Frequency selection rule for high definition and high frame rate Lissajous scanning

Hwang, Kyungmin; Seo, Yeong‐Hyeon; Ahn, JoongHo; Kim, Pilhan; Jeong, Ki‐Hun

doi:10.1038/s41598-017-13634-3

Cited by 67 publications

(51 citation statements)

References 34 publications

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“…However, as shown in the previous results, the intensity measurement results are distributed unevenly due to the sparse scan pattern generated with a relatively slow scanner. Although not demonstrated in this work, high definition and high frame rate Lissajous scan can be achieved by appropriate selection of the scan frequency without having to increase the scan frequency dramatically [9].…”

Section: Distance Measurement Using a 2d Low-frequency Lissajous Scannermentioning

confidence: 94%

Intensity-based laser distance measurement system using 2D electromagnetic scanning micromirror

Kim

Hwang

2018

Micro and Nano Syst Lett

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In this research, we present the feasibility testing results of a simple distance measurement system using microfabricated scanning micromirrors. Two different configurations have been tested with different types of micromirrors. In the first configuration, Lissajous scan pattern has been generated with horizontal scan frequency of 715 Hz, and the intensity of the laser beam reflected from the object has been measured with avalanche photodiode to estimate the distance. The position of the beam has been tracked using a separate position sensitive detector. Signals from both sensors are synchronized by eliminating the signal delay, which enables the detection of the distance of a specific point in the 2-dimensional scan pattern. In the simplified configuration, faster scanning micromirror with horizontal scan frequency of 28.8 kHz has been used to increase the resolution and position sensitive detector has been removed from the system by synchronizing the driving current waveform with the avalanche photodiode signals. Distance measurement from 20 to 50 cm has been demonstrated with the developed system. © The Author(s) 2018. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creat iveco mmons .org/licen ses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Section: Distance Measurement Using a 2d Low-frequency Lissajous Scannermentioning

confidence: 94%

Intensity-based laser distance measurement system using 2D electromagnetic scanning micromirror

Kim

Hwang

2018

Micro and Nano Syst Lett

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“…The raster scanners require high operating voltages to get slow-axis scans and have difficulties incorporating them in small spaces, which make them less usable in clinical devices [130].…”

Section: Raster Scanningmentioning

confidence: 99%

“…A higher frame rate can be achieved using a larger amplitude compared to a raster scanner. However, the illumination beam density is variable within the scanned image and is higher at the center compared to the outer surface [130].…”

Section: Spiral Scanningmentioning

confidence: 99%

Endoscopic Optical Imaging Technologies and Devices for Medical Purposes: State of the Art

2020

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The growth and development of optical components and, in particular, the miniaturization of micro-electro-mechanical systems (MEMSs), has motivated and enabled researchers to design smaller and smaller endoscopes. The overarching goal of this work has been to image smaller previously inaccessible luminal organs in real time, at high resolution, in a minimally invasive manner that does not compromise the comfort of the subject, nor introduce additional risk. Thus, an initial diagnosis can be made, or a small precancerous lesion may be detected, in a small-diameter luminal organ that would not have otherwise been possible. Continuous advancement in the field has enabled a wide range of optical scanners. Different scanning techniques, working principles, and the applications of endoscopic scanners are summarized in this review.

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“…However, it should be noted that the scanning speed and illumination density distribution condition may affect the performance of this scanning approach [12,13]. One can choose the proper sampling strategy according to the application requirements, and some selection rules can be found in [14].…”

Section: Scanning-based Approachmentioning

confidence: 99%

Single-Pixel MEMS Imaging Systems

Zhou

Lim

2020

Micromachines

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Single-pixel imaging technology is an attractive technology considering the increasing demand of imagers that can operate in wavelengths where traditional cameras have limited efficiency. Meanwhile, the miniaturization of imaging systems is also desired to build affordable and portable devices for field applications. Therefore, single-pixel imaging systems based on microelectromechanical systems (MEMS) is an effective solution to develop truly miniaturized imagers, owing to their ability to integrate multiple functionalities within a small device. MEMS-based single-pixel imaging systems have mainly been explored in two research directions, namely the encoding-based approach and the scanning-based approach. The scanning method utilizes a variety of MEMS scanners to scan the target scenery and has potential applications in the biological imaging field. The encoding-based system typically employs MEMS modulators and a single-pixel detector to encode the light intensities of the scenery, and the images are constructed by harvesting the power of computational technology. This has the capability to capture non-visible images and 3D images. Thus, this review discusses the two approaches in detail, and their applications are also reviewed to evaluate the efficiency and advantages in various fields.

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Frequency selection rule for high definition and high frame rate Lissajous scanning

Cited by 67 publications

References 34 publications

Intensity-based laser distance measurement system using 2D electromagnetic scanning micromirror

Intensity-based laser distance measurement system using 2D electromagnetic scanning micromirror

Endoscopic Optical Imaging Technologies and Devices for Medical Purposes: State of the Art

Single-Pixel MEMS Imaging Systems

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