Articles you may be interested inTemperature rise induced by a cw laser beam revisited J. Appl. Phys. 57, 5123 (1985); 10.1063/1.335245 Nonlinear calculation of a temperature profile produced in a twolayer structure by a scanning cw elliptical laser or electron beam J. Appl. Phys. 57, 965 (1985); 10.1063/1.334698 Erratum: Temperature profiles induced by a scanning cw laser beam [J. Appl. Phys. 5 3, 4364 (1982)] J.Temperature evolutions in silicon induced by a scanned cw laser, pulsed laser, or an electron beam Temperature distributions produced in semiconductors by a scanning elliptical or circular cw laser beam We present calculations of the temperature profiles induced by a moving cw elliptical laser beam with a Gaussian intensity distribution in a semi-infinite material. Temperature-dependent thermal diffusivity, conductivity, and surface reflectivity are incorporated in our model, and some aspects of melting are discussed. As an example, we apply the calculations to silicon. For a comparison of stationary elliptical spots of varying eccentricities, we present materialindependent normalized linear temperature profiles. We find that highly elliptical beams can be used to rapidly scan and anneal large areas.
Continuous noninvasive measurement of vital bio-signs, such as cardiovascular parameters, is an important tool in evaluation of the patient’s physiological condition and health monitoring. Based on new enabling technologies, continuous monitoring of heart and respiration rate, pulse wave velocity and blood pressure have been investigated, advanced and reflected in numerous papers published in recent years. In this paper, we introduce a new technique for noninvasive sensing of vital bio-signs based on a multimode optical fiber sensor that can be integrated into a fabric. The sensor consists of a laser, optical fiber, video camera and computer. Its operation is based on tracking of point-wise intensity variations on speckle patterns caused by interference of the light modes within the fiber subjected to deformation. The paper contains theoretical analysis and experimental validation of the proposed scheme. The main goal is to advance a simple low-cost sensor embedded in a cloth fabric to track changes in the cardiovascular condition of the wearer.
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