SU1203356A1 - Light-projection range finder - Google Patents

Description

The invention relates to a measuring and measuring technique for measuring the distances, sizes and shapes of large-sized products in heavy, atomic and power engineering.

The purpose of the invention is to expand the range by making it possible to measure distances to products of various surface shapes.

FIG. 1 shows the scheme of the range finder of the projection receiving gallery; in fig. 2 is a scheme for measuring the distance to an object whose plane is not perpendicular to the axis of symmetry of the device; in fig. 3 - the image of the bar mark 1 relative to the axis of the receiving aperture at different positions of the object plane.

The range finder (Fig. 1) contains symmetric projection and receiving branches. A projection branch consists of an accumulation lamp 1 with a straight angle filament, an optical converter in the form of a system of three flat mirrors 2 - 4 and a lens 5. The receiving branch contains a lens 6, an optical converter of three mirrors 7 -. 9, the receiving diaphragm 10 and the pointing device 11. Mirrors

ten

It is located on the surface of the object, the distance to which is measured. Reflected from the surface, the light flux through the lens 6 and the system of mirrors 7-9 creates in the plane of the receiving diaphragm 10 an image of the bar mark 1. Suppose that the object is the plane P defined by the position of the point M (D, 0,0) on the axis of symmetry of the range finder and the orbit of the normal GGy constituting the angles (X,, ft, with the axes of the coordinate system S (xoyZ), with the axis QX aligned with the instrument's base, and axis 0 directed along the length of

15 lines of distance (. Axis of symmetry

device) (Fig. 2). At the same time, the image of the bar mark 1 makes the angle Cf with the axis of the diaphragm 10.

Consider the three positions of the object.

20 measurements.

If the object's plane is perpendicular to the plane of the measuring triangle (90 °), then the angle cf is equal to zero and the image of the bar mark coincides with the axis of the receiving aperture (Fig. 3a). If the ort is the normal of the object's plane, the axes of the xoy Z axis are 60-120 ° and f 60-120 with the axes, then the image

The 30 bar mark is rotated by 3 and 8 secured to the carriage 12, the over angle cf 10-15 relative to the axis is biased along precise guides under the action of the cam .13 and the springs 14 parallel to the optical axis of the lenses, i.e. parallel to the axis of symmetry of the rangefinder. The constant parameters of the optical rangefinder scheme are the focal lengths of the lenses and the baseline distance B. The receiving diaphragm window 10 is made in the form of two identical equiaxial trapezoids with aligned small bases equal to the width of the image of the bar mark and located in the plane of measurement

receiving diaphragm (fig. 3b, c).

In this case, the borders of the bar image are aligned with the sides of the upper and lower trapezium of the receiving diaphragm 10 side parallel to 2J. Regardless of the guidance method (visual or photoelectric), the bar image with the selected shape of the receiving diaphragm at any J / fits into its window such that the sum of the areas of the unlit areas of the diaphragm (the sections are shaded) does not change,

40

tel triangle, and the angle when ver-45 provides a constant level of noise.

the trapezoid busbar is assumed to be (90-) 75-80; under actual measurement conditions, the bar mark can be rotated by the angle tf - d: (10-15).

The operation of the circuit is as follows.

Light bar (filament lamp filament) through a system of mirrors 2-4 and a projection lens 5

and consequently, the constant sensitivity of the photoelectric guidance system, which determines the measurement accuracy, which makes it possible to expand the range of application of the rangefinder, i.e. measure the distance to the object of a complex configuration, the measurement planes of which are not perpendicular to the axis of symmetry of the instrument.

It is located on the surface of the object, the distance to which is measured. Reflected from the surface, the light flux through the lens 6 and the system of mirrors 7-9 creates in the plane of the receiving diaphragm 10 an image of the bar mark 1. Suppose that the object is the plane P defined by the position of the point M (D, 0,0) on the axis of symmetry of the range finder and the orbit of the normal GGy constituting the angles (X,, ft, with the axes of the coordinate system S (xoyZ), with the axis QX aligned with the instrument's base, and axis 0 directed along the length of

5 lines of distance (. Axis of symmetry

device) (Fig. 2). At the same time, the image of the bar mark 1 makes the angle Cf with the axis of the diaphragm 10.

Consider the three positions of the object.

0 measurements.

If the object's plane is perpendicular to the plane of the measuring triangle (90 °), then the angle cf is equal to zero and the image of the bar mark coincides with the axis of the receiving aperture (Fig. 3a). If the ort is the normal of the object's plane, the axes of the xoy Z axis are 60-120 ° and f 60-120 with the axes, then the image

The 30 bar mark turns by an angle of cf 10-15 relative to the axis

receiving diaphragm (fig. 3b, c).

In this case, the borders of the bar image are aligned with the sides of the upper and lower trapezium of the receiving diaphragm 10 side parallel to 2J. Regardless of the guidance method (visual or photoelectric), the bar image with the selected shape of the receiving diaphragm at any J / fits into its window such the way that the sum of the areas of the unlit areas of the diaphragm (areas shaded) does not change,

40

0

and consequently, the constant sensitivity of the photoelectric guidance system, which determines the measurement accuracy, which makes it possible to expand the range of application of the rangefinder, i.e. measure the distance to the object of a complex configuration, the measurement planes of which are not perpendicular to the axis of symmetry of the instrument.

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a) f.

/; Y- / g Y - / - f-2ff)

RigZ

Editor L. Zaitseva

Compiled by A. Boldin Tehred O. Vashchishina

Order 8407/44 Circulation 650Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Ryushska nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

Proofreader L. Patay

Claims (1)

LIGHT-PROJECTING LENGTH METER, containing a bar-mark, symmetrically (located projection and receiving optical branches with a mirror compensator in each of them, movable mirrors of which are rigidly fastened and placed on a carriage mounted to move along the axis of symmetry of the rangefinder, and a diaphragm mounted in front of the eyepiece in the receiving optical branch, characterized in that, in order to expand the range by providing the ability to measure distances to products of various surface shapes, the aperture window It executes as two identical isosceles trapeziums the small bases combined with equal barcode mark width and located in the measuring plane of the triangle, and the apex angle trapezoids is 75-80. with SS 0 * 7 /. f