Device for real-time monitoring of oil-in-water and suspended solids based on thermal lens spectrometry and light scattering

Abstract

A novel system suitable for simultaneous monitoring of both oil-in-water and suspended solids based on thermal lens spectroscopy and forward light scattering is presented. The technique measures the concentration of dissolved hydrocarbons and simultaneously detects single oil droplets and suspended particles separately. The device was tested with injection water samples from an on-field water treatment plant, and hydrocarbon concentrations were measured with a precision better than 5% in the range of up to 100 ppm, reaching resolutions as low as 0.03 ppm. Particle detection was tested with model samples of dyed and undyed polystyrene spheres acting as absorption and scattering centers, which simulated oil droplets and suspended solids, respectively. We show that particles of different sizes are distinguished by the magnitude of the perturbations introduced in the signals, and their concentrations can be measured independently of dissolved components.

Recent Advances in Spatial Self‐Phase Modulation with 2D Materials and its Applications

“…[224,[235][236][237] The thermal diffusion time t c and thermal diffusivity D are easily determined by the following equation to obtain the phase shift. [238][239][240]…”

“…[ 224,235–237 ] The thermal diffusion time and thermal diffusivity D are easily determined by the following equation to obtain the phase shift. [ 238–240 ] Certain studies claim that SSPM is caused by thermal lensing and call it thermal blooming. [ 241–244 ] Further, TLS technology was also used to measure thermo‐optic properties.…”