System and method for focal length stabilization using...

Optical: systems and elements – Lens – With support

Reexamination Certificate

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C353S101000, C353S122000, C374S121000, C250S2140LS, C250S338100, C219S121670

Reexamination Certificate

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07602563

ABSTRACT:
An optical metrological system having a heat-generating light source coaxially mounted near a heat-sensitive lens. The system uses a temperature sensor to monitor the lens temperature and a heating element to heat the lens such that the lens operating temperature is greater than a maximum operating temperature of the light source in order to stabilize the focal length of the lens.

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