公开(公告)号：US3680965A

公开(公告)日：1972-08-01

申请号：US3680965D

申请日：1970-12-10

Applicant: US ARMY

Inventor： DILWORTH JAMES B ,  CROW THOMAS G

IPC: G01J1/42 ,  G01J1/48 ,  G01J1/40 ,  G01J1/00 ,  G01N21/06

CPC classification number: G01J1/48 ,  G01J1/4257

Abstract: Energy distribution within a laser beam is measured and a sample of the intensity is obtained, providing a self-calibrated photograph on a single film sample. A burst of laser energy striking a wedge plate or prism within the beamspread measurement camera is divided into multiple reflections within the prism. Each reflection is at a slightly greater angle than the preceeding one and is attenuated with respect thereto. Each reflection is collected by a lens and focused onto a spectrographic plate located at the lens focal point. The diameter of each image on the film is the product of the lens focal length and beamspread. The distribution pattern of each reflected sample is recorded on the same plate and can be compared with preceeding samples, each sample being a known percentage of the preceeding waves. Relative energy as a function of beamspread is determined by measuring the energy density of each image with a densitometer. Any point on each image of reflected energy is a known percentage of that point on the other images and provides a standard for determining the contour ring for a particular energy density on the initial spot, thus providing a contour map of the main beam.

Abstract translation: 测量激光束内的能量分布，获得强度样本，在单个薄膜样品上提供自校准照片。 在波束测量相机内的一束激光能量撞击楔形板或棱镜，在棱镜内被分成多个反射。 每个反射比之前的角度稍大一点，并且相对于它们衰减。 每个反射由透镜收集并聚焦到位于透镜焦点处的光谱板上。 胶片上的每个图像的直径是透镜焦距和光束扩展的乘积。 每个反射样品的分布图案记录在同一个板上，可以与先前的样品进行比较，每个样品是先前波的已知百分比。 通过用密度计测量每个图像的能量密度来确定作为光束扩展的函数的相对能量。 反射能量的每个图像上的任何点是其他图像上该点的已知百分比，并且为初始点上的特定能量密度确定轮廓环的标准，从而提供主波束的等高线图。