发明名称 |
Inspection device and method thereof |
摘要 |
An optical system configured to visually inspect a target having a variable position with respect to the optical system is provided. The optical system includes a polarizer configured to convert an incident light reflected or diffused from the target into linearly polarized light; a light modulating element configured to modulate a polarization state of the linearly polarized light in response to control signals; and a lens group comprising at least one birefringent element, the birefringent element configured to refract or reflect the modulated linearly polarized light with a first polarization state under a first refraction index to enable inspection of the target at a first object position, and the birefringent element further configured to refract or reflect the modulated linearly polarized light with a second polarization state under a second refraction index to enable inspection of the target at a second object position. |
申请公布号 |
US9188543(B2) |
申请公布日期 |
2015.11.17 |
申请号 |
US201213448691 |
申请日期 |
2012.04.17 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
Li Tao;Song Guiju;Harding Kevin George;Yang Dongmin;Zhai Zirong;Han Jie;Abramovich Gil |
分类号 |
G01N21/88;G02B26/00;G02B27/28;G01N21/21 |
主分类号 |
G01N21/88 |
代理机构 |
GE Global Patent Operation |
代理人 |
GE Global Patent Operation |
主权项 |
1. An optical system configured to visually inspect a target, the target comprising variable positions with respect to the optical system, the optical system comprising:
a polarizer configured to convert an incident light reflected or diffused from the target into linearly polarized light; a light modulating element configured to modulate a polarization state of the linearly polarized light in response to control signals; a lens assembly comprising at least one birefringent element, the birefringent element configured to refract the modulated linearly polarized light with a first polarization state under a first refraction index to enable inspection of the target at a first object position with respect to the optical system, and the at least one birefringent element further configured to refract the modulated linearly polarized light with a second polarization state under a second refraction index to enable inspection of the target at a second object position with respect to the optical system; a detector configured to detect a position of the target with respect to the optical system, the detector further configured to provide positional signals used for automatically switching the optical system between a first inspection mode and a second inspection mode, wherein in the first inspection mode, the target at a first position with respect to the optical system is inspected; and wherein in the second inspection mode, the target at a second position with respect to the optical system is inspected. |
地址 |
Schenectady NY US |