Opto-physiological sensor and method of assembly

An opto-physiological sensor comprising:

• a plurality of light sources;
• and
• at least one photodetector mounted to the sensor and configured to capture radiation originating from one or more of said light sources, after light from said light source has travelled through a body tissue type to be monitored,
• wherein the plurality of light sources are mounted to the sensor in fixed positions relative to the photodetector, the fixed positions being based on a model of the opto-physiological properties of the body tissue type to be monitored,
• wherein the separation of each light source from the photodetector is based on modelled optical path lengths for light travelling from each light source, through the body tissue type to be monitored, to the photodetector;
• and
• wherein a plurality of light sources of a first wavelength are positioned in a first array on the circumference of a first circle, the first circle being centered on the photodetector and having a radius based on the first wavelength,
• wherein a plurality of light sources of a second wavelength are positioned in a second array on the circumference of a second circle, the second circle being centered on the photodetector and having a radius based on the second wavelength,
• wherein each of the first and second arrays comprises at least four light sources.