Accuracy of position detection using a position-sensitive detector

Schaefer, Pierre-Loup; Williams, Ronald D.; Davis, Glenn; Ross, Robert A.

doi:10.1109/19.744642

Cited by 26 publications

(17 citation statements)

References 8 publications

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“…This goal is expected to be attainable through the use of synchronous detection [15], which is the next step in the development of ASAP, and nonlinear calibration. The characteristic PSD nonlinearity evident in the system can be calibrated out, as the detectors are repeatable to submicron levels [14]. This work is in progress.…”

Section: Discussionmentioning

confidence: 99%

“…A two-dimensional position-sensitive detector is an analog sensor that puts out currents related to the x and y position of a light spot on its active surface. Position-sensitive detectors are frequently used in remote position sensing applications [14,15]. They require no contact with the sensed object, and feature high position resolution and fast response [14], although they also often have significant thermal drift.…”

Section: Introductionmentioning

confidence: 99%

“…Position-sensitive detectors are frequently used in remote position sensing applications [14,15]. They require no contact with the sensed object, and feature high position resolution and fast response [14], although they also often have significant thermal drift. Direct illumination from lasers or light-emitting diodes (LEDs) is typically used for sensing, but a reflective approach is also possible.…”

Section: Introductionmentioning

confidence: 99%

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Microscale Tracking of Surgical Instrument Motion

Riviere

Khosla

1999

Lecture Notes in Computer Science

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Abstract. An apparatus for accurate three-dimensional tracking of the tip of a microsurgical instrument has been developed for laboratory use. The system is useful for evaluation of microsurgical instrument designs and devices for accuracy enhancement (both robotic devices and active hand-held instruments), as well as for assessment and training of microsurgeons. It can also be used as a high-precision input interface to microsurgical simulators. The system involves illumination of the workspace and optical sensing of the position of a small reflective ball at the instrument tip, and therefore requires no wiring connection to the instrument being tracked. Sensing is performed by two position-sensitive photodiodes, placed orthogonally. The rms noise per coordinate is presently 7 microns. Preliminary results are presented. The photodiodes exhibit some degree of nonlinearity, which can be calibrated. The goal is to achieve an rms noise level of 1 micron. This is expected to be attainable via a synchronous detection scheme which has not yet been implemented.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microscale Tracking of Surgical Instrument Motion

Riviere

Khosla

1999

Lecture Notes in Computer Science

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Section: Introductionmentioning

confidence: 99%

“…2 Moreover, the PSD technique is not suitable as a linear-displacement ͑LD͒ sensor for measuring an object moving perpendicular to the surface of a plane on a submicrometer scale. 2 In this work, a magneto-optical ͑MO͒ method for the measurement of linear displacement is presented. The principle of this method is based on modulation of Faraday rotation due to domain-wall motion in a magneto-optic sensor film under the influence of ac and dc magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Magneto-optic linear-displacement sensor with high spatial resolution and low noise

Lee

Melikhov

Jiles

et al. 2006

Journal of Applied Physics

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A magneto-optic linear-displacement (MOLD) sensor is reported for measuring linear displacements of the surfaces of materials remotely. It is based on observation of temporal changes in the intensity of the reflected polarized light beam, which passes through a magneto-optic thin garnetfilm with controlled periodical displacement of one domain wall. The MOLD sensor allows observation of linear displacement of a material located remotely from the laser and detector with a spatial resolution of 4μm. A magneto-optic linear-displacement ͑MOLD͒ sensor is reported for measuring linear displacements of the surfaces of materials remotely. It is based on observation of temporal changes in the intensity of the reflected polarized light beam, which passes through a magneto-optic thin garnet film with controlled periodical displacement of one domain wall. The MOLD sensor allows observation of linear displacement of a material located remotely from the laser and detector with a spatial resolution of 4 m.

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A Vision-Based Navigation System for Perching Aircraft

Rao

2018

J Intell Robot Syst

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This paper presents the investigation of the use of position-sensing diode (PSD)-a light source direction sensor-for designing a vision-based navigation system for a perching aircraft. Aircraft perching maneuvers mimic bird's landing by climbing for touching down with low velocity or negligible impact. They are optimized to reduce their spatial requirements, like altitude gain or trajectory length. Due to disturbances and uncertainties, real-time perching is realized by tracking the optimal trajectories. As the performance of the controllers depends on the accuracy of estimated aircraft state, the use of PSD measurements as observations in the state estimation model is proposed to achieve precise landing. The performance and the suitability of this navigation system are investigated through numerical simulations. An optimal perching trajectory is computed by minimizing the trajectory length. Accelerations, angular-rates and PSD readings are determined from this trajectory and then added with experimentally obtained noise to create simulated sensor measurements. The initial state of the optimal perching trajectory is perturbed, and by assuming zero biases, extended Kalman filter is implemented for aircraft state estimation. It is shown that the errors between estimated and actual aircraft states reduce along the trajectory, validating the proposed navigation system.

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Accuracy of position detection using a position-sensitive detector

Cited by 26 publications

References 8 publications

Microscale Tracking of Surgical Instrument Motion

Microscale Tracking of Surgical Instrument Motion

Magneto-optic linear-displacement sensor with high spatial resolution and low noise

A Vision-Based Navigation System for Perching Aircraft

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