JPS62156408A - Apparatus for measuring properties of road surface - Google Patents
Apparatus for measuring properties of road surfaceInfo
- Publication number
- JPS62156408A JPS62156408A JP29357585A JP29357585A JPS62156408A JP S62156408 A JPS62156408 A JP S62156408A JP 29357585 A JP29357585 A JP 29357585A JP 29357585 A JP29357585 A JP 29357585A JP S62156408 A JPS62156408 A JP S62156408A
- Authority
- JP
- Japan
- Prior art keywords
- road surface
- laser beam
- vehicle
- vehicle speed
- speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Road Paving Machines (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
この発明はレーザスキャン法によって路面の状況を測定
する路面性状測定装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a road surface condition measuring device that measures the condition of a road surface using a laser scanning method.
従来の技術
従来、自走自在な測定車に搭載されたレーザ発振器で発
生させたレーザビームを路面に照射し、路面で反射され
るレーザビームを受光手段により受光して路面の性状を
測定する路面性状測定装置が特願昭５９−２３３９２３
号で出願されている。Conventional technology Conventionally, a road surface is measured by irradiating the road surface with a laser beam generated by a laser oscillator mounted on a self-propelled measuring vehicle, and receiving the laser beam reflected by the road surface using a light receiving means. Patent application No. 59-233923 for property measuring device
It has been filed under No.
上記出願の「路面性状測定装置」は、第７図に示すよう
にレーザ発振器ａで発生されたレーザビームｂを、モー
タｃＫより回転されるポリゴンミラーｄにより道路ｅの
幅方向へ屈折して、路面上をスキャンすると共に、路面
からの反射ビームを受光手段ｆで受光するように構成さ
れている。As shown in FIG. 7, the "road surface condition measuring device" of the above application refracts a laser beam b generated by a laser oscillator a in the width direction of a road e by a polygon mirror d rotated by a motor cK. It is configured to scan the road surface and to receive the reflected beam from the road surface by the light receiving means f.
また受光手段ｆで受光された信号から道路ｅの幅方向及
び進行方向のデータを等間隔にサンプリングしている。Furthermore, data in the width direction and traveling direction of the road e is sampled at equal intervals from the signal received by the light receiving means f.
発明が解決しようとする問題点
上記のような路面性状測定装置では、測定車の走行速度
が一定速度以内であれば、第８図（イ）Ｋ示すようにビ
ームスポットｂ′が道路の幅方向及び進行方向に連続し
【路面ｅをスキャンできることから、路面ｅ全体く亘っ
て性状の測定が可能となる。しかし車速か一定速度を越
えると、サンプリング時間ｔに対して車速が上まわるこ
とから、第８図（ロ）罠示すように車両の進行方向に対
して得られデータに歯抜は部分子が発生し、路面全体の
性状６（１ｊ定ができなくなる不具合があった。Problems to be Solved by the Invention In the above-mentioned road surface condition measuring device, if the traveling speed of the measuring vehicle is within a certain speed, the beam spot b' is aligned in the width direction of the road as shown in FIG. Since the road surface e can be scanned continuously in the traveling direction, it is possible to measure the properties of the entire road surface e. However, when the vehicle speed exceeds a certain speed, the vehicle speed exceeds the sampling time t, so a partial molecule occurs in the data obtained in the direction of travel of the vehicle, as shown in Figure 8 (b). However, there was a problem with the overall road surface properties that made it impossible to determine 6 (1j).
この発明は上記不具合を改善する目的でなされたもので
ある。This invention was made for the purpose of improving the above-mentioned problems.
問題点を解決するための手段及び作用
測定車１より路面へ向けてレーザビームを照射して路面
をスキャンし、路面からの反射光を路面性状データとし
て受光手段により収集するものにおいて、レーザビーム
の発生手段と、路面へ向けてスキャンされる手段の間に
、車速に応じて反射面の曲率が変化する反射手段を設け
ることにより、路面へ照射されるレーザビームのスポッ
ト径を測定車の進行方向に伸長させて、路面より収集さ
れる性状データに歯抜けが生じないようにした路面性状
測定装置。Means and Effects for Solving Problems In a system in which a laser beam is irradiated from the measuring vehicle 1 toward the road surface to scan the road surface, and the reflected light from the road surface is collected by a light receiving means as road surface condition data, the laser beam is By providing a reflecting means whose curvature of the reflecting surface changes depending on the vehicle speed between the generating means and the means that scans toward the road surface, the spot diameter of the laser beam irradiated onto the road surface can be measured in the direction of travel of the vehicle. A road surface condition measuring device that has been expanded to prevent gaps in the condition data collected from the road surface.
実施例 この発明の一実施例を図面を参照して詳述する。Example An embodiment of the present invention will be described in detail with reference to the drawings.
図において１は自走自在な測定車で、運転室１ａの上方
に、運転室１ａより前方へ突出するよう支持フレーム２
が設けられており、この支持フレーム２の基部に、レー
ザ発振器３が設けられている。上記レーザ発振器３で発
生されたレーザビーム４はハーフミラ−５を透過する際
一部が受光素子６へ同期信号として受光されると共に、
ハーフミラ−５を透過したレーザビーム４はミラー７に
より上記支持フレーム２の先端部に設けられたポリゴン
ミラー８方向へと屈折されるようになっている。上記ポ
リゴンミラー８は多数の平面鏡を有する多面鏡で、モー
タ９により一定の速度で回転されるようになつ工おり、
ポリゴンミラー８の各反射面で反射されたレーザビーム
４はスポット４ａとして測定車１前方の路面１０へ向け
て照射され、路ｒＭＪ＋０幅方向にスキャンするように
なっている。In the figure, reference numeral 1 denotes a self-propelled measuring vehicle, and a support frame 2 is provided above the driver's cab 1a so as to protrude forward from the driver's cab 1a.
is provided, and a laser oscillator 3 is provided at the base of this support frame 2. When the laser beam 4 generated by the laser oscillator 3 passes through the half mirror 5, a part of it is received by the light receiving element 6 as a synchronizing signal, and
The laser beam 4 transmitted through the half mirror 5 is refracted by a mirror 7 toward a polygon mirror 8 provided at the tip of the support frame 2. The polygon mirror 8 is a polygon mirror having a large number of plane mirrors, and is rotated at a constant speed by a motor 9.
The laser beam 4 reflected by each reflective surface of the polygon mirror 8 is irradiated as a spot 4a toward the road surface 10 in front of the measuring vehicle 1, and scans in the width direction of the road rMJ+0.
また測定車１の前側下部には、路面１０から反射される
レーザビーム４を受光する受光素子１１が車幅方向に設
けられていて、一定のサンプリング間隔で、反射光を路
面１０の性状データとして処理装置（図示せず）へ取込
むようになっている。Furthermore, a light receiving element 11 is provided at the lower front side of the measuring vehicle 1 in the vehicle width direction to receive the laser beam 4 reflected from the road surface 10, and the reflected light is used as property data of the road surface 10 at regular sampling intervals. The data is taken into a processing device (not shown).
一方ハーフミラー５を透過したレーザビーム４をポリゴ
ンミラー８側へ屈折するミラー７は磁歪素子により形成
されている。On the other hand, a mirror 7 that refracts the laser beam 4 transmitted through the half mirror 5 toward the polygon mirror 8 is formed of a magnetostrictive element.
上記磁歪素子は印加電圧大小によって反射面の曲率が変
化する性質をもつもので、電圧を印加しない状態では第
３図（イ）に示すように反射面７ａで反射されたレーザ
ビーム４のスポット４ａは円形となっているが、電圧を
印加すると第３図（ロ）に示すように反射面７ａの曲率
が変化して、反射ｌＩＤ７ａで反射されたレーザビーム
４のスボツ）４ａは長円となる。またこの長円の長さは
印加する電圧に比例して変化する。The magnetostrictive element has a property that the curvature of the reflecting surface changes depending on the magnitude of the applied voltage, and when no voltage is applied, the spot 4a of the laser beam 4 reflected on the reflecting surface 7a is shown in FIG. 3(A). has a circular shape, but when a voltage is applied, the curvature of the reflecting surface 7a changes as shown in FIG. . Further, the length of this ellipse changes in proportion to the applied voltage.
そしてこの発明の実施例では車速に応じて上記磁歪素子
の印加電圧を制御することにより、車速に比例したスポ
ット径を得ている。In the embodiment of the present invention, the spot diameter proportional to the vehicle speed is obtained by controlling the voltage applied to the magnetostrictive element according to the vehicle speed.
すなわち第４図に示すように、測定車１０車速は車輪１
ｂなどから測定し、これを速度／電圧変換器１５で電圧
に変換して、上記磁歪素子よりなるミラー７に印加して
いる。That is, as shown in Fig. 4, the vehicle speed of the measuring vehicle 10 is
b, etc., is converted into a voltage by a speed/voltage converter 15, and is applied to the mirror 7 made of the above-mentioned magnetostrictive element.
上記速度／［圧変換器！５は第５図（イ）に示すよう車
速μに比例した電圧Ｖを発生する。また磁歪素子よりな
るミラー７は第５図（ロ）に示すように印加電圧和比例
してスポット径が変化する。Above speed/[Pressure transducer! 5 generates a voltage V proportional to the vehicle speed μ as shown in FIG. 5(A). Further, the spot diameter of the mirror 7 made of a magnetostrictive element changes in proportion to the sum of applied voltages, as shown in FIG. 5(b).
その結果第５図（ハ）に示すように車速μに比例した電
圧な磁歪素子に印加することにより、第５図（ハ）に示
すように車速μに比例したスポット径が得られるように
なる。As a result, by applying a voltage proportional to the vehicle speed μ to the magnetostrictive element as shown in FIG. 5(C), a spot diameter proportional to the vehicle speed μ can be obtained as shown in FIG. 5(C). .
次に測定方法について説明すると、測定車１が低速で走
行しているときには、磁歪素子よりなるミラー７に印加
される電圧も低いため、ポリゴンミラー８により路面へ
向けて照射されるレーザビーム４のスポット４ａは第６
図Ｇ）に示すように連続しながら測定車１前方の路面１
０をスキャンし、路面１０からの反射光を受光素子１１
が路面１０の性状データとして受光し、処理装置へ取込
む。Next, to explain the measurement method, when the measuring vehicle 1 is running at low speed, the voltage applied to the mirror 7 made of a magnetostrictive element is also low, so the laser beam 4 irradiated by the polygon mirror 8 toward the road surface is Spot 4a is the 6th
As shown in Figure G), the road surface 1 in front of the measuring vehicle 1 is
0, and the light receiving element 11 receives the reflected light from the road surface 10.
receives the light as property data of the road surface 10 and inputs it into a processing device.
一方測定車１０車速か高速になると、これに比例して磁
歪素子に印加される電圧も上昇して、ミラー７０反射面
７ａの曲率が小さくなるため、ポリゴンミラー８より路
面１０へ照射されるレーザビーム４のスポット４ａも、
第６図（ロ）に示すように車速に比例して長円の長さを
増す。On the other hand, when the measuring vehicle speed increases to 10 or higher, the voltage applied to the magnetostrictive element increases in proportion to this, and the curvature of the mirror 70 reflecting surface 7a becomes smaller, so that the laser beam irradiated from the polygon mirror 8 onto the road surface 10 Spot 4a of beam 4 is also
As shown in FIG. 6 (b), the length of the oval increases in proportion to the vehicle speed.
その結果車速が高速になっても従来のように歯抜けを発
生することなく、路面！０の性状をデータとして受光素
子ＩＩより処理装置へと取込むことができるようになる
。As a result, even when the vehicle speed is high, there is no tooth loss like in the past, and the road surface is smooth! The properties of 0 can now be taken in as data from the light receiving element II to the processing device.
発明の効果
この発明は以上詳述したように、車速に応じて反射面の
曲率な変化する磁歪素子よりなる反射手段なレーザ発振
手段とレーザビーム走査手段の間に設けたことから、測
定車が高速で走行しても、歯抜けを生じることなく路面
の性状をデータとして収集することができる。これによ
って測定車の速度圧関係なく路面の性状が高精度で測定
できるようになる。また高速による測定が可能なため、
測定時間の短縮が図れると共に、高速道路などでの測定
に際しても、交通を妨げることなく測定が可能である。Effects of the Invention As described in detail above, this invention is provided between the laser oscillation means, which is a reflection means made of a magnetostrictive element whose curvature of the reflection surface changes depending on the vehicle speed, and the laser beam scanning means, so that the measuring vehicle can Even when driving at high speeds, it is possible to collect data on road surface properties without missing any information. This makes it possible to measure road surface properties with high precision regardless of the speed and pressure of the measuring vehicle. Also, since high-speed measurement is possible,
Not only can the measurement time be shortened, but also measurements can be taken on expressways without interfering with traffic.
図面はこの発明の一実施例を示し、第１図は測定車の斜
視図、第２図はこの装置の概略構成図、第３図（イ）お
よび（ロ）は磁歪素子の説明図、第４図は磁歪素子の制
御系を示す説明図、第５図（イ）ないしくハ）は同制御
系の性能を示す線図、第６図（イ）、（ロ）は作用説明
図、第７図および第８図（イ）、（ロ）は従来例の説明
図である。
１は測定車、４はレーザビーム、７ａは反射面、ＩＯは
路面。The drawings show one embodiment of the present invention, in which Fig. 1 is a perspective view of a measuring vehicle, Fig. 2 is a schematic configuration diagram of this device, Figs. 3 (a) and (b) are explanatory diagrams of the magnetostrictive element, Fig. 4 is an explanatory diagram showing the control system of the magnetostrictive element, Fig. 5 (a) or c) is a diagram showing the performance of the control system, Figs. 6 (a) and (b) are action explanatory diagrams, and Figs. FIG. 7 and FIGS. 8(a) and 8(b) are explanatory diagrams of conventional examples. 1 is a measurement vehicle, 4 is a laser beam, 7a is a reflective surface, and IO is a road surface.
Claims (1)
て路面１０をスキヤンし、路面１０からの反射光を路面
１０の性状データとして受光手段により収集するものに
おいて、レーザビーム４の発生手段と、路面１０へ向け
てスキヤンさせる手段の間に、車速に応じて反射面７ａ
の曲率が変化する反射手段を設けてなる路面性状測定装
置。The laser beam 4 is irradiated from the measuring vehicle 1 toward the road surface 10 to scan the road surface 10, and the reflected light from the road surface 10 is collected by the light receiving means as property data of the road surface 10. , between the means for scanning toward the road surface 10, a reflective surface 7a depending on the vehicle speed.
A road surface condition measuring device comprising a reflecting means whose curvature changes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29357585A JPH0660819B2 (en) | 1985-12-28 | 1985-12-28 | Road condition measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29357585A JPH0660819B2 (en) | 1985-12-28 | 1985-12-28 | Road condition measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62156408A true JPS62156408A (en) | 1987-07-11 |
| JPH0660819B2 JPH0660819B2 (en) | 1994-08-10 |
Family
ID=17796507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29357585A Expired - Fee Related JPH0660819B2 (en) | 1985-12-28 | 1985-12-28 | Road condition measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0660819B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016121688A1 (en) * | 2015-01-29 | 2016-08-04 | 日立建機株式会社 | Obstacle detection device for transport vehicle |
-
1985
- 1985-12-28 JP JP29357585A patent/JPH0660819B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016121688A1 (en) * | 2015-01-29 | 2016-08-04 | 日立建機株式会社 | Obstacle detection device for transport vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0660819B2 (en) | 1994-08-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |