摘要:

A photoelectric device has been developed with which it is possible to measure automatically the relative times of exposure of a photo‐cell placed in the path of a moving beam of light. When the photo‐cell is illuminated, a relay is energized which closes contacts for an electrical stop watch. Accordingly, this clock runs only when the beam of light is projected upon the photoelectric cell. By adjusting the position of this cell upon a graduated upright or within a predetermined area, it is possible to determine by the stop watch reading the time of the photo‐cell exposure to the illumination at a given location. Frequency distribution curves obtained in this manner were analyzed and have been found valuable in the analyses of filamentous materials such as textile yarns.

ISSN:0034-6748    

DOI:10.1063/1.1752052

出版商:AIP    

年代:1936

数据来源: AIP

摘要:

When the barrier‐layer photoelectric cell is used in measuring the intensity of polarized light, errors may arise which depend upon the direction of the electric vector with respect to the plane of incidence. Curves are given which show that these errors may amount to as much as 30 percent.

ISSN:0034-6748    

DOI:10.1063/1.1752053

出版商:AIP    

年代:1936

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752054

出版商:AIP    

年代:1936

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752056

出版商:AIP    

年代:1936

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752057

出版商:AIP    

年代:1936

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752058

出版商:AIP    

年代:1936

数据来源: AIP