| 摘要 |
PURPOSE:To enable measurements at plural measuring points simultaneously by a method wherein an intersecting point of straight lines drawn from the plural number of measuring points standing in a straight line and straight lines drawn from image forming points formed by an image formation lens is placed on a straight line passing through the main plane of the image formation lens. CONSTITUTION:The intersecting point of straight lines drawn from measuring points A, B, C on the plural number of laser irradiation axes A, B, C standing in a line and straight lines drawn from image forming points A', B', C' formed by an image formation lens L is placed at a point O on the straight line passing through the main plane of the image formation lens, which effects are Bragg condition. As a result, image points A', B', C' of the measuring points A, B, C are formed on a straight line which is not parallel with the luminous axis of the image formation lens L. Therefore, if an optical fiber F is provided with each of the image points A', B', C', the 3 fibers F allow light information to be simultaneously led to the incident slit of a spectrometer. In addition, if the fibers F are each allotted to the image formation positions A', A1', A2' corresponding to the measured points A, B, C, A1, B1, C1, A2, B2, C2, any cross sections can be measured. |
