SU697810A1 - Standard for reproducing measured value - Google Patents

Description

I

The invention relates to the field of measurement and control technology, in particular, to optical means of measuring angles, and can be used both for calibration of measuring devices intended for measuring angles and for measuring right angles of machine parts.

Measures are known for reproducing the measured value using optically measuring means, such as angle, made in the form of MHOiorpaHHbix reference measuring prisms 1. These measures are very difficult to manufacture because of the combination of high accuracy requirements for manufacturing angles with the requirements for stability of prisms. . These prisms must be certified after release. Manufacturing technicians and certifications determine the corresponding measurement errors, which limits the accuracy of the measurement as a whole.

The closest technical solution to the invention is a measure for reproducing the measured value with the aid of optical measuring means, made in the form of an optically transparent cell filled with TWO components with

density, one of which is an optically transparent liquid, the other is a polymeric material in the form of a tensioned thread 2. Due to the fact that the density of the material of the thread and the density of its environment are equal, the buoyant force and the threads will be mutually balanced, the thread will be the action of only internal forces will take a linear form — along the horizontal surface of the liquid. Such a liquid measure does not require certification, since it uses as a standard the physical properties of the liquid, which allows ovysit measurement accuracy. However, this measure does not allow to measure the right angle - a widespread quantity in engineering

measurements and, moreover, serving as a base for reading angles of 180 °, 360 °.

The aim of the invention is to expand the scope.

The goal is achieved by the fact that

Claims (2)

The second component also selected an optically transparent liquid that is not mixed with the first one and has a different reflection coefficient, and in the cuvette both liquids are placed so that they are separated by a vertical surface. The drawing shows a schematic diagram of a measure for reproducing a measured value using optical measuring means, for example, using an autocollimator. The measure contains a transparent cuvette 1, filled with two components with equal densities, which are immiscible liquids 2 and 3, which are separated by a vertical flat surface 4. Reproduction of the measured value (right angle) using the described measure and optical measuring means - autocollimator 5 produced as follows. Under the action of hydrostatic forces and molecular interaction forces, the geometric shape of surface 4 is almost identical to the horizontal surface 6 of liquids 2 and 3. Under the action of gravitational and hydrostatic forces, surface 4 is located strictly at an angle of 90 ° to horizontal surface 6 (from the minimum energy of the free surface ). The position of the surface 4 of the diffusion of liquids does not affect, since the diffusion is uniform and does not exceed the thickness of the molecular layer of the liquid. The autocollimator 5 is installed perpendicular to the horizontal reflecting surface 6, (position 1) with the highest achievable accuracy and sensitivity. The autocollimator is then rotated on a special device (not shown in the drawing) and set in a horizontal position And zero (or the same division of the autocollimator as in the vertical position I) —with reflection from vertical surface 4. The angle of rotation of the autocollimator from position 1 in Position II, when installed in an identical position along the slit of the autocollimator 5, in both positions along the reflection from surfaces 6 and 4, makes it possible to reproduce an angle of 90 ° formed by said surfaces of liquids 2 and 3. When measuring an angle of 90 °, and reflective surfaces of the cuvette is removed and mounted on a place item, then set to zero on one face autocollimator checks emogo 90 ° angle and is measured by the autocollimator position of the second edge. Comparison (calculation) of the corresponding values by the autocollimator makes it possible to estimate the measured angle of the object. In order to eliminate the influence of the cuvette wall on the measurement accuracy, the refractive index of the PTs of the material of the cuvette 1 is selected as close as possible to the refractive index n ((liquids 2 and 3: n ,, - n- 0.0001 Invention Measure to reproduce the measured value using optical means, made in the form of an optically transparent cuvette filled with two components with equal densities, one of which is an optically transparent liquid, characterized in that, in order to expand the field of application. The second component also selected an optically transparent liquid that is not displaced from the first and has a different reflection coefficient, and both liquids are placed in a cuvette so that they are separated by a vertical surface. Sources of information taken into account during the examination 1.G. et al., Reproduction and Transmission of Angle Values with Reference Measurements, Journal of Measuring Equipment, 1960, No. 10, pp. 13-15. 2. USSR author's certificate number 336496, cl. G 01 B 5/28, 1970 (prototype). V ////////// X /////////