Patent ID: 6036922
Filing Date: 2000-03-14
Classification: G01N,Y10T

Abstract:
An apparatus for measuring a concentration of a specific constituent comprising:a sample cell to hold a liquid sample containing protein;a heater for heating said liquid sample in said sample cell;a temperature measurement unit for measuring the temperature of said liquid sample;a light source for projecting substantially parallel monochromatic light rays on said liquid sample;a photosensor for detecting the light component transmitted through said liquid sample out of the projected light rays and outputting a signal corresponding to the intensity of the detected light rays;a magnetic field application unit for applying a magnetic field on said liquid sample;a magnetic field sweep unit for sweeping said magnetic field;a magnetic field modulation unit for vibration-modulation of said magnetic field;a polarizer, mounted between said light source and said sample cell, for transmitting a specific polarized light component only out of the light rays projected from said light source;an analyzer, provided before said photosensor, for transmitting a specific polarized light component only out of the light rays passed through said sample cell;a lock-in amplifier for the phase-sensitive defection of the output signal from said photosensor referring to the modulated signal of said magnetic field modulation unit; anda calculator for calculating an angle of rotation of said liquid sample and intensity of transmitted light rays according to the output signal from said lock-in amplifier.