Doppler velocimeter and position information detection apparatus for use with objects having variations in surface depth
First Claim
1. A position information detection apparatus comprising:
- a first detection system for radiating two collimated light beams onto an object to be measured at a crossing angle to form interference fringes at a predetermined interval, said first detection system detecting scattered light emanating from the object to be measured by the interference fringes at the predetermined interval;
a second detection system for radiating two light beams onto the object to be measured at a crossing angle to form interference fringes having a gradient with each other in an opposing direction to the object to be measured, said second detection system detecting scattered light emanating from the object to be measured by the interference fringes having the gradient; and
detection means for comparing output signals from said first and second detection systems, and detecting relative position information of the object to be measured, along an opposing direction of said first and second detection systems to the object to be measured.
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Accused Products
Abstract
A position information detection apparatus includes a first detection system for radiating two collimated light beams onto an object to be measured at a predetermined crossing angle to form interference fringes at a predetermined interval, and detecting scattered light emanating from the object to be measured by the interference fringes at the predetermined interval, a second detection system for radiating two light beams onto the object to be measured at a predetermined crossing angle to form interference fringes having a gradient with each other in an opposing direction to the object to be measured, and detecting scattered light emanating from the object to be measured by the interference fringes having the gradient, and a detection unit for comparing output signals from the first and second detection systems, and detecting relative position information, along the opposing direction of the first and second detection systems, of the object to be measured.
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Citations
19 Claims
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1. A position information detection apparatus comprising:
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a first detection system for radiating two collimated light beams onto an object to be measured at a crossing angle to form interference fringes at a predetermined interval, said first detection system detecting scattered light emanating from the object to be measured by the interference fringes at the predetermined interval; a second detection system for radiating two light beams onto the object to be measured at a crossing angle to form interference fringes having a gradient with each other in an opposing direction to the object to be measured, said second detection system detecting scattered light emanating from the object to be measured by the interference fringes having the gradient; and detection means for comparing output signals from said first and second detection systems, and detecting relative position information of the object to be measured, along an opposing direction of said first and second detection systems to the object to be measured. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A velocimeter comprising:
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a first detection system for radiating two collimated light beams onto an object to be measured at a crossing angle to form interference fringes at a predetermined interval, said first detection system detecting scattered light emanating from the object to be measured by the interference fringes at the predetermined interval; velocity information detection means for detecting moving velocity information relative to the object to be measured on the basis of an output signal from said first detection system; a second detection system for radiating two light beams onto the object to be measured at a crossing angle to form interference fringes having a gradient with each other in an opposing direction to the object to be measured, said second detection system detecting scattered light emanating from the object to be measured by the interference fringes having the gradient; and relative position information detection means for comparing output signals from said first and second detection systems, and detecting relative position information of the object to be measured, along an opposing direction of said first and second detection systems to the object to be measured. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A position information detection apparatus comprising:
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a first detection system for radiating two collimated light beams onto an object to be measured at a crossing angle to form interference fringes at a predetermined interval, said first detection system detecting scattered light emanating from the object to be measured by the interference fringes at the predetermined interval; a second detection system for radiating two light beams onto the object to be measured at a crossing angle to form interference fringes having a gradient with each other, said second detection system detecting scattered light emanating from the object to be measured by the interference fringes having the gradient; and signal processing unit for comparing output signals from said first and second detection system, and detecting relative position information of the object to be measured, along a direction differing from a direction of arrangement of the interference fringes at the predetermined interval. - View Dependent Claims (18, 19)
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Specification