&lt;title&gt;Design equations for a polygon laser scanner&lt;/title&gt;

Beiser, Leo

doi:10.1117/12.28057

Cited by 25 publications

(15 citation statements)

References 3 publications

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“…One of the most signnificant but inherent error is produced by the very construction of the polygon, that is by the eccentricity of the facets with regard to the pivot of the PM (in contrast to the GS, which has the rotational axis in the reflective plane of the oscillatory mirror). This produces [6][7][8][9][10][11][12] a multi-parameter non-linear scanning function which we have explored [13,14] -as presented in Section 6. As for the GS, the PM non-linarity of the scanning function requires a f-theta lens.…”

Section: Galvanometer-based and Polygon Scannersmentioning

confidence: 99%

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Polygon mirror scanners in biomedical imaging: a review

Duma

Podoleanu

2013

SPIE Proceedings

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We review briefly the different applications of polygonal mirror (PM) scanning heads in biomedical imaging, with a focus on Optical Coherence Tomography (OCT). This overview of biomedical optical systems that employ PMs include: (i) TD (Time Domain) OCT setups, where PM may be utilized for generating the modulation function of the system without separate translation stages; (ii) FD (Fourier Domain) OCT delay line systems, with PM arrays; (iii) broadband laser sources scanned in frequency, for SS (Swept Source) OCT, with the PM placed in various optical configurations; (iv) OCM (Optical Coherence Microscopy) system with double PMs; (v) 2D PM plus galvanometer-based scanner (GS) for fast lateral scanning (not only in OCT, but also in confocal microscopy). We discuss SSs, for which the various PMbased setups used are compared, in their evolution -from on-axis to off-axis polygons -and in the race to obtain higher scan speeds to achieve real-time in vivo medical imaging. The parameters, advantages and drawbacks of these different configurations are pointed out. A necessary comparison is also made with the much faster Fabry-Perot (FP) based SSs. Our approach on PM-based broadband laser sources scanned in frequency, based on a simple off-axis polygon configuration, is also presented. Some of its characteristic mathematical functions are inferred and evaluated.

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Section: Galvanometer-based and Polygon Scannersmentioning

confidence: 99%

“…(i) Scanners with rotating mirrors: monogon / plane mirror [4,5] or polygonal [6][7][8][9][10][11][12][13][14] -the latter prismatic or pyramidal, regular or irregular;…”

Section: Introductionmentioning

confidence: 99%

Polygon mirror scanners in biomedical imaging: a review

Duma

Podoleanu

2013

SPIE Proceedings

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“…The main types of scanners are [1,2]: rotating monogons or polygonal mirrors [7][8][9], galvanometer-based [10], and refractive -the latter mostly with Risley prisms [11][12][13], holographic, acousto-and electro-optical devices. They have been studied extensively [14], with regard to their specific applications -thus, to their necessary level of performances.…”

Section: Introductionmentioning

confidence: 99%

Mathematical model of a galvanometer-based scanner: simulations and experiments

2013

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The paper presents an insight into our current researches on galvanometer-based scanners (GSs). A brief overview is first performed on the state-of-the-art, as well as on some of our contributions to optimize the scanning and the command functions of this most used scanning device. Considerations on the use of GSs in high-end biomedical imaging applications such as Optical Coherence Tomography (OCT) are made, with a focus towards obtaining the best possible duty cycles and artifact-free OCT images when using GSs for lateral scanning, as studied in our previous works. The scope of our present study is to obtain the mathematical model of a GS system (motor and controller included) in order to optimize the command functions of the device and to support the development of some more advanced control structures. The study is centered on the mathematical and experimental modeling of GSs. Thus, the results of an experimental identification made on a classical multi-parameter mathematical model proposed for such a system are presented. The experiments are carried out in different operating regimes, and the specific characteristic parameters of the GS are determined. Using these parameters obtained experimentally, we carry out simulations in Mathlab Simulink to validate the theoretical model. With the indentified model, an extended control solution is proposed. We point out the match between the theory and the results of the simulations and of the testing for different types of input signals, such as triangular, sinusoidal, and sawtooth with different duty cycles.

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“…Their drawbacks are related to their multiple sources of errors [5], but their major issue is due to their inherent construction: the distance between the pivot and the facet produces a displacement of the point on which the reflection is produced on the PM facet -by contrast to the cases of the monogon rotational or of galvanometer (oscillatory) scanners, for which the laser beam can be focused on the rotational or oscillatory axis (which can be further more placed in the plane of the mirror). A designing calculus has been developed in the 90s on PMs [10], the issues of their lens and of the positioning of the PMs with regard to the optical axes of the lenses was studied [11], the scan patterns produced were investigated [12,13], and their perspectives were highlighted [14,15], despite the fact that they were replaced by galvoscanners in most applications in the 90s. We have developed an analysis of PM scanners [7], both analythical [9,16] and numerical [17], in an optomechanical approach.…”

Section: Optomechatronic Devicesmentioning

confidence: 99%

Building an optomechatronics group in a young university in Western Romania

Duma

Huţiu

Cira

et al. 2014

12th Education and Training in Optics and Photonics Conference

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We present our experience regarding the establishing of an interdisciplinary group with Optics as one of its main topic at the Aurel Vlaicu University of Arad (UAVA) -linked with the improvement through research of our educational activities. The 3OM Group (in Opto-Mechatronics, Optical Metrology, and Optics & Mechanics) is described in its evolution from optomechanics to photonics, the latter with a focus on OCT (Optical Coherence Tomography) -with the national and the international collaborations established, with universities from Romania, Europe and USA. While the research directions of the 3OM Group are presented, they are linked with the educational components implemented in the various subjects we teach, for both undergraduate and graduate students, both in Mechanical and in Electrical Engineering. The main effort is to integrate education and research, to move teaching beyond the classical aspects to put the stress on hands-on-experiments, as well as on research-based activities -even with undergraduates. The main goals of this approach are to obtain an early orientation towards innovation and discovery, with a taste for novelties and with a clear focus on international standards. While this account is only one of many, it offers our experience in passing through the difficulties of developing both research and education in Optics in a young university in an emergent economy in Eastern Europe.

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<title>Design equations for a polygon laser scanner</title>

Cited by 25 publications

References 3 publications

Polygon mirror scanners in biomedical imaging: a review

Polygon mirror scanners in biomedical imaging: a review

Mathematical model of a galvanometer-based scanner: simulations and experiments

Building an optomechatronics group in a young university in Western Romania

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