JP2000028722A - Method and apparatus for distance measurement by laser beam - Google Patents
Method and apparatus for distance measurement by laser beamInfo
- Publication number
- JP2000028722A JP2000028722A JP10231083A JP23108398A JP2000028722A JP 2000028722 A JP2000028722 A JP 2000028722A JP 10231083 A JP10231083 A JP 10231083A JP 23108398 A JP23108398 A JP 23108398A JP 2000028722 A JP2000028722 A JP 2000028722A
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- light
- distance
- secondary modulation
- distance measuring
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000005259 measurement Methods 0.000 title abstract description 9
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000000691 measurement method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
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- Length Measuring Devices By Optical Means (AREA)
- Measurement Of Optical Distance (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、変調させたレーザ
ー光を用いて測定位置から目標点までの距離を測定する
レーザー光による測距方法およびその装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for measuring a distance from a measurement position to a target point using a modulated laser beam.
【０００２】[0002]
【従来の技術】目標点に反射鏡を設置し、測定位置から
この反射鏡に向けて変調させたレーザー光を照射し、測
定位置においてその反射光を捕捉して距離を算出するレ
ーザー光による測距が従来から行われている。この位相
差式光波距離計と呼ばれる機材を使用する従来のレーザ
ー光による測距の一例を図３により簡単に説明する。図
３は測距装置の構成図で、１は光波距離計、その中の１
１は発振器、１２は送光器、１３は受光器、１４はフィ
ルタ、１６は位相差算出器、１７は信号処理器、２は反
射鏡である。光波距離計１において、発振器１１により
周波数ｆ１で変調されたレーザー光による送光信号ＴＬ
を送光器１２から発射し、光波距離計１から距離Ｄの目
標点に設置された反射鏡２でこの送光信号ＴＬを受け、
反射して反射光信号ＲＬとして反射する。光波距離計１
に到達した反射光信号ＲＬを受光器１３で検出し、発振
器１１による周波数ｆ１のみを通すフィルタ１４により
ノイズを除去し、位相差算出器１６で位相差を算出し、
信号処理器１７で処理して距離データを得る。2. Description of the Related Art A reflecting mirror is installed at a target point, a modulated laser beam is irradiated from the measuring position toward the reflecting mirror, and the reflected light is captured at the measuring position to calculate a distance. Distance has been traditionally used. An example of a conventional distance measurement using a laser beam using a device called a phase difference type optical wave distance meter will be briefly described with reference to FIG. FIG. 3 is a configuration diagram of a distance measuring device, where 1 is a lightwave distance meter, and 1 of them is shown.
1 is an oscillator, 12 is a light transmitter, 13 is a light receiver, 14 is a filter, 16 is a phase difference calculator, 17 is a signal processor, and 2 is a reflecting mirror. In the light wave rangefinder 1, sending the signal TL by a laser beam modulated at a frequency f 1 by the oscillator 11
Is transmitted from the light transmitter 12, and the light transmission signal TL is received from the lightwave distance meter 1 by the reflecting mirror 2 installed at the target point of the distance D.
The light is reflected and reflected as a reflected light signal RL. Lightwave distance meter 1
Is detected by the photodetector 13, noise is removed by the filter 14 that passes only the frequency f 1 by the oscillator 11, and the phase difference is calculated by the phase difference calculator 16,
The data is processed by the signal processor 17 to obtain distance data.
【０００３】ここで、発振器１１における変調周波数ｆ
１は通常、１００ｋＨｚ〜１００ＭＨｚ程度である。反
射鏡２による反射光信号ＲＬが受光器１３に戻ってくる
までの往復距離は２Ｄであるから、変調波の波長をλ
（光速÷ｆ１）とすれば、２Ｄ／λに応じた位相差φ、
すなわち、 φ＝２π・２Ｄ／λ が生じている。ただし２Ｄ／λが整数となる毎に周期的
にφは０となるから、距離Ｄが全く未知である場合には
概算値を別の手段で求めておくか、ｆ１として複数の異
なる周波数を選び、いずれの周波数に対しても共通に得
られた値を距離Ｄとして見なすなどの手順が必要であ
る。Here, the modulation frequency f in the oscillator 11
1 is usually about 100 kHz to 100 MHz. Since the reciprocating distance until the light signal RL reflected by the reflecting mirror 2 returns to the light receiver 13 is 2D, the wavelength of the modulated wave is changed to λ.
(Light speed Δf 1 ), the phase difference φ corresponding to 2D / λ,
That is, φ = 2π · 2D / λ occurs. However, φ periodically becomes 0 every time 2D / λ becomes an integer. Therefore, when the distance D is unknown at all, an approximate value is obtained by another means or a plurality of different frequencies are set as f 1. It is necessary to take a procedure such as selecting a value obtained in common for any frequency as the distance D.
【０００４】レーザー光は単一波長で振幅や位相がそろ
っているという特徴があり、また光束が集中していて直
進性にすぐれるから、このような測距には最適であり、
かつ受光器１３において一般の自然光とは容易に識別で
きるから、原理的にはノイズのほとんどない測距が可能
である。しかし、目標点の周囲または近距離に高い反射
率の物体、たとえば光沢金属体やガラス体等があり、送
光信号ＴＬがこの物体に反射して光波距離計１に入って
くる場合は、その反射光はレーザー光であり、かついま
測定しようとしている反射光信号ＲＬと同じ変調を受け
ているから位相差算出器において識別することができ
ず、目標点と異なる地点の距離を算出してしまうという
問題点がある。[0004] Laser light has the feature that the amplitude and phase are uniform at a single wavelength, and the light flux is concentrated and excellent in straightness, so it is most suitable for such distance measurement.
Moreover, since the light can be easily distinguished from general natural light in the light receiver 13, distance measurement with almost no noise is possible in principle. However, when there is an object having a high reflectivity around or near the target point, for example, a glossy metal body or a glass body, and the light transmission signal TL is reflected by this object and enters the lightwave distance meter 1, The reflected light is a laser beam, and has been subjected to the same modulation as the reflected light signal RL to be measured. Therefore, the reflected light cannot be identified by the phase difference calculator, and the distance between a point different from the target point is calculated. There is a problem.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、このような
問題点を解消し、目標点に設置した反射鏡による反射光
信号だけを識別して常に正確な距離を算出するようにし
た測距方法ならびにその装置を実現することを目的とす
る。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a distance measuring method which always calculates an accurate distance by identifying only a light signal reflected by a reflecting mirror installed at a target point. An object is to realize a method and an apparatus thereof.
【０００６】[0006]
【課題を解決するための手段】本発明のレーザー光によ
る測距方法は、発振器で変調させたレーザー光を目標点
に設置した反射鏡に送り、反射鏡で反射させて受光し、
信号処理して距離データを算出するレーザー光による測
距方法において、反射鏡の位置において反射光の２次変
調を行い、受光後にこの２次変調成分を検出し、２次変
調成分を有する受光信号のみを使用して距離計算を行う
ことを特徴とする。According to the distance measuring method using a laser beam of the present invention, a laser beam modulated by an oscillator is sent to a reflecting mirror installed at a target point, reflected by the reflecting mirror, and received.
In a distance measuring method using laser light for calculating distance data by signal processing, secondary modulation of reflected light is performed at the position of a reflecting mirror, and after receiving light, the secondary modulation component is detected, and a light receiving signal having a secondary modulation component is detected. It is characterized in that distance calculation is performed using only
【０００７】また、本発明のレーザー光による測距装置
は、変調したレーザー光を発振する発振器と、これを送
光信号として送りだす送光器と、前記送光信号を反射し
て反射光信号とする目標点に設置した反射鏡と、この反
射光信号を受光する受光器と、これを信号処理するフィ
ルタと、位相差算出器と、信号処理器とからなるレーザ
ー光による測距装置において、前記反射鏡の位置に２次
変調手段を設け、かつ受光器の出力側に２次変調成分を
検出するフィルタを備え、前記信号処理器をこの２次変
調成分を検出したときのみ距離データを出力するように
接続したことを特徴とし、望ましくは、反射鏡の位置に
おける２次変調手段が反射鏡を鉛直軸回りに回転させる
ものであるか、反射鏡前面に設けた孔あき円板あるいは
偏光板を回転させるものであるか、反射鏡前面に設けた
シャッタを周期的に開閉させるものであるか、あるいは
電気光学的手段または音響光学的手段によるものでり、
さらに望ましくは、反射鏡がコーナーキューブプリズム
である前記の測距装置である。Further, a distance measuring apparatus using laser light according to the present invention comprises an oscillator for oscillating modulated laser light, a light transmitter for transmitting the modulated laser light as a light transmission signal, and a reflected light signal by reflecting the light transmission signal. A reflecting mirror installed at a target point to be reflected, a light receiver for receiving the reflected light signal, a filter for processing the signal, a phase difference calculator, and a distance measuring device using a laser beam including a signal processor; A secondary modulation means is provided at the position of the reflecting mirror, and a filter for detecting a secondary modulation component is provided on the output side of the light receiver, and the signal processor outputs distance data only when the secondary modulation component is detected. Preferably, the secondary modulating means at the position of the reflecting mirror rotates the reflecting mirror about a vertical axis, or a perforated disk or polarizing plate provided on the front surface of the reflecting mirror. Rotate Deli by at which either or shutter provided in the reflector front is intended to periodically open and close, or electro-optical means or acoustic optical means ones,
More preferably, in the distance measuring device, the reflecting mirror is a corner cube prism.
【０００８】[0008]
【発明の実施の形態】本発明によれば、反射鏡の位置に
２次変調手段を設けて反射光を変調し、本来の反射光信
号ＲＬが反射鏡以外のものからの反射光、すなわち測距
におけるノイズから識別できるようにしたから、測距の
精度を向上させることができる。According to the present invention, a secondary modulation means is provided at a position of a reflecting mirror to modulate reflected light, and an original reflected light signal RL is reflected light from a source other than the reflecting mirror, that is, measured. Since the noise can be identified from the noise in the distance, the accuracy of the distance measurement can be improved.
【０００９】[0009]
【実施例】本発明の一実施例の測距を図面により説明す
る。図１はこの実施例の測距装置の構成図で、図３と共
通するものについては同一符号を使用している。１は光
波距離計であるが、図３のものに対してフィルタ１５が
追加されている。一方反射鏡２の位置には２次変調手段
３が設けられている。２次変調手段３は周波数ｆ２で変
調を行う変調器であり、具体例については追って説明す
る。フィルタ１５は２次変調手段３による変調周波数ｆ
２のみを通すフィルタである。送光信号ＴＬは発振器１
１による変調を受けていることは図３における場合と同
様である。しかし本発明においては反射鏡２の位置に２
次変調手段３が設けられているため、反射光信号ＲＬは
２つの周波数ｆ１、ｆ２による変調と、反射光の距離に
よる位相差φの３つの成分を有するものとなっている。BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a diagram showing the configuration of a distance measuring apparatus according to this embodiment. In FIG. Reference numeral 1 denotes a lightwave distance meter, but a filter 15 is added to the one shown in FIG. On the other hand, a secondary modulation means 3 is provided at the position of the reflecting mirror 2. Secondary modulating means 3 is a modulator for modulating the frequency f 2, for specific example will be described later. The filter 15 has a modulation frequency f by the secondary modulation means 3.
This is a filter that allows only 2 to pass. The light transmission signal TL is the oscillator 1
1 is the same as that in FIG. However, in the present invention, 2
Since the next modulating means 3 is provided, the reflected light signal RL has three components of modulation by the two frequencies f 1 and f 2 and a phase difference φ depending on the distance of the reflected light.
【００１０】受光器１３で検出した反射光信号ＲＬは、
フィルタ１４を通るルートで周波数ｆ１と位相差φの信
号が位相差算出器１６に入力される。一方フィルタ１５
を通るルートからは周波数ｆ２の信号が信号処理器１７
に入力される。信号処理器１７は、周波数ｆ２の信号が
入った時のみ距離データを出力するようにフィルタ１５
とＡＮＤ回路で接続されているので、反射鏡２以外の反
射体によるノイズの反射光には周波数ｆ２の成分がない
から信号処理器１７は距離データを出力せず、反射鏡２
による正規の反射光によってのみ距離データが得られ
る。The reflected light signal RL detected by the light receiver 13 is
A signal having a frequency f 1 and a phase difference φ is input to a phase difference calculator 16 through a route passing through the filter 14. On the other hand, filter 15
Signal of the frequency f 2 from the route through the signal processor 17
Is input to Signal processor 17, the filter 15 to output only the distance data when the signal of the frequency f 2 enters
And the AND circuit, the signal processor 17 does not output the distance data because the reflected light of the noise by the reflector other than the reflector 2 has no frequency f2 component.
Distance data can be obtained only by the regular reflected light by
【００１１】つぎに反射鏡２の前面に付設する２次変調
手段３について説明する。変調方法としては機械的手段
によるもの、電気光学的手段によるもの、音響光学効果
によるものなどが可能である。変調周波数ｆ２としては
数１０〜１００Ｈｚ程度の低いものでよいから、機械的
手段によるものも十分使用可能である。 １）機械的手段によるもの 図２（ａ）は、反射鏡２を鉛直軸回りに回転させて変調
を与えるものである。構成が最も簡単で、かつ確実であ
る。図２（ｂ）は、反射鏡２の前面で孔あき円板３１を
回転させて変調を与えるものである。これも構成が比較
的簡単で、かつ確実である。図２（ｃ）は、同様に反射
鏡２の前面で偏光板３２を回転させるものである。図２
（ｄ）は、反射鏡２の前面でルーバ状のシャッタ３３を
周期的に往復動、あるいは回転により開閉させて変調を
与えるものである。Next, the secondary modulation means 3 attached to the front surface of the reflecting mirror 2 will be described. The modulation method can be a mechanical method, an electro-optical method, an acousto-optical effect, or the like. Because it is as low as several 10~100Hz as modulation frequency f 2, it is also possible to sufficiently use by mechanical means. 1) By mechanical means FIG. 2 (a) shows that the reflection mirror 2 is rotated about a vertical axis to give modulation. The simplest and safest construction. FIG. 2B shows a case where the perforated disk 31 is rotated in front of the reflecting mirror 2 to apply modulation. This is also relatively simple and reliable. FIG. 2C shows a case in which the polarizing plate 32 is similarly rotated on the front surface of the reflecting mirror 2. FIG.
(D) is a method in which the louver-shaped shutter 33 is periodically opened and closed by reciprocating or rotating on the front surface of the reflecting mirror 2 to provide modulation.
【００１２】２）電気光学的手段によるもの 反射鏡の前面に結晶などの電気光学効果のある材料を置
き、この材料に電界を加えることにより結晶の複屈折性
を変化させ、通過する光の位相を変化させるものであ
る。電圧により透明度を変化させる液晶光シャッタと呼
ばれるものも実用的である。これらによって位相変調さ
れた波を偏光板等による参照光と干渉させることによ
り、光強度変調に変換することもできる。変調手段が電
界であるから高速変調が可能であるという特徴がある。 ３）音響光学効果によるもの 反射鏡の前面に音響光学効果のある材料（媒質）を置
き、超音波によってこの媒質中の屈折率変化の波による
回折を利用する変調である。変調波はその進行角度、強
度、周波数が変化する。電気光学的手段に比較してそれ
ほど高速ではないが、使いやすいのが長所である。ま
た、反射鏡２は通常の鏡体でもよいが、コーナーキュー
ブプリズムと呼ばれるものは平面精度がすぐれて回帰性
が高く、宇宙間の測距にも使用される程であって、本発
明の測距においても最適である。なお、本発明において
反射鏡を設置する目標点は、地形上の点や構造物などの
静止したものに限定されるわけではなく、地上あるいは
空中を移動する物体であっても何ら差し支えない。2) By electro-optical means A material having an electro-optical effect, such as a crystal, is placed on the front surface of a reflecting mirror, and the birefringence of the crystal is changed by applying an electric field to the material, so that the phase of light passing therethrough is changed. Is to change. What is called a liquid crystal optical shutter in which the transparency is changed by a voltage is also practical. By interfering the phase-modulated wave with reference light from a polarizing plate or the like, the wave can be converted into light intensity modulation. Since the modulating means is an electric field, high-speed modulation is possible. 3) Acousto-optic effect Modulation using a material (medium) having an acousto-optic effect in front of a reflecting mirror and utilizing diffraction by a wave of refractive index change in the medium by ultrasonic waves. The modulated wave changes its traveling angle, intensity, and frequency. Although not as fast as electro-optical means, it has the advantage of being easy to use. The reflecting mirror 2 may be an ordinary mirror body, but a so-called corner cube prism has excellent planar accuracy and high regression, and is used for distance measurement between outer spaces. Ideal for distance. In the present invention, the target point at which the reflecting mirror is installed is not limited to a stationary point such as a point on a terrain or a structure, but may be an object that moves on the ground or in the air.
【００１３】[0013]
【発明の効果】本発明によれば、反射鏡によって反射さ
れた反射光信号のみに２重の変調が与えられていて反射
鏡以外の物体からの反射光と明確に識別できるので、レ
ーザー光による測距においてノイズが除去され、測定精
度が向上するというすぐれた効果を奏する。According to the present invention, only the reflected light signal reflected by the reflector is double-modulated, and can be clearly distinguished from the reflected light from an object other than the reflector. An excellent effect of removing noise in ranging and improving measurement accuracy is achieved.
【図１】本発明の実施例を示す測距装置の構成図であ
る。FIG. 1 is a configuration diagram of a distance measuring apparatus showing an embodiment of the present invention.
【図２】本発明の実施例における２次変調手段の例を示
す概念図である。FIG. 2 is a conceptual diagram illustrating an example of a secondary modulation unit according to the embodiment of the present invention.
【図３】従来の技術を示す測距装置の構成図である。FIG. 3 is a configuration diagram of a distance measuring apparatus showing a conventional technique.
１ 光波距離計 ２ 反射鏡 ３ ２次変調手段 １１ 発振器 １２ 送光器 １３ 受光器 １４、１５ フィルタ １６ 位相差算出器 １７ 信号処理器 ３１ 孔あき円板 ３２ 偏光板 ３３ シャッタ DESCRIPTION OF SYMBOLS 1 Lightwave distance meter 2 Reflector 3 Secondary modulation means 11 Oscillator 12 Transmitter 13 Receiver 14 and 15 Filter 16 Phase difference calculator 17 Signal processor 31 Perforated disk 32 Polarizing plate 33 Shutter
Claims (9)
に設置した反射鏡に送り、反射鏡で反射させて受光し、
信号処理して距離データを算出するレーザー光による測
距方法において、反射鏡の位置において反射光の２次変
調を行い、受光後にこの２次変調成分を検出し、２次変
調成分を有する受光信号のみを使用して距離計算を行う
ことを特徴とするレーザー光による測距方法。1. A laser beam modulated by an oscillator is sent to a reflector set at a target point, reflected by the reflector, and received.
In a distance measuring method using laser light for calculating distance data by signal processing, secondary modulation of reflected light is performed at the position of a reflecting mirror, and after receiving light, the secondary modulation component is detected, and a light receiving signal having a secondary modulation component is detected. A distance measurement method using a laser beam, wherein the distance is calculated using only the distance.
（１１）と、これを送光信号として送りだす送光器（１
２）と、前記送光信号を反射して反射光信号とする目標
点に設置した反射鏡（２）と、この反射光信号を受光す
る受光器（１３）と、これを信号処理するフィルタ（１
４）と、位相差算出器（１６）と、信号処理器（１７）
とからなるレーザー光による測距装置において、前記反
射鏡（２）の位置に２次変調手段（３）を設け、かつ受
光器（１３）の出力側に２次変調成分を検出するフィル
タ（１５）を備え、前記信号処理器（１７）をこの２次
変調成分を検出したときのみ距離データを出力するよう
に接続したことを特徴とするレーザー光による測距装
置。2. An oscillator (11) for oscillating modulated laser light, and a light transmitter (1) for transmitting the modulated laser light as a light transmission signal.
2), a reflecting mirror (2) installed at a target point that reflects the light transmission signal to become a reflected light signal, a light receiver (13) that receives the reflected light signal, and a filter ( 1
4), a phase difference calculator (16), and a signal processor (17)
In a distance measuring apparatus using a laser beam, a secondary modulation means (3) is provided at the position of the reflecting mirror (2), and a filter (15) for detecting a secondary modulation component is provided at an output side of a photodetector (13). ), And the signal processor (17) is connected so as to output distance data only when the secondary modulation component is detected.
段（３）が反射鏡（２）を鉛直軸回りに回転させるもの
である請求項２に記載のレーザー光による測距装置。3. The distance measuring apparatus according to claim 2, wherein the secondary modulating means (3) at the position of the reflecting mirror (2) rotates the reflecting mirror (2) around a vertical axis.
段（３）が反射鏡（２）前面に設けた孔あき円板（３
１）を回転させるものである請求項２に記載のレーザー
光による測距装置。4. A secondary modulation means (3) at the position of the reflecting mirror (2) is provided with a perforated disk (3) provided on the front surface of the reflecting mirror (2).
The distance measuring apparatus using a laser beam according to claim 2, wherein 1) is rotated.
段（３）が反射鏡（２）前面に設けた偏光板（３２）を
回転させるものである請求項２に記載のレーザー光によ
る測距装置。5. The laser beam according to claim 2, wherein the secondary modulation means (3) at the position of the reflecting mirror (2) rotates a polarizing plate (32) provided on the front surface of the reflecting mirror (2). Distance measuring device.
段（３）が反射鏡（２）前面に設けたシャッタ（３３）
を周期的に開閉させるものである請求項２に記載のレー
ザー光による測距装置。6. A shutter (33) provided on the front surface of the reflecting mirror (2) by the secondary modulation means (3) at the position of the reflecting mirror (2).
3. The distance measuring apparatus according to claim 2, wherein the distance is periodically opened and closed.
段が電気光学的手段によるものである請求項２に記載の
レーザー光による測距装置。7. The laser beam distance measuring apparatus according to claim 2, wherein the secondary modulating means at the position of the reflecting mirror (2) is an electro-optical means.
段が音響光学的手段によるものである請求項２に記載の
レーザー光による測距装置。8. The distance measuring apparatus using laser light according to claim 2, wherein the secondary modulation means at the position of the reflecting mirror (2) is an acousto-optic means.
ムである請求項２ないし８のいずれかに記載のレーザー
光による測距装置。9. The distance measuring apparatus according to claim 2, wherein the reflecting mirror is a corner cube prism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10231083A JP2000028722A (en) | 1998-07-14 | 1998-07-14 | Method and apparatus for distance measurement by laser beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10231083A JP2000028722A (en) | 1998-07-14 | 1998-07-14 | Method and apparatus for distance measurement by laser beam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000028722A true JP2000028722A (en) | 2000-01-28 |
Family
ID=16918028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10231083A Pending JP2000028722A (en) | 1998-07-14 | 1998-07-14 | Method and apparatus for distance measurement by laser beam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000028722A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1619469A1 (en) * | 2004-07-22 | 2006-01-25 | Bea S.A. | Laser scanning and sensing device for detection around automatic doors |
| JP2006522935A (en) * | 2003-04-08 | 2006-10-05 | ジ ユニバーシティ オブ ワイカト | Range detection system |
| US7362224B2 (en) | 2004-07-22 | 2008-04-22 | B.E.A. S.A. | Thermally sensitive array device for presence detection around automatic doors |
| CN102506721A (en) * | 2011-11-07 | 2012-06-20 | 中南大学 | Laser-based deformation displacement measurement method |
| KR101424665B1 (en) | 2013-07-02 | 2014-08-01 | 한국표준과학연구원 | Range Measuring Apparatus |
| CN109612399A (en) * | 2018-09-26 | 2019-04-12 | 中铁第勘察设计院集团有限公司 | Displacement and deformation measurement device and method based on PSD and laser ranging |
| KR102065870B1 (en) * | 2019-01-04 | 2020-01-13 | 경북대학교 산학협력단 | Method for securing field of view of a retro-reflector in laser measurement and system for executing same |
| CN115754981A (en) * | 2022-10-31 | 2023-03-07 | 深圳市速腾聚创科技有限公司 | Laser control method, calibration method and device based on galvanometer and laser radar |
-
1998
- 1998-07-14 JP JP10231083A patent/JP2000028722A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006522935A (en) * | 2003-04-08 | 2006-10-05 | ジ ユニバーシティ オブ ワイカト | Range detection system |
| EP1619469A1 (en) * | 2004-07-22 | 2006-01-25 | Bea S.A. | Laser scanning and sensing device for detection around automatic doors |
| EP1832866A2 (en) | 2004-07-22 | 2007-09-12 | Bea S.A. | A door sensor system for detecting a target object |
| US7349074B2 (en) | 2004-07-22 | 2008-03-25 | B.E.A. Sa | Laser scanning and sensing device for detection around automatic doors |
| US7362224B2 (en) | 2004-07-22 | 2008-04-22 | B.E.A. S.A. | Thermally sensitive array device for presence detection around automatic doors |
| US7446862B2 (en) | 2004-07-22 | 2008-11-04 | B.E.A.S.A. | Door sensor system for detecting a target object |
| CN102506721A (en) * | 2011-11-07 | 2012-06-20 | 中南大学 | Laser-based deformation displacement measurement method |
| KR101424665B1 (en) | 2013-07-02 | 2014-08-01 | 한국표준과학연구원 | Range Measuring Apparatus |
| CN109612399A (en) * | 2018-09-26 | 2019-04-12 | 中铁第勘察设计院集团有限公司 | Displacement and deformation measurement device and method based on PSD and laser ranging |
| KR102065870B1 (en) * | 2019-01-04 | 2020-01-13 | 경북대학교 산학협력단 | Method for securing field of view of a retro-reflector in laser measurement and system for executing same |
| CN115754981A (en) * | 2022-10-31 | 2023-03-07 | 深圳市速腾聚创科技有限公司 | Laser control method, calibration method and device based on galvanometer and laser radar |
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