SU1670394A1 - Reflectometer for measuring polarization parameters of liquid surfaces - Google Patents

Abstract

The invention relates to a measurement technique and can be used, in particular, to measure the combined polarization parameters of the surface of liquid objects. The purpose of the invention is to make it possible to measure the combined polarization parameters of the surface of liquid objects. The reflectometer contains a radiation source installed along the radiation goniometer with two tables 1 and 2 with the possibility of placing reference and controlled objects on them, a modulator, a photodetector, two polarizers 6 and 7 with mutually perpendicular polarization planes. At the same time, the planes are installed in the plane of the horizontal table 1, and the other in the plane perpendicular to the plane of the table 2. The reflectometer also contains four flat mirrors 8, 9, 10 and 11, installed in pairs on both sides of each of the tables 1 and 2 The modulator is made in the form of two mirrors 3 and 4, mounted midway between each of the two pairs of flat mirrors 8, 9 and 10, 11, and kinematically interconnected. 2 Il.

Description

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The invention relates to a measurement technique and can be used, in particular, to measure the combined polarization parameters of the surface of liquid objects.

The purpose of the invention is to make it possible to measure the combined polarization parameters of the surface of liquid objects.

FIG. 1 is a schematic diagram of the reflectometer, front view; in fig. 2 - the same, top view.

The device contains a radiation source (not shown), table 1 for placing a reference object on it (not shown), table 2 for placing a controlled object on it (not shown), mirrors 3 and 4, photodetector 5, polarizers 6 and 7, mirrors 8-11. The goniometer includes tables 1 and 2, 00 — the axis of rotation of the goniometer. The modulator includes mirrors 3 and 4, which are kinematically connected to each other. The polarization planes of polarizers b and 7 are mutually perpendicular and set so that one of them is placed in a plane perpendicular to the plane of table 1. and the other is in the plane of horizontal table 2.

The reflectometer works as follows.

Radiation directed along axis 00 hits mirror 3, when rotating around the axis perpendicular to axis 00, radiation is alternately directed either onto table 1 or table 2, and then, after reflection from the reference and controlled objects and respectively mirrors 10 and 11, is directed to the mirror 4, which alternately (due to kinematic connection with the mirror 3) directs radiation either from the reference object or from the object being monitored to the photodetector 5, where the recorded AC signal (voltage) is directly proportional to the level These are the differences in reflection coefficients in p-polarization for the object under control and s-polarization for the reference object. Since the polarization planes of polarizers b and 7

mutually orthogonal, when rotated by 90 ° around the axis of the radiation beam, the directions of the polarization planes reflected from the reference and controlled objects

The radiation is reversed and the alternating current (voltage) signal detected at the photodetector 5 corresponds to the level of difference in reflection coefficients in the p-polarization for the reference object and s-polarization for the object being monitored. By the difference in the magnitudes of the alternating current signals obtained by placing the polarizers 6 and 7 different by 90 ° in these two azimuthal positions,

determine the magnitude of the discrepancy between the parameters of the surface of the test object with respect to the reference one.

Using a reflectometer, you can measure combined polarization

surface parameters of both liquid and solid flat shaped objects.

Claims (1)

The Reflectometer for measuring the polarization parameters of an object's surface, comprising a radiation source, a goniometer installed along the radiation path, including tables for placing reference and controlled objects on them, respectively, a modulator and a photodetector, characterized in that combined polarization parameters of the surface of liquid objects, it is equipped with two polarizers with mutually perpendicular polarization directions ii, one of which is parallel to the table plane, intended for receiving thereon the reference object, and another - parallel to the plane perpendicular to the table plane, intended for receiving thereon the controlled object, and four flat mirrors mounted pairwise on each side of each table, and the modulator is made in the form of two pairs of flat mirrors installed midway between each of the two pairs of flat mirrors and kinematically connected to each other. F figure 1