JPH0410592B2 - - Google Patents
Info
- Publication number
- JPH0410592B2 JPH0410592B2 JP58205098A JP20509883A JPH0410592B2 JP H0410592 B2 JPH0410592 B2 JP H0410592B2 JP 58205098 A JP58205098 A JP 58205098A JP 20509883 A JP20509883 A JP 20509883A JP H0410592 B2 JPH0410592 B2 JP H0410592B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical fiber
- optical
- objective lens
- measured
- 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.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
- G01S17/32—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
- G01S17/36—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated with phase comparison between the received signal and the contemporaneously transmitted signal
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、反射体としての被測定体の離間距離
を測定する光フアイバーによる距離測定装置に係
り、この距離測定装置における遅延補正装置に関
する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a distance measuring device using an optical fiber for measuring the distance between objects to be measured as a reflector, and to a delay correction device in this distance measuring device.
既に提案されているこの種の光フアイバーによ
る距離測定装置は、例えば、ダムの水位や石油タ
ンクの液位等の測定に使用されている。
This type of optical fiber distance measuring device that has already been proposed is used to measure, for example, the water level of a dam or the liquid level of an oil tank.
即ち、上記ダムの水位や液位の測定手段として
使用されるこの種の光フアイバーによる距離測定
装置は、第１図に示されるように、例えば、レー
ザー光による光源１の光をパルス発振器２で適当
な周波数のパルス信号に変調し、このパルス発振
器２からのパルス信号をハーフミラー（半透鏡）
３ａによる光分岐装置３を介して二方向に分光
し、この光分岐装置３の上記ハーフミラー３ａで
反射した反射光を受光器４へ送信し、この受光器
４で受光した変調波によるパルス信号を電気信号
に変換して位相比較器５に送信し、他方、上記光
分岐装置３の上記ハーフミラー３ａを透過したパ
ルス信号を送り光フアイバー６を通して対物レン
ズ７に伝送し、この対物レンズ７による平行光を
コーナーミラーによる被測定体８に入射し、この
被測定体８からの反射光を、再び、上記対物レン
ズ７を通して戻り光フアイバー９へ伝送し、この
戻り光フアイバー９を伝送されるパルス信号を他
の受光器１０で受光し、この受光器１０のパルス
信号を電気信号に変換して上記位相比較器５へ送
信し、この位相比較器５によつて上記ハーフミラ
ー３ａからのパルス信号と上記被測定体８からの
パルス信号とを比較測定することにより、上記対
物レンズ７から被測定物８までの長さ（光路長）
を測定するようになつている。 That is, this type of optical fiber distance measuring device used as a means for measuring the water level or liquid level in the dam uses, for example, a laser beam from a light source 1 using a pulse oscillator 2, as shown in FIG. Modulate it into a pulse signal of an appropriate frequency, and send the pulse signal from the pulse oscillator 2 to a half mirror (semi-transparent mirror).
3a, the light is split into two directions through the optical branching device 3, and the reflected light reflected by the half mirror 3a of the optical branching device 3 is transmitted to the light receiver 4, and a pulse signal is generated by the modulated wave received by the light receiver 4. is converted into an electrical signal and transmitted to the phase comparator 5, and on the other hand, the pulse signal transmitted through the half mirror 3a of the optical branching device 3 is transmitted to the objective lens 7 through the optical fiber 6, and the pulse signal is transmitted by the objective lens 7. Parallel light is incident on the object to be measured 8 by a corner mirror, and the reflected light from the object to be measured 8 is again transmitted to the return optical fiber 9 through the objective lens 7, and the transmitted pulse is transmitted through the return optical fiber 9. The signal is received by another light receiver 10, and the pulse signal of this light receiver 10 is converted into an electric signal and transmitted to the phase comparator 5, which converts the pulse signal from the half mirror 3a. By comparing and measuring the pulse signal from the object to be measured 8, the length from the objective lens 7 to the object to be measured 8 (optical path length) is determined.
is now being measured.
特に、上述した光フアイバーによる距離測定装
置は、可撓性の光フアイバーを使用している関係
上、上記対物レンズ７の位置を自由に移動して被
測定物８までの距離を測定し得るようになつてい
る。 In particular, since the optical fiber distance measuring device described above uses a flexible optical fiber, the distance to the object to be measured 8 can be measured by freely moving the position of the objective lens 7. It's getting old.
しかしながら、上述した光フアイバーによる距
離測定装置は、対物レンズ７を自由に移動して配
置できるけれども、上記光分岐装置３と対物レン
ズ７との間に配線される送り光フアイバー６と戻
り光フアイバー９との長さが同じでない関係上、
上記両光フアイバー６と９の長さを、予め、上記
位相比較器５に記憶しておき、上記両光フアイバ
ー６と９とによる遅延を補正して、実測距離を算
出しなければならず、しかも、予め、正確に上記
両光フアイバー６，９の長さを実測しておかなけ
ればならない等の難点がある。
However, in the distance measuring device using optical fibers described above, although the objective lens 7 can be freely moved and arranged, the sending optical fiber 6 and the returning optical fiber 9 wired between the optical branching device 3 and the objective lens 7 are Due to the fact that the lengths are not the same,
The lengths of the optical fibers 6 and 9 must be stored in the phase comparator 5 in advance, and the actual measured distance must be calculated by correcting the delay caused by the optical fibers 6 and 9. Moreover, there is a problem in that the lengths of both the optical fibers 6 and 9 must be measured accurately in advance.
本発明は、上述した難点を解消するために、対
物レンズに近接して光分岐装置を配置し、この光
分岐装置から受光器に接続される分岐光フアイバ
ーと上記光分岐装置から他の受光器に接続される
戻り光フアイバーとの長さを同じにして、上記両
光フアイバーの長さの差による伝送の遅延による
誤差を解消し、上記対物レンズから被測定体まで
の離間距離を正確に測定し得るようにしたことを
目的とする距離測定装置を提供するものである。
In order to solve the above-mentioned difficulties, the present invention arranges an optical branching device close to an objective lens, and connects a branching optical fiber from the optical branching device to a light receiver, and a branching optical fiber connected from the optical branching device to another light receiver. The length of the return optical fiber connected to the optical fiber is the same, eliminating errors caused by transmission delays due to the difference in length between the two optical fibers, and accurately measuring the distance from the objective lens to the object to be measured. To provide a distance measuring device that is capable of
本発明は、光源からの光をパルス信号に変調す
るパルス発振器の光路上に主光フアイバーの一端
に光分岐装置を設け、この光分岐装置に分岐光フ
アイバーを介して受光器を接続し、この受光器に
位相比較器を連結し、他方、上記光分岐装置に対
物レンズを付設し、この対物レンズに被測定体か
らの反射光を伝送し、しかも上記分岐光フアイバ
ーと同じ長さの戻り光フアイバーを介して他の受
光器に受光するようにし、この受光器に上記位相
比較器を連結して構成したものである。
The present invention provides an optical branching device at one end of a main optical fiber on the optical path of a pulse oscillator that modulates light from a light source into a pulse signal, and connects a light receiver to this optical branching device via a branching optical fiber. A phase comparator is connected to the light receiver, and an objective lens is attached to the optical branching device, and the reflected light from the object to be measured is transmitted to the objective lens, and the return light having the same length as the branching optical fiber is transmitted to the objective lens. The light is received by another light receiver via a fiber, and the phase comparator is connected to this light receiver.
以下、本発明を図示の一実施例について説明す
る。
Hereinafter, the present invention will be described with reference to an illustrated embodiment.
なお、本発明は、上述した具体例と同一構成部
材には、同じ符号を附して説明する。 It should be noted that the present invention will be described with the same reference numerals attached to the same constituent members as in the above-described specific example.
第２図において、符号１は、例えば、レーザー
光による光源であつて、この光源１からの光は、
パルス発振器２へ伝送されて、こゝで、適当な周
波数のパルス信号に変調されるようになつてい
る。又、このパルス発振器２の光路上には、主光
フアイバー１１が配設されており、この主光フア
イバー１１の一端部には、例えば、光カプラーに
よる光分岐装置１２が設けられている。さらに、
この光分岐装置１２には上記主光フアイバー１１
から分岐したきわめて短かいリレー光フアイバー
１３と分岐光フアイバー１４が区分して設けられ
ており、この分岐光フアイバー１４の一端部は、
例えば受光素子のような受光器４に接続されてい
る。さらに又、この受光器４には、この受光器４
で電気信号に変換された変調波の位相を比較する
位相比較器５が連結されている。 In FIG. 2, reference numeral 1 is a light source using, for example, a laser beam, and the light from this light source 1 is
The signal is transmitted to a pulse oscillator 2, where it is modulated into a pulse signal of an appropriate frequency. A main optical fiber 11 is disposed on the optical path of the pulse oscillator 2, and at one end of the main optical fiber 11, an optical branching device 12 using, for example, an optical coupler is provided. moreover,
This optical branching device 12 includes the main optical fiber 11.
A very short relay optical fiber 13 and a branch optical fiber 14 are separately provided, and one end of this branch optical fiber 14 is
For example, it is connected to a light receiver 4 such as a light receiving element. Furthermore, this light receiver 4 has a
A phase comparator 5 for comparing the phases of the modulated waves converted into electrical signals is connected thereto.
他方、上記光分岐装置１２には、対物レンズ７
が、上記リレー光フアイバー１３を介して接続さ
れており、この対物レンズ７は、上記光分岐装置
１２に接続したリレー光フアイバー１３からの出
力光を平行光にして出射するようになつている。
さらに、この対物レンズ７の前方には、距離測定
の相手方となるミラーコーナーによる被測定体
（被測定物）８が配設されており、この被測定体
８からの反射光は上記対物レンズ７に再び入射し
得るようになつている。さらに又、この対物レン
ズ７には、上記分岐光フアイバー１４と同じ長さ
の戻り光フアイバー１５が上記被測定体８からの
反射光を受光して伝送し得るようにして配設され
ており、この戻り光フアイバー１５の一端部に
は、例えば、受光素子による他の受光器１０が設
けられている。又、この受光器１０には、上記位
相比較器５が連結されており、上記受光器１０
は、上記対物レンズ７と被測定体８とを往復した
光（パルス信号）を電気信号に変換し、この電気
信号に変換された変調波は、上記位相比較器５へ
送信されるようになつている。 On the other hand, the optical branching device 12 includes an objective lens 7.
are connected via the relay optical fiber 13, and the objective lens 7 converts the output light from the relay optical fiber 13 connected to the optical branching device 12 into parallel light and emits it.
Furthermore, in front of this objective lens 7, an object to be measured (measured object) 8 formed by a mirror corner, which is the other party for distance measurement, is arranged, and the reflected light from this object to be measured 8 is reflected from the objective lens 7. It has become possible for it to be incident again. Furthermore, a return optical fiber 15 having the same length as the branch optical fiber 14 is disposed in the objective lens 7 so as to be able to receive and transmit the reflected light from the object to be measured 8. At one end of the return optical fiber 15, another light receiver 10 is provided, for example, a light receiving element. Further, the above-mentioned phase comparator 5 is connected to this light receiver 10, and the above-mentioned light receiver 10
converts the light (pulse signal) that has traveled back and forth between the objective lens 7 and the object to be measured 8 into an electrical signal, and the modulated wave converted into the electrical signal is transmitted to the phase comparator 5. ing.
なお、上記主光フアイバー１１、分岐光フアイ
バー１４及び上記戻り光フアイバー１５は、一本
の光ケーブル１６によつて構成されている。 Note that the main optical fiber 11, the branch optical fiber 14, and the return optical fiber 15 are constituted by one optical cable 16.
従つて、上記光源１からの光は、パルス発振器
２へ伝送されて、こゝで、パルス信号に変調され
る。そして、このパルス発振器２のパルス信号
は、主光フアイバー１１内を通して上記光分岐装
置１２へ伝送され、この光分岐装置１２は、上記
パルス信号を二方向に分岐し、こゝで分岐した一
方のパルス信号は、分岐光フアイバー１４を通し
て受光器４へ伝送され、この受光器４は、受光し
たパルス信号を電気信号に変換して上記位相比較
器５へ送信するようになつている。 Therefore, the light from the light source 1 is transmitted to the pulse oscillator 2, where it is modulated into a pulse signal. The pulse signal of this pulse oscillator 2 is transmitted to the optical branching device 12 through the main optical fiber 11, and this optical branching device 12 branches the pulse signal into two directions, and one of the branched signals is transmitted to the optical branching device 12. The pulse signal is transmitted to the optical receiver 4 through the branched optical fiber 14, and the optical receiver 4 converts the received pulse signal into an electrical signal and transmits it to the phase comparator 5.
一方、上記光分岐装置１２で分岐した他方のパ
ルス信号は、リレー光フアイバー１３を介して対
物レンズ７に伝送され、この対物レンズ７による
平行を上記コーナーミラーによる被測定体８に入
射し、この被測定体８からの反射光は、再び、上
記対物レンズ７を通して上記戻り光フアイバー１
５へ伝送される。しかして、この戻り光フアイバ
ー１５に伝送されるパルス信号は、他の受光器１
０によつて受光される。さらに、この受光器１０
は受光したパルス信号を電気信号に変換して上記
位相比較器５へ送信される。 On the other hand, the other pulse signal branched by the optical branching device 12 is transmitted to the objective lens 7 via the relay optical fiber 13, parallel by the objective lens 7, and incident on the object to be measured 8 by the corner mirror. The reflected light from the object to be measured 8 passes through the objective lens 7 again and enters the return optical fiber 1.
5. Therefore, the pulse signal transmitted to the return optical fiber 15 is transmitted to the other optical receiver 1.
The light is received by 0. Furthermore, this light receiver 10
converts the received pulse signal into an electrical signal and transmits it to the phase comparator 5.
このようにして上記位相比較器５に受信された
上記両受光器４と１０からの両電気信号は、比較
測定され、これによつて、上記対物レンズ７から
被測定物８までの離間距離を測定するようになつ
ている。 The electrical signals from the optical receivers 4 and 10 received by the phase comparator 5 in this manner are compared and measured, thereby determining the distance from the objective lens 7 to the object to be measured 8. It's starting to be measured.
次に、本発明を計算式によつて説明する。 Next, the present invention will be explained using calculation formulas.
上記主光フアイバー１１の長さをｌとし、上記
分岐光フアイバー１４と上記戻り光フアイバー１
５の長さを同じ長さのl′とし、さらに、上記対物
レンズ７と被測定物８との離間距離をＳとし、光
速をＣとする。 The length of the main optical fiber 11 is l, and the branch optical fiber 14 and the return optical fiber 1 are
5 are the same length l', the distance between the objective lens 7 and the object to be measured 8 is S, and the speed of light is C.
しかして、上記光源１を出射した変調波が、前
述したように、上記両光フアイバー１４，１５を
通して両受光器４と１０に到達するまでの位相差
を求める。 As described above, the phase difference between the modulated waves emitted from the light source 1 until it reaches the optical receivers 4 and 10 through the optical fibers 14 and 15 is determined.
なお、こゝで使用される各光フアイバーは、グ
レーデツドインデツクスフアイバーであつて、光
源１は、例えばレーザー、LED（発光ダイオー
ド）若しくはLDであり、その発振波長に対して
光フアイバーのモード分散は、最小に押えられて
おり、約２〜3GHz・Kmの6dB帯域が確保されて
いるものとする。 Each optical fiber used here is a graded index fiber, and the light source 1 is, for example, a laser, an LED (light emitting diode), or an LD, and the mode of the optical fiber is determined for its oscillation wavelength. It is assumed that dispersion is kept to a minimum and a 6 dB band of approximately 2 to 3 GHz/Km is secured.
上記両光フアイバー１１，１４，１５内での光
路長をｌ，l′に対し、これをＬ，L′と考えると、
上記受光器１０に入射する光の変調波の位相
θ10は、
θ10＝2πfＬ／Ｃ＋2πf2S／Ｃ＋2πfL′／Ｃとなる
。 If the optical path lengths in the optical fibers 11, 14, and 15 are considered to be L and L', the phase θ 10 of the modulated wave of the light incident on the optical receiver 10 is θ 10 =2πfL/C+2πf2S/C+2πfL'/C.
但し、ｆ：周波数
同様に、上記受光器４に入射する光の変調波の
位相θ4は、
θ4＝2πfＬ／Ｃ＋2πfL′／Ｃ
両者の位相を減算して比較すると、
θ10−θ4＝2πf2S／Ｃ
となり、上記両光フアイバーによる遅延分2πfＬ／Ｃ
及び2πfL′／Ｃは消去され、その値に関係なく、上記
対物レンズ７と被測定体８の距離Ｓに起因する遅
延分が、上記位相比較器５で算出される。 However, f: Frequency Similarly, the phase θ 4 of the modulated wave of the light incident on the photoreceiver 4 is θ 4 = 2πfL/C + 2πfL'/C If the two phases are subtracted and compared, θ 10 −θ 4 = 2πf2S/C, and the delays caused by both optical fibers 2πfL/C and 2πfL'/C are eliminated, and regardless of their values, the delay due to the distance S between the objective lens 7 and the object to be measured 8 becomes the It is calculated by the phase comparator 5.
このようにして本発明は、対物レンズ７と受光
器１０との間に、分岐光フアイバー１４と同じ長
さの戻り光フアイバー１５を設け、上記両受光器
４と１０とで受光した遅延位相を上記位相比較器
５によつて演算して、上記対物レンズ７と被測定
体８との離間距離を測定することができる。 In this way, the present invention provides a return optical fiber 15 having the same length as the branching optical fiber 14 between the objective lens 7 and the optical receiver 10, so that the delayed phase of the light received by the optical receivers 4 and 10 can be adjusted. The separation distance between the objective lens 7 and the object to be measured 8 can be measured by calculation by the phase comparator 5.
因に、本発明は、パルス変調器２による光源の
変調手段や位相比較器５を使用した具体例につい
て説明したけれども、本発明の要旨を変更しない
範囲内で、例えば、光波距離計を使用するように
設計変更することは自由である。又、上記被測定
体８は、例えば、コーナーミラーを使用したもの
について説明したけれども、通常の被写体であつ
ても差支えないこと勿論である。 Incidentally, although the present invention has been described with reference to a specific example using the light source modulation means by the pulse modulator 2 and the phase comparator 5, it is also possible to use, for example, a light wave distance meter without departing from the gist of the present invention. You are free to change the design as you like. Further, although the object to be measured 8 has been described using, for example, a corner mirror, it is of course possible to use a normal object.
以上述べたように本発明によれば、光源１から
の光をパルス信号に変調するパルス発振器２の光
路上に主光フアイバー１１を配設し、この主光フ
アイバー１１の一端部に光分岐装置１２を設け、
この光分岐装置１２に分岐光フアイバー１４を介
して受光器４を接続し、この受光器４に位相比較
器５を連結し、他方、上記光分岐装置４に対物レ
ンズ７を付設し、この対物レンズ７に被測定体８
からの反射光を伝送し、しかも、上記分岐光フア
イバー１４と同じ長さの戻り光フアイバー１５を
介して他の受光器１０に受光するようにし、この
受光器１０に上記位相比較器５を連結してあるの
で、光フアイバーによるフレキシビリテイを有効
に利用することができるばかりでなく、両光フア
イバーの長さの差による伝送の遅延による誤差を
なくして正確に離間距離を測定することができ
る。さらに、本発明は対物レンズまでのフアイバ
ー長を随意とすることができ、汎用性をきわめて
高くすることができる。また従来では装置自体を
移動して被測定体を測定していたけれども本発明
では前述の構成としたので、自由に被測定体をね
らうことができる。
As described above, according to the present invention, the main optical fiber 11 is disposed on the optical path of the pulse oscillator 2 that modulates the light from the light source 1 into a pulse signal, and the optical branching device is attached to one end of the main optical fiber 11. 12,
A light receiver 4 is connected to this light branching device 12 via a branching optical fiber 14, and a phase comparator 5 is connected to this light receiver 4. On the other hand, an objective lens 7 is attached to the light branching device 4, and this objective lens 7 is attached to the light branching device 4. Measured object 8 on lens 7
The reflected light is transmitted to another optical receiver 10 via a return optical fiber 15 having the same length as the branch optical fiber 14, and the phase comparator 5 is connected to this optical receiver 10. This not only makes it possible to effectively utilize the flexibility of optical fibers, but also eliminates errors caused by transmission delays due to the difference in length between the two optical fibers, making it possible to accurately measure separation distances. . Furthermore, in the present invention, the length of the fiber up to the objective lens can be made arbitrary, making it extremely versatile. Furthermore, in the past, the object to be measured was measured by moving the apparatus itself, but the present invention has the above-described configuration, so that the object to be measured can be freely aimed.
第１図は、既に提案されている距離測定装置を
示す線図、第２図は、本発明による距離測定装置
を示す線図である。
１…光源、２…パルス発振器、４…受光器、５
…位相比較器、７…対物レンズ、８…被測定体、
１０…受光器、１１…主光フアイバー、１２…光
分岐装置、１４…分岐光フアイバー、１５…戻り
光フアイバー、１６…光ケーブル。
FIG. 1 is a diagram showing a distance measuring device that has already been proposed, and FIG. 2 is a diagram showing a distance measuring device according to the present invention. 1... Light source, 2... Pulse oscillator, 4... Light receiver, 5
... Phase comparator, 7... Objective lens, 8... Measured object,
DESCRIPTION OF SYMBOLS 10... Light receiver, 11... Main optical fiber, 12... Optical branching device, 14... Branch optical fiber, 15... Return optical fiber, 16... Optical cable.
Claims (1)
発生器の光路上に主光フアイバーを配設し、この
主光フアイバーの一端部に光分岐装置を設け、こ
の光分岐装置に分岐光フアイバーを介して受光器
を接続し、この受光器の位相比較器を連結し、他
方、上記光分岐装置に対物レンズを付設し、この
対物レンズに被測定体からの反射光を伝送し、し
かも上記分岐光フアイバーと同じ長さの戻り光フ
アイバーを介して他の受光器に受光するように
し、この受光器に上記位相比較器を連結し、上記
光分岐装置で分岐された一方の光を上記分岐光フ
アイバーを通して一方の受光器へ伝送し、上記対
物レンズを通した被測定体からの反射光を戻り光
フアイバーを通して他方の受光器へ伝送し、これ
らを上記位相比較器で受信するようにしたことを
特徴とする距離測定装置。1. A main optical fiber is arranged on the optical path of a pulse generator that modulates light from a light source into a pulse signal, an optical branching device is provided at one end of this main optical fiber, and a signal is connected to this optical branching device via the branching optical fiber. A light receiver is connected to the light receiver, and a phase comparator of the light receiver is connected to the light receiver, and an objective lens is attached to the light branching device, and the reflected light from the object to be measured is transmitted to the objective lens, and the branched light is transmitted to the objective lens. The light is received by another optical receiver through a return optical fiber having the same length as the optical fiber, the phase comparator is connected to this optical receiver, and one of the lights branched by the optical branching device is sent to the branching optical fiber. The light reflected from the object to be measured through the objective lens is transmitted to the other light receiver through the return optical fiber, and the light is received by the phase comparator. distance measuring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20509883A JPS6097288A (en) | 1983-11-01 | 1983-11-01 | Distance measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20509883A JPS6097288A (en) | 1983-11-01 | 1983-11-01 | Distance measuring apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6097288A JPS6097288A (en) | 1985-05-31 |
| JPH0410592B2 true JPH0410592B2 (en) | 1992-02-25 |
Family
ID=16501385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20509883A Granted JPS6097288A (en) | 1983-11-01 | 1983-11-01 | Distance measuring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6097288A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013545976A (en) * | 2010-10-25 | 2013-12-26 | 株式会社ニコン | Apparatus, optical assembly, method of inspecting or measuring an object, and method of manufacturing a structure |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0325182U (en) * | 1989-07-20 | 1991-03-14 | ||
| US8659749B2 (en) * | 2009-08-07 | 2014-02-25 | Faro Technologies, Inc. | Absolute distance meter with optical switch |
| US9772394B2 (en) | 2010-04-21 | 2017-09-26 | Faro Technologies, Inc. | Method and apparatus for following an operator and locking onto a retroreflector with a laser tracker |
| US9482529B2 (en) | 2011-04-15 | 2016-11-01 | Faro Technologies, Inc. | Three-dimensional coordinate scanner and method of operation |
| US9686532B2 (en) | 2011-04-15 | 2017-06-20 | Faro Technologies, Inc. | System and method of acquiring three-dimensional coordinates using multiple coordinate measurement devices |
| US9164173B2 (en) | 2011-04-15 | 2015-10-20 | Faro Technologies, Inc. | Laser tracker that uses a fiber-optic coupler and an achromatic launch to align and collimate two wavelengths of light |
| US9041914B2 (en) | 2013-03-15 | 2015-05-26 | Faro Technologies, Inc. | Three-dimensional coordinate scanner and method of operation |
| US9395174B2 (en) | 2014-06-27 | 2016-07-19 | Faro Technologies, Inc. | Determining retroreflector orientation by optimizing spatial fit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZA824061B (en) * | 1981-06-09 | 1983-04-27 | L Bolkow | Distance measurement method and apparatus for its performance |
-
1983
- 1983-11-01 JP JP20509883A patent/JPS6097288A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013545976A (en) * | 2010-10-25 | 2013-12-26 | 株式会社ニコン | Apparatus, optical assembly, method of inspecting or measuring an object, and method of manufacturing a structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6097288A (en) | 1985-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5752040B2 (en) | Compact optical fiber arrangement for anti-chirp FMCW coherent laser radar | |
| CN109254277B (en) | Chip-scale LIDAR with a single 2D MEMS scanner | |
| US4397551A (en) | Method and apparatus for optical fiber fault location | |
| EP0754939B1 (en) | Optical fibre detecting device | |
| US20210285755A1 (en) | Optical interference measurement apparatus | |
| JP2011039052A5 (en) | ||
| FR1509786A (en) | Method and device for remote measurement using modulated light beams | |
| JPH0410592B2 (en) | ||
| CN113383246A (en) | FMCW laser radar system | |
| CN115639567B (en) | lidar | |
| EP0125758A3 (en) | Coherent reflectometers | |
| US6329648B1 (en) | Phase locked loop fiber optic sensor system | |
| US6008487A (en) | Optical-fiber inspection device | |
| JP5180594B2 (en) | Interferometer | |
| JP2666827B2 (en) | Light measurement method | |
| CN116626696A (en) | Frequency modulation continuous wave laser range unit | |
| KR960042027A (en) | Optical pressure detection method and optical pressure detection device | |
| JP2750609B2 (en) | Gas detector | |
| DE3878194D1 (en) | REFLECTION END AND RECEIVING DEVICE FOR A BIDIRECTIONAL FO COMMUNICATION SYSTEM. | |
| JPH0365871B2 (en) | ||
| US4397548A (en) | Distance measuring system | |
| CA1145927A (en) | Method and apparatus for optical fiber fault location | |
| CN210690828U (en) | Laser radar receiving device, laser radar transmitting device and laser radar transmitting system | |
| JPH05312953A (en) | Optical ranging system | |
| Davies et al. | Displacement sensor using a compensated fibre link |