SU1204923A1 - Arrangement for determining objects displacement - Google Patents

Description

The invention relates to geodetic instrumentation, in particular, to devices for determining object displacements. ; The aim of the invention is to increase the efficiency of the device. by increasing the detail of information and measurement accuracy.

FIG. 1 shows a general scheme of the device for determining object displacements; in fig. 2 - displacement sensor; in fig. 3 is a circuit diagram of the device.

A device for determining displacements of objects (Fig. 1) consists of an initial geodetic symbol 1, a cable 2, one end of which is rigidly attached to the original geodetic sign 1, and the other passing through blocks 3 and 4 is suspended 5, providing a constant tension of the cable 2. The sensors are made in 1 6-10 magnetic labels, rigidly attached to the cable 2, and reed switch holders mounted on additional geodetic signs 11–15. The sensors are connected via bus 16 via interrogator 17, powering 18 and measuring 19 nodes to information recording unit 20. Power is supplied to main devices and components using power supply unit 21 connected to the electrical network via programmable time relay 22.

The reed switch cassette 23 (Fig. 2) is attached to the holder 24 with screws 25 and 2, while the distance between the reed switch cassette 23 and the magnetic mark 10 is controlled by the thickness of the composing washer 27. The holder 24 is matched on a sliding fit with a cylindrical surface of the geodetic mark .15 and fixed in position with screw 28

The device works as follows.

When mounting, the reed switch cassette 23 is installed under the magnetic mark 10 parallel to the cable 2, as shown in FIG. 2. One of the outlines of each reed switch is soldered to the corresponding wire of bus 16: G1, G2, ..., Gp, where n is the number of reed switches in the cassette, and the other to the common wire of the D1 sensor. The common wires with the following sensors are connected to the wires of the bus 16: D2, DZ, ..., Dt, where m is the number of sensors in the device. Thus, the number of wires in bus 16 is (n + m) pieces.

When setting up the device, all the reed-on cassettes 23 are installed in the same position relative to the magnetic labels 10. With the assigned frequency, via the programmable time relay 22 (Fig. 3) and the pi-block.

Tany 21 includes interrogating 17 and measuring 19 nodes, and the voltage values in the circuit of each sensor are sequentially recorded using the information recording node 20. If there are displacements of geodetic signs at the time of the next interrogation, other sensors will be closed in the sensors, the current will pass through other resistors of the differentiating node 18 and, accordingly, the readings of the measuring unit-19, recorded by the information recording unit 20, change. By changing these readings, one can judge the values of displacements of various parts structures. The density of the accumulated information is regulated by the programmable turnips of time 22, up to the continuous recording of offsets, and in space by the number of installed sensors, which is practically unlimited and depends only on the specific conditions and purpose of the observations.

The processing of information is performed using a computer program, providing the calculation and printing of all the necessary characteristics of the spatial displacements of individual parts of the structure relative to the original geodetic sign and relative to each other.

The accuracy of determining the displacements is determined mainly by the diameter of reed switches, i.e. the shortest distance the cassette must travel relative to the magnetic mark to close the next contact. In the example implementation, reed switches are used with a diameter of 1.6 mm. Thus, the marginal error in determining the displacement, taking into account the tension and change in the angle of inclination of the wire, its temperature expansion, change over time, the intensity of the fields of the magnet tags and other sources of error does not exceed 0.003 m.

Fig2

Editor K. Volcheschps

Compiled by V.Lykov Tehred; 3.Paly

Order 8515/40 Circulation 650Subscription

YENIIPI USSR State Committee

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

Branch ShSh Patent, Uzhgorod, st. Project, 4

Proofreader M. Demchik

Claims (1)

DEVICE FOR DETERMINING DISPLACEMENTS OF OBJECTS, containing the original Geodetic sign, a cable, one end of which is rigidly fastened to the original geodetic sign, and a load, displacement sensors, and an information recording unit are suspended to the other end thrown over the blocks, which is characterized by “In order to increase the efficiency of the device by increasing the detail of information and the accuracy of measurements, it is equipped with additional geodetic signs, interrogating, differentiating and measuring nodes, and each displacement sensor is made in the form of a magnetic mark fixed to the cable and a reed cassette mounted on the corresponding additional geodetic mark and electrically connected to the interrogating unit, each reed switch is connected to a differentiating unit, which is connected through the measuring unit to the interrogating unit, and a recording unit is connected to the output of the measuring unit information. Figure ^{1 1} 1204923