(2019) Tiago, Marcelo Moreira; Higuti, Ricardo Tokio; Oliveira, Samuel L.; Assunção, Edvaldo; Kitano, Claudio; Elvira, Luis
This work describes the development and tests of
a new ultrasonic spectrometer for liquids based on the use
of commercial cuvettes for sample handling. The spectrometer
operates in the frequency range from 20 to 80 MHz and gathers
some important characteristics, which are its high thermal
stability (better than 0.01oC), by the use of Peltier cells, and
practical sample handling with small volume ( 3 ml) samples
placed inside cuvettes which can be easily removed from the
spectrometer, cleaned/sterilized or simply discarded. Throughtransmission
operation is used to measure propagation velocity
and attenuation coefficient, and the spectrometer was tested with
mixtures of water and NaCl, which have attenuations smaller
than that of distilled water, and higher attenuation samples of
silicone and castor oil. Backscattering studies of polystyrene
particles of 10 and 15 μm-diameters were also conducted,
showing the versatility of the instrument.
