Measurement of complex refractive index of human blood by low-coherence interferometry

In this article, the usefulness of the optical technique for measurements of blood complex refractive index has been examined. Measurement of optical properties of human blood is difficult to perform because of its nonuniform nature. However, results of my investigation have shown the usefulness of low-coherence interferometry for measurement complex refractive index of human blood. Furthermore, mathematical analysis of spectrum of measured signal have made possible to determined relationship between complex refractive index and hematocrit level in human blood

Improved Methods of Signal Processing Used in Low-Coherent Systems

In this article the author presents improved techniques of signal processing used in low-coherent measurement systems. The author proposes to utilize the synthesized sources in the system with the temporal signal processing. It will be shown that the exploit of such a source can substantially reduce the signal-to-noise ratio required to identify the central fringe position. In case of using spectral signal processing, the author proposes to control the position of maximum in the spectral pattern which modifies the phase difference between interfering beams. The results of experimental works will show that described techniques can be an effective method for improving the signal processing in low-coherent measurement systems

Shaping coherence function of sources used in low-coherent measurement techniques

In low-coherent measurement techniques coherence function of the source affects metrological parameters of the designed system. Hence, in many applications, it is necessary to use some techniques to change the shape of coherence function of the source. It is possible to do so by the use of optic, mechanic and electronic methods. In this article, author analyses the possibilities of shaping the coherence function of the optic source by the use of optic methods. The result of theoretical investigation and simulations will show that the use of the source with shaped coherence function can improve the metrological parameters of the designed system

Optical Investigation of Hematocrit Level in Human Blood

In this paper use of selected optical methods of a hematocrit measurement has been presented. Elaborated methods have numerous advantages: relatively simple configurations, potentially low cost and high resolution. Investigation confirmed their ability to determine the hematocrit value with appropriate measurement accuracy. Furthermore, simultaneous use of complementary optical methods can substantially increase measurement reliability, because low-coherence interferometric measurement is based on physical (mainly optical) properties of the investigated object, while Raman spectroscopy is based on study of its molecular composition

Low-Coherence Fibre-Optic Interferometric Sensors

In this paper low-coherence fibre-optic sensors based on the Fabry-Perot and Michelson interferometer, which were designed and elaborated at our laboratory, are shown. We present results of investigation of the fibre-optic sensors working in both configurations. These results allowed us to compare properties of sensors working in both configurations. The theoretical analysis and experimental results made us possible to select best construction, which was implemented in low-coherence fibre-optic sensors of refractive index

Fiber-optic temperature sensor using low-coherence interferometry

Low-coherence interferometric sensors are an important group of optical fibre sensors. Combining high measurement resolution with broad measurement range, these sensors can measure accurately several physical quantities e.g. temperature. In this article we present the fiber-optic temperature sensor using low-coherent interferometry, which has been designed and elaborated