SU659901A1 - Inclination angle measuring device - Google Patents

Description

changes in supply voltage and luminous flux, as well as low sensitivity, due to the presence of "background illumination of light receivers, which is caused by repeated reflection of light rays from the vessel walls, prism and mirror. In addition, the known device is sensitive to accelerations and vibrations, which significantly limits its use.

The aim of the invention is to increase the sensitivity and accuracy of measurements.

For this, in a device for measuring tilt angles, containing a sensing element mounted in a sealed chamber filled with optically transparent damping fluid and attached through a torsion to the bottom of the chamber, a light source and a computing device, the optical system is made up of a set of lenses that form three flat fan-shaped light. beam diverging at given angles, and the sensing element is made in the form of two scanstors, mounted parallel to each other and symmetrically with respect to The torsion mount on a common basis, fiber-optic faceplates are installed on the entrance pupils of the scanstors, and the outputs of the scanstors are connected through parallel-connected blocks for signal extraction and a serially connected block to them for measuring time intervals and an encoder are connected to a computer.

FIG. 1 shows a circuit diagram of the device; in fig. 2 and 3 - diagrams of light fluxes; in fig. 4 - diagrams of electrical signals.

The tilt angle measuring device comprises a sealed, light-tight chamber 1, which is filled with a light-absorbing damping liquid 2, a sensing element 3 movably connected to the bottom of the camera 1 by means of a torsion 4, a light source 5 and an optical system 6, which forms three flat fan-shaped light beams 7 forming the known angles a between themselves, as well as the blocks 8 and 9 for selecting the signals, the block 10 for measuring the time intervals, the encoder 11 and you the numeral machine 12. The sensing element 3 is formed by two position-sensitive photographic devices (scanstors) 13 and 14, which are placed on a common base 15, having a ring balance 16 and a float 17. The ring balance 16 is connected to the float 17 movably (for example by means of a thread) and is designed to regulate period of natural oscillations of the sensing element 3 and reducing the sensitivity of the device to linear accelerations. Scanners 13 and 14 through blocks 8 and 9 are connected to

consecutively connected by the block 10, the encoder And and the computing machine 12. Above the scanners 13 and 14 are installed optical fiber faceplates 18 and 19, designed to eliminate the parasitic background illumination of the scanstors and increase the resolution of the device.

A device for determining the angles of inclination of an object works as follows. Light rays 7 fall on the surface of the sensing element 3, forming three narrow light strips - traces 20 (see Fig. 2). At object tilt angles of zero, the light trails 20 are equally spaced straight lines lying in the xyz planes and parallel to axis 02 (see Fig. 2). In the presence of the angles of inclination of the object about the axes oo and 02, the parallelism of the traces of 20 light rays is broken, and the distances 1x1 and 1x2 between them change (see, for example, Fig. 3).

Under the action of light on scanstors 13 and 14, a pattern of light-excited and separated p + l transitions of minority carriers is created. When scanning, which occurs by changing the sawtooth voltage applied to the scanner, the scanning edge has an H-aperture due to the nonlinear properties of the transitions. The video signal reflecting the luminance distribution on the scanors 13 and 14 is taken from the corresponding blocks 8 and 9 and fed to the block 10.

FIG. 4a and b show oscillograms of signals from scanstors 13 and 14 in the absence of the object tilt angles; in fig. 48 and d - at the occurrence of tilt angles.

As can be seen from FIG. 4, information on the measured angles V and Y contain time intervals t between video pulses. The rotation of the sensing element 3 around the axis 02 leads to a change in the ratio of the time intervals ti, T2l, and tsh. T2p between the video pulses from each of the scanstors 13 and 14, respectively, and the rotation around the axis oh leads to the inequality of the corresponding time intervals between the video pulses from the scanstors 13 and 14, i.e.

 and a 2n ms signal from block 10 enters the encoder 11, and the resulting encoded signal goes to the computer 12, where the measured angles V and Y are determined by the formulas.

I -1 / I g V

 ± y –t + k (TJ

tg

Cosf

tga tgv

Where

With “(1-L).

.

g,

  In 2P1l 2.1

- -;

PE + + T2L

C 1.1 (., + T ,,,) - К „+ t,„),

where VL is the scanning speed; moreover, the angle V has the same sign as the value A, and the angle 7 has the same sign as the value C.

The device allows to measure the angular position of the object with high accuracy in a large dynamic range, not sensitive to the action of linear accelerations leading to parallel movement of the sensing element 3 along the axes of axes, oz, oy; The measurement information is obtained in the form of time intervals between video pulses, which are easily converted into a digital code for input into a computer.

In addition, the time intervals between pulses depend little on the parameters of the pulses themselves (amplitude, duration and steepness of the fronts), which ensures high accuracy of measurements.

Claims (3)

1. USSR author's certificate number 194335, cl. G 01 C, 9/06, 1967. 2. USSR author's certificate number 154030, cl. G OIC, 9/32, 1963. 3. USSR author's certificate No. 450079, cl. G 01 C, 9/36, 1975. Figg l / | BUT; B l  Шtfff Oq A ai I fCT Up Mr. W g /  yp . Г ;; I {