Method and system for measuring vibration of an object
First Claim
1. A method for measuring vibration of an object having a pair of substantially coplanar, spaced-apart marks, the method comprising:
- providing calibration data based on a correlation of a change in distance between the spaced-apart marks in a detector plane substantially parallel to the spaced-apart marks to physical movement of the object including the spaced-apart marks;
generating a plurality of images including the spaced-apart marks from signals reflected from the object in the detector plane;
measuring energy in the images in the detector plane to produce a plurality of signals; and
processing the plurality of signals with the calibration data to obtain a vibration measurement of the object.
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Accused Products
Abstract
A method and system are provided for measurement of vibration of an object utilizing a non-contact imaging sensor such as a video camera. An object which does not already have a pair of spaced-apart marks is marked with two parallel lines spaced apart from one another a known, nominal distance. The two lines are perpendicular to an imaging axis of the camera. As such, when the object with the parallel lines is moved toward or away from the video camera, the lines on the object appear to move as two parallel lines in the image plane of the camera. As the object moves or vibrates along the imaging axis, the nominal image plane distance between the two lines changes. This apparent change in the distance between the parallel lines in the image plane is calibrated to the physical movement of the object in space due to deformation or rigid body motions.
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Citations
19 Claims
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1. A method for measuring vibration of an object having a pair of substantially coplanar, spaced-apart marks, the method comprising:
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providing calibration data based on a correlation of a change in distance between the spaced-apart marks in a detector plane substantially parallel to the spaced-apart marks to physical movement of the object including the spaced-apart marks;
generating a plurality of images including the spaced-apart marks from signals reflected from the object in the detector plane;
measuring energy in the images in the detector plane to produce a plurality of signals; and
processing the plurality of signals with the calibration data to obtain a vibration measurement of the object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for measuring vibration of an object having a pair of substantially coplanar, spaced-apart marks, the system comprising:
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means for generating an image including the spaced-apart marks in a detector plane substantially parallel to the spaced-apart marks;
means for storing calibration data based on a correlation of a change in distance between the spaced-apart marks in the detector plane to physical movement of the object including the spaced-apart marks;
means for generating a plurality of images including the spaced-apart marks from signals reflected from the object in the detector plane substantially parallel to the spaced-apart marks;
at least one detector for measuring energy in the images in the detector plane to produce a plurality of signals; and
a signal processor for processing the plurality of signals with the calibration data to obtain a vibration measurement of the object. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification