Abstract: A cardiovascular variability parameter can be detected independent of the relative absorption contribution of melanin in biological tissue. A light source and a polarization shaping device can illuminate a biological tissue with a polarized light having an inhomogeneous optical polarization wavefront. A polarization analyzer can receive the polarized light after it has interacted with the biological tissue and output a first and second polarization state. A detection device can have a light detector for detecting the first and second polarization state and at least a processor for detecting data related to the first and second polarization states, determining relative absorptions contributions of superficial and deep components of the biological tissue based on the first and second polarization states, and determining the cardiovascular variability parameter based on the relative absorption contributions of the superficial and deep components.

Abstract: A cardiovascular variability parameter can be detected independent of the relative absorption contribution of melanin in biological tissue. A light source and a polarization shaping device can illuminate a biological tissue with a polarized light having an inhomogeneous optical polarization wavefront. A polarization analyzer can receive the polarized light after it has interacted with the biological tissue and output a first and second polarization state. A detection device can have a light detector for detecting the first and second polarization state and at least a processor for detecting data related to the first and second polarization states, determining relative absorptions contributions of superficial and deep components of the biological tissue based on the first and second polarization states, and determining the cardiovascular variability parameter based on the relative absorption contributions of the superficial and deep components.

Abstract: A cardiovascular variability parameter can be detected independent of the relative absorption contribution of melanin in biological tissue. A light source and a polarization shaping device can illuminate a biological tissue with a polarized light having an inhomogeneous optical polarization wavefront. A polarization analyzer can receive the polarized light after it has interacted with the biological tissue and output a first and second polarization state. A detection device can have a light detector for detecting the first and second polarization state and at least a processor for detecting data related to the first and second polarization states, determining relative absorptions contributions of superficial and deep components of the biological tissue based on the first and second polarization states, and determining the cardiovascular variability parameter based on the relative absorption contributions of the superficial and deep components.