An object of the present invention, insertion amount, and / or to reduce the error in the detection of rotational amount, and the insertion portion in the processing and to provide a new member does not require the insertion of detector and detection system additional It is. Insertion amount detecting device and the insertion amount detection system receives a light source unit for emitting a source light toward the outer circumferential surface of the cylindrical insertion portion to be detected and inserted into the insert, the light reflected from the outer peripheral surface a predetermined plurality of image data in the range of the outer peripheral surface including any optical pattern, and an optical pattern detecting unit sequentially acquires such that at least a portion of the optical pattern matches, the optical pattern that matches the plurality of image data The detected, and a, a displacement amount calculation unit for calculating at least one of the rotation amount about the central axis of the insertion amount and the cylindrical shape of the insertion portion. For this, the insertion amount of the detection apparatus and the detection system, insertion amount, and / or to reduce the error in the detection of rotational amount, and does not require processing and addition of a new member into the insertion portion.本発明の目的は、挿入量、及び/又は、回転量の検出の誤差を低減し、且つ挿入部に加工や新たな部材の追加を必要としない挿入量の検出装置及び検出システムを提供することである。挿入量検出装置及び挿入量検出システムは、被挿入体に挿入し検出対象となる挿入部の円筒形状の外周面に向けて光源光を射出する光源部と、外周面からの反射光を受光し、任意の光学パターンを含む外周面の所定の範囲の複数の画像データを、少なくとも一部の光学パターンが一致するように順次取得する光学パターン検出部と、複数の画像データから一致する光学パターンを検出し、挿入部の挿入量と円筒形状の中心軸周りの回転量との少なくとも一方を算出する変位量演算部と、を有している。このために、挿入量の検出装置及び検出システムは、挿入量、及び/又は、回転量の検出の誤差を低減し、且つ挿入部に加工や新たな部材の追加を必要しない。
