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US 10,379,043 B2Granted
Measuring path delay through a liquid-crystal variable retarder at non-uniform retardance intervals
AssigneePalo Alto Research Center Incorporated
InventorAlex Hegyi
Life of this patent
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Abstract
A voltage is applied to a liquid-crystal variable retarder that monotonically changes a retardance and changes a first derivative with respect to time of the retardance of the liquid-crystal variable retarder over a time period. An interferogram of light passing through the liquid-crystal variable retarder is measured during the time period.
Claims20
A method comprising:
- applying a voltage to a liquid-crystal variable retarder that monotonically changes a retardance and changes a first derivative with respect to time of the retardance of the liquid-crystal variable retarder over a time period;
- and
- measuring an interferogram of light passing through the liquid-crystal variable retarder during the time period.
A method, comprising:
- applying a voltage to a liquid-crystal variable retarder that monotonically changes a retardance of the liquid-crystal variable retarder over a time period;
- and
- sampling an interferogram of light passing through the liquid-crystal variable retarder at non-uniform intervals of retardance during the time period.
An apparatus comprising:
- a polarization interferometer comprising a liquid-crystal variable retarder;
- and
- a controller coupled to the liquid-crystal variable retarder, the controller operable to:
- apply a voltage to the liquid-crystal variable retarder that monotonically changes a retardance and changes a first derivative with respect to time of the retardance of the liquid-crystal variable retarder over a time period;
- and
- measure an interferogram of light passing through the liquid-crystal variable retarder during the time period.
3 more elements
Dependencies are inferred from the claim text.