SU805222A1 - Geophysical data gathering device - Google Patents

Description

(54) GEOPHYSICAL INFORMATION COLLECTION DEVICE

one

The invention relates to instruments used in geophysical research, in particular, devices for recording time-varying parameters of processes or processes, and can be used in seismometry, research on geomagnetism, etc. for collecting information that is transmitted via the communication line from the sensors to the registration point, where data is accumulated and processed. ...

A known system for transmitting or accumulating analog quantities, in which the input electrical signals are converted into carrier frequency by means of the modulators, the frequencies are summed and transmitted over the communication line to the collection center. The received carrier frequency mix is recorded, firstly, on a single-track tape recorder, and secondly, after separating these clock PST and demodulation, the recovered signals are recorded on a multichannel analog recorder or device with a video record, for example, a light beam oscilloscope, and third, the recovered electrical signals are recorded with a digit equipment P.

The disadvantage of such a system is. limiting the accuracy and dynamic range during recording, especially when recording a mixture of carrier frequencies or recovered signals by analog storage devices. The arising distortions sometimes make impossible the automated spectral processing of geophysical information.

Closest to the Offered is a telemetry observation system designed to collect seismological information and includes sources of electrical signals, frequency modulators, a communication line, encoding transducers, a recording unit and a recording control unit {2J

The disadvantage of this system is the complexity and limited accuracy of the recording of the various components of the phenomena under investigation, due to signal transformations, which complicates further processing of records according to kinematic and dynamic parameters and is especially evident in polarization analysis.

Claims (2)

The purpose of the invention is to increase the accuracy of registration. The goal is to achieve a TRF that in the geophysical information acquisition device, containing serially connected sources of electrical signals, frequency modulators, a communication line, as well as encoding transducers, a recording unit and a control unit, three conversion time reference selectors are entered into it, at the same time, these blocks are connected to the communication line by the first inputs, and the second input of the first block of reference selection is connected to the control unit, and its output is connected to the second inputs These are the main units of the choice of reference, and the outputs of all these blocks are connected to c-encoders and converters. Increased accuracy. Registration of the spectral characteristics of the geophysical process is also achieved by the exception of the operation of restoring the waveform and reducing the non-simultaneity of samples by components. The drawing shows a block diagram of the proposed device for collecting geophysical information. The device contains sources 1, 2 and 3 of electrical signals, for example, seismometers, frequency modulators 4, 5 and 6, communication line 7, blocks 8, 9 and 10 of the choice of reference for the conversion time intervals and registration control unit 14, which buses 15 and 16 is connected to block 8 and converters And, 12 and 13. The device operates as follows. Electrical signals from the output of sensors 1, 2 and 3 are converted by frequency modulators 4, 5 and 6 into carrier hours, tots, respectively, f, fo ± D1 Gg m (fo ± Af) (f, ± uf) where t is the average frequency ; d - frequency deviation, i ii4ti. At the output of the link 7, the carriers are allocated in the form of square impulses with a duty cycle close to 2 and arrive at the first inputs of blocks 8, 9 and 10, which perform the functions described below. With the arrival of 15 on the control unit 14 to the command 8, the start of the measurement in the form of two pulses following the digital conversion rate, in block 8, the beginning of the conversion of the time interval generated from the signal with the lowest carrier frequency f is determined by the nearest positive or negative front. At the same time, at the output of block 8, a pulse is also generated, synchronized with the start of the time interval of the transformation obtained from the lower carrier frequency fj. This impulse arrives at the second inputs of the remaining blocks 9 and 10 of the choice of origin, allowing them to make the choice of the beginning of convertible time intervals obtained from higher carrier frequencies f fa in the same way as in block 8, so that the maximum error is the non-simultaneity of samples for different channels will not exceed the second half-period in order of increasing carrier frequency. In each of. blocks 8, 9 and 10, after selecting the origin of the converted time intervals, is determined and their end is calculated by counting the periods of carrier frequencies by a divider, and the division factor in different channels is different and is Ki, where i I, 2, 3, and 1, as a result what the average duration of time intervals allocated at the outputs of blocks 8, 9 and 10 is the same and corresponds to the frequency fo- As a result, each selected time interval is K ;, periods of the carrier frequency. The coding converters II, 12 and 13, in the presence of a filling frequency along the bus 16, in a known manner convert the time slots into multi-digit digital codes that go to the recorder. The control unit 14 provides for the registration of an absolute time code and other necessary signals, including those mentioned above. The proposed device eliminates the need to carry out at the registration point a series of analog and analog-to-digital conversions above the signal to produce digital recording of events, which improves the accuracy of recording and ensures the unambiguity and reliability of the results of interpretation of multi-channel recordings using a computer. An inventive geophysical data acquisition device comprising serially connected sources of electrical signals, frequency modulators, a communication line, as well as encoding transducers, a recording unit and a control unit, characterized in that, with the purpose of improving the recording accuracy, three the unit for selecting the starting point of the conversion time intervals, whereby the indicated units are connected to the communication line by the first inputs, and the second input of the first reference unit is connected to the control unit, and its output is connected to the second inputs of the rest of the block of selection of the origin, and the outputs of all these blocks are connected to the coding converters. Sources of information taken into account in the examination I. Donner F. System zur Obertragung Oder Speicherung mehrerer analog meer wette- “Radio Fernsehen Elekironik. 1974, H. n. s 345-350, H. 12, s 394-398r. 2. ULOMOV, B.I., Katrenko, V.G., et al. Automation of the collection and processing of seismological information. FAN Uzbek: SSR Tashkent, 1976. with. 39-47 (prototype).