JPH0467885B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a measuring device that optically measures the amount of displacement of an object.

[Conventional technology]

Conventionally, in the displacement measurement method used when testing the strength of power transmission line towers, a scale is attached to the tower at the position where the measurement is to be made, and a measurer records the displacement while monitoring it using a transit.

[Problem to be solved by the invention]

In these conventional displacement measurement methods, measurements had to be performed in stages during loading, which not only made it impossible to record continuously due to continuous loading, but also made the measurement workability extremely poor.

This invention solves the problems of the prior art as described above, and provides automatic optical displacement measurement that can measure the displacement of an object to be measured non-contact, accurately, continuously, and without operator intervention. The purpose is to provide equipment.

[Means to solve the problem]

The optical displacement automatic measurement device of the present invention sets a measurement target point on the surface of an object to be measured for displacement, which is made up of two fluorescent lamps arranged at a predetermined interval on a black board, and images this object. , an imaging device that outputs an image signal including the measurement target point, an arithmetic device that inputs the image signal from the imaging device and calculates the amount of displacement of the measurement target point coordinates of the image signal, and The present invention is characterized by comprising a display section for inputting and displaying the amount of displacement.

〔Example〕

The present invention will be described below based on illustrated embodiments.

FIG. 1 shows a steel tower 1 as an embodiment of the present invention.
This figure shows a case where target points 2 are provided at a plurality of positions, and a plurality of CCD cameras 5 corresponding to the number of target points 2 are used as an imaging device.

This target point 2 is the front view of the steel tower 1 in Figure 2a,
As shown in the partially enlarged view of FIG. 2b, two fluorescent lamps 4, 4 are arranged on a black board 3 at a predetermined interval.

The CCD camera 5 is composed of a CCD element 7 and an optical lens 6, as shown in FIG. be done. The arithmetic device 9 includes a display 10 for displaying processing results and a keyboard 11 for inputting operations.

The digital image signal of the target obtained by the CCD camera 5 is as shown in FIG. 4a and b.
It is expressed as a pixel row showing distortion in the vertical and horizontal directions due to the constituent pixels of the CCD element 7.

FIG. 5 shows the block configuration of FIG. 3 in more detail, and the controller 8 of the CCD camera 5 includes a sensor control section, a drive frequency setting section, a comparator, a reference voltage setting section, and a data processing section. configured. Further, the arithmetic device 9 includes an I/F with the controller 8 and a CPU.

Here, as shown in Fig. 6, the CCD camera 5
scans a specific portion (indicated by a one-dot chain line) that intersects the two fluorescent lamps 4, 4 at the target point 2, and the output is as shown in FIG. As shown in the output example in Fig. 7, the black board 3 part that is the background of target point 2 appears as a low-level random noise-like brightness difference, and if processed at an appropriate threshold level, the fluorescent light The number of pixels between lights 4 and 4 is determined.

From these processes, for example, the coordinate L ₁ from the left end of one frame image to one fluorescent lamp 4, the coordinate L ₂ between the two fluorescent lamps 4, 4, and the coordinate L of the midpoint between the fluorescent lamps 4, 4. ₃ is obtained, and when the target point 2 is displaced as shown by the dashed line, the displacement amount L _L is calculated by the same process.

These values can be displayed on the display 10, as illustrated in FIG. 8, and printed if necessary.

In this way, the distortion (displacement amount) captured by the CCD camera 5 is recorded in the memory (not shown) in the calculation device 9 for each measurement point, as shown in FIG. 9, and can also be printed out. .

When measuring with the device configured as described above, first, a target point is set at a predetermined location on the object to be measured, such as the steel tower 1, by placing two fluorescent lamps 4, 4 at a predetermined interval on a black board 3. 2, and a number of CCD cameras 5 corresponding to the number of target points 2 are set.

The digital image signal captured by the CCD camera 5 is inputted from the controller according to the flowchart shown in FIG. 9, and the displacement is calculated and the waveform is displayed (steps . . . ).

This is done for all channels (step), and if the next data after a unit time is required (step), the timing is adjusted and the controller is instructed to output (step).

Process the data for the required time, finish (step), save the data (step),
Analyze spectrum, orbit, numerical output, etc. for all channels (steps...
,).

In this way, based on the measurement program set in the arithmetic unit 9, the controller 8 measures the CCD at the target point 2, which is made up of two fluorescent lamps 4, 4 arranged at a predetermined interval on the black board 3. By operating the camera 5, it is possible to continuously measure the displacement of the object throughout the day and night without human intervention.

〔Effect of the invention〕

By using the automatic optical displacement measurement device of the present invention, the displacement of the object to be measured can be measured continuously, non-contact, and with high accuracy without operator intervention.

In addition, in this invention, by arranging two fluorescent lamps at a predetermined interval on a black board as the measurement target point, the number of pixels between the fluorescent lamps can be determined reliably, and the amount of displacement can be measured reliably. can be done.

That is, by setting the background of the target point to black and using a fluorescent lamp, a large difference in brightness occurs between day and night, and reliable measurement can be performed. Furthermore, since the distance between the two fluorescent lamps is known, the amount of displacement of the object can be directly calculated according to the number of pixels. Furthermore, since the brightness of the entire target point is higher than when the target point is configured with a single fluorescent lamp, the target point can be easily confirmed even if the distance from the imaging device to the target point is long. In addition, the number of pixels for the fluorescent lights that make up the target point changes depending on the measurement time, weather, measurement direction, etc., but by using the midpoint of the two fluorescent lights as a reference, measurement errors can be eliminated. can do.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the positional relationship between the object to be measured and the imaging device in an embodiment of the present invention, FIGS. 2 a and b are an overall view and partially enlarged view showing the measurement target point mounting position, and FIG. A block diagram of the device, Figures 4a and 4b are output pixel examples, Figure 5 is a detailed block configuration diagram of Figure 3, Figure 6 is a schematic diagram showing the imaging position of the CCD camera, and Figure 7 is a diagram of the brightness. Signal output example diagram,
FIG. 8 is a diagram showing an example of data display, FIG. 9 is a diagram of the amount of displacement calculated over time, and FIG. 10 is a flowchart of the processing process. 1... Steel tower, 2... Target point, 3... Black board, 4... Fluorescent light, 5... CCD camera, 6...
Optical lens, 7... CCD camera element, 8... Controller, 9... Arithmetic unit, 10... Display, 11... Keyboard.

Claims (1)

[Claims] 1. A measurement target point formed by two fluorescent lamps arranged at a predetermined interval on a black board provided on the surface of the object to be measured, and an image of the object to be measured, an imaging device that outputs an image signal including the measurement target point; an arithmetic device that receives the image signal from the imaging device and calculates a displacement amount of the measurement target point coordinates in the image signal; An optical displacement automatic measuring device comprising a display section for inputting and displaying the determined displacement amount.