JP2660788B2 - Underwater turbidity distribution measurement device - Google Patents
Underwater turbidity distribution measurement deviceInfo
- Publication number
- JP2660788B2 JP2660788B2 JP33382092A JP33382092A JP2660788B2 JP 2660788 B2 JP2660788 B2 JP 2660788B2 JP 33382092 A JP33382092 A JP 33382092A JP 33382092 A JP33382092 A JP 33382092A JP 2660788 B2 JP2660788 B2 JP 2660788B2
- Authority
- JP
- Japan
- Prior art keywords
- laser
- reflected light
- turbidity distribution
- sea
- light
- 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 - Fee Related
Links
Landscapes
- Optical Radar Systems And Details Thereof (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は海中濁度分布測定装置、
特にレーザ光を用いた海中濁度分布測定装置に関するも
のである。BACKGROUND OF THE INVENTION The present invention relates to an underwater turbidity distribution measuring device,
In particular, the present invention relates to an underwater turbidity distribution measuring device using laser light.
【０００２】[0002]
【従来の技術】従来のレーザ光を用いた海中濁度分布測
定装置においては、図５に示すようにレーザ発振器１か
らのレーザ光をビームコリメータ２を介して濁度分布を
測定すべき位置の上方に配置したミラー３に発射し、こ
のミラー３をスキャンモータ４によって駆動し、海底５
にレーザ光６を所定範囲に亘り発射し、海中における濁
りを形成する微粒子や海底５からのレーザ反射光をレン
ズ７を介して検出器８によって検出し、図６に示すよう
にレーザ光発射時刻Ｔ１から反射光受光時刻Ｔ２迄の時
間によって濁りを形成する微粒子の位置や海底５の深度
を測定するようにしている。2. Description of the Related Art In a conventional underwater turbidity distribution measuring apparatus using a laser beam, a laser beam from a laser oscillator 1 is transmitted through a beam collimator 2 to a position where the turbidity distribution is to be measured, as shown in FIG. It fires on a mirror 3 arranged above, and this mirror 3 is driven by a scan motor 4 to
Laser light 6 is emitted over a predetermined range, and fine particles that form turbidity in the sea and laser reflected light from the seabed 5 are detected by a detector 8 via a lens 7, and the laser light emission time is shown in FIG. The position of fine particles forming turbidity and the depth of the seabed 5 are measured according to the time from T1 to the reflected light reception time T2.
【０００３】[0003]
【発明が解決しようとする課題】然しながらこのような
従来の海中濁度分布測定装置においては、図７のハッチ
ングに示すような濁りを形成する微粒子から反射される
反射光を検出して海中の濁度分布を計測する場合、海中
上部から反射される反射光に比べ海中下部から反射され
る反射光は海中上部の微粒子によって往路、復路で２重
に減衰するため極めて微弱となり、検出器８によって検
出できないようになるため海中下部の濁度分布を測定で
きないようになる。またレーザ光を強くすれば、魚類等
に悪影響を及ぼすようになる。However, in such a conventional underwater turbidity distribution measuring apparatus, the reflected light reflected from fine particles forming turbidity as shown by hatching in FIG. When measuring the degree distribution, the reflected light reflected from the lower part of the sea is extremely weakened by the fine particles in the upper part of the sea and attenuated twice in the outward and return paths, compared to the reflected light reflected from the upper part of the sea. It will not be possible to measure the turbidity distribution in the lower sea. Further, if the laser beam is intensified, the fish and the like will be adversely affected.
【０００４】[0004]
【課題を解決するための手段】本発明の海中濁度分布測
定装置は、濁度分布を測定すべき位置の上方に配置した
レーザ反射光の受光手段と、この受光手段より水平方向
に離間した位置に配置したレーザ光を海底に向かって間
歇的に発射するレーザ光発射手段と、このレーザ光発射
手段から発射されるレーザ光の向きを少なくとも上記位
置の海底部分及びその上部に向かって次第に変えるため
の手段と、レーザ反射光の反射位置及びレベルを計測す
る計測手段とより成ることを特徴とする。According to the present invention, there is provided an underwater turbidity distribution measuring device, comprising: a laser reflected light receiving means disposed above a position where a turbidity distribution is to be measured; A laser light emitting unit that intermittently emits the laser light disposed at the position toward the sea floor, and gradually changes the direction of the laser light emitted from the laser light emitting unit toward at least the sea bottom portion at the above position and the upper part thereof Means for measuring the reflection position and level of the laser reflected light.
【０００５】本発明の海中濁度分布測定装置における上
記計測手段は、上記レーザ反射光の反射位置をそのレー
ザ光発射からレーザ反射光受光迄の時間を用いて測定す
る。The measuring means in the underwater turbidity distribution measuring apparatus of the present invention measures the reflection position of the laser reflected light using the time from emission of the laser light to reception of the laser reflected light.
【０００６】本発明の海中濁度分布測定装置における上
記計測手段は、上記レーザ反射光の反射位置をそのレー
ザ光の発射角を用いて測定する。The measuring means in the underwater turbidity distribution measuring device of the present invention measures the reflection position of the laser reflected light using the emission angle of the laser light.
【０００７】[0007]
【実施例】以下図面によって本発明の実施例を説明す
る。Embodiments of the present invention will be described below with reference to the drawings.
【０００８】本発明においては図１に示すようにレーザ
発振器１よりのレーザ光を発射するビームコリメータ２
を、濁度分布を測定すべき位置の上方に配置した上記ミ
ラー３から水平距離で例えば１ｍ離間して配置し、上記
ビームコリーメータ２によってレーザ光６を測定すべき
海の海底部分５ａに向かって斜めに単位時間毎に間歇的
に発射し、この海底部分からの反射光９を上記ミラー３
を介して検出器８によって検出せしめるようにすると共
に、ポリゴンミラー駆動モータ１０によって回転される
ポリゴンミラー１１によってビームコリメータ２から発
射されるレーザ光６の向きを水平方向に順次変化せしめ
レーザ光がミラー３とレンズ７とによる視野内を横切る
ように上記海底部分５ａ以外の海底部分５ｂから上記海
底部分５ａに、及びこの海底部分５ａの上方のミラー３
とレンズ７とによる視野内を横切るように海中に順次発
射せしめ、この際、上記ポリゴンミラー１１をスキャン
モータ２１によって水平方向と直角の方向に約３０°に
わたり偏向せしめ、同時にこのスキャンモータ２１と同
期してスキャンモータ４によりミラー３を同じく偏向せ
しめ海中の微粒子からの反射光２２を検出した検出器８
の出力をアンプ１２を介して増幅し、ピークホールド回
路１３によってそのピーク値を上記レーザ発振器１が次
のレーザ光６を発射する迄保持せしめ、このピーク値を
深度計測機構１４に加えるようにする。In the present invention, as shown in FIG. 1, a beam collimator 2 for emitting a laser beam from a laser oscillator 1
Is disposed at a horizontal distance of, for example, 1 m from the mirror 3 disposed above the position where the turbidity distribution is to be measured, and is directed toward the seabed portion 5a of the sea where the laser beam 6 is to be measured by the beam collimator 2. It is intermittently emitted at an interval of unit time, and the reflected light 9 from the seabed is reflected by the mirror 3
And the direction of the laser beam 6 emitted from the beam collimator 2 is sequentially changed in the horizontal direction by a polygon mirror 11 rotated by a polygon mirror driving motor 10 so that the laser beam is mirrored. 3 and a lens 7 so as to traverse the field of view from the seafloor portion 5b other than the seafloor portion 5a to the seafloor portion 5a and the mirror 3 above the seafloor portion 5a.
And the lens 7 are sequentially fired into the sea so as to cross the field of view. At this time, the polygon mirror 11 is deflected by a scan motor 21 in a direction perpendicular to the horizontal direction by about 30 °, and at the same time synchronized with the scan motor 21 Then, the mirror 3 is also deflected by the scan motor 4 to detect the reflected light 22 from fine particles in the sea.
Is amplified via an amplifier 12, and its peak value is held by a peak hold circuit 13 until the laser oscillator 1 emits the next laser beam 6, and this peak value is added to a depth measuring mechanism 14. .
【０００９】また、上記アンプ１２からの出力を時間−
電圧変換器１５に加え、レーザ光６が発射されてからそ
の反射光９が受光される迄の時間に相当する電圧を反射
光９が生ずる都度発生せしめ、この電圧値をホールド回
路１６によって次にレーザ光６が発射される迄保持せし
めると共に、この値を深度計測機構１４に加える。な
お、１７はポリゴンミラースタート位置センサーであ
る。The output from the amplifier 12 is time-dependent.
In addition to the voltage converter 15, a voltage corresponding to the time from the emission of the laser light 6 to the reception of the reflected light 9 is generated each time the reflected light 9 is generated. The laser beam 6 is held until it is emitted, and this value is added to the depth measurement mechanism 14. Reference numeral 17 denotes a polygon mirror start position sensor.
【００１０】本発明の海中濁度分布測定装置は上記のよ
うな構成であるから、レーザ光６の発射毎に海底部分か
らのレーザ反射光９を生ずるがミラー３の下方の海底部
分５ａ以外の海底部分５ｂからのレーザ反射光９は微弱
であるのに対し、上記海底部分５ａからのレーザ反射光
９はミラー３の真下からの反射光となるので十分大きな
値となり、上記海底部分５ａからのレーザ反射光９によ
る検出器８の出力はピーク状となり、またこのピークは
最初に現れる。Since the underwater turbidity distribution measuring apparatus of the present invention has the above-described configuration, every time the laser beam 6 is emitted, a laser reflected light 9 is generated from the bottom of the sea. The laser reflected light 9 from the seafloor portion 5b is weak, whereas the laser reflected light 9 from the seafloor portion 5a is reflected light from directly below the mirror 3 and therefore has a sufficiently large value. The output of the detector 8 due to the laser reflected light 9 becomes a peak, and this peak appears first.
【００１１】次いでレーザ光６は上記海底部分５ａの上
部の海中に発射されるからこの部分に濁りを形成する微
粒子があれば、この部分の濁度に応じた大きさの微粒子
からのレーザ反射光２２が検出器８によって検出される
ようになる。Next, since the laser beam 6 is emitted into the sea above the seabed portion 5a, if there is a fine particle which forms turbidity in this portion, the laser reflected light from the fine particle having a size corresponding to the turbidity of this portion. 22 will be detected by the detector 8.
【００１２】また、このような反射光９，２２を発生せ
しめたレーザ光６の発射時刻と反射光９，２２の受光時
刻の差は上記時間−電圧変換器１５によって計測でき、
これはレーザ光の往復時間に相当するから、上記ミラー
３とポリゴンミラー１１間の既知の水平距離と、海底部
分５ａと上記ミラー３間の鉛直距離及び海底部分５ａと
ポリゴンミラー１１間の距離が直角三角形を形成する関
係から上記深度計測機構１４によりレーザ反射光９，２
２を生じた位置の深度が計測できるようになる。The time-voltage converter 15 can measure the difference between the emission time of the laser light 6 that has generated such reflected lights 9 and 22 and the received time of the reflected lights 9 and 22.
Since this corresponds to the round trip time of the laser beam, the known horizontal distance between the mirror 3 and the polygon mirror 11, the vertical distance between the seabed portion 5a and the mirror 3, and the distance between the seabed portion 5a and the polygon mirror 11 are different. Due to the formation of a right-angled triangle, the laser reflected light 9, 2
The depth of the position where 2 occurs can be measured.
【００１３】図２は間歇的に発射されたレーザ光６と、
反射光９，２２によってピークホールド回路１３によっ
て保持された受信レベルと、海底部分５ａと、この部分
以外の海底部分５ｂと、ハッチングで示される海中の濁
り部分と、計測された深度の関係を示し、この図２から
明らかなように、深度６．７ｍの部分で検出出力の始め
のピークがあり、この部分が海底部分５ａであることが
判明する。また、このピークに続くレーザ反射光２２の
位置とレベルが海中の濁度分布を示すようになる。FIG. 2 shows a laser beam 6 emitted intermittently.
The relationship between the reception level held by the peak hold circuit 13 by the reflected lights 9 and 22, the sea bottom portion 5a, the sea bottom portion 5b other than this portion, the turbid portion in the sea indicated by hatching, and the measured depth is shown. As can be seen from FIG. 2, there is a first peak of the detection output at a portion at a depth of 6.7 m, and this portion is found to be the seafloor portion 5a. Further, the position and level of the laser reflected light 22 following this peak show the turbidity distribution in the sea.
【００１４】なお、図２において海底部分５ａを示すピ
ーク以外のピーク及びくぼみは魚群１８の存在によるも
のである。In FIG. 2, the peaks and dents other than the peak indicating the seafloor portion 5a are due to the presence of the school of fish 18.
【００１５】図３は、レーザ反射光９の反射位置を求め
る手段の他の実施例を示し、この実施例では図２におけ
る時間−電圧変換器１５及びホールド回路１６を用い
ず、代わりに上記ポリゴンミラー１１にエンコーダ１９
を設け、レーザ光６の発射の向きが鉛直方向となる場合
（角度０）に対する上記ポリゴンミラー１１の回転角度
をエンコーダ角度計２０によって計数せしめ、この計数
値を上記深度計測機構１４に加える。FIG. 3 shows another embodiment of the means for determining the reflection position of the laser reflected light 9. In this embodiment, the time-voltage converter 15 and the hold circuit 16 in FIG. Encoder 19 on mirror 11
The rotation angle of the polygon mirror 11 with respect to the case where the emission direction of the laser beam 6 is vertical (angle 0) is counted by the encoder goniometer 20, and the counted value is added to the depth measuring mechanism 14.
【００１６】この実施例によればレーザ反射光９，２２
を生ずるときのレーザ光６の発射角度を上記エンコーダ
角度計２０によって検知できるから、これによって上記
実施例と同様にして上記レーザ反射光９，２２の反射位
置を容易に計測することができる。According to this embodiment, the laser reflected lights 9, 22
Can be detected by the encoder goniometer 20 when the laser beam 6 is generated. Thus, the reflection positions of the laser reflected lights 9 and 22 can be easily measured in the same manner as in the above embodiment.
【００１７】図４は図３に示す海中濁度分布測定装置に
よる計測状態説明図である。FIG. 4 is an explanatory diagram of a measurement state by the underwater turbidity distribution measuring device shown in FIG.
【００１８】[0018]
【発明の効果】上記のように本発明の海中濁度分布測定
装置によれば、レーザ光を用いて海中の濁度分布を誤差
なく測定でき、魚類等の発見にも利用できる。即ち、図
２における魚のピークは被測定海域中に魚群１８が存
在することを意味し、魚のくぼみは他の海域に魚群１
８が存在することを示すようになる。As described above, according to the apparatus for measuring turbidity in the sea of the present invention, the turbidity distribution in the sea can be measured without error using laser light, and can be used for finding fish and the like. That is, the peak of the fish in FIG. 2 means that the school of fish 18 exists in the sea area to be measured, and the hollow of the fish is the school of fish 1 in the other sea area.
8 will now be present.
【００１９】また発射レーザ光の強さを減少できるた
め、魚類等に与える影響も少なくなる等大きな利益があ
る。Further, since the intensity of the emitted laser beam can be reduced, there is a great advantage that the influence on fish and the like is reduced.
【図１】本発明の海中濁度分布測定装置の説明図であ
る。FIG. 1 is an explanatory diagram of an underwater turbidity distribution measuring device of the present invention.
【図２】本発明の海中濁度分布測定装置による計測状態
説明図である。FIG. 2 is an explanatory diagram of a measurement state by the underwater turbidity distribution measuring device of the present invention.
【図３】本発明の海中濁度分布測定装置の説明図であ
る。FIG. 3 is an explanatory view of a submarine turbidity distribution measuring device of the present invention.
【図４】本発明の海中濁度分布測定装置による計測状態
説明図である。FIG. 4 is an explanatory diagram of a measurement state by the underwater turbidity distribution measuring device of the present invention.
【図５】従来の海中濁度分布測定装置の説明図である。FIG. 5 is an explanatory view of a conventional underwater turbidity distribution measuring device.
【図６】従来のレーザ光による海中濁度分布測定の説明
図である。FIG. 6 is an explanatory diagram of conventional measurement of turbidity distribution in the sea using laser light.
【図７】従来のレーザ光による海中濁度分布測定の説明
図である。FIG. 7 is an explanatory diagram of conventional measurement of turbidity distribution in the sea by laser light.
１ レーザ発振器 ２ ビームコリメータ ３ ミラー ４ スキャンモータ ５ 海底 ５ａ 被測定海底部分 ５ｂ 海底部分 ６ レーザ ７ レンズ ８ 検出器 ９ 海底からのレーザ反射光 １０ ポリゴンミラー駆動モータ １１ ポリゴンミラー １２ アンプ １３ ピークホールド回路 １４ 深度計測機構 １５ 時間−電圧変換器 １６ ホールド回路 １７ ポリゴンミラースタート位置センサー １８ 魚群 １９ エンコーダ ２０ エンコーダ角度計 ２１ スキャンモータ ２２ 微粒子からのレーザ反射光 REFERENCE SIGNS LIST 1 laser oscillator 2 beam collimator 3 mirror 4 scan motor 5 seabed 5 a seafloor part to be measured 5 b seafloor part 6 laser 7 lens 8 detector 9 laser reflected light from seafloor 10 polygon mirror drive motor 11 polygon mirror 12 amplifier 13 peak hold circuit 14 Depth measuring mechanism 15 Time-voltage converter 16 Hold circuit 17 Polygon mirror start position sensor 18 Fish school 19 Encoder 20 Encoder goniometer 21 Scan motor 22 Laser reflected light from fine particles
Claims (3)
したレーザ反射光の受光手段と、この受光手段より水平
方向に離間した位置に配置したレーザ光を海底に向かっ
て間歇的に発射するレーザ光発射手段と、このレーザ光
発射手段から発射されるレーザ光の向きを少なくとも上
記位置の海底部分及びその上部に向かって次第に変える
ための手段と、レーザ反射光の反射位置及びレベルを計
測する計測手段とより成ることを特徴とする海中濁度分
布測定装置。1. A means for receiving laser reflected light disposed above a position where turbidity distribution is to be measured, and intermittently emitting laser light disposed at a position horizontally separated from the light receiving means toward the sea floor. Laser light emitting means, a means for gradually changing the direction of laser light emitted from the laser light emitting means toward at least the seabed portion at the above position and above, and measuring the reflection position and level of the laser reflected light A turbidity distribution measuring apparatus in sea, comprising:
射位置をそのレーザ光発射からレーザ反射光受光迄の時
間を用いて測定する請求項１記載の海中濁度分布測定装
置。2. The underwater turbidity distribution measuring apparatus according to claim 1, wherein the measuring means measures the reflection position of the laser reflected light using a time from emission of the laser light to reception of the laser reflected light.
射位置をそのレーザ光の発射角を用いて測定する請求項
１記載の海中濁度分布測定装置。3. An underwater turbidity distribution measuring apparatus according to claim 1, wherein said measuring means measures a reflection position of said laser reflected light using an emission angle of said laser light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33382092A JP2660788B2 (en) | 1992-11-20 | 1992-11-20 | Underwater turbidity distribution measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33382092A JP2660788B2 (en) | 1992-11-20 | 1992-11-20 | Underwater turbidity distribution measurement device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06160279A JPH06160279A (en) | 1994-06-07 |
| JP2660788B2 true JP2660788B2 (en) | 1997-10-08 |
Family
ID=18270315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33382092A Expired - Fee Related JP2660788B2 (en) | 1992-11-20 | 1992-11-20 | Underwater turbidity distribution measurement device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2660788B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8488122B2 (en) | 2010-05-05 | 2013-07-16 | Ysi Incorporated | Turbidity sensors and probes |
-
1992
- 1992-11-20 JP JP33382092A patent/JP2660788B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06160279A (en) | 1994-06-07 |
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