JPH01270609A - Apparatus for measuring wave cycle - Google Patents

Abstract

PURPOSE:To automatically and excellently measure the wave cycle of the surface of the sea, by measuring the distance between a predetermined fixed position and the surface of the sea and continuously comparing the measured data with the measured data obtained by delaying said data. CONSTITUTION:In a distance count part 14, the distance from a transmitting- receiving part 12 to a reflecting surface is measured on the basis of the time difference from the transmission of a sonic wave to the reception thereof in the transmitting-receiving part 12. Next, the measured result of the distance count part 14 is successively stored in the shift register 16A of a delay part 16 to successively shift data. As a result, the delay of a time is generated between the measured data stored in the register 16A and the measured data stored in a shift register 16N. Next, the measured data of the registers 16A, 16N are temporarily stored in memories 18A, 18B and further outputted to a comparator 18C to be compared with each other. The output signal thereof is inputted to a counter part 18D to measure the cycle thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a distance measuring device that uses, for example, sound waves, and particularly to a wave period measuring device that measures the period of waves.

[Conventional technology]

In general, distance measuring devices that use sound waves include depth sounders that measure the distance from a wave transmitting/receiving unit installed on the ocean surface to the ocean floor, and upsonars that are grounded on the ocean floor and measure the distance from the ocean floor to the ocean surface. be.

These distance measuring devices measure a corresponding distance based on the time difference between the transmission and reception of sound waves.

By the way, as a wave period measuring means, conventionally, the distance data between the sea surface and the seabed obtained using the above-mentioned distance measuring device is continuously recorded over time, and the values are manually measured. A method of measuring the wave period is commonly used.

[Problem to be solved by the invention]

However, in the conventional techniques as described above, the measurement is performed manually, which is disadvantageous in that the measurement requires a great deal of effort and time.

[Purpose of the invention]

The present invention has been made in view of this point, and an object of the present invention is to provide a wave period measuring device that can automatically and satisfactorily measure the wave period.

[Means to solve the problem]

The present invention provides distance measuring means for measuring the distance between a predetermined fixed position and the sea surface; a delay means for delaying measurement data of the distance measuring means; delayed measurement data of the delay means; and measurement of the distance measuring means. The present invention is characterized by comprising period measuring means for continuously comparing data and measuring the period of the comparison results.

[For production]

According to the invention, distance data between a predetermined fixed position and the sea surface is measured and compared with delayed distance data.

When comparing undelayed data and delayed data, the magnitude relationship is reversed at the same cycle as the wave cycle. Therefore, the period of the waves can be determined from the period of the distance data comparison result.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a circuit block configuration of an embodiment of the present invention. In this figure, the wave period measuring device W10 includes a wave transmitting/receiving section 12. It is composed of a distance counting section 14, a delay section 161, and a period measuring section 18.

Among these, the wave transmitting/receiving unit 12 is installed on the seabed 20 as shown in FIG. 2(A), or is placed floating on the sea surface 22 as shown in FIG. 2(B). . In the case of FIG. 2A, the sound waves output from the wave transmitting/receiving section 12 are reflected by the sea surface 22 and are incident on the wave transmitting/receiving section 12.

Therefore, if there are waves on the sea surface 22, the traveling distance of the sound waves changes accordingly.

Furthermore, in the case of FIG. 2B, the sound waves output from the wave transmitting/receiving section 12 are reflected by the seabed 20 and are incident on the wave transmitting/receiving section 12. In this case, the position of the wave transmitting/receiving unit 12 with respect to the seabed 20 changes depending on the waves on the sea surface 22, so that the traveling distance of the sound wave changes depending on the degree of the waves.

Next, the output side of the wave transmitting/receiving section 12 as described above is connected to the input side of the distance counting section 14. This distance counting section 14
In this case, the distance between the seabed 20 and the sea surface 22 is measured using the time difference between the transmission and reception of sound waves in the wave transmitting/receiving section 12. The measurement interval at this time, that is, the output cycle of the sound waves by the wave transmitting/receiving unit 12, is set to a value that is sufficiently small compared to the cycle of waves observed during boat fishing.

Next, the output side of the distance counting section 14 as described above is connected to the input side of the delay section 16. This delay section 16 includes a plurality of shift registers 16A and 16B.

. . , 16N, and data is sequentially transferred to these registers.

That is, the data stored in the shift register 16A is delayed by being transferred to the shift registers 16B, 16C, . . . and then stored in the shift register 16N.

Among the shift registers of the delay section 16, shift register 1
6A and 16N are memories L8A and 18 of the period measuring section 18.
B, respectively, and the output side of these memories is
Each is connected to the input side of the comparator 18C. Memories 18A and 18B are shift registers 16A and 16N.
This is used to temporarily store the data stored in each of the , and these data are compared by a comparator 18C.

Next, the output side of this comparator 18C is connected to the input side of a counter part 18D. This counter portion 18D counts changes in the logical value of the output of the comparator 18C.

Next, the overall operation of the above embodiment will be explained with reference to FIG.

First, the wave transmitting/receiving section 12 receives a reflected signal from the sea surface 22 (in the case of FIG. 2(A)) or the seabed 20 (in the case of FIG. 2(B)), and this received signal is transmitted to the distance counting section 14. is output to.

Next, the distance counting unit 14 determines whether the wave transmitting/receiving unit 12
The distance from the reflection surface to the reflection surface is measured. As described above, this distance measurement is repeatedly performed at sufficiently narrow time intervals with respect to the wave cycle.

Next, the measurement results of the distance counting section 14 are stored in the shift register 16A of the delay section 16 in order. At this time, the measurement data stored in the shift register 16A is transferred to the shift register 16B, the measurement data stored in the shift register 16B is transferred to the shift register 16C, etc.
Data is shifted in this order.

Then, a delay of time Δ will occur between the measurement data stored in the shift register 16A and the measurement data stored in the shift register 16N. FIG. 3(A) shows the change in measurement data over time in an analog manner.

The solid line LA in the figure is the measurement data stored in the shift register 16A, and the broken line LB is the measurement data stored in the shift register 16A.
This is measurement data stored in N and delayed by a time Δ.

Next, the measurement data of the shift registers 16A and 16N as described above are temporarily stored in the memories 18A and 18B, respectively, and further outputted to the comparator 18C for comparison. FIG. 3(B) shows the comparison output of the comparator 18C with respect to the measurement data of FIG. 3(A). This output signal is input to the counter part 18D, and its period is measured.

If we look at Figure 3 in detail, we can see that the graph intersects at the same period as the wave period, when we look at the magnitude relationship between the measurement data that is not delayed (LA) and the measurement data that is delayed by Δ (LB). However, the size relationship is reversed. Therefore, the same figure (B)
The period T, , T2 . of the output of the comparator 18C shown in . T
,...corresponds to the wave cycle,
The value will be measured by the counter portion 18D.

It should be noted that the present invention is not limited to the above-mentioned embodiments; for example, the device configuration shown in FIG. 1 can be modified in various ways so as to achieve the same effect.

In addition, in the above embodiment, the wave transmitting and receiving section was installed on the seabed.
It goes without saying that a fixed position underwater or above the water may be used. Furthermore, the wave transmitting section and the wave receiving section may be installed separately.

Further, the distance between the fixed position and the sea surface may be measured using something other than sound waves.

[Effects of the Invention] As explained above, according to the present invention, the distance between a predetermined fixed position and the sea surface is measured, and this measured data is continuously compared with delayed measured data. Therefore, the effect is that the wave period on the sea surface can be automatically and accurately measured.

[Brief explanation of the drawing]

Fig. 1 is a circuit block diagram showing the configuration of an embodiment of the wave period measuring device according to the present invention, Fig. 2 is an explanatory diagram showing the installation position of the wave transmitting and receiving section in the embodiment, and Fig. 3 is the operation of the embodiment. It is a time chart showing. 10... Wave period measuring device, 12...
Wave transmitting/receiving section, 14... Distance counting section, 16...
...Delay section, 18... Period measurement section.

Claims (1)

[Claims] (1) A distance measuring means for measuring the distance between a predetermined fixed position and the sea surface, and a delay means for delaying the measurement data of the distance measuring means, and the delayed measurement data of the delay means and the distance measuring means What is claimed is: 1. A wave period measuring device, characterized in that it is equipped with a period measuring means for continuously comparing measured data of and measuring the period of the comparison results.