Patent ID: 7729734

Claim:
A glucose detection method comprising the steps of: a) providing first and second sources of radiation, said first and second sources generating first and second beams, respectively, wherein said first source of radiation has a wavelength approximately equal to a peak wavelength of a glucose absorption band, and wherein said second source of radiation has a wavelength off of said peak wavelength of said glucose absorption band; b) producing a first modulated beam and a second modulated beam by modulating an intensity of said first beam and an intensity of said second beam, respectively; wherein said first and second modulated beams are modulated at a substantially equal frequency, and wherein a phase of said first modulated beam differs from a phase of said second modulated beam by approximately 180 degrees; c) substantially equalizing an intensity of said first modulated beam and an intensity of said second modulated beam; d) directing said first and second modulated beams to co-linearly irradiate a tissue, e) obtaining a signal by detecting blackbody radiation emission radiated by said tissue with a phase-sensitive detection system comprising a thermal detector, wherein a reference signal for said phase-sensitive detection is provided at said frequency; and f) correlating said signal with a concentration of glucose in said tissue.