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3D リモート計測システム　OCM-A

周波数シフト帰還型レーザを用いた計測システム

3Dイノベーションはコア技術「周波数シフト帰還型レーザを使用した光距離計測技術」を応用した新しい計測システムを提供します。

3Dイノベーションの技術は、高精度(1σで50μｍ以下)、かつ高速(1000点／秒)な距離計測を可能とします。
専門機関による校正により、非常に高いリニアリティを有するという評価を得ており、優れた性能を生かした、幅広い計測応用があります。

光遠隔三次元計測システム　ＯＣＭ－Ａ

「OCM-A」は「高精度・高速」な距離計測技術を応用したレーザーレーダー方式による三次元計測システム
製造分野、土木計測分野などの幅広い計測分野に対して柔軟に対応します。

○製造分野 ：ラピッドプロトタイピング、リバースエンジニアリング、インライン検査
○土木計測分野 ：構造物の測距、震動計測、ヘルスモニタリング
○その他の分野 ：接触・接近が困難なターゲットの計測、デジタルアーカイビングなど

 

OCM-A is an optical distance measurement system using frequency-shifted feedback laser (FSFL).*

By acquiring high-speed, high-precision point cloud data, 3-dimensional and medium/long distance measurements are realized.
*FSFL is a result of collaborative research between Tohoku University and KODEN Electronics CO., Ltd.

Operating principle

In the laser resonator of FSFL, frequency modulated comb is generated with excellent linearity by constant frequency shift

 

Resonator configuration of FSFL

The optical wave emitted from the gain medium at ν0 is shifted by νs of the shifter frequency and fed back.


 

Frequency-domain ranging

 

By combining the reflected light from the
target and the reference, a beat signal proportional to the distance to the target can be obtained light using a chirped light.

 

Frequency chirped comb output

Frequency-chirped light is characterized by resonator circulation time τ_RT and shifter frequency νS. The chirped mode structure is called a comb and is represented by the number q.

　　　　

 Optical Frequency


 

Distance measurement by FSFL

 

The figure shows how the beat frequency changes when the target distance is changed from 1364 mm to 1546 mm. Higher order beat frequencies can also be observed.

Measurement example of OCM-A

Laser beam scans an object surface such as a product or mockup to acquire highly accurate three-dimensional coordinate data (point group). An inspection result can be immediately obtained by comparing the measured data with the 3D CAD data.
 

Product inspection

A door hole locations as In-line Inspection

Large items with complex shapes

Measurement of intricate and complicated shapes is also possible with large parts such
as engine blocks and transmission cases. With a large work area, collective measurement within the line of sight is possible. Therefore, the synthesis error is suppressed, and a high- reliability high-quality point cloud is obtained.

 

High temperature sample

Measurement in an electric furnace

 

Objects at 1,200 C are shining as dazzling eyes, but OCM-A can be obtained 3D data remotely with high accuracy. It is powerful as a measuring tool for material research, life test, forging press, and so on.


 

Field of civil engineering and architecture

Structures located in middle and long distances, which are difficult to approach, can accurately measure distance and dynamic displacement (such as resonant frequency and deflection of a bridge) by OCM-A using prisms. Remote measurement makes scaffolds unnecessary, and can reduce costs. Long-term measurement such as health monitoring of large structures is economically realized.