公开(公告)号：US4679933A

公开(公告)日：1987-07-14

申请号：US397921

申请日：1983-02-28

Applicant: Jerzy T. Pindera

Inventor： Jerzy T. Pindera

IPC: G01L1/24 ,  G01N21/23 ,  G01N21/47 ,  G01B11/18

CPC classification number: G01N21/23 ,  G01L1/241 ,  G01N21/47

Abstract: A new method and device has been developed to determine experimentally the state and amount of birefringence along any arbitrary direction through a birefringent body. Such information can be used to determine the optical anisotropy of solid and liquid bodies, the residual and induced stress fields, etc. Essentially, this method and device separates, from the light scattered in all directions along an arbitrary path of laser light in a body, three sheets of light which are subsequently collimated; each of these light sheets contains parallel light rays carrying information of interest. The middle light sheet indicates the line of measurements, which is identical with the path or position of laser beam in a body. The two outer light sheets carry two complementary and independent pieces of information on the state and amount of birefringence along the line of measurements. Thus, both outer sheets of light can be used simultaneously to increase the reliability and accuracy of the birefringence measurements.

Abstract translation: 已经开发了一种新的方法和装置，用于通过双折射体实验地确定沿着任意方向的双折射的状态和量。 这种信息可用于确定固体和液体的光学各向异性，残余和诱导应力场等。本质上，该方法和装置与在体内的任意的激光路径沿着各个方向散射的光分离 随后准备三张光; 这些光片中的每一个包含携带感兴趣的信息的平行光线。 中间的光照片表示测量线，其与激光束在体内的路径或位置相同。 两个外部光照片沿着测量线携带两个互补和独立的双折射状态和数量信息。 因此，可以同时使用两个外部光片来提高双折射测量的可靠性和精度。

公开(公告)号：US4703918A

公开(公告)日：1987-11-03

申请号：US397922

申请日：1982-07-12

Applicant: Jerzy T. Pindera

Inventor： Jerzy T. Pindera

IPC: G01L1/24 ,  G01N21/21

CPC classification number: G01L1/241

Abstract: An apparatus has been developed to experimentally determine the state and amount of birefringence in an arbitrary plane within a birefringent body using an entirely new method. Such information can be used to determine the optical anisotropy in solid and liquid bodies, residual and induced stress fields, etc. This apparatus uses a collimated and polarized light beam which scans linearly the plane of measurement within a transparent birefringent or photoelastic object, and a device which collects particular sheets of light scattered along the path of the light beam, the intensity of which is directly related to the state of birefringence at each scattering point at the plane of measurement within the birefringent body. An imaging device produces in the image plane of the apparatus the lines of constant light intensities which are the lines of constant values of accumulated birefringence. For plane stress states in engineering objects such lines are identical with the elastic isodynes and are therefore called photoelastic isodynes. Two independent fields of such isodynes allow the direct determination of all three stress components of the plane stress state and give an additional relation between the strees components. This is the only experimental method which supplies directly four or more independent data on the stress state at each point within the photoelastic object.

Abstract translation: 已经开发了一种使用全新方法来实验地确定双折射体内的任意平面中双折射的状态和量的装置。 这种信息可以用于确定固体和液体中的光学各向异性，残余和诱导应力场等。该装置使用准直和偏振光束，其在透明双折射或光弹性物体内线性扫描测量平面，并且 收集沿着光束路径散射的特定光束的装置，其强度与双折射体内的测量平面处的每个散射点处的双折射状态直接相关。 成像装置在装置的图像平面中产生作为累积双折射的常数值线的恒定光强度的线。 对于工程物体中的平面应力状态，这些线与弹性体相同，因此称为光弹性体。 这种等离子体的两个独立领域允许直接确定平面应力状态的所有三个应力分量，并给出部分分量之间的附加关系。 这是唯一的实验方法，它可以在光弹性物体内的每一点直接提供四个或更多个独立的应力状态数据。