Optical position sensor and position determination method
First Claim
Patent Images
1. A method of measuring a position comprising:
- receiving at least two phase displaced signals in response to the position;
selecting one of the phase displaced signals for measuring the position; and
determining the position based on the selected signal.
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Abstract
A method of position measurement by processing at least two phase displaced signals and by selecting one signal for position measurement at a given position point. Specifically, the two phase displaced signals are quadrature signals and the selected signal has a more linear waveform slope relative to time at a given position point than the non-selected signal.
29 Citations
52 Claims
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1. A method of measuring a position comprising:
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receiving at least two phase displaced signals in response to the position;
selecting one of the phase displaced signals for measuring the position; and
determining the position based on the selected signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of measuring a position comprising:
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transforming a position into two phase displaced output signals;
processing the two phase displaced output signals to generate two digital square waveforms;
identifying a selected one of the output signals for the position based on the output signals; and
determining the position according to the two digital square waveforms and the selected output signal. - View Dependent Claims (12, 13, 14, 15, 17, 19, 20, 21)
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16. A method of measuring volume displaced by an infusion pump comprising:
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transforming a position into two phase displaced output signals, wherein the position is in response to volume displacement of the infusion pump;
processing the two phase displaced output signals to generate two digital square waveforms;
identifying a selected one of the output signals for the position based on the output signals;
determining the position according to the two digital square waveforms and the selected output signal; and
determining the volume displaced by the infusion pump according to the position.
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18. A method of detecting a position movement of an object comprising:
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transforming a signal of a position movement into a high-resolution digitized analog signal; and
detecting the digitized analog signal, wherein the detection of the digitized analog signal indicates the position movement.
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22. A method of monitoring a volume displacement in a pump comprising:
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transforming a position of a pumping element in the pump into two phase displaced output signals, wherein the position is in response to a volume displacement of the pumping element;
processing the two phase displaced output signals to generate two high-resolution digitized analog signals;
identifying a selected one of the digitized analog signals for the position based on the digitized analog signals; and
monitoring the volume displacement based on the selected digitized analog signal. - View Dependent Claims (23, 24, 26, 27, 28)
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25. A method for monitoring the quality of a position measuring system comprising:
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calculating phase relation of two phase displaced output signals of a position measuring system; and
comparing the phase relation to a pre-determined value, wherein a deviation of the phase relation from the pre-determined value indicates abnormality of the position system.
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29. A system for measuring a position comprising:
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a processing unit responsive to two sinusoidal or quasi-sinusoidal waveforms and two digital square waveforms for measuring the position, wherein the processing unit;
selects one of said two waveforms for the position;
calculates a first value from the two digital square waveforms;
calculates a second value from the selected sinusoidal waveform for the position; and
adds the first and second values to measure the position.
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30. A system for measuring a position comprising:
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an optical unit generating two phase displaced analog signals in response to a position;
a low-resolution processing unit connected to the optical unit which generates two digital square waveforms from the two phase displaced analog signals;
a high-resolution processing unit connected to the optical unit which generates two digitized waveforms corresponding to the two phase displaced analog signals; and
a processing unit, responsive to the two digital square waveforms from the low-resolution processing unit and the two digitized waveforms from the high-resolution processing unit, wherein the processing unit comprises a processor which;
selects a digitized waveform for the position;
calculates a first value from the two digital square waveforms;
calculates a second value from the selected digitized waveform for the position; and
adds the first and second values to measure the position. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A system for processing output signals from an encoder comprising:
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a low-resolution unit receiving two phase displaced analog signals from an encoder and generating two digital square waveforms from the two phase displaced analog signals;
a high-resolution processing unit receiving the two phase displaced analog signals and generating two digitized waveforms from the two phase displaced analog signals; and
a processing unit, responsive to the two digital square waveforms from the low-resolution processing unit and the two digitized waveforms from the high-resolution processing unit, wherein the processing unit comprises a processor including;
selecting means for selecting a selected digitized waveform for the position;
first calculating means for calculating a first value from the two digital square waveforms;
second calculating means for calculating a second value from the selected digitized waveform for the position;
adding means for adding the first and second values to measure the position.
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42. A system for measuring a position comprising:
a processing unit responsive to two phase displaced waveforms in response to a position, wherein the processing unit selects one of said two phase displaced waveforms for measuring the position and determining position based on the selected waveform. - View Dependent Claims (43, 44, 45, 46, 47, 49, 50)
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48. A system for monitoring a volume displacement in a pump comprising:
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a high-resolution processing unit transforming a position of a pumping element in the pump into two phase displaced digitized analog signals, wherein the position is in response to a volume displacement; and
a processing unit responsive to the two phase displaced digitized analog signals from the high-resolution processing unit, wherein the processing unit selects one of the two digitized analog signals for the position, and monitors the volume displacement based on the selected digitized analog signal for the position.
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51. A system for measuring volume displaced by an infusion pump comprising:
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a low resolution processing unit generating two digital square waveforms from two phase displaced analog signals in response to a position of a pumping element corresponding to a volume displaced by an infusion pump, a high-resolution processing unit generating two digitized analog waveforms corresponding to the two phase displaced analog signals; and
a processing unit, responsive to the two digital square waveforms from the low-resolution processing unit and the two digitized analog waveforms from the high-resolution processing unit, wherein the processing unit comprises a processor which selects a digitized waveform for the position;
calculates a first value from the two digital square waveforms;
calculates a second value from the selected digitized analog waveform for the position;
adds the first and second values to measure the position; and
measures the volume displaced by the infusion pump based on the position. The system of claim 51, wherein the two phase displaced analog signals are generated by an optical unit.
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52. A system for monitoring the quality of a position measuring system comprising:
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a processing unit responsive to two phase displaced output signals of a position measuring system, wherein the processing unit comprises a processor which calculates the phase relation of the two phase displaced output signals of the position measuring system, and compares the phase relation to a pre-determined value, wherein a deviation of the phase relation from the pre-determined value indicates abnormality of the position system.
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Specification