Photo-acoustic emission measurements in liquid-based food and aqueous products
نویسنده
چکیده
Pulsed laser light when of low to moderate intensity impinged into an aqueous media generates stress waves by thermoelastic mechanism. Referred to as photo-acoustic emission (PAE) these arise from sources during rapid laser liquid interaction that contains valuable information on the state of the composition and concentration of the liquid. Optical energy from a Q-switched Nd-YAG laser light source (wavelength of 1.064 μm, 50mJ maximum power) is lead into a Perspex cell (100 millilitres capacity) containing sample liquid-based food products and picked up using a piezoelectric (1MHz bandwidth) transducer 30mm distant from and in-line with the optical fibre. Spectral measurements of PAE generated in water, milk and other diverse liquidbased food and aqueous products provide distinguishable classes of power spectral density and frequency ranges. Grin rod lens fixed to the PAE cell improved the PAE signal-to-noise ratio by two orders of magnitude. Variation of milk concentration in water and influence of iron filings in oil are discussed.
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