DISTANCE MEASURING DEVICE

• Main Authors: OSHIMA SHINICHI, ISEI YOSHIHITO, HONDA TATSURO
• Format: Patent
• Language: English; Japanese
• Published: 16.05.2016
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; GYROSCOPIC INSTRUMENTS; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING DISTANCES, LEVELS OR BEARINGS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; NAVIGATION; PHOTOGRAMMETRY OR VIDEOGRAMMETRY; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; SURVEYING; TESTING

PROBLEM TO BE SOLVED: To provide a distance measuring device capable of accurately measuring a distance up to an object to be measured even when applied under adverse environment such as a manufacturing site of a steel product.SOLUTION: A distance measuring device 100 according to the present invention includes: a distance measuring device main body 1 having a FSF laser light source 11, a light receiving element 12, a first reflection source R1 for reflecting a reference light, and distance calculation means 13; a measurement head 2 placed opposite to the surface of an object to be measured M and having a second reflection source R2 for reflecting laser light inside therein as a return light; and an optical fiber 3 for connecting the distance measurement device main body to the measurement head. The distance calculation means calculates a first distance L1 on the basis of the difference between the frequency of the measurement light reflected on the surface of the object to measured and the frequency of the reference light, and a second distance L2 on the basis of a difference between the frequency of the return light and the frequency of the reference light. A distance from the second reflection source R2 to the surface of the object to be measured is calculated by calculating the difference between the first distance L1 and the second distance L2.SELECTED DRAWING: Figure 1 【課題】鉄鋼製品の製造現場のような悪環境下で適用したとしても、精度良く被測定対象までの距離を測定することが可能な距離測定装置を提供する。【解決手段】本発明に係る距離測定装置１００は、ＦＳＦレーザ光源１１、受光素子１２、参照光を反射するための第１の反射源Ｒ１及び距離演算手段１３を具備する距離測定装置本体１と、被測定対象Ｍの表面に対向配置され、内部にレーザ光を戻り光として反射するための第２の反射源Ｒ２を具備する測定ヘッド２と、距離測定装置本体と測定ヘッドとを連結する光ファイバー３とを備える。距離演算手段は、被測定対象の表面で反射した測定光の周波数と参照光の周波数との差に基づき第１の距離Ｌ１を演算し、戻り光の周波数と参照光の周波数との差に基づき第２の距離Ｌ２を演算し、第１の距離Ｌ１と第２の距離Ｌ２との差を演算することで、第２の反射源Ｒ２から被測定対象の表面までの距離を算出する。【選択図】図１