Smooth rotation by a galvanometer
AssigneeLinear Instruments
InventorJames L. Mills
Life of this patent
Estimating the term…
Abstract
A method and device for smoothly rotating a diffraction grating in a spectrophotometer by means of a galvanometer includes modifications in the software in the microprocessor which controls the galvanometer. The software modifications cause the galvanometer to rotate the grating in a series of discrete steps that stimulate a smooth minimum jerk rotation. The amount of rotation in each discrete step is calculated by the microprocessor.
Claims15
A method for smoothly rotating an object to a desired position by use of an electric motor, comprising the steps of:
- calculating a series of discrete step signals simulating a smooth rotation of the object to the desired position by the electric motor, wherein an angular acceleration of the object is equal to a constant times a sine function of time;
- and
- providing the step signals to drive the electric motor.
A system for smoothly rotating an object to a desired position, comprising:
- motor means for rotating the object;
- and
- means for providing a series of discrete step signals for driving the motor means, wherein the step signals simulate a smooth rotation of the object to the desired position by the motor means, wherein an angular acceleration of the object is equal to a constant times a sine function of time.
A system for smoothly rotating an object to a desired position comprising:
- control means for generating analog step commands to move the object;
- means for moving the object;
- a position sensor for sensing a position of the object and generating a position sensor signal therefrom;
- means for damping the signal generated by the position sensor and generating a damped position sensor signal therefrom;
- first combining means for combining the analog step commands and said position sensor signal;
- a lag amplifier and a proportional amplifier connected in parallel for each receiving the combined analog step commands and said position sensor signal;
- and
- second combining means for combining the damped position sensor signal, and the output signals of the lag amplifier and proportional amplifier, and providing a resultant signal to the means for moving, so as to move the object with minimum jerk.
A system for smoothly rotating an object to a desired position, comprising:
- control means for generating analog step commands to move the object;
- a filter for filtering the analog step commands;
- means for moving the object;
- a position sensor for sensing a position of the object and generating a position sensor signal therefrom;
- means for damping the signal generated by the position sensor and generating a damped position sensor signal therefrom;
- means for combining the filtered analog step commands and said position sensor signal;
- a feed forward circuit for feeding forward the filtered analog step commands;
- a lag amplifier and a proportional amplifier connected in parallel for each receiving the combined filtered analog step commands and the undamped signal from the position sensor signal;
- and
- means for combining the damped position sensor signal, the fed forward filtered analog step commands, and the output signals of the lag amplifier and proportional amplifier, and providing a resultant signal to the means for moving, so as to move the object with minimum jerk.
Dependencies are inferred from the claim text.