two Cell Echo Technique, which allows for measurements of nonergodic samples and reduces measurement times to only a few minutes even for slowly relaxing and solid-like materials. 

 

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