SU868493A1

SU868493A1 - Optic activity measuring method

Info

Publication number: SU868493A1
Application number: SU782645607A
Authority: SU
Inventors: Такир Хасанов; Константин Константинович Свиташев
Original assignee: Институт Физики Полупроводников Со Ан Ссср
Priority date: 1978-07-13
Filing date: 1978-07-13
Publication date: 1981-09-30

Description

(54) СПОСОБ ИЗМЕРЕНИЯ ОПТИЧЕСКОЙ АКТИВНОСТИ(54) METHOD OF MEASURING OPTICAL ACTIVITY

1one

Изобретение относитс к измерении оптической активности веществ.This invention relates to the measurement of the optical activity of substances.

Известны способы измерени вращени плоскости пол ризации оптически активным веществом, основанные на пропускании света через полиризатор , исследуемое оптически активное вещество и анализатор l 1.Methods are known for measuring the rotation of the polarization plane by an optically active substance, based on the transmission of light through a polyrizer, the optically active substance under investigation, and the analyzer l 1.

Недостатком указанных способов ёл етс недостаточно высока чувствительность измерений.The disadvantage of these methods is that the sensitivity of measurements is not high enough.

Наиболее близким к предлагаемому вл етс способ измерени оптической активности, заключающийс в пропускании линейно-пол ризованного света через образец и измерении угла поворота плоскости пол ризации 21.Closest to the present invention is a method for measuring optical activity, which involves passing linearly polarized light through a sample and measuring the angle of rotation of the polarization plane 21.

Однако этот способ не позвол ет измер ть углы вращени плоскости пол ризации пор дка угловой секунды.However, this method does not allow measuring the angles of rotation of the plane of polarization for an angular second.

Цель изобретени - измерение углов вращени плоскости пол ризации пор дка угловой секунды.The purpose of the invention is to measure the angles of rotation of the polarization plane of the order of angular second.

Поставленна цель достигаетс тем, что луч, прошедший через образец направл ют на отражающую плоскопараллельную пластину под углом, равным углу Брюстера ±0,5-3°.This goal is achieved by directing the beam that passes through the sample onto the reflecting plane-parallel plate at an angle equal to the Brewster angle of ± 0.5-3 °.

Предлагаемый способ основан на законах отражени плоско-пол ризованного света от границы раздела двух прозрачных изотропных сред.The proposed method is based on the laws of reflection of plane-polarized light from the interface between two transparent isotropic media.

При измерени х угла вращени плоскости пол ризации света посредством поворота анализатора до положени полного гашени , способ позвол ет использовать анализатор с лимбом, снабженным минутной шкалой. В этом случае угол поворота плоскости пол ризации cL, обусловленный оптически активным веществом, определнетс по формуле . у.When measuring the angle of rotation of the plane of polarization of light by rotating the analyzer to the full quenching position, the method allows the use of an analyzer with a limb equipped with a minute scale. In this case, the angle of rotation of the polarization plane cL, due to the optically active substance, is determined by the formula. y

tgoC -Fq- tg (A-AQ),tgoC -Fq- tg (A-AQ),

Claims

where A-Ajj is the angle reading on the analyzer's limb in minutes (or a fraction of a minute); 3 Gy, the Fresnel coefficients of the S component of the electric vector of the light wave for a specific angle of incidence of light on the reflecting plate. An example. The optical activity of a 0.1% freshly prepared dietary sugar solution is determined. The LEF-2 ellipsometer is used. A linearly polarized light beam is directed onto the solution, after passing through which it is directed onto a plane-parallel plate of fused silica on I near the Brewster angle. For the specified angle of incidence, it is established that 24. After that, the ratio of the signal hysteresis determines the true polarization angle e6 1.358 using the formula. When using the proposed method, the limbs are transferred from larger scales to smaller ones, which ensures the use of 3, for example, minute limbs as 5 second. Claims The method of measuring optical activity is to transmit linearly polarized light through a sample and measure the angle of rotation of the polarization plane, characterized in that, in order to measure the angles of rotation of the polarization plane for about an angular second, the beam passing through the sample is directed on a reflecting plane-parallel plate at an angle equal to the Brewster angle ± 0.5-3 °. Sources of information taken into account in the examination 1. Volkova EA Polarization measurements. M., Standards Publishing House, 1974, p. 77-82, 90-108.

2. The author's testimony of the USSR No. 553869, cl. G 01 N 21/40, 1975.