United Technologies Corporation

Other

Carl J Buczek

Peter P Chenausky

Robert J Wayne

John Wallace Matthews

Jackie R See

Anthony N Martin

Robert J Mongeon

Lanny M Laughman

Robert J Freiberg

David W Fradin

A device and methods for the real-time monitoring of stem cells in a stem cell transplant. The device comprises a linear member and particle detection device configured to occupy the lumen of a catheter while the catheter is in place to administer a stem cell transplant to a delivery site in the body of a patient. Monitoring of the stem cells permits the device to provide signals to a computer processor for the determination of one or more characteristics of stem cells in the stem cell transplant.

Device and methods for monitoring the administration of a stem cell transplant

An improved electrode configuration and method for the deposition of electrical power into an electric discharge laser having a gas path transversely disposed to an optical axis and the electric field is disclosed. The electrode configuration includes a cathode, having one or more common geometry rod elements of a thoriated material disposed transverse to a gas path and a planar anode disposed opposite the cathode in a parallel relationship thereto wherein the cathode and the anode define the gas path therebetween. The electrode configuration is adapted for operation without ballast resistance in the electrical circuit and without the utilization of preionization means. The electrode configuration provides a discharge having substantially diffuse and uniform characteristics within the discharge region.

Apparatus and method for deposition of electrical power in an electric

A closed cycle chemical laser adapted for continuous wave operation is disclosed. A first gas such as sulphur hexafluoride is decomposed by an electrical discharge means to provide at least some fluorine atoms which when combined with molecular hydrogen in a mixing chamber located upstream of and proximate to an optical power extraction chamber forms an excited laser species capable of stimulated emission to produce a continuous wave output beam. After passing through the optical cavity the effluent is purified by selective absorption and adsorption processes to eliminate the laser species from the effluent and to separate the hydrogen for recirculation back to the mixing chamber. The remaining effluent has its pressure increased, is supplemented with makeup feed gases and is recycled. The operation of the system using sulphur hexafluoride and hydrogen gases is discussed in detail and various combinations of other suitable reactants are disclosed.

Closed cycle chemical laser

A method for cavity dumping a Q-switched laser having a gaseous gain medium to obtain submicrosecond output pulses, typically controllably variable between ten and three hundred nanoseconds at a high pulse repetition frequency typically up to at least twenty-five thousand pulses per second is disclosed. In a laser adapted for continuous wave operation, a combination of a retardation element and an electrooptic modulator provides a first polarization state to intracavity radiation incident onto an intracavity polarization coupler oriented to couple out of the cavity radiation having the first polarization state to provide a high loss condition to the cavity to maintain the laser below threshold. A voltage applied quickly to the modulator converts the first polarization state to a second polarization state to provide a low loss condition to the cavity to Q-switch the laser. Terminating the voltage near the maximum Q-switch buildup converts the polarization to the first polarization state which is cavity dumped by the polarization coupler to provide an output pulse. Controlling the fall time of the voltage termination controls the pulse width of the output pulse while controlling the duration of the voltage controls the energy of the output pulse.

Method for cavity dumping a Q-switched laser

A laser having a gaseous gain medium capable of continuous wave operation and including an etalon with a Stark active gas disposed therein, adapted for providing submicrosecond pulses is disclosed. A method of utilizing the Stark effect to tune rapidly an etalon to form an output mirror having a variable reflectivity to Q-switch and cavity dump the optical flux within a laser to provide an output pulse of laser radiation having a submicrosecond pulse width, typically variable between fifty and three hundred fifty nanoseconds, at a pulse repetition frequency up to twenty-five kilohertz is disclosed. A laser typically having a carbon dioxide gain medium adapted for continuous wave operation includes a grating defining one end of the laser resonator and an output mirror defining the other end wherein the output mirror is an etalon formed with two mirrors containing a switching cell having a Stark active gas disposed therein. A voltage applied to the switching cell rapidly transforms the highly transmissive state of the output mirror to a highly reflective state to Q-switch the laser. Terminating the voltage rapidly transforms the highly reflective state of the output mirror to its original highly transmissive state to cavity dump the Q-switched optical pulse. Controlling the width, fall time and repetition rate of the voltage pulse controls the pulse intensity, pulse width and pulse repetition frequency of the laser output pulses.

Apparatus and method for cavity dumping a Q-switched laser

Apparatus for controlling the position of a parameter setting device of a gas turbine engine is disclosed. Techniques for improving the accuracy of the control system by incorporating an optical circuit for sensing physical parameters, such as linear position, pressure and temperature are developed. A fiber optic cable linking a remote intelligence processing unit with a sensing unit at the controlled device is employed in the preferred embodiment.

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Manchester, CT, United States of America

Carl J Buczek