Investigation of ferrofluids nanostructure by the laser light scattering technique is presented. Experimental studies involved measurements of the intensity of the laser radiation scattered by ferrofluid particles in interaction with albumin and under the influence of magnetic field. The effects of the magnitude and duration of the applied magnetic field on the formation of aggregates of magnetic nanoparticles and also the influence of magnetic fluids of different concentrations on blood proteins are considered. The findings may be useful for medical applications.

In this work the way to increase the security of fingerprints recognition is considered. We suggested the polarimetric technique to be used in recognition systems. The technique was tested on real and model objects. It was demonstrated that the proposed technique allows us to provide effective protection of the system from breaking. Experimental results argue for effectivity of polarimetric techniques against fingerprint spoofing in biometric recognition systems. Based on the polarimetric technique we made a design of polarimetric fiber sensor, which can be used in mobile systems.

The concept of a combined measuring system for determination of the physical and dynamical parameters of a single micron and submicron particle is proposed in this paper. The results of an experimental testing and approbation of functional parts of the suggested system are presented.

The application of a dynamic pin-photodiode as a recording device of the fluorescence radiation is considered. An experimental setup for registration of luminescence signals from biomolecules excited by laser radiation was developed. Rhodamine 6G and chlorophyll were investigated.

This work is aimed at creating a modified invasive technique for assessing the liver’s functional reserves. A study of the degree of hepatodepression is carried out by measuring the plasma elimination of indocyanine green using the method of optical densitometry. This paper presents test results for an aqueous solution and an albumin solution, as well as the results of measurements of plasma elimination of indocyanine green for patients with liver disease. Perfecting the proposed method will make an important scientific contribution to modern diagnostic medicine. Diagnosing the stages in the progression of the disease and its developing complications can make it possible to rapidly correct the patient’s treatment algorithm, achieving positive outcomes in medical practice.

Currently, optical methods based on the registration of speckle dynamics are widely used in modern diagnostics of the microvasculature. The results of the development of a laboratory model of a small-sized non-contact speckle sensor of the microvasculature and the experimental procedure are presented. A speckle sensor model for determining the blood flow velocity in the microvasculature is given, on the basis of which a prototype sensor can be created. The results of preliminary experimental studies of the possibility of blood microcirculation monitoring in the microvasculature using speckle correlation analysis are presented. A group of conditionally healthy volunteers aged 18 to 24 years was analyzed during the experiments. The obtained results correlate with the results presented in the literature on the value of the determined blood flow velocity. Problems and prospects of speckle correlation monitoring of the microvasculature in laboratory and clinical conditions are discussed.