A Tip-Tilt Adaptive Optics System for Amateur Astronomers and Optimum Placement of Actuators

Chakraborty, ParthaPratim; Behdinan, Kamran; Tabarrok, B.

doi:10.1006/jsvi.1999.2285

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…These typically employ flexure hinges, as these provide no friction, backlash, or wear, and a high-accuracy actuation part, such as piezo-actuators [125][126][127], electromagnets [128][129][130] or servos [131]. However, the use of such flexure hinges can also lead to problems such as the distortion of the mirror surface at larger deflections [132]. Using a flexure ring instead of individual hinges attached to the mirror can compensate for this [133].…”

Section: Pointing Mechanismsmentioning

confidence: 99%

High-Precision Low-Cost Gimballing Platform for Long-Range Railway Obstacle Detection

Assaf

Cornelius

Cadena

et al. 2022

Sensors

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Increasing demand for rail transportation results transportation by rail, resulting in denser and more high-speed usage of the existing railway network, making makes new and more advanced vehicle safety systems necessary. Furthermore, high traveling speeds and the greatlarge weights of trains lead to long braking distances—all of which necessitates Long braking distances, due to high travelling speeds and the massive weight of trains, necessitate a Long-Range Obstacle Detection (LROD) system, capable of detecting humans and other objects more than 1000 m in advance. According to current research, only a few sensor modalities are capable of reaching this far and recording sufficiently accurate enoughdata to distinguish individual objects. The limitation of these sensors, such as a 1D-Light Detection and Ranging (LiDAR), is however a very narrow Field of View (FoV), making it necessary to use ahigh-precision means of orienting to target them at possible areas of interest. To close this research gap, this paper presents a novel approach to detecting railway obstacles by developinga high-precision pointing mechanism, for the use in a future novel railway obstacle detection system In this work such a high-precision pointing mechanism is developed, capable of targeting aiming a 1D-LiDAR at humans or objects at the required distance. This approach addresses To address the challenges of a low target pricelimited budget, restricted access to high-precision machinery and equipment as well as unique requirements of our target application., a novel pointing mechanism has been designed and developed. By combining established elements from 3D printers and Computer Numerical Control (CNC) machines with a double-hinged lever system, simple and cheaplow-cost components are capable of precisely orienting an arbitrary sensor platform. The system’s actual pointing accuracy has been evaluated using a controlled, in-door, long-range experiment. The device was able to demonstrate a precision of 6.179 mdeg, which is at the limit of the measurable precision of the designed experiment.

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Section: Pointing Mechanismsmentioning

confidence: 99%

High-Precision Low-Cost Gimballing Platform for Long-Range Railway Obstacle Detection

Assaf

Cornelius

Cadena

et al. 2022

Sensors

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“…A novel class of PZT actuated nanopositioning mechanisms has previously been developed, as discussed by Dagalakis et al (2001), which may be particularly useful in the development of high-bandwidth, high-accuracy beam-steering devices. Chakraborty et al (1999) developed a PZT actuated tip-tilt adaptive optics mirror; the mirror is modeled as a thin circular plate with a peripheral ring mass and an elastic edge support, and with three interior actuators.…”

Section: Introductionmentioning

confidence: 99%

Modeling and design of a novel precision tilt positioning mechanism for inter-satellite optical communication

Shao¹,

Chen²,

Rong³

et al. 2009

Smart Mater. Struct.

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The compact precise tilt positioning mechanism (PTPM) determines the performance of inter-satellite optical communication systems. This paper presents a novel structural design of a PTPM in which the tilt movement is implemented by the elastic deformation of a flexure ring. The flexure ring promises zero friction and zero clearance. The stiffness model of the flexible ring was built based on an analysis of the structural mechanics. Then a dynamic model is presented based on the Lagrange equation. A modal analysis and an experimental investigation were performed. The error between the three methods is less than 10%.

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The research on a novel PZT actuated precise tilt positioning system

Shao

Chen

Rong

et al. 2009

2009 4th IEEE Conference on Industrial Electronics and Applications

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A Tip-Tilt Adaptive Optics System for Amateur Astronomers and Optimum Placement of Actuators

Cited by 3 publications

References 12 publications

High-Precision Low-Cost Gimballing Platform for Long-Range Railway Obstacle Detection

High-Precision Low-Cost Gimballing Platform for Long-Range Railway Obstacle Detection

Modeling and design of a novel precision tilt positioning mechanism for inter-satellite optical communication

The research on a novel PZT actuated precise tilt positioning system

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