scholarly journals Fabrication of Three-Dimensional Position-Measurement Sensor Using a Single-Axis Coil

2004 ◽  
Vol 28 (2) ◽  
pp. 97-101
Author(s):  
T. Nagaoka ◽  
A. Uchiyama
Keyword(s):  
Three Dimensional ◽  
Position Measurement ◽  
Measurement Sensor

Research on Three-Dimensional Displacement Measurement Technology of the Beating Heart

2011 ◽  
Vol 403-408 ◽  
pp. 5182-5186
Author(s):  
Sheng Yi Yang ◽  
An Gu ◽  
Meng Li ◽  
Chang Jian Lu
Keyword(s):  
Heart Surgery ◽  
Classical Mechanics ◽  
Three Dimensional ◽  
Beating Heart ◽  
Displacement Measurement ◽  
Surgical Instruments ◽  
Analytical Models ◽  
Measurement Technology ◽  
Position Measurement ◽  
Mechanics Of Materials

In robotic-assisted heart surgery, the method of canceling the relative motion between the surgical site on the heart and the surgical instruments was introduced in this paper. A whisker sensor was designed for three dimensional position measurement in beating heart surgery. Analytical models were developed according to the classical mechanics of materials, and theoretical formulas were derived for displacement measurement. Feasibility and effectiveness of the method were verified by simulation experiments. We can obtain measurements by loading displacement to the whisker sensor, and draw conclusions by comparing the measurements.

An Acoustic System for Pipeline Profile Measurement

1983 ◽  
Vol 105 (4) ◽  
pp. 475-479
Author(s):  
H. Van Calcar
Keyword(s):  
Measurement Technique ◽  
Measurement System ◽  
Performance Enhancement ◽  
Three Dimensional ◽  
Profile Measurement ◽  
Baseline Measurement ◽  
Acoustic System ◽  
Position Measurement ◽  
Long Baseline ◽  
Hardware Configuration

This paper presents an acoustic position measurement system used for precise three-dimensional flowline profile measurement. The system measures several points along the flowline using the long-baseline measurement technique and augments this measurement with depth telemetry repeaters to maintain elevation accuracy throughout the changing installation geometry. The paper discusses both the measurement system and the performance enhancement features. The paper concludes with a discussion of the hardware configuration and the accuracy that can be expected when the technique is extended into deeper operating areas.

Compensation of Measurement Precision for Three-Dimensional Position Measurement Device Based on Disturbance Observer

2011 ◽  
Vol 23 (1) ◽  
pp. 75-82
Author(s):  
Toshiaki Matsumoto ◽  
◽  
Satoru Takahashi
Keyword(s):  
Control System ◽  
Control Systems ◽  
Disturbance Observer ◽  
Three Dimensional ◽  
Measurement Precision ◽  
Significant Issue ◽  
Position Measurement ◽  
Positioning Precision ◽  
Unknown Disturbances ◽  
Series Of Experiments

Improvements in measurement precision will constitute a significant issue in designing control systems formeasurement devices. Specifically, positioning precision may be decreased if unpredicted disturbances from the environment are not taken into account. In this paper, we first estimate unknown disturbances based on the disturbance observer, then design control systems which can reduce the effects of such disturbances to propose a control system capable of compensating for any decreases in measurement precision due to such disturbances, and finally demonstrate the effectiveness of the proposed control system through a series of experiments.

MEASUREMENT OF THE SURFACE CONDITION OF A THERMALLY SPRAYED MATERIAL AND ITS THREE-DIMENSIONAL POSITION USING A LASER RANGEFINDER

2008 ◽  
Vol 22 (11) ◽  
pp. 887-892
Author(s):  
KOZO OHTANI ◽  
YOSHIKO SHINHARA ◽  
MITSUO KIDO ◽  
MITSURU BABA
Keyword(s):  
Control Function ◽  
Incident Angle ◽  
Surface Condition ◽  
Three Dimensional ◽  
Image Sensor ◽  
Prototype System ◽  
Laser Rangefinder ◽  
Position Measurement ◽  
Wide Range ◽  
Thermally Sprayed

This paper describes that a measurement method for the surface condition of a thermally sprayed object and its three dimensional position with a laser rangefinder. The feature of this rangefinder is to equip an image sensor which has the ability of simultaneously detecting the position of a light and the incident angle onto the sensor. Moreover, the sensor has an autonomous exposure time control function. Therefore, our laser rangefinder can detect the 3D positions of an object with unknown reflectance. We constructed the prototype system and did some experiments to verify the proposed method. The error of the 3D position measurement was Δ z / z =0.7%. As concerns the detection of the surface condition, we could identify three types of surface roughness of a measured object with accuracy. The proposed method has great potential for a wide range of industrial inspections.

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