公开(公告)号：EP0260420B1

公开(公告)日：1991-05-29

申请号：EP87111115.9

申请日：1987-07-31

申请人： International Business Machines Corporation

发明人： Block, Timothy Roy ,  Enstrom, Mark Richard ,  Luecke, Francis Stephen ,  Shidler, Karl Allen ,  Soderstrom, Ronald Lee

IPC分类号： G11B5/55 ,  G11B21/08

CPC分类号： G11B5/5526

公开(公告)号：EP0260420A3

公开(公告)日：1988-11-30

申请号：EP87111115

申请日：1987-07-31

申请人： International Business Machines Corporation

发明人： Block, Timothy Roy ,  Enstrom, Mark Richard ,  Luecke, Francis Stephen ,  Shidler, Karl Allen ,  Soderstrom, Ronald Lee

IPC分类号： G11B05/55 ,  G11B21/08

CPC分类号： G11B5/5526

摘要： In this system the light reflected back over the path (10a) to be measured is fed directly into a semiconductor laser (8a). As is commonly known, the introduction of reflected power through the front, or emitting, facet of the laser actually alters the power present in the laser with an attendant effect on the signal from a photosensor (15) usually located on the rear facet of the laser. The output signal from the photosensor associated with the laser has an asymmetric sawtooth (triangular) waveform. This is in contrast to the output signal from a conventional interferometer which has a sinusoidal waveform. The photosensor output signal is profoundly affected by the return beam. Also unexpectedly, the sawtooth output signal from the photosensor is an essentially linear signal over the range between adjacent fringes. That is, except for the transition at positive and negative peaks. As the path length (10a) of the reflected beam is increased or decreased, the sawtooth output signal changes in a direct linear relationship to the change in path length. This allows precise measurement of changes in distance less than the distance between adjacent fringes.

公开(公告)号：EP0260420A2

公开(公告)日：1988-03-23

申请号：EP87111115.9

申请日：1987-07-31

申请人： International Business Machines Corporation

发明人： Block, Timothy Roy ,  Enstrom, Mark Richard ,  Luecke, Francis Stephen ,  Shidler, Karl Allen ,  Soderstrom, Ronald Lee

IPC分类号： G11B5/55 ,  G11B21/08

CPC分类号： G11B5/5526

摘要： In this system the light reflected back over the path (10a) to be measured is fed directly into a semiconductor laser (8a). As is commonly known, the introduction of reflected power through the front, or emitting, facet of the laser actually alters the power present in the laser with an attendant effect on the signal from a photosensor (15) usually located on the rear facet of the laser. The output signal from the photosensor associated with the laser has an asymmetric sawtooth (triangular) waveform. This is in contrast to the output signal from a conventional interferometer which has a sinusoidal waveform.
The photosensor output signal is profoundly affected by the return beam. Also unexpectedly, the sawtooth output signal from the photosensor is an essentially linear signal over the range between adjacent fringes. That is, except for the transition at positive and negative peaks. As the path length (10a) of the reflected beam is increased or decreased, the sawtooth output signal changes in a direct linear relationship to the change in path length. This allows precise measurement of changes in distance less than the distance between adjacent fringes.

摘要翻译： 在该系统中，将被测量的路径（10a）反射回的光被直接馈送到半导体激光器（8a）中。 众所周知，通过激光器的前面或发射面引入反射光，实际上改变了激光器中存在的功率，对来自光电传感器（15）的信号具有附加的作用，通常位于激光器的后面 激光。 来自与激光器相关联的光电传感器的输出信号具有不对称的锯齿波（三角波形）波形。 这与来自具有正弦波形的常规干涉仪的输出信号相反。 光电传感器输出信号受到返回光束的深刻影响。 也令人惊讶的是，来自光电传感器的锯齿波输出信号是相邻条纹之间的范围上的基本线性信号。 也就是说，除了在正和负峰值的过渡之外。 当反射光束的路径长度（10a）增加或减小时，锯齿波输出信号与路径长度的变化呈直线关系。 这允许精确测量距离小于相邻条纹之间的距离的变化。