SU572734A1 - Device for registering seismic processes in digital code - Google Patents

Description

one

The invention relates to a measurement technique and can be used mainly in the field of seismometry, as well as in other areas of measurement technology, in particular, in devices with galvanometric registration.

Known automatic stations such as ACC 1 and ZSS 2, leading the registration of seismic processes in analog form.

When processing information from these devices using computer technology, matching input devices are needed in the computing machines, which creates known difficulties.

A digital seismic survey station 3 is also known, and a seismic receiver, which transforms an analog electrical signal into a light beam deflection, consisting of a galvanometer with a mirror mounted on a moving frame, an illuminator and a mirror scanning mechanism, and a light beam deflection converter into a digital code, in which The digital signal is pre-amplified by a special DC amplifier electrical signal from seismic receivers.

Such a system, due to the drift of the amplifier, its own noise and the inadequacy of the gain factor, cannot ensure a high accuracy of registration in the digital code.

The purpose of the invention is to improve the measurement accuracy.

This goal is achieved by performing in the proposed device an analog co-converter in the form of a galvanometer, in which at an angle not more than 3 ° to the working mirror), an additional fixed mirror is installed, and the beam scanning system.

This allows one to convert the magnitude of the angular deviation of the moving system of the galvanometer into the magnitude of the time interval that can be measured with high accuracy. The advantage of the proposed device is that it uses

The classical seismic process recording system, namely, a coupled seismic receiver-galvanometer system, which is an electromechanical filter, provides for the necessary selectivity during recording, which is not provided by other known devices.

The drawing shows a block diagram of the proposed device, consisting of a light source (light bulbs) 1, lens 2,

rotating mirror polyhedron 3, galvanometer 4 with two mirrors: non-moving and nodvizhnimi, reflective mirror 5, photoelectric sensor 6, forming device 7, counter 8, pulse generator 9, aperture-gap 10.

The device works as follows.

The light beam from the light source 1, the passage through the lens 2, falls on the edge of the mirror polyhedron 3 rotating at a constant speed. Reflected from the face of the beam, turning in space, at certain points in time falls on the subBinache and fixed mirror installed in the galvanometer 4 (working mirror is fixed on the moving system of the galvanometer, stationary - rigidly fixed on its body). The initial angle between movable and fixed mirrors is 3 °. The rays reflected from the working and stationary mirrors are again reflected from the mirror polyhedron 3 and through the mirror 5 fall at certain points in time to the light detector (photoelectric sensor 6), which converts light pulses into electrical pulses. The stationary mirror of the galvanometer 4 in the plane of motion of the rays is rotated relative to the working mirror in such a way that the beam reflected from the stationary mirror and then the beam from the moving mirror always hit the light receiver. At a constant rotational speed of the polyhedron, a definite time interval between the electrical pulses at the output of the light receiver corresponds to a certain angle between the fixed and movable mirrors. The effect of an electric recorded signal on the galvanometer 4 causes a change in the angle between the mirrors and, consequently, a change in the time interval between the electric pulses. The pulses from the output of the light-receiving device after processing in the forming device 7 serve to control the counter 8. To the input of the counter 8 from a special generator, pulses are received with a high constant frequency. With each pair of control pulses from the light receiver, the counter is turned on for counting only for the time interval between these control pulses. The number of counted pulses from the generator is in this case proportional to the angle between the fixed and movable mirrors. From the output of the counter, the information converted in the described manner into a digital code is submitted for registration. The command that transmits information from the counter, as well as resetting the counter and preparing it for the next cycle, is provided either by installing a special additional light receiver, or by using the first control pulse with a corresponding delay.

The application of the proposed device allows to significantly improve the accuracy of recording and the speed of processing the information obtained when registering seismic processes. In addition, it is possible to reduce the amount of material on which the information is applied. The absence of

15 in the proposed device in the analog recording path of DC amplifiers with instability and noise, as well as the presence of an electromechanical filter in the form of a coupled seismic receiver-galvanometer system significantly improves the recording accuracy. The proposed device provides an amplitude resolution close to the full scale.

Claims (3)

1. Equipment and methods of seismometric observations in the USSR. M, Science, 1974 5 ch. 2-3. 2. Shnirman G. L. The epicenter seismic station. Proceedings of the IPE No. 35 (202) 1964. 3.Borkovsky G.M., TsukernikV. B. Tsifrova seismic survey station SSTs-1, M., VR1EMS, series “Regional, exploration and production geophysics, vol. 41, 1969. / i.r in Peei cmpcfpye bfu S OHCf yfaffU out ° 3cfpee t / C poScj-vi, .- u. -JpCLjecc peaSprazov / b:} / / r