发明名称 |
LIQUID CRYSTAL DEVICE FOR CALIBRATION AND TESTING OF OPTICAL INSTRUMENTS |
摘要 |
A device and method for optical calibration of an optical instrument that measures optical characteristics along an optical path. A controllable shutter having electrically alterable optical characteristics is placed across the optical path of the instrument. An electrical control is connected to the shutter for selectively providing a variable voltage to the shutter to electrically alter optical characteristics of the shutter in a controlled manner so that the optical characteristics of the shutter correspond to selected optical characteristics. |
申请公布号 |
ZA9009530(B) |
申请公布日期 |
1991.11.27 |
申请号 |
ZA19900009530 |
申请日期 |
1990.11.27 |
申请人 |
AKZO N.V. |
发明人 |
CHARLES HERMAS SWOPE;JOHN GLENN LINK;DOUGLAS GLENN HAUGEN |
分类号 |
G01J1/00;G01M11/00;G01N21/27;G01N21/59;G02F1/13 |
主分类号 |
G01J1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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