SU363923A1 - DEVICE FOR MEASURING THE MEDIUM DIRECTION OF THE WIND - Google Patents

Description

one

The invention relates to the field of meteorology and can be used in automated meteorological stations.

The known devices of analogous purpose are multichannel and do not deny the direct reading of the measured parameter.

The purpose of the invention is to reduce the number of channels and to ensure the possibility of making measurements with the variability of the retro direction to + 180 °.

A distinctive feature of the proposed device is that in it the input of the pulse counter is additionally connected to the generator of modulating pulses through the correction input key, and the inputs of the control trigger are connected to the outputs of the sensor position indicators in sectors O-90 ° and 270-360 ° through the coincidence circuits the control inputs of which are connected to the outputs of the indicators of the direction of rotation of the sensor, as well as the outputs of the indicator of the initial position of the sensor.

FIG. 1 shows a block diagram of the described device; in fig. 2 - time diagrams of signals at the output of the sensor,

The device works as follows.

Under the influence of the air flow, the sensor 1 is set to the position corresponding to the current value of the direction

2

wind Pa of the sensor output are two reference imgples .2 and (see fig. 2), shifted relative to each other by 90 ° but phase, as well as a series of short counting pulses 4, the time shift of which L relative to the reference pulses 2 is directly proportional to the direction and inversely proportional to speed. The time shift / i is converted by the trigger 5 into a variable pulse, which is filled in the coincidence circuit 6 by the pulses from the generator 7, the time T is determined by the setting device 8. At the same time, the relations are fulfilled that the total number of pulses at the output of the generator 7 during time T corresponds to a reading of counter 9 of 360 °. The number of pulses transmitted through circuit 6 to the counter input is proportional to the duration of unit time intervals allocated by trigger 5 during time T, i.e., corresponds to the average direction and does not depend on speed.

The frequency of the pulses of the generator 7 is set sufficiently low, comparable to the frequency of the pulses at the output of the sensor /, but uncorrelated with it, which made it possible to reduce the volume of the counter 9, while maintaining the above proportionality.

To eliminate the flaw due to the break. Characteristics of the transformation at the point 360 ° -0 ° in the device applied a conditional shift of the beginning

counting at 360 ° in those cases when the transition of the readout pulse from zone d (see Fig. 2) to zone a occurs. Permission to enter corrections is given to control circuit 10, which opens the Y / coincidence circuit and transmits pre-filling pulses to the input of counting 9. Since the circuit 11 is open during the complete rotation of the sensor converter I, the number of additional pulses is equivalent to adding 360 ° with a single count. In cases where the resulting amount after measurement exceeds 360 °, an automatic subtraction of 360 ° occurs due to a reset of the counter at 360 and the initial start of the account. In order to use one generator of yush, nh pulses, the latter are sent through a delay stage 12, installed before the joint-mode scheme 11. Correction control input circuit 10 contains decanters 13-16, which for each turn of the sensor converter 1 are determined by the yellow sensor with an accuracy of 1 / 4 turns, i.e., zones a, b, c, d are detected (correspond to the sectors 0-90 °, 90-180 180-270 °, 270-- 360 °) (see fng. 2). Denngfrator 17 distinguishes at the beginning of the measurement of the zone c, d (sector 1807 360 °) from zones a, b (sector O-180 °), this initial position is assigned by triggers 18 and 19. The operation time of the decoder 17 is determined by the counting circuit 20, highlighted the first working turn of the sensor converter.

The trigger 18 in the process of further operation is not controlled, and the trigger 19 gives the irn output a command to enter the correction and can switch in the process of measuring the input through the 360-0 ° point using signals from the coincidence circuit 22, 21, 23, 24.

Let us assume such an initial igo that the sensor is located in zones a or b. In this case, the triggers 18, 19 are set to a position at which the input and correction is allowed. An enable signal is applied to the circuit 23, and a blocking signal 22 is applied to the circuit 22. Further, the signal from the decoder 13 (zone a) can pass through the circuits 23, 24 to the input of the trigger 19, not changing the state of the latter.

If not entering zone d, the signal from the decoder 16 passes through the circuit 21 and triggers trigger 19, prohibiting entry of the correction. Further movement to the zone does not change

trigger position 19. When the signal is reversed, the signal from the output of the decoder 14 (zone B) does not act on the trigger 19, and the snigal from the depigrator 16 is preceded by / the signal from the output of the decoder / 5 (zone c), which flips the trigger 25, prohibiting the signal from passing through scheme 21. Thus, when moving to zone d through zone c without crossing the point 0-360 °, the state of trigger 19 does not change if the initial position was in sector O-180 °.

In the initial position in zones c, d, the operation of the control circuit occurs in a similar way, only at the initial moment the entry of the correction is not allowed. Permission is given prn

transitions nz zone d to zone a and on; the trigger 26 prevents the flip-flop of trigger 19 when transitioning from zone c to zone a, originating through zone b, i.e., without crossing point O-360 °.

PREDEMET and lObrete and n

A device for measuring the average wind direction is contained, its speed sensor and wind direction sensor, the key for entering corrections with

a coincidence circuit, a control trigger associated with the input of a pulse counter, an oscillator is modulated; through the key to the introduction of amendments, and the trigger inputs are controlled by control with the indicator outputs

sensor position in sectors O-90 ° n 270-360 ° through coincidence circuits, control, the strokes of which are connected with the outputs of the sensors of the direction of rotation of the sensor, and with the outputs of the displaced position 1

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