Method for obtaining crosstalk-free phase required by three-dimensional measurement by using frequency multiplexing
By using the synthesis method of phase shift fringe pattern and composite fringe pattern in photoelectric detection technology, the phase shift is directly calculated, which solves the problem of high-frequency information loss in frequency multiplexing three-dimensional measurement, and improves the measurement accuracy and speed.
CN119687826AActive Publication Date: 2025-03-25NANCHANG HANGKONG UNIVERSITY
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Patent Information
- Application Number
- CN202411720530.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2044-11-28
AI Technical Summary
Technical Problem
When using frequency multiplexing for three-dimensional measurements, the separation process of the composite stripe pattern results in loss of high-frequency information, reducing measurement accuracy.
Method used
By making a phase shifted stripe pattern and synthesizing a composite stripe pattern, the four-step phase shift method and three-frequency heterodyne method are used to calculate the phase shift directly from the composite stripe pattern, skipping the separation step of the composite stripe pattern.
Benefits of technology
It reduces high-frequency information loss, improves the accuracy of high-speed three-dimensional measurements, and reduces projection and shooting time.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention discloses a method for obtaining a phase required by three-dimensional measurement by using frequency reuse, and the method comprises the steps: making a phase shift fringe pattern according to the requirements of a three-frequency heterodyne method employing a four-step phase shift method, and enabling the phase shift fringe pattern of each phase shift angle to be divided into three frequencies; arranging the prepared fringe patterns from small phase shift angles to large phase shift angles from 0 phase shift angle to 0 phase shift angle, and respectively recording the phase shift angles as # imgabs0 # and # imgabs1 #; extracting three fringe patterns with different frequencies of the phase shift angle # imgabs2 #, and combining the three fringe patterns with the phase shift angle # imgabs3 # to make a composite fringe pattern; using the manufactured composite fringe pattern, replacing the fringe pattern at a certain frequency with a fringe pattern with a phase shift angle of # imgabs4 #, keeping the other two fringe patterns unchanged, and manufacturing a composite fringe pattern; the three frequencies are respectively operated by the same method; and obtaining the continuous phase of the measured object by using a three-frequency heterodyne method. According to the invention, the required projection and shooting time is less, the information loss is less, and the precision of high-speed three-dimensional measurement is improved.
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