公开(公告)号：US09726474B2

公开(公告)日：2017-08-08

申请号：US15104952

申请日：2014-10-15

申请人： UNIVERSITAT POLITÈCNICA DE CATALUNYA

发明人： Santiago Royo Royo ,  Francisco Javier Azcona Guerro ,  Ajit Jha

IPC分类号： G01B9/02 ,  G01S17/32 ,  G01S17/58 ,  G01B11/02 ,  G01S7/491

CPC分类号： G01B9/02092 ,  G01B9/02004 ,  G01B9/0207 ,  G01B11/026 ,  G01S7/4916 ,  G01S17/32 ,  G01S17/58

摘要： A method and system to implement the method of measuring a change in an optical path length using differential laser self-mixing interferometry. The method includes obtaining a reference SMI signal (Sr) and a main measurement SMI signal (Sm) of a laser (LD) and determining the relative change in the optical path length between the (LD) and a target (T) in a range between 0 and λ/2, by comparing the relative positions along time of fringes or transitions of the (Sm) and (Sr). The (Sr) and the (Sm) are obtained at different moments once backscattered laser light (br) is generated from the reflection on said target (T) of a reference and a main measurement laser light beam emitted by the laser (LD) and while being modulated according to a specific modulation pattern that maintained while both the (Sr) and the (Sm) are acquired and has re-entered its laser cavity.

公开(公告)号：US20160320173A1

公开(公告)日：2016-11-03

申请号：US15104952

申请日：2014-10-15

申请人： UNIVERSITAT POLITÈCNICA DE CATALUNYA

发明人： Santiago Royo Royo ,  Francisco Javier Azcona Guerro ,  Ajit Jha

IPC分类号： G01B9/02 ,  G01B11/02

CPC分类号： G01B9/02092 ,  G01B9/02004 ,  G01B9/0207 ,  G01B11/026 ,  G01S7/4916 ,  G01S17/32 ,  G01S17/58

摘要： A method and system to implement the method of measuring a change in an optical path length using differential laser self-mixing interferometry. The method includes obtaining a reference SMI signal (Sr) and a main measurement SMI signal (Sm) of a laser (LD) and determining the relative change in the optical path length between the (LD) and a target (T) in a range between 0 and λ/2, by comparing the relative positions along time of fringes or transitions of the (Sm) and (Sr). The (Sr) and the (Sm) are obtained at different moments once backscattered laser light (br) is generated from the reflection on said target (T) of a reference and a main measurement laser light beam emitted by the laser (LD) and while being modulated according to a specific modulation pattern that maintained while both the (Sr) and the (Sm) are acquired and has re-entered its laser cavity.

摘要翻译： 使用差分激光自混合干涉法来实现测量光路长度变化的方法和系统。 该方法包括获得激光（LD）的参考SMI信号（Sr）和主测量SMI信号（Sm），并确定在（LD）和目标（T）之间的光程长度的相对变化范围 在0和λ/ 2之间，通过比较（Sm）和（Sr）的条纹或转变时间的相对位置。 在不同的时刻获得（Sr）和（Sm），一旦从基准的所述目标（T）上的反射和由激光（LD）发射的主测量激光束产生反向散射激光（br），并且 同时根据在（Sr）和（Sm）两者中获得并且已经重新进入其激光腔的特定调制图案进行调制。