Design and evaluation of an integrated scanning laser triangulation sensor

Schlarp, Johannes; Csencsics, Ernst; Schitter, Georg

doi:10.1016/j.mechatronics.2020.102453

Cited by 17 publications

(4 citation statements)

References 16 publications

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“…7 Active methods involve emitting an optical signal to interact with the object, while passive methods do not require such light emission. Noncontact optical techniques in orthodontics can further be classified into optical triangulation (OT), 8 parallel confocal (PC), 9 fringe projection profilometry (FPP), 10 and photogrammetry computer vision (PCV). 11 The OT system comprises a laser-based light source, a high-power lens, and an exceptionally sensitive sensor plate.…”

Section: Introductionmentioning

confidence: 99%

Position and posture measurement of stereo probes for dental implants with a four-camera vision system

Li,

Zhang

2024

Opt. Eng.

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.The fixed denture supported by multiple implants can effectively improve the retention and stability of traditional complete dentures, and greatly improve the masticatory ability and life quality of patients, which has been proven to be a reliable treatment method. However, how to accurately obtain the position and posture of multiple implants while the patient feels comfortable is still one of the main clinical difficulties. We design a four-camera system and propose its corresponding method, which accurately measures the position and posture of stereo probes (note that the stereo probes are finely screwed on the implants, i.e., the coordinate systems of the implants are transferred to the stereo probes). In the calibration, a ChArUco calibration board is introduced and the calibration parameters are derived utilizing the proposed three-stage calibration strategy. In the measurement, the stereo probes are screwed on the implants and captured by the four-camera system. Through Canny/Devernay method, the gauge points on the surface of the stereo probe can be solved. Subsequently, the decoding of the gauge points and stereo probes is achieved by the implementation of the proposed matching and decoding strategy. In addition, to achieve higher accuracy, a refinement approach under multiview for the position and posture of stereo probes is established. The result of the experiments verifies that our system and method have higher accuracy and effectiveness (note that the distance error between the two stereo probes is about 19 μm), which is entirely satisfactory for the application of digital implant impressions.

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Section: Introductionmentioning

confidence: 99%

Position and posture measurement of stereo probes for dental implants with a four-camera vision system

Li,

Zhang

2024

Opt. Eng.

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“…Therefore, contactless sensors are the preferred choice in today's industry. Time-of-flight [17], triangulation (1D, 2D, and 3D) [18], or classic RGB cameras image analysis [19] are the most commonly used methods. When using non-contact sensors, the measured object cannot be damaged in any way and the measurement is faster; sensors can sense several thousand points within milliseconds [20].…”

Section: Introductionmentioning

confidence: 99%

Finding the Optimal Pose of 2D LLT Sensors to Improve Object Pose Estimation

Heczko

Oščádal

Kot

et al. 2022

Sensors

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In this paper, we examine a method for improving pose estimation by correctly positioning the sensors relative to the scanned object. Three objects made of different materials and using different manufacturing technologies were selected for the experiment. To collect input data for orientation estimation, a simulation environment was created where each object was scanned at different poses. A simulation model of the laser line triangulation sensor was created for scanning, and the optical surface properties of the scanned objects were set to simulate real scanning conditions. The simulation was verified on a real system using the UR10e robot to rotate and move the object. The presented results show that the simulation matches the real measurements and that the appropriate placement of the sensors has improved the orientation estimation.

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“…Mechatronic systems engineering is also relevant to many sensor systems. The papers [5,6] are concerned with the mechatronic design, optimization and control of optical sensors. In particular, Schlarp et al [5] presents the mechatronic design and control of an optical scanning laser sensor with the application to 3D imaging.…”

mentioning

confidence: 99%

“…The papers [5,6] are concerned with the mechatronic design, optimization and control of optical sensors. In particular, Schlarp et al [5] presents the mechatronic design and control of an optical scanning laser sensor with the application to 3D imaging. The core of this system is a compact fast steering mirror which, together with a laser source and a detector, allows to reconstruct the 3D geometry of objects.…”

mentioning

confidence: 99%