Hand held glucose colorimeter device

摘要

A method and apparatus for increasing the sensitivity and accuracy of apparatus used in chemical analysis utilizing the colorimeter method. The method employs two or more light emitting diodes which emit light at different wavelengths. The emission wavelength of the L.E.D. is automatically switched to an L.E.D. which most closely matches any desired absorption band in the solution being analyzed so that more or less absorption will occur in each range. A logic circuit which utilizes the initial optical density to choose the proper L.E.D. for the particular range of concentration of chromophore. Thus, a green emitting diode may be used to register an initial color change and automatically switched to a red L.E.D. at any chosen concentration.