SU40612A1 - Device for determining additive constant total station - Google Patents

Description

The definition of additive constant tacheometers is associated with accurate horizontal measuring of the segments, which is always associated with known difficulties and takes at least two people.,

The proposed device eliminates the measurement of long-invar wire or tape.

In the attached drawing of FIG. 1 and 2 depict the scheme of the device; FIG. 3- a device for installation used in the scale device.

Let on schema.fig. 1, and 2, the letter T denotes a total station with an additive constant equal to ao.

With an additive constant Co, the total station measures the distance from any point to a point lying on the optical axis at a distance a from the vertical axis of the instrument.

In the position of FIG. 1 is placed over the vertical axis of the instrument to the ridge R, and at some arbitrary distance EQ a mirror M of external silvering is exposed. The image of the scale R in the mirror / I is located obviously at a distance of 2Es from the tool axis. The countdown to the total station will give a distance

1 -GO (1)

In the position of FIG. 2 mirror M for (456)

is placed on the scale of R. The counting on the tacheometer will give the distance EQ, reduced by the value of "", i.e.

(2) (3)

 - AO

Made up the difference

E, -2E

and substituting in (3) the values of Ej and E., we get f

EI - 2E. - - “o - 2E + Yao.

The fixture for the installation used in the scale device is as follows. On the bracket, rigidly fastened to the table on the welded legs of metal pipes, the scale is suspended. Scale I is inserted into the yoke, which allows.

a) setting the scale to a horizontal position on level 3, carried out by turning around axis 7 with screw 5;

b) installation of the tool axis in the plane of division of the scale along the optical plummet 4;

c) moving the scale in the horizontal direction perpendicular to the line of sight with the help of a rack and tribe 2.

The scale is applied on the glass and illuminated on the side with a special condenser 8.

The collimator 6 attached to the bracket serves to install the instrument tube perpendicular to the scale division plane. The last 1 setting is performed by aiming the instrument tube at the crosshair of the collimator o and turning the instrument alidade from this position by 90 ° along the horizontal limb.

For double image tacheometers, a vernier must be applied on the scale, and for ordinary tacheometers it is divided into millimeters and a rotary plane-parallel plate is put on the scale holder, the frame of which can be shifted along divisions and is used for counting fractions of a millimeter so that the additive will be fixed measured with an accuracy of the order of 1 mm. This flat parallel plate (with a vertical axis of rotation) is not shown in the drawing, so as not to complicate the latter.

The subject of invention and.

An apparatus for determining an additive constant of the instrument, wherein the use is located above the vertical axis of rotation of the instrument R scale, but at some arbitrary distance from the instrument, a mirror M for measuring a count of the total station distance EI mirror image in a mirror M R scale to obtain an additive a constant tachymeter, after measuring with a tachometer reading, the distance EZ to mirror M by replacing the latter with the scale / ,, from the ratio a,; 1 - 2Ez.