Dual field-of-view objects system for the infrared
This invention relates to optical systems and in particular to an athermalised dual field-of-view objective optical system capable of operating in the 3-5 micron thermal infra-red waveband and which is light in weight. A dual field-of-view objective system () which is inexpensive, has high transmiss...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | This invention relates to optical systems and in particular to an athermalised dual field-of-view objective optical system capable of operating in the 3-5 micron thermal infra-red waveband and which is light in weight.
A dual field-of-view objective system () which is inexpensive, has high transmission and is essentially achromatized and athermalized. The system () uses a silicon front lens A and all lens elements have positive temperature/refractive index change coefficient. |
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