A device and method for measuring the concentration of analytes in the blood
of
a portion of tissue. The device includes a sensor module, a monitor, and a processor
(separate from or integral with the sensor module). The sensor module includes
a radiation source for emitting radiation to the tissue; a collimator and narrow
band filter for processing the radiation after it has transmitted through or been
reflected by the tissue; and one or more sensors for sensing the transmitted or
reflected radiation. The one or more sensors send a signal to the processor which
algorithmically converts the radiation using linear regression or orthogonal functions
to determine the concentration of one or more blood analytes. The device self-calibrates
to eliminate error caused by variables such as skin character. The sensor module
is integrated to reduce size and weight such that it is inobtrusive, and the monitor
is compact for transport
