Finesse Solutions, Inc.

Hewlett-packard Development Company, L.P.

John Havard

David J Arcaro

Miquel Boleda

Alfred Riddle

Paul C Williams

A method for compensating for changes in output power or wavelength of an optical source with temperature. Many optical sources have power and/or wavelength variations with temperature which can be compensated by open- or closed-loop methods if a method of accurately measuring the optical source temperature is available. The voltage across a semiconductor junction varies with temperature. Measuring the optical source power or wavelength variation with temperature and tracking the voltage across the semiconductor junction provides a means for compensating an instrument for temperature induced optical output power or wavelength variations. An important field of application is optical density or turbidity measurements in cellular media.

System and method for laser temperature compensation

A circularizated semiconductor laser diode (CSLD), such as for example a vertical cavity surface emitting laser (VCSEL) may be used for optical measurements. The CSLD may be used in a cell density probe to perform cell density determination and/or turbidity determination, such as in a biotech, fermentation, or other optical absorbance application. The cell density probe may comprise a probe tip section made from a polytetrafluoroethylene material, which provides sealability, ease of manufacture, durability, cleanability, optical semi-transparency at visible and near infrared wavelengths, and other advantages. The probe tip advantageously provides an optical gap that allows for in situ measurements of optical measurements including but not limited to absorbance, scattering, and fluorescence.

Systems and methods for in situ spectroscopic measurements

Method and apparatus for thermal transfer overcoat technology. Throughput conditions are anticipated. Multi-stage preheating of the fuser is performed such that active heating during thermal transfer overcoat is eliminated. Thermal waves create an accumulated fuser heat that is a sufficient energy to maintain a substantially constant fuser temperature needed for one whole thermal transfer overcoat cycle.

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Seattle, WA, United States of America

John Havard