Optical rotation measuring device and optical rotation measuring method

Abstract

A small-size optical rotation measuring device for detecting an organism, a tissue, blood, or molecules having rotatory power and determining the content thereof with high accuracy and an optical rotation measuring method for detecting an organism, a tissue, blood, or molecules having rotatory power and determining the content thereof with high accuracy. A nonreciprocal optical system is disposed in a loop optical path of a ring optical interferometer, and thereby light beams of circularly polarized modes orthogonal to each other are propagated in opposite directions through a sample to be measured. The wavelength of the light beams from a light source is in a wavelength region where the loss by the nonreciprocal optical element is low. A signal processing technique for phase-modulation optical fiber gyro having the highest resolution among ring interferometers is applied.

Description

technical field [0001] The present invention relates to an optical rotation measurement device and an optical rotation measurement method capable of accurately detecting the presence and content of optically active organisms, tissues, blood, molecules, etc., by analyzing the optical rotation characteristics of a subject. More specifically, The present invention relates to a polarimetry method and a polarimeter capable of measuring the optical rotation of optically active substances contained in human blood, saliva, hair, and specific human tissues with high precision. Background technique [0002] Conventional optical blood glucose level measuring methods are roughly classified into three types. The first method is, as described in Patent Document 1, to irradiate a part of a living body such as a finger with infrared laser light, and to measure glucose contained in blood by spectroscopically scattering light from blood vessels. This takes advantage of the fact that scattere...

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Problems solved by technology

In this method, although the blood sugar level of a healthy person, 0.1 g / dL, can be measured with sufficiently high accuracy on a sample with a thickness of about 10 mm, it is 0.1 g / dL for a trace amount of blood with a thickness of 1 mm or less in the sample. Sufficient measurement accuracy cannot be obtained for non-invasive measurement of living organisms such as blood vessels in mm

In addition, since 6dB insertion loss occurs in the optical directional coupler that separates and combines the light source and the light receiver, there is a problem that the light output level of the interferometer is low

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