JPS63100319A - Road surface measuring instrument - Google Patents

Abstract

PURPOSE:To measure the unevenness state of a road surface over a wide range with high accuracy by a relatively small-sized constitution by adding the output of a memory to an actual measured value and making corrections. CONSTITUTION:A laser light transmission and reception part 51 is mounted on a sensor support mechanism 10 equipped with a mobile frame 50 and a main body frame 52. The tip part of the frame 50 of the support mechanism 10 droops by its own weight and the light transmission and reception part 51 droops toward its tip. Then, the unevenness information from the road surface which is detected by the light transmission/reception part 51 is sent to an adder 7 and added to a corresponding correcting value outputted by a memory mechanism 6, and the resulting information is sent to a data processing circuit 8 to correct a measured value by the measurement position, so that the result is displayed and recorded at a display part 20.

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 A along the road surface E,
A configuration is adopted in which a laser beam transmitting/receiving section 51 is installed on a moving frame 50 that moves back and forth in the direction B, and the laser beam transmitting/receiving section 51 is moved back and forth on the moving frame 50 in order to further expand the measurement range. There is. In this case, the moving frame 50 includes guide rollers Sl, S2 . S3.・
....

S, and is configured to reciprocate from the left side of the figure (the position indicated by the solid line) to the position indicated by the two-dot chain line on the right side of the figure. Therefore, it is possible to effectively measure a range that is more than twice the length of the main body frame 52.

(Problems to be Solved by the Invention) However, in such a conventional example, depending on the position of the movable frame 50, the movable frame 50 becomes in a state equivalent to a cantilever beam, so that deflection due to its own weight occurs, and the laser beam A situation has arisen in which it is difficult to maintain the same height of the laser beam transmitting/receiving section 51 over the entire moving distance of the transmitting/receiving section 51.

On the other hand, in order to improve this inconvenience, the main body frame 52 should be formed to be robust, and the guide roller S1. S
A possible method is to provide a large number of z, Ss, . . . , Ss, etc.

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 purpose of this invention is to provide a road surface measuring device that can measure the road surface.

[Means for Solving the Problems] Therefore, the present invention provides a sensor unit that detects the height and unevenness of the road surface, and data processing that processes and displays information on the unevenness of the road surface detected by the sensor unit. A circuit and a sensor support mechanism for reciprocating the sensor section along the road surface are provided, and the amount of droop of the sensor section is measured over the entire area where the sensor section reciprocates at the signal input stage of the data processing circuit. The above objective is achieved by providing a memory mechanism for storing the measured values and an adder for adding and correcting the output from the memory mechanism to the actual measured value at the corresponding position. .

[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 includes a sensor support mechanism 1 that includes a moving frame 50 and a main body frame 52.
Equipped with 0. 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. The main body frame 52 includes a motor 1 that drives the moving frame 50 and the laser beam transmitting/receiving section 51.
is equipped with. 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 the counter 4 outputs a predetermined timing signal to an excitation oscillation circuit 5 and a memory mechanism 6.

The correction table of the memory mechanism 6 stores correction data as shown in FIG. This correction data d0. d
, d, ..., d,1 divides the entire movement area of the laser beam transmitting/receiving section 51 into n measurement points as shown in FIG. The amount is measured and memorized.

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 as it approaches 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. Furthermore, since even the slightest change in the standard height H is not allowed during measurement, a surface plate E is used. In addition, in this FIG. 2, ho, h,, h2, . . . , h9 are the distances ( height). As shown in FIG. 3, the correction table of the memory mechanism 6 mentioned above includes the height H in the ideal state and the actual measured values h0, h,
, h2. . . , the difference from h7 indicates the measurement point x=0. x=1. x=2. . . . are stored corresponding to x=n.

The excitation circuit 5, which outputs a predetermined excitation signal to the laser beam transmitting/receiving section 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 transmitting/receiving section 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 section 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.

This indicates the measurement position x = 0.1, 2°...
, n and the total correction value d=do, d1+ for the measured value
d! + . 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. .

〔Effect of the invention〕

Since the present invention is configured and functions as described above, it is possible to obtain measurement data that effectively corrects height fluctuations caused by the sensor support mechanism, thereby significantly reducing measurement errors. This eliminates the need for large-scale equipment, 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 the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing a method for specifying the correction value stored in the memory mechanism of FIG. 1, and FIG. 3 is a block diagram showing an embodiment of the present invention. FIG. 4 is an explanatory diagram of a memory mechanism showing the storage status of correction values, and FIG. 4 is an explanatory diagram showing a conventional example. 6...Memory mechanism, 7...Adder, 8
. . . Data processing circuit, 10 . . . Sensor support mechanism, 51 . . . Laser light transmission/reception unit as a sensor unit. Patent applicant Tokyo Co., Ltd. Meter Figure 1

Claims (1)

[Claims] (1) A sensor section that detects the height and unevenness of the road surface, a data processing circuit that processes and displays information on the road surface unevenness detected by the sensor section, and a reciprocating circuit that moves the sensor section along the road surface. A sensor support mechanism for moving the sensor is provided at the signal input stage of the data processing circuit, a memory mechanism for measuring and storing the amount of drooping of the sensor over the entire area where the sensor moves back and forth, and an output from this memory mechanism. What is claimed is: 1. A road surface measurement device comprising: an adder for adding and correcting the actual measured value at a corresponding position.