Author: claimsbot

1. A motor control system for energizing a sine wave-like stairway current according to a pulse train command impressed from an external;
said motor control system comprising:
a first counting means for counting the number of steps of said pulse train command;
a latch means for holding a counting value of said first counting means with a latch signal and finding a position command;
a reference signal generating means for generating said latch signal and a reference clock signal;
a first calculating means for calculating a pulse spacing of said pulse train command with said reference clock signal; and
a second calculating means for calculating a time interval of from generation of said pulse train command to generation of said latch signal with said reference clock signal;
wherein said position command is corrected using command pulse spacing information calculated by said first calculating means and time difference information calculated by said second calculating means.
2. A motor control system according to claim 1, wherein said motor control system is designed such that said motor control system periodically carries out micro step control for a stepping motor synchronously with said latch signal.
3. A motor control system according to claim 1, wherein said motor control system is designed such that said motor control system causes a correction value of said position command to amount to zero at the time when a motor is stopped.
4. A motor control system according to claim 3, wherein said motor control system includes a second counting means for counting said reference clock signal, clearing a counting value when said pulse train command is output, and outputting an overflow signal when said counting value exceeds a predetermined value, and wherein said motor control system is designed such that said motor control system causes said correction value to amount to zero when said overflow signal is output.

The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.

1. An optical resonator comprising:
an optical cavity and a phase-only optical element defining each end thereof, operable to sustain circulating laser beam therein:
wherein each phase-only optical element is operable to transform an intensity profile of a stable single mode of the laser beam without changing the mode of the laser beam during propagation along a length of the optical resonator, such that the single-mode laser beam changes its intensity profile continuously in the optical resonator while it circulates back and forth with the intensity profile of the laser beam at a first end of the optical resonator being Gaussian and with the intensity profile at a second end of the optical resonator being non-Gaussian.
2. The optical resonator as claimed in claim 1, wherein the optical resonator includes a gain medium located within the optical cavity and in which the gain medium is arranged more towards one end of the optical resonator.
3. The optical resonator as claimed in claim 2, wherein the gain medium is arranged towards the second end, for higher energy extraction than had the gain medium not been arranged towards the second end.
4. The optical resonator as claimed in claim 1, wherein the optical resonator includes an output coupling at the first end to produce an output laser beam having a Gaussian intensity profile with a lower divergence than had the intensity profile of the laser beam been constant.
5. The optical resonator as claimed in claim 1, wherein the intensity profile at the second end of the optical resonator is a Flat-Top Beam (FTB) profile.
6. A laser apparatus which includes:
the optical resonator as claimed in claim 1; and
associated drive and control circuitry to operate the optical resonator.
7. A method of generating a laser beam inside an optical resonator having a phase-only optical element defining each end thereof and operable to circulate the laser beam therein, the method including:
transforming, by means of the optical elements, an intensity profile of a stable single mode of the laser beam, without changing the mode of the laser beam during propagation along a length of the optical resonator, such that the single-mode laser beam changes its intensity profile continuously in the optical resonator while it circulates back and forth with the intensity profile of the laser beam at a first end of the optical resonator being Gaussian and with the intensity profile at a second end of the optical resonator being non-Gaussian.
8. The optical resonator as claimed in claim 5, wherein the intensity profile of the stable, single-mode laser beam between the first and second ends is a weighted average between Gaussian and Flat-Top Beam (FTB).

1. A first stage turbine disk section for a gas turbine engine, comprising:
(a) a centrally disposed disk hub having a radially outwardly extending web terminating at an outer end; and
(b) the disk hub having a convex, continuously curved hub surface defining an apex positioned at a medial location on the hub surface opposite the outer end, the location of the apex selected so as to reduce the peak axial compressive stress by forcing the principal stress field to transition from being primarily axially oriented to primarily radially oriented, the continuously curved hub surface acting to reduce the effective axial constraint at the apex and to separate the peak axial and hoop stresses such that the surface effective stress is optimized to its minimum value, thereby mitigating the formation of undesirable axial stress in the disk hub.
2. A gas turbine section according to claim 1, wherein the disk hub includes only a convex, continuously curved hub surface and no cylindrical or frusto-conical hub surface areas thereon.
3. A gas turbine section according to claim 1, wherein the convex, continuously curved hub surface is positioned to shift maximum axial stress and hoop stress on the disk hub out of mutual alignment, thereby reducing the magnitude of the effective stress on the hub surface.
4. A method of reducing axial stress in a disk hub of a gas turbine disk, comprising the steps of:
(a) determining the location of stress gradients in a gas turbine disk hub;
(b) forming a convex, curved surface section in a disk hub surface of the disk hub that axially displaces peak axial stress relative to peak hoop stress and reduces the peak axial stress, thereby reducing the magnitude of the effective stress on the disk bore surface.

The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.

What is claimed is:

1. In a fiber optic system, a method for aligning a beam of light and an optical fiber comprising
a central core and a cladding, comprising the steps:
directing said beam of light toward said optical fiber,
detecting light in the cladding of said optical fiber;
adjusting the relative orientation of said beam of light and said optical fiber until said light detected in said cladding reaches a minimum.
2. A method according to claim 1 further comprising determining a minimum
3. A method according to claim 2 wherein said determining a minimum step comprises:
sweeping said beam of light across a face of said optical fiber,
monitoring the amount of light detected by said cladding detector as said beam of light sweeps across said face, and
selecting a smallest value corresponding to light detected by said cladding detector during said sweeps.
4. A method according to claim 1 wherein said minimum corresponds to no light being detected in said cladding.
5. A method according to claim 1 wherein light travelling down the core of said fiber is not measured in connection with said adjusting step.
6. A method according to claim 1 wherein said beam of light is caused to move in a first axis at a first frequency and in a second axis at a second frequency, and the amount of light detected in said cladding is filtered according to said frequencies.
7. A method according to claim 1 comprising detecting light in said cladding from a plurality of locations around a circumference of said fiber.