发明名称 |
Radiation interference devices |
摘要 |
An interference device for discriminating between radiation sources of differing coherence length comprises means to divide received radiation from a source into two components. A path difference, defining a coherence length cut-off, is introduced into the path of one component and the components are brought together for interference. The recombined light passes through a reticle with alternate opaque and tranparent bars and an optical band-pass filter to a detector. Interference fringes present in the plane of the reticle are swept across the reticle by the action of the collection optical system of the device which includes a scanning rotating mirror. Two similar devices can be arranged for band-pass coherence length filtering and when used in conjunction with a light soruce whose coherence is modulated the device can be used for signalling.
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申请公布号 |
US4722604(A) |
申请公布日期 |
1988.02.02 |
申请号 |
US19830461203 |
申请日期 |
1983.01.20 |
申请人 |
THE SECRETARY OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTY'S GOVERNMENT OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND |
发明人 |
FRENCH, HERBERT A.;SUTTON, PHILIP |
分类号 |
G01J3/45;G01J9/02;(IPC1-7):G01B9/02;H04B9/00 |
主分类号 |
G01J3/45 |
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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