JPH0419488B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a road surface measuring device, and particularly to a road surface measuring device that includes a sensor section that moves along a measurement surface and a sensor support mechanism that supports the sensor section. Regarding measuring devices.

[Conventional technology]

FIG. 4 shows an example of a road surface measurement device that measures road surface irregularities using laser light. This device is equipped with a laser beam transmitter/receiver 51 on a movable frame 50 that reciprocates in directions A and B along a road surface E, and in order to further expand the measurement range, the laser beam transmitter/receiver 51 is mounted on the movable frame 50. A configuration is adopted in which the robot is moved back and forth. In this case, the moving frame 50 is guided by each of the guide rollers S ₁ , S ₂ , S ₃ , ..., S ₅ from the left side of the figure (solid line position) to the right side of the figure as indicated by the chain double-dashed line. It is configured to move back and forth to the desired position. Therefore, it is possible to effectively measure a range that is more than twice the length L of the main body frame 52.

[Problem that the invention seeks to solve]

However, in such a conventional example, depending on the position of the moving frame 50,
0 is in a state equivalent to a cantilever beam, deflection due to its own weight occurs, and the laser beam transmitting/receiving section 51 is deflected over the entire moving distance of the laser beam transmitting/receiving section 51.
A situation has arisen in which it is difficult to maintain the same height.

On the other hand, in order to improve this inconvenience, a method can be considered in which the main body frame 52 is formed to be robust and a large number of guide rollers S ₁ , S ₂ , S ₃ , . . . , S ₅ are provided.

However, in this case, the entire apparatus becomes large-scale, and not only does it take a lot of time and effort to transport it, but it also takes time and effort to install it at the measurement location, resulting in a lack of speed in measurement work.

[Purpose of the invention]

The present invention improves the disadvantages of the conventional example, and although it is relatively small, it can handle a wide range of road surface irregularities with high precision without being adversely affected by the drooping of the extending end of the moving frame. The objective is to provide a road surface measuring device that can measure road surface.

[Means for solving problems]

Therefore, in the present invention, a sensor unit that detects the height and unevenness of the road surface, a data processing circuit that processes signals and displays the upper part of the road surface unevenness detected by the sensor unit, and a sensor unit that moves along the road surface. A sensor support mechanism for reciprocating movement is provided. Also,
Between the data processing circuit and the sensor section, there is a memory mechanism that measures and stores in advance the amount of droop of the sensor section over the entire area in which the sensor section reciprocates, and an output from this memory mechanism that corresponds to this. An arithmetic correction circuit that performs correction based on the actual measured value at the position is provided. The sensor support mechanism is equipped with a reference position output sensor that outputs a predetermined timing signal for specifying the measurement start position by the sensor unit to the data processing circuit and the sensor support mechanism. This aims to achieve the above-mentioned purpose.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Here, the same reference numerals are used for the same constituent members as those in the conventional example described above.

In FIG. 1, a laser beam transmitter/receiver 51 is installed in a sensor support mechanism 10 that includes a moving frame 50 and a main body frame 52. As shown in FIG. To explain this specifically, the laser beam transmitting/receiving section 51 as a sensor section is reciprocally obstructed by the movable frame 50 as in the case of FIG. 4 described above.
The movable frame 50 is obstructed by the main body frame 52 so as to be able to freely reciprocate. In the main body frame 52,
A motor 1 is provided to drive the moving frame 50 and the laser beam transmitting/receiving section 51. This motor 1 is equipped with an encoder 3 that outputs a timing signal for regulating the timing of the operation of the entire signal processing system.

The output of the encoder 3 is counted by a counter 4 and sent from the counter 4 to an excitation oscillation circuit 5.
And a predetermined timing signal is output to the memory mechanism 6.

The correction table of the memory mechanism 6 stores correction data as shown in FIG. This correction data d ₀ , d ₁ , d ₂ , ..., d _o divides the entire moving area of the laser beam transmitting/receiving section 51 into n measurement points as shown in FIG. The amount of droop of the portion 51 is measured and stored.

To explain this in more detail, the sensor support mechanism 10 in this embodiment has the characteristic of a cantilever beam at both ends of the moving frame 50 in the moving direction, as shown in FIG.
The distal end of the laser beam 51 droops somewhat due to its own weight, and accordingly, the laser beam transmitting/receiving section 51 gradually droops toward the distal end. Curve A in FIG. 2 shows an example of this situation. When the laser beam transmitter/receiver 51 is located at the center of the entire movement area, the amount of droop is almost zero, and at both ends, the amount of droop is the maximum. is recorded. In addition, a surface plate _Es is used because even the slightest change in the standard uniform height H is not allowed during measurement. Also, in this Figure 2, h ₀ , h ₁ , h ₂ ,
..., _ho indicates the distance (height) between the laser beam transmitter/receiver 51 and the surface plate _Es , which is actually measured by the laser beam transmitter/receiver 51. As shown in FIG. 3, the correction table of the memory mechanism 6 mentioned above contains the height H in the ideal state and the actual measured values h ₀ , h ₁ , h ₂ ,
..., the difference from _ho indicates the measurement point x = 0,
They are stored in correspondence to x=1, x=2, . . . , x=n.

The excitation circuit 5, which outputs a predetermined excitation signal to the laser beam transmitter/receiver 51, is energized by the counter output and outputs a predetermined pulse signal for laser emission, thereby energizing the oscillation section of the laser beam transmitter/receiver 51. Further, the information on unevenness from the road surface detected by the laser beam transmitter/receiver 51 is immediately sent to the adder 7, summed with the corresponding correction value output from the memory mechanism 6 at the same timing, and sent to the data processing circuit 8. The signal is subjected to predetermined signal processing and displayed on the display unit 20 or recorded.

Further, the end of the main body frame 52 is equipped with a reference position specifying sensor 9 that outputs a position signal for determining the measurement start position. The output of the reference position specifying sensor 9 is output to the locations that require it, that is, the memory mechanism 6 and the data processing circuit 8.

With this, x = 0, 1, which indicates the measurement position,
2,...,n and the total correction value d=d ₀ for the measured value,
Correspondence with d ₁ , d ₂ , ..., d _o is adopted, so that road surface unevenness measurement data can be obtained based on reference values in an ideal state. The other configurations are the same as those shown in FIG. 4 described above.

In addition, in the above embodiment, the case where the measurement data is corrected sequentially during measurement in real time is illustrated, but the measurement data may be recorded and corrected and signal processed after the measurement is completed. .

[Effects of the Invention] Since the present invention is configured and functions as described above,
According to this, with respect to height fluctuations caused by the sensor support mechanism that supports the sensor unit for road surface measurement,
It is possible to obtain measurement data that effectively corrects this, and therefore it is possible to significantly reduce measurement errors and increase the reliability of the entire measuring device.
Large-scale equipment for this purpose is unnecessary, and in this respect, it is possible to provide a road surface measurement device that is relatively compact and has good workability.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention;
2 is an explanatory diagram showing a method for specifying the correction value stored in the memory mechanism of FIG. 1, FIG. 3 is an explanatory diagram of the memory mechanism showing the storage status of the correction value characterized in FIG. The figure is an explanatory diagram showing a conventional example. 6...Memory mechanism, 7...Adder, 8...Data processing circuit, 10...Sensor support mechanism, 51...Laser light transmitting/receiving unit as a sensor unit.

Claims (1)

[Scope of Claims] 1. A sensor unit that detects the height and unevenness of the road surface, a data processing circuit that processes signals and displays the upper part of the road surface unevenness detected by the sensor unit, and a sensor unit that detects the height and unevenness of the road surface. a sensor support mechanism that moves back and forth along the data processing circuit and the sensor section;
A memory mechanism that measures and stores the amount of droop of the sensor unit in advance over the entire area in which the sensor unit moves back and forth, and a calculation that corrects the output from this memory mechanism based on the actual measured value at the corresponding position. a correction circuit, and the sensor support mechanism is equipped with a reference position output sensor that outputs a predetermined timing signal for specifying a measurement start position by the sensor section to the data processing circuit and the sensor support mechanism. Characteristic road surface measuring device.