JPS6025413A - Method and device for leveling rod scale detection in leveling - Google Patents

Abstract

PURPOSE:To make an articulate and accurate read by photodetecting horizontal luminous flux emitted from a level on a code scale on a leveling rod, projecting an image of the scale on an image converter provided to the level and detecting the photodetection position, and displaying a height value digitally. CONSTITUTION:The leveling rod 1 stood at a measurement point is irradiated with the horizontal luminous flux F emitted by the level 3 to point the leveling rod 1 through the collimator of the level 3. A focus adjustment of the image is made over a look at a display device 12 and a clear image of the code scale 2 is projected on the display device 12 through the image converter 11. A position detecting circuit connected to the image converter 11 detects the photodetection position of the horizontal luminous flux F on the code scale 2 automatically and a scale reading circuit reads the code scale 2 at the photodetection position simultaneously. The read numerical value is displayed on the display device 12 together with the image of the code scale 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for automatically detecting the level scale of a leveling rod at an observation point.

Conventional leveling generally uses an optical telescope, obtains a horizontal reference line with a bubble tube or an automatic correction device, and then reads the scale of a leveling rod to determine the elevation.

By the way, in this method, the scale is difficult to read and the scale of the leveling rod is read artificially, so it requires considerable skill to read, and there are many cases of misreading. As a result, there were many typos.

In order to solve the above-mentioned conventional problems, this invention provides a photoelectrically convertible code scale on the leveling rod, projects the scale on the spirit level onto an image display using a television camera, and reads and displays this scale with a photoelectric converter. Elevation values are automatically digitally displayed on the instrument, making them easy to read and reliably preventing misreadings and errors, and recording the data on the display on a computer, etc., to mechanize and systemize leveling. This paper proposes a leveling method and device.

The embodiments of this invention shown in the drawings will be described below.
A leveling rod 1 set up at a measuring point is provided with a code scale 2 that can be photoelectrically converted.

The leveling instrument 3 installed at the observation point has a luminous flux emitter 4 such as a laser light emitting element such as a semiconductor laser or an infrared light emitting element installed inside thereof, and the luminous flux emitted from it is passed through a condenser lens 5 and an automatic horizontal error correction device 6. The beam is incident on a beam splitter 7 such as a dichroic prism, where it is reflected horizontally at right angles, and then passed through an optical system for a television camera consisting of a focusing lens 9 and an objective lens LO, which are moved forward and backward using a focusing knob 8, into a horizontal beam. Becomes F and fires, leveling rod 1
It is configured to irradiate the code scale 2 in a numeral shape.

Also, behind the dome blitter 7 is an objective lens 1.
0. An image pickup tube or solid-state image sensor f that scans the image in front of the objective lens 10 formed through the focusing lens 9 with a scanning line, photoelectrically converts the image, and outputs an image signal corresponding to the brightness of the image. The image signal is sent to a display 12 such as a dot φ matrix type liquid crystal display provided on the outer surface of the spirit level 3 and displayed as an image. The image converter 11 includes a position detection circuit that detects the light receiving position of the horizontal light flux F received by the code scale 2-H when the code scale 2 of the leveling rod 1 is projected and imaged thereon. A scale reading circuit is connected that reads the code scale 2 at the position in binary notation and outputs the read signal, and this read signal is sent to the display 12 to display the scale value converted to decimal. It is designed to be digitally displayed as an altitude value.

During leveling, the horizontal beam F emitted from the leveling rod 3 is irradiated onto the leveling rod L set up at the measuring point, the collimator of the leveling rod 3 is used to aim the leveling rod L, and the image is focused using the focusing knob while looking at the display I2. When the focus is adjusted and a clear image of the coat scale 2 is projected onto the display 12 via the image converter 11,
A position detection circuit connected to the image converter 11 automatically detects the receiving position of the horizontal beam F on the code scale 2, and at the same time, a scale reading circuit reads the code scale 2 at the light receiving position and calculates the numerical value as shown in FIG. It is displayed on the display 112 together with the image of the code scale 2 as shown in FIG.

Note that it is also possible to systematize the leveling by recording the reading signal manually inputted on the display 12 into a computer or the like using an output device and processing this data mechanically.

As described above, according to the present invention, the horizontal light beam emitted from the level is received by the code scale of the leveling staff, and the code scale at this light receiving position is projected onto the image converter provided on the level to detect the light receiving position. Since the altitude value is digitally displayed on the display by reading the code scale at the height, the scale value of the staff at the position where the horizontal light beam is received can be viewed as the altitude value displayed on the display and read clearly and accurately at one point. Because of this, it is possible to eliminate misreading and obtain accurate survey data, and by recording these values into a computer etc. using an output device, it is possible to eliminate errors, which mechanizes and systemizes leveling. becomes possible.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the implementation state of the method of this invention, FIG. 2 is a cross-sectional view showing an outline of the leveling instrument according to the invention, and FIG.
Reference numeral 81i7 is a front view showing a state in which a scale image and a scale value are displayed on the display device according to the present invention, and FIG. 4 is a block diagram of the electric circuit of the leveling instrument according to the present invention. L... Leveling rod, 2. Jar code scale, 3e. Leveling gauge, 4...
Luminous flux emitter, 5... Condenser lens, 6... Horizontal error automatic correction device, 7... Beam splitter - 18, φ focusing knob, 9... Focusing lens, 10... Objective lens, 1
1. Life image converter, 12. Display device, F. Horizontal luminous flux.

Claims (1)

[Scope of Claims] 1) A leveling rod provided with a photoelectrically convertible code scale is placed at a measuring point, and the code scale of this leveling staff is irradiated with a horizontal light beam emitted from a leveling instrument installed at the observation point, and the horizontal light beam is received. The code scale at the point is projected onto an image converter provided on the leveling instrument, and the light reception position M of the horizontal light flux on the code scale projected on the image converter is detected, and the code scale at that light reception position is read and the code scale is detected. A method for detecting a staff scale in leveling, characterized by inputting a reading signal to a display and displaying a scale value digitally. 2) A leveling rod equipped with a photoelectrically convertible code scale and a horizontal beam emitting optical system that emits a horizontal beam of laser or infrared light from the beam emitter horizontally forward are installed, and the beam projected by the television camera optical system is installed. An image converter that photoelectrically converts a projected image of a code scale and outputs an image signal, detects a light receiving position of the horizontal light beam on the code scale, reads the code scale at this light receiving position, and outputs the read signal. 1. A leveling rod scale detection device for leveling, characterized in that it comprises a leveling device provided with a display that receives the image signal and the scale reading signal and displays a code scale image and a scale value.