SU1335908A1 - Device for registering thunderstorm activity - Google Patents

Abstract

This invention relates to meteorological instruments. The purpose of the invention is to make it possible to determine the duration of a thunderstorm at several different levels of its intensity. The device contains an antenna 1, a selection unit 2, a one-shot 3, a pulse counter 4, recorders 5, 7 and 8 and a generator of 6 clock pulses. The introduction of new elements and the formation of new connections between the elements of the device allows the automatic determination of the duration of lightning activity at three different levels of intensity. 2 Il. (L 00 00 ate about a 00 Figure 1

Description

The invention relates to meteorological instruments and can be used on a network of weather stations to obtain information about the duration of thunderstorm activity.

The aim of the invention is to make it possible to determine the duration of a thunderstorm at several different levels of its intensity.

FIG. 1 shows the structural scheme of the proposed device for the registration of thunderstorm activity; in fig. 2 - time diagrams of signals in characteristic points of the block diagram (the numbers of the diagrams coincide with the numbers of the corresponding points shown in Fig. 1).

The thunderstorm recording device contains a serially connected antenna 1, a selection unit 2, a single vibrator 3, a pulse counter 4 and a main recorder 5, as well as a generator of 6 clock pulses, the output of which is connected to the zeroing input of the counter of 4 pulses. There are also two additional recorders 7 and 8, the input of each of which is connected to the corresponding additional output of the 4-pulse counter.

The device works as follows.

When lightning is discharged, an alternating electromagnetic field appears in the surrounding space. These lightning signals are sensed by antenna 1 and are fed to selection unit 2, which may include frequency and amplitude selectors. Their main purpose is to isolate lightning signals from the totality of electromagnetic signals of thunderstorm and industrial origin. If the amplitude of the signal at the output of the selection unit 2 is greater than a predetermined value, then the one-shot 3 is triggered, which performs the functions of a pulse extender. When triggered, the one-shot -3 outputs a pulse with a duration of 1 s, which eliminates the multiple registration of a separate multicomponent lightning.

The pulses produced by the one-shot 3 are fed to the information input of the pulse counter 4 and are counted by it. The clock pulse generator 6 generates pulses at certain time intervals which zero the pulse counter 4. Thus, in the counter of 4 pulses during the clock interval, information is accumulated on the number of lightning occurring in the area of installation of the device. When the clock interval has elapsed, the pulse counter 4 is zeroed.

The first lightning, which takes place in the range of the device, is detected by a counter of 4 pulses and a signal appears at its main output that triggers the main recorder 5. Thus, if during the clock interval one or more lightnings occur, t . e. if the intensity of thunderstorm activity exceeds

the level set for a weak thunderstorm (for example, one lightning for 5 min), then one pulse will arrive at the input of the main recorder 5. The total duration of thunderstorm activity t ,, exceeding

,, The level established for a weak thunderstorm can be found from the expression

t, n, -t,

where n. is the number of pulses received at the input of the main recorder 5 during the whole thunderstorm;

5 T is the duration of the clock interval.

Thus, the main recorder 5 determines the duration of a thunderstorm, exceeding in intensity the level corresponding to a thunderstorm of low intensity.

If during the clock interval in the range of the device three or more lightning flashes occur, i.e. if the intensity of the thunderstorm activity 5 exceeds the level set for the average intensity thunderstorm (for example, three lightnings within 5 min), then at the first additional exit counter 4 pulses, a signal that triggers the first additional recorder 7. Therefore, the total duration of the thunderstorm activity tj, exceeding in intensity the level set for the average thunderstorm, can be found From the expression on

t, p, .t,

where n is the number of pulses received at the input of the first additional recorder 7 during the whole thunderstorm. Thus, the first additional recorder 7 determines the duration of a thunderstorm activity, exceeding in intensity the level corresponding to a thunderstorm of average intensity.

If, during the clock interval in the range of the device, there will be a drop in and more lightning, i.e., if the intensity of the thunderstorm activity exceeds the level set for a thunderstorm of strong intensity (for example, nine lightning within 5 minutes ), then at the second additional output of the pulse counter 4, a signal is generated that triggers the second additional recorder 8. Therefore, the total duration of thunderstorm activity tj, exceeding the intensity set for strong thunderstorms, can be Found from 5t, n, .T,

where Oj is the number of pulses received at the input of the second additional recorder 8 during the whole thunderstorm.

five

Thus, the second additional recorder 8 determines the duration of a thunderstorm activity, exceeding in intensity the level corresponding to a thunderstorm of strong intensity.

FIG. 2 shows time diagrams of 9–13 signals that can be observed at characteristic points of the device. Moreover, during the clock interval.

Mathematically determine the duration of a thunderstorm at three different levels of intensity, i.e. for severe, moderate and weak thunderstorms.

Claims (1)

Invention Formula A device for registering gazoznost activities containing indicated by 14, a thunderstorm divider / Q connected antenna, a selection unit and monotony exceeds the level set by the vibrator, as well as a pulse counter, a gene for a weak thunderstorm (two lightnings occurred), a clock pulse puller a clock in-histor, characterized in that, with the aim terval, denoted by 15, thunderstorm-determining the duration of a thunderstorm The value exceeds the average yield with several different (It produced six lightning flashes), and on levels of its intensity 5, it is equipped with the last clock interval’s data, additional recorders so that the input Each recorder is connected to the corresponding output of the pulse counter, and its information input is connected to the output of a single-2Q vibrator, with the output of the clock generator connected to the zeroing input of the pulse counter. indicated by the number 16, it exceeds the level corresponding to a strong thunderstorm (during the clock interval there were eleven lightning flashes). The proposed thunderstorm recorder allows auto / 4 Mathematically determine the duration of a thunderstorm at three different levels of intensity, i.e. for severe, moderate and weak thunderstorms. Invention Formula /five / ff