SU531069A1 - Co-incident Refractometer - Google Patents

Description

one

The invention relates to optomechanical instruments and is intended to measure the difference between the parameters of gfelompore and the dispersion of samples.

Known refractometer containing

a light source, a condenser, an entrance slit, a lens, an exemplary and studied prism measuring system and a photodetector. A polarizer and a modulator are installed in the known refractometer after the entrance slit to create circularly polarized light with a periodic change in the direction of circulation, and an analyzer mounted in the form of two polarization plates with different directions of polarization planes, for example, mutually orthogonal, is installed in front of the photoreceiver. one}.

A disadvantage of the known refractometer is that light beams with different directions of circulars pass through the same optical path, which makes it impossible to measure using the two light beams with different directions of circulation at the same time.

The closest technical solution to the proposed one is a refractometer containing a light source, a condenser, an input slider, a collimation lens, an exemplary and test prism, a telescope tube, a measuring system, such as an optical micrometer and an ocular.

In this refractometer for co-incident measurements, two obturators are installed in front of the entrance slits and in front of the model and test prisms, one of which alternately overlaps the top and bottom halves of the slit, and the other alternately overlaps the sample and test prisms 2.

The disadvantage of the refractometer is the presence of rotating shutters, which complicates the design of the instrument and reduces the accuracy due to vibrations.

The aim of the invention is to simplify the design and enhancement; measurement accuracy.

The goal is achieved by the fact that in a co-incident refractometer a first pair is installed in front of the entrance slit

polarizers, which intersects the upper and lower halves of the entrance slit, and in front of the model and test prisms, a second pair of polarizers is installed, which overlaps respectively the model and test prisms, and the polarizers included in each pair have mutually orthogonal directions of the polarization planes.

FIG. Figure 1 shows the optical scheme of a co-incident refractometer; in fig. 2 - the relative position of the first pair of polarizers and the entrance slit, as well as the second pair of polarizers and prisms, exemplary and studied; in fig. 3 - field of view of a co-incident refractometer. A co-incident refractometer contains light source 1, condenser 2, the first pair of polarizers 3,4, entrance slit 5, mirror 6, collimation lens 7,

the second pair of polarizers 8, 9, the model and test prisms Yu, 11, the lens of the telescopic tube 12, the optical micrometer 13 and the ocular p 14.

The light source 1 by means of a condenser 2 illuminates the entrance slit 5, in front of which there is a first pair of polarizers 3, 4 with mutually orthogonal directions of the polarization planes that intersect the upper and lower halves of the entrance slit 5. Light beams that pass through the upper and lower halves the entrance slit 5 becomes half-segmented in mutually phthogonal planes. Further, the light beams are reflected from the mirror 6, passing through the collimation lens 7 a second pair of polarizers 8 and 9, installed in front of the model and examined prisms 10, 11, respectively.

The arrangement of polarizers with mutually orthogonal directions of the polarization planes in front of the entrance slit 5 and the exemplary and studied prisms 10, 11 gives the following effect: polarized radiation passing through one of the halves of the entrance slit 5 will pass only through the prism in front of which the polarizer is installed having a parallel direction

the polarization plane, which allows the field of vision to be separated for co-incident measurements.

Passing through the prisms 1O and 11, the light rays enter the lens of the telescopic tube 12, giving in their focal plane images of the spectra of prisms 10 and 11, which are considered in the eye 14. The measurement of the difference in indicators of the prism materials 10 and 11 is measured using an optical mirror micrometer 13, which allows the spectra to be shifted relative to each other.

The readings on the scale are taken at the time of the nonial alignment of lines in the spectra of prisms 10 and 11, corresponding to the same wavelength of light.

Claims (2)

1. USSR Author's Certificate No. 335585, class C, 0i p 21/46, 1970. 2. USSR Author's Certificate No. 232104 Cl. G01 p 21/46, 1969, (prototype). L Fsh one eleven 2