JP3088965B2 - Measuring device for changes in water level, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for remotely measuring an amount of change, such as a water level, at a position remote from a changing surface.

[0002]

2. Description of the Related Art For example, a float type water level meter is a general method for measuring a water level, and in many cases, it is still used as a main water level meter at present. However, the float type water level gauge was limited to obtaining an accuracy of ± 1 cm at a head level of 100 m. Another type of water gauge uses a quartz pressure gauge, but it has a problem that a change in specific gravity, that is, a change in water temperature causes an error. An ultrasonic type water level meter is also known, but has a problem in the measurement range and accuracy, and cannot be used if it exceeds 10 m.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to make it possible to measure, for example, a water level of 100 m with an accuracy far exceeding ± 1 cm.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is capable of reflecting a laser beam, being placed on the above-mentioned changing surface to indicate its height, It consists of a reflector that does not sink into the water and a laser rangefinder that directs the laser beam to the reflector, captures the reflected beam, and calculates the distance to the reflector. We have taken measures.

[0005] In order to restrain the movement of the reflector, the reflector can be provided in a take-out means for taking out an amount of change in the vertical direction by removing a motion that may occur on a changing surface represented by the water surface. As the reflector, even when sprayed on a snow-covered surface or a sand surface, it hardly changes the form of the surface, has a property of not immersing in snow or sand, and easily obtains a required spray density, coloring or Uncolored metal foil, resin pieces, resin foam,
What consists of minute pieces, such as a powder, can be used.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A change amount measuring apparatus according to the present invention is a device for remotely measuring a change amount such as a water level at a position away from a change surface 11. When the present invention is applied to a water level gauge, the changing surface is naturally the water surface 11. However, when the present invention is applied to a snow depth gauge, the changing surface is a snow surface, and when the present invention is applied to a sedimentometer, it is a sand surface.

Liquid surface or other changing surface 1 represented by water surface
A take-out means 10 can be provided in order to take out the possible movements of the device 1 and take out the amount of vertical change.
When the change surface 11 is a water surface such as a reservoir, this is a means for taking out only a change amount by preparing a measurement environment so as not to be affected by an external force caused by an earthquake, a change in air pressure, or other causes such as wind and snow. Therefore, there is a case where it is unnecessary for the change surface 11 which has no influence or can be ignored.

Means 1 for taking out the amount of change with respect to the water surface
An example of 0 is a type of well or tube with a communicating structure. FIG. 1 shows a variation extracting means 10 composed of an observation well, which has a side port 12 as a communication port below the water surface and that the observation well is open to the atmosphere. FIG.
An example in which a tube thinner than FIG. 1 is the change amount extracting means 10 is shown, but a lower end opening 13 of the tube is a communication port. The same applies to the example of FIG.

In the apparatus of the present invention for performing measurement using the laser beam B, the reflector 15 is placed on the changing surface 11 so that the laser beam B can reliably catch and reflect the changing surface 11. Since the reflector 15 naturally floats on the surface of the water and indicates the height of the changing surface 11, it must not sink below the surface of the water at the time of measurement, and must sink into snow or sand. There must not be.

The most suitable reflector 15 for the water level gauge is of the floating type floating on the water surface. This is because the height of the change surface 11 is displayed as it is by floating. In the example of FIG. 1 in which the observation well is used as the extraction means 10, the following configuration is adopted in order to arrange the reflector 15 at a position where the laser beam B is directed .

That is, a configuration is employed in which minute pieces floating on the water surface are dispersed in the tube as the reflector 15. For this purpose, a colored or uncolored metal foil floating on the changing surface 11, a resin piece, a resin foam, a powder, or the like can be used. The reflector 15 made of such a small piece can measure the water level and other liquid levels, and even when sprayed on a snow-covered surface or a sandy surface, does not substantially change the form of the surface, and has a required spray density. Therefore, it is suitable for the reflector 15 such as a snow depth gauge and a sediment gauge.

A laser distance meter 20 is provided for directing a laser beam to the reflector 15 and picking up the reflected beam from the reflector 15 to calculate the distance to the reflector 15. The laser range finder 20 measures the time required for the laser pulse from the transmitter to travel toward the target reflector 20 and return to the detector by accurately measuring the time required from the installation point to the reflector 15. Use something that can measure distance. As schematically shown in FIG. 2, data detected by the detector 21 of the laser range finder 20 is input / output to / from an interface such as RS-232C, and processed by the signal converter 22. Is converted to the head level. Note that a BCD signal can be output as a telemeter signal, and data can be directly input to a personal computer, a data logger, or the like, so that data can be easily collected.

In the above example, the reflector 15 is installed vertically below the laser range finder 20. However, the reflector 15 may be installed on an inclined ground. The obtained data is subjected to vertical conversion to obtain a target value.

In the apparatus of the present invention having such a configuration, in order to measure the water surface height that changes due to precipitation or sunshine, that is, the water head water level, the reflector 15 that can move up and down according to the change of the change surface 11 is measured. It is only necessary to emit the laser beam B. Since This equipment has been installed by performing a dust and moisture-proof structure 24 to the observation house, your it not also be affected by moisture and dust from the surface of the water. For example, the wavelength is 670 nm.
In the case of using an IEC standard class II laser using visible light, a water head level of 100 m could be measured with an accuracy of ± 3 mm.

[0015]

Since the present invention is constructed and operates as described above, the amount of change of the changing surface typified by the water surface is taken out by the taking out means, and the amount of change is taken to the reflector placed to indicate the changing surface. By directing the laser beam and calculating the data obtained by the detector, it has the effect of enabling remote measurement with an accuracy far exceeding ± 10 mm for the conventional water head level of 100 m. . In particular reflector in the present invention have a property of not dive like snow and sand, other snow and sedimentation of the water level measurement, or storage amount in the tank, such as a gate opening degree can also be suitably determined.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing Embodiment 1 of a change amount measuring device according to the present invention.

FIG. 2 is a block diagram showing an outline of a measuring device.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hirohiko Okiyama No. 1, 1351, Miho-cho, Midori-ku, Yokohama-shi, Kanagawa Prefecture 5-202, Horest Hills Miho Kohei 3-13529 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01F 23/28 G01F 23/40 G01F 23/56

Claims (1)

(57) [Claims] 1. An apparatus for remotely measuring an amount of change such as a water level at a position remote from a change surface thereof, the device being capable of reflecting a laser beam and being placed on the change surface. Sprinkle on snow or sand to indicate height
However, their surface morphology hardly changes, and snow and sand
Easy to get required spray density
No, colored or uncolored metal foil, resin pieces, resin foam,
Water level, etc. characterized by comprising a reflector consisting of minute pieces such as powder, and a laser range finder for directing the laser beam to the reflector, capturing the reflected beam and calculating the distance to the reflector. For measuring the amount of change in