JPH0416721A - Water level measuring apparatus - Google Patents

Abstract

PURPOSE:To measure the water level with high accuracy by storing instantaneously measured values of the water level, operating the average value of the measured values, and correcting errors of the water level due to the disturbances. CONSTITUTION:When the water level varies, a float 2 moves up and down, thereby contracting/expanding a spring 4. The resultant pressure change is converted to the water level by a converter 3, so that the water level value (instantaneous value) is obtained. The measured value is stored in a memory device 5. The memory device 5 is endless, the size (capacity) of which allows accumulation of a required number of samples. An operating device 6 operates the average value based on the measured values accumulated in the memory device 5.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a water level measuring device.

[Conventional technology]

FIG. 3 is an explanatory diagram of a conventional water level measuring device, in which (1) shows the outer box of the water level measuring device installed on the water surface (8), (2) shows the float installed inside the outer box (1), and ( 3) is the outer box (1)
The converter (4) is a spring that connects the float (2) and the converter (3).

The conventional water level measuring device is configured as described above, and when measuring the water level, an outer box (1) is installed at a measuring point on the water surface. When the water level at the measurement point fluctuates, the float (2) moves up and down, and the spring (4) expands and contracts accordingly, and the pressure change caused by this expansion and contraction is converted into a measured water level by the converter (3), and the water level is adjusted accordingly. value (instantaneous value) is obtained.

(Problems to be Solved by the Invention) In the conventional water level measuring device as described above, since the water level is measured at one point, water level vibration due to transient turbulence of a part of the water surface due to discharge of stored water, etc., or due to wind force. Since partial water level changes due to generated waves are directly measured as water level, highly accurate measurement values cannot be obtained.

In order to eliminate such disturbances, measurement points on the water surface must be carefully selected, but this selection is extremely difficult.

This invention was made in order to solve this problem, and aims to provide a water level measuring device that can obtain highly accurate measurement values by eliminating water level vibrations, water level changes, etc. that occur locally on the water surface. The purpose is

[Means to solve the problem]

The water level measuring device according to the present invention includes a float, a spring that expands and contracts in accordance with the vertical fluctuations of the float, a conversion device that converts pressure changes caused by the expansion and contraction of the spring into a water level value, and a water level value that is converted by the conversion device. A memory device that stores water level values and an average value of the water level values stored in this memory device are used to calculate the true water level value by calculation.

[Effect]

In this invention, since the true water level value is averaged by the calculation device based on the measured values stored in the memory device,
Even if water level vibration or water level changes occur locally on the water surface, errors are corrected and highly accurate water level values can be obtained.

〔Example〕

FIG. 1 is an explanatory diagram showing an embodiment of the present invention. In the figure, (1) to (4) are the same as the conventional device described above, (5) is a memory device that stores the water level value (instantaneous value) transmitted from the converter (3), and (6) is a memory device. This is a calculation device that calculates the average of measured values stored in the device.

Next, the operation will be explained. In the above configuration, first, as in the prior art, when the water level at the measurement point changes, the float (2) moves up and down, and the spring (4) follows this.
) is expanded and contracted, and the pressure change caused by the expansion and contraction is converted into a measured water level by the converter (3), and a water level value (instantaneous value) is obtained.

When the measurement value is calculated by the conversion device (3), the memory device (5)
). As shown in FIG. 2, the structure of the memory device (5) is endless, and its size (capacity) is:
It is possible to accumulate the number of samples of the desired average. The calculation device (6) performs an average calculation based on the measured values stored in the memory device (5). The calculation formula is as follows.

Average water level measurement value for N seconds = ΣMeasurement value for N seconds / 'Number of stored measurement values Note that in the above embodiment, the displacement of the float (2) is calculated by the spring (
Similar effects can be obtained by converting by a mechanical method through 4) or by using an electrical conversion method such as replacing the resistance value.

〔Effect of the invention〕

As explained above, this invention has a simple structure that includes a memory device that stores instantaneous water level measurement values and an arithmetic device that averages these water level measurement values. This has the effect of correcting errors caused by external disturbances and measuring water levels with high accuracy.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram of a memory device (5), and FIG. 3 is a block diagram showing a conventional water level measuring device. In the figure, (1) is an outer box of the water level measuring device, (2) is a float, (3) is a converter, (4) is a spring, (5) is a memory device, and (6) is a calculation device. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] A float, a spring that expands and contracts in accordance with vertical fluctuations of the float, a conversion device that converts pressure changes due to the expansion and contraction of the spring into a water level value, and a memory device that stores the water level value converted by the conversion device. A water level measuring device comprising an arithmetic device that calculates the average value of the water level values stored in the memory device as a true water level value.