JPS5973771A - Speed measuring system - Google Patents
Speed measuring systemInfo
- Publication number
- JPS5973771A JPS5973771A JP18428382A JP18428382A JPS5973771A JP S5973771 A JPS5973771 A JP S5973771A JP 18428382 A JP18428382 A JP 18428382A JP 18428382 A JP18428382 A JP 18428382A JP S5973771 A JPS5973771 A JP S5973771A
- Authority
- JP
- Japan
- Prior art keywords
- light
- time
- measured
- speed
- light shielding
- 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.)
- Pending
Links
- 238000005259 measurement Methods 0.000 claims abstract description 32
- 230000004907 flux Effects 0.000 claims abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/64—Devices characterised by the determination of the time taken to traverse a fixed distance
- G01P3/68—Devices characterised by the determination of the time taken to traverse a fixed distance using optical means, i.e. using infrared, visible, or ultraviolet light
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は車輌環の走行速度を測定するシステムに関する
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system for measuring the running speed of a vehicle wheel.
従来より車輌等の走行速度を精度よく測定するのに、光
電計測法がしばしば用いられている。光電計測法は光源
と受光部の対を少くとも二組所定の間隔をおいて配置し
、測定対象である車輌が光源の前をよぎり、受光部への
光線を遮断する時刻を電気的に検出し二つの光源をよぎ
る時間間隔から速度を算出するものである。この方法は
広い速度範囲を精度よく測定できる利点を持つがいある
特定の車輌を他と識別できないので、特定の車輌に限っ
て速度測定を行なう場合に不便である。この点を改善す
るためにプラスチックなどで作られた小さなコーナーキ
ューブを多数配列した回帰性反射板を測定対象車輌に取
り付けることが行われている。回帰性反射板は光の入射
方向に光を反射する特性を有するので、光源の近くに受
光部を設は反射光を検出する。この方法は特定車輌の識
別は可能であるが、受光部からの出力信号の立ち上りは
光源より反射される光ビームの断面の光分布の立ち上り
によっ°Ｃ左右され急峻な立ち上り特性を得にくいこと
や、また光ビームの光軸が温度変化などで変動すること
が直接測定誤差の原因になるなど測定精度の面では不利
な点が多い。2. Description of the Related Art Conventionally, photoelectric measurement methods have often been used to accurately measure the traveling speed of vehicles and the like. In the photoelectric measurement method, at least two pairs of a light source and a light receiving part are arranged at a predetermined distance, and the time when the vehicle being measured passes in front of the light source and blocks the light beam to the light receiving part is electrically detected. The speed is calculated from the time interval between two light sources. Although this method has the advantage of being able to accurately measure a wide speed range, it is inconvenient when measuring the speed of only a specific vehicle because it cannot distinguish one specific vehicle from another. In order to improve this problem, a retroreflector plate consisting of a large number of small corner cubes made of plastic or the like is attached to the vehicle being measured. Since the recursive reflector has a characteristic of reflecting light in the direction in which the light is incident, a light receiving section is provided near the light source to detect the reflected light. Although this method makes it possible to identify a specific vehicle, the rise of the output signal from the light receiving unit is influenced by the rise of the light distribution in the cross section of the light beam reflected from the light source, making it difficult to obtain a steep rise characteristic. Furthermore, there are many disadvantages in terms of measurement accuracy, such as fluctuations in the optical axis of the light beam due to temperature changes, etc., which directly causes measurement errors.
本発明の目的は測定対象をそれ以外から的確に識別し、
しかも高精度の測定を可能とする速度測定システムを提
供することにある。The purpose of the present invention is to accurately identify a measurement target from other objects,
Moreover, it is an object of the present invention to provide a speed measurement system that enables highly accurate measurement.
本発明によれば、二個所以上の所定の位置に対して光線
束を放射するように設けられた光源部と、該光源部から
放射され前記所定の位置を通過した光線束を受光し電気
信号に変換する受光部と、該受光部に前記光源部から入
射する光線束を測定対象が遮光する時刻を前記電気信号
から検出し前記測定対象の速度を算出する信号処理部と
を備えた速度計測システムにおいて、前記測定対象に所
定の幅の遮光部と所定の幅の透光部とを交互に配列した
遮光器を備え、前記測定対象とそれ以外の物件とを識別
することを％徴とする速度計測システムが得られる。According to the present invention, there is provided a light source section that is provided to emit a beam of light to two or more predetermined positions, and an electrical signal that is received by the light beam that is emitted from the light source section and passes through the predetermined positions. and a signal processing unit that detects, from the electrical signal, a time at which the measurement object blocks the light beam incident on the light reception section from the light source section, and calculates the speed of the measurement object. In the system, the measuring object is provided with a light shield in which a light-blocking part of a predetermined width and a light-transmitting part of a predetermined width are arranged alternately, and the measuring object is distinguished from other objects. A speed measurement system is obtained.
以下本発明について図面を参照して説明する。The present invention will be explained below with reference to the drawings.
第１図を参照すれば本発明の実施例は予め定められた２
地点１０および２０に光線束１３および１４を放射する
光源部１１および１２と、受光部１５および１６とを備
えている。光源部１３および１４は受光部１５および１
６において十分な強度を持つ光線束を放射する必要があ
り、白熱ランプとレンズや反射鏡などの光学系を組み合
わせたもの、あるいはそれ自体細いビーム状の光線束を
放射するガスレーザなどを使うことができる。受光部１
５および１６はレンズにより来光しその焦点面にピンホ
ールやスリットを置き地点１０および２０を通過した光
のみをフォトダイオードやフォトトランジスタに導びき
光電変換を行なうものが好ましい。このような構成を取
ることにより、光源１１および１２の光軸が温度変化な
どにより移動しても測定地点は移動することがない。ま
た光線束の断面の光強度分布は測定精度にほとんど影響
しない。測定対象となる車輌１８にはこの車輌を他の測
定対象外の車輌と区別するために遮光器１９を設けてあ
り、その遮光器１９が光線束１３および１４を横切る時
の光の時系列パターンを受光部１５および１６で光電変
換して信号処理部で認識し、地点１ｏおよび２ｏの間の
通過時間を計測し、速度を算出するのである。Referring to FIG.
It includes light source sections 11 and 12 that emit light beams 13 and 14 to points 10 and 20, and light receiving sections 15 and 16. The light source sections 13 and 14 are connected to the light receiving sections 15 and 1.
6, it is necessary to emit a beam of light with sufficient intensity, and it is possible to use a combination of an incandescent lamp and an optical system such as a lens or a reflector, or a gas laser that itself emits a narrow beam of light. can. Light receiving part 1
5 and 16 are preferably lenses in which light is received by a lens, a pinhole or slit is placed in the focal plane, and only the light that has passed through points 10 and 20 is guided to a photodiode or phototransistor for photoelectric conversion. By adopting such a configuration, the measurement point will not move even if the optical axes of the light sources 11 and 12 move due to temperature changes or the like. Furthermore, the light intensity distribution in the cross section of the beam bundle has almost no effect on measurement accuracy. The vehicle 18 to be measured is provided with a light shield 19 to distinguish it from other vehicles not to be measured, and the time-series pattern of light when the light shield 19 crosses the beams 13 and 14 is shown. is photoelectrically converted by the light receiving units 15 and 16 and recognized by the signal processing unit, the passing time between points 1o and 2o is measured, and the speed is calculated.
第２図は本発明に用いられる遮光器１９の一実施例であ
る。この実施例は金属など金材料とし、ボルトとナツト
で測定対象に取り付けるための通し穴２７および２８を
設けた取シ付は部２６を備えた板状のものであ、す、光
線をさえぎる３個の遮光部２１．２２および２３と光線
を透過する２個の透光部２４および２５とが交互に配置
され°Ｃいる。遮光部と透過部の数および幅は測定対象
をそれ以外のものと区別するように、測定対象以外の物
体が光線束を横切る場合の光の時系列パターンと明確な
差異を生ずるように選ぶべきである。FIG. 2 shows an embodiment of the light shield 19 used in the present invention. In this embodiment, a gold material such as metal is used, and the mounting plate has through holes 27 and 28 for attaching to the object to be measured with bolts and nuts. Two light-shielding parts 21, 22 and 23 and two light-transmitting parts 24 and 25 that transmit light are arranged alternately. The number and width of the light-blocking parts and transmitting parts should be selected so as to distinguish the measurement target from other objects, and to create a clear difference from the time-series pattern of light when an object other than the measurement target crosses the light beam. It is.
第３図は第２図の遮光器を用いた場合の受光器の光電変
換回路の出カ篭流波形３１を示す。遮光器や何らかの物
体が光をさえぎらない期間３３゜３５．３７および３９
では出力は高く、遮光器の遮光部で光がさえぎられる期
間３４．３６および３８では出力唸低くなっている。FIG. 3 shows the output waveform 31 of the photoelectric conversion circuit of the light receiver when the light shield shown in FIG. 2 is used. 33° 35.37 and 39 during which a light shield or some other object does not block the light
The output is high, and the output is low during the periods 34, 36 and 38 when the light is blocked by the light shielding part of the light shield.
第４図は本発明の受光部と信号処理部の回路構成の一例
を示す。ｉｘｉ換回路４１からは前第３図で説明した通
りの出力３１がでる。比較回路４２では前回に示した所
定の基準レベル３２と比較して出力３１０「茜」［−低
」の判定を行なう。時間計測回路（Ａ）４３では出力３
１が最初「都」から「低」に変る時点で計測を始め、次
に「高」から「低」に変る時点で計測した時間Ｔ１を判
別回路４４に送り、次の時間計測を開始する。出力３１
が次に「商」から「低」に変る時点で計測した時間Ｔ２
を判別回路４４に送る。判別−路ではｒｌ＋鳳とＴ２が
−・致すれば遮光器１０が通過したと判別し時間計測回
路（Ｂ）に信号を出し時間計測を開始し、一致しない時
は時間ｌ１１１には遮光器１ｏ以外のものが通過したと
判別し、時間１゛２を時間ＴＩと見なして時間計側回路
（Ａ）４３の計測を新たに開始する。時間計測回路（Ｂ
） ４５が計測を開始した場合には、もう一つの受光
部に関する光電変換回路４１′、比較回路４２′１時間
計測回路（Ａ）４３′および判別回路４４′から遮光器
１ｏの通過信号が時間計測回路（Ｂ）４５に与えられた
時に計測した時間により速度演算回路４６により速度が
算出される。このようにして測定対象を他と区別してそ
の速度を計測することができる。FIG. 4 shows an example of the circuit configuration of the light receiving section and the signal processing section of the present invention. The ixi conversion circuit 41 outputs the output 31 as explained in FIG. 3 above. The comparison circuit 42 compares it with the predetermined reference level 32 shown last time to determine whether the output 310 is "red" [-low]. Output 3 in time measurement circuit (A) 43
1 first changes from "Miyako" to "Low", and then the time T1 measured at the time it changes from "High" to "Low" is sent to the discrimination circuit 44, and the next time measurement is started. Output 31
The time T2 measured when the next change from "quotient" to "low"
is sent to the discrimination circuit 44. If rl + 0 and T2 match -, it is determined that the light shield 10 has passed, and a signal is sent to the time measuring circuit (B) to start time measurement.If they do not match, the light shield 10 is detected at time l111. It is determined that something other than that has passed, and time 12 is regarded as time TI, and the timer side circuit (A) 43 starts a new measurement. Time measurement circuit (B
) 45 starts measurement, a signal passing through the light shield 1o is transmitted from the photoelectric conversion circuit 41', the comparison circuit 42', the time measurement circuit (A) 43', and the discrimination circuit 44' relating to the other light receiving section. The speed calculation circuit 46 calculates the speed based on the time measured when the measurement circuit (B) 45 receives the signal. In this way, the speed of the object to be measured can be measured while distinguishing it from others.
なお、これまでは画定対象が１個の場合について説明し
たが、測定対象が２個以上の場合には、各測定対象にパ
ターンの異なる遮光器を取り付け、それぞれのパターン
を識別する判別回路を用意するととＫより、各測定対象
を区別してその速度を計測できる。Up to now, we have explained the case where there is one object to be defined, but when there are two or more objects to be measured, a light shield with a different pattern is attached to each object to be measured, and a discrimination circuit is prepared to identify each pattern. Then, from K, it is possible to distinguish each measurement object and measure its speed.
以上述べた通り本発明の速度計測システムは測定対象を
他の物体と自動的に識別し、測定を行なう土で大きな便
宜を与えるとともに、従来の同種のシステムに比較して
測定精度の点でも大きな利点を持つものである。As mentioned above, the speed measurement system of the present invention automatically distinguishes the object to be measured from other objects, providing great convenience in measuring soil, and also has greater measurement accuracy than conventional similar systems. It has advantages.
第１図は本発明の二実施例を模式的に示した説明図、第
２図は本発明に用いる遮光器の一実施例の透視図、第３
図は第２図の遮光器を用いた場合の受光器光電変換回路
の出力電流波形を示す図、第４図は本発明の受光部と信
号処理部の回路構成の一例を示すブロック線図である。
１１．１２・・・・・・光源部、１３．１４・・・・・
・光線束、１５．１６・・・・・・受光部、１７・・・
・・・信号処理部、１８・・・・・・測定対象、１９・
・・・・・遮光器、２０．１０・・・・・・測定地点、
２１，２２．２３・・・・・・透光部、２４゜２５・・
・・・・透光部、２６・・・・・取り付は部、２７．２
８・・・・・通し穴、３１・・・・・・出力電流波形、
３２・・・・・・基準レベル、３３．３５．３７．３９
・・・・・・透光期間、３４．３６．３８・・・・・遮
光期間、４１．４１’・・・・・・光電変換回路、４２
．４２’・・・・・・比較回路、４３゜４３’・・・・
・・時間計測回路（Ａ）、４４，４４１・・・・・・判
別回路、４５・・・・・・時間計測回路（Ｂ）、４６・
・・・・・速度演算回路。
第１圏
第２閉
とｌ
第３図FIG. 1 is an explanatory diagram schematically showing two embodiments of the present invention, FIG. 2 is a perspective view of one embodiment of a light shield used in the present invention, and FIG.
The figure is a diagram showing the output current waveform of the photoreceiver photoelectric conversion circuit when the light shield shown in Figure 2 is used, and Figure 4 is a block diagram showing an example of the circuit configuration of the light receiving section and signal processing section of the present invention. be. 11.12...Light source section, 13.14...
・Light ray flux, 15.16... Light receiving part, 17...
...Signal processing unit, 18...Measurement object, 19.
... light shield, 20.10 ... measurement point,
21, 22. 23... Transparent part, 24° 25...
...Transparent part, 26...Mounting part, 27.2
8...Through hole, 31...Output current waveform,
32...Reference level, 33.35.37.39
...... Transmission period, 34.36.38... Light blocking period, 41.41'... Photoelectric conversion circuit, 42
．． 42'...Comparison circuit, 43°43'...
... Time measurement circuit (A), 44, 441 ... Discrimination circuit, 45 ... Time measurement circuit (B), 46.
...Speed calculation circuit. First category second closed and l Figure 3
Claims (1)
うに設けられた光源部と該光源部から放射され前記所定
の位置を通過した光線束を受光し電気信号に変換する受
光部と、該受光部に前記光源部から入射する光線束を測
定対象が遮光する時刻を前記電気信号から検出し前記測
定対象の速度を算出する信号処理部とを備えた速度計測
システムにおいて、前記測定対象に所定の幅の遮光部と
所定の幅の透光部とを交互に配列した遮光器を備え、前
記測定対象をそれ以外の物体とを識別することを特徴と
する速度計測システム。A light source section provided to radiate a °C beam of light to two or more predetermined positions, and a light receiving section that receives the light beam emitted from the light source section and passes through the predetermined positions and converts it into an electrical signal. , a signal processing unit that detects, from the electrical signal, a time at which the measurement target blocks the light flux incident from the light source unit on the light receiving unit and calculates the speed of the measurement target, the measurement target; What is claimed is: 1. A speed measurement system comprising: a light shield in which a light shielding part of a predetermined width and a light transmitting part of a predetermined width are arranged alternately;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18428382A JPS5973771A (en) | 1982-10-20 | 1982-10-20 | Speed measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18428382A JPS5973771A (en) | 1982-10-20 | 1982-10-20 | Speed measuring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5973771A true JPS5973771A (en) | 1984-04-26 |
Family
ID=16150606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18428382A Pending JPS5973771A (en) | 1982-10-20 | 1982-10-20 | Speed measuring system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5973771A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6049266A (en) * | 1983-08-29 | 1985-03-18 | Ono Sokki Co Ltd | Speed measuring method of plural running bodies |
| JPS61195361A (en) * | 1985-02-26 | 1986-08-29 | Takara Co Ltd | Measuring instrument for running toy |
| CN105092883A (en) * | 2015-06-01 | 2015-11-25 | 浙江宇视科技有限公司 | Method for measuring rotating speed of a holder and apparatus thereof |
-
1982
- 1982-10-20 JP JP18428382A patent/JPS5973771A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6049266A (en) * | 1983-08-29 | 1985-03-18 | Ono Sokki Co Ltd | Speed measuring method of plural running bodies |
| JPH0358470B2 (en) * | 1983-08-29 | 1991-09-05 | Ono Sotsuki Kk | |
| JPS61195361A (en) * | 1985-02-26 | 1986-08-29 | Takara Co Ltd | Measuring instrument for running toy |
| CN105092883A (en) * | 2015-06-01 | 2015-11-25 | 浙江宇视科技有限公司 | Method for measuring rotating speed of a holder and apparatus thereof |
| CN105092883B (en) * | 2015-06-01 | 2019-01-15 | 浙江宇视科技有限公司 | A kind of method and device thereof measuring holder revolving speed |
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