Absolute Phase Drift Analysis and Correction of Asymmetric Spatial Heterodyne Interferometer for Wind Detection

Accurate interpretation of interferometric image requires an extremely challenging task based on actual phase reconstruction for incomplete noise observation. In spite of the establishment of comprehensive solutions, until now, a guaranteed means of solution method is yet to exist. The initially observed interferometric image is formed by 2π-periodic phase image that wrapped within (-π, π]. Such inverse problem is further corrupted by noise distortion and leads to the degradation of interferometric image. In order to overcome this, an effective algorithm that enables noise suppression and absolute phase reconstruction of interferometric phase image is proposed. The proposed method incorporates an improved order statistical filter that is able to adjust or vary on its filtering rate by adapting to phase noise level of relevant interferometric image. Performance of proposed method is evaluated and compared with other existing phase estimation algorithms. The comparison is based on a series of computer simulated and real interferometric data images. The experiment results illustrate the effectiveness and competency of the proposed method.

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Phase Drift Phenomenon in Dual Active Bridge Converter – Analysis and Compensation

International Review of Electrical Engineering (IREE) ◽

10.15866/iree.v10i1.5207 ◽

2015 ◽

Vol 10 (1) ◽

pp. 1 ◽

Cited By ~ 2

Author(s):

Vesa Väisänen ◽

Jani Hiltunen ◽

Raimo Juntunen

Keyword(s):

Phase Drift ◽

Dual Active Bridge

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TWO FREQUENCY "UNAMBIGUOUS" HETERODYNE INTERFEROMETER BASED ON PHASE LOCKED MILLIMETER-WAVE BAND TRANSCEIVERS

Telecommunications and Radio Engineering ◽

10.1615/telecomradeng.v76.i10.70 ◽

2017 ◽

Vol 76 (10) ◽

pp. 903-918

Author(s):

A. V. Varavin ◽

G. P. Ermak ◽

A. S. Vasilev ◽

A. V. Fateev ◽

N. V. Varavin ◽

...

Keyword(s):

Millimeter Wave ◽

Wave Band ◽

Heterodyne Interferometer ◽

Millimeter Wave Band

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Drift Analysis and Evolutionary Algorithms Revisited

Combinatorics Probability Computing ◽

10.1017/s0963548318000275 ◽

2018 ◽

Vol 27 (4) ◽

pp. 643-666 ◽

Cited By ~ 13

Author(s):

J. LENGLER ◽

A. STEGER

Keyword(s):

Evolutionary Algorithms ◽

Evolutionary Algorithm ◽

Random Search ◽

Optimization Algorithms ◽

Simple Algorithm ◽

Linear Functions ◽

Search Point ◽

Drift Analysis ◽

Fixed Constant ◽

Greedy Optimization

One of the easiest randomized greedy optimization algorithms is the following evolutionary algorithm which aims at maximizing a function f: {0,1}n → ℝ. The algorithm starts with a random search point ξ ∈ {0,1}n, and in each round it flips each bit of ξ with probability c/n independently at random, where c > 0 is a fixed constant. The thus created offspring ξ' replaces ξ if and only if f(ξ') ≥ f(ξ). The analysis of the runtime of this simple algorithm for monotone and for linear functions turned out to be highly non-trivial. In this paper we review known results and provide new and self-contained proofs of partly stronger results.

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A phase differential heterodyne interferometer for simultaneous measurement of straightness error and displacement

Optics Communications ◽

10.1016/j.optcom.2021.127195 ◽

2021 ◽

pp. 127195

Author(s):

Yingtian Lou ◽

Zhaoyang Li ◽

Liping Yan ◽

Benyong Chen ◽

Jiancheng Jian

Keyword(s):

Simultaneous Measurement ◽

Heterodyne Interferometer ◽

Straightness Error

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Absolute Phase Retrieval Using One Coded Pattern and Geometric Constraints of Fringe Projection System

Applied Sciences ◽

10.3390/app8122673 ◽

2018 ◽

Vol 8 (12) ◽

pp. 2673 ◽

Cited By ~ 4

Author(s):

Xu Yang ◽

Chunnian Zeng ◽

Jie Luo ◽

Yu Lei ◽

Bo Tao ◽

...

Keyword(s):

Phase Shift ◽

Phase Retrieval ◽

Code Word ◽

Geometric Constraints ◽

Fringe Projection ◽

Average Intensity ◽

Fringe Order ◽

Projection System ◽

Absolute Phase ◽

Three Phase

Fringe projection technologies have been widely used for three-dimensional (3D) shape measurement. One of the critical issues is absolute phase recovery, especially for measuring multiple isolated objects. This paper proposes a method for absolute phase retrieval using only one coded pattern. A total of four patterns including one coded pattern and three phase-shift patterns are projected, captured, and processed. The wrapped phase, as well as average intensity and intensity modulation, are calculated from three phase-shift patterns. A code word encrypted into the coded pattern can be calculated using the average intensity and intensity modulation. Based on geometric constraints of fringe projection system, the minimum fringe order map can be created, upon which the fringe order can be calculated from the code word. Compared with the conventional method, the measurement depth range is significantly improved. Finally, the wrapped phase can be unwrapped for absolute phase map. Since only four patterns are required, the proposed method is suitable for real-time measurement. Simulations and experiments have been conducted, and their results have verified the proposed method.

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