scholarly journals EXPERIMENTAL IDENTIFICATION OF SENSITIVITY OF TILT SENSOR

2019 ◽  
pp. 114-120
Author(s):  
Michal Kelemen
Keyword(s):  
Tilt Angle ◽  
Pulse Width ◽  
Output Pulse ◽  
Angle Sensor ◽  
Target Setting ◽  
Sensing System ◽  
Zero Shift ◽  
Sensor Properties ◽  
Tilt Sensor ◽  
Is Value

Urgency of the research. Robots and vehicles which locomote on high slope ground has tendency to overturning and they lost stability during the locomotion. The problem also occurs in area of automotive industry. Target setting. All vehicles moving on the rough and inclined ground has a problem with stability. Emergency system for warning before dangerous tilt angle can be mounted inside the vehicles and robots as prevention of side overturning. Actual scientific researches and issues analysis. The problem is to find the reliable sensor for detection of dangerous tilt angle. Task is to identify the sensor properties as sensitivity, zero shift and also uncertainty of measurement. Before using it is necessary to identify sensor properties. Uninvestigated parts of general matters defining. The questions of the filtering of data acquisition by tilt angle sensor are uninvestigated, because the next research will be focused to this topic. The research objective. Sine bar is used for verification and testing of tilt sensor. Sine bar angle is adjusted using the parallel length gauge blocks. Sensor reacts to the changed tilt angle proportionally with pulse width on output pulse width signal. Indication of sensed data is made via using the microcontroller and LCD display. Also all calculations are executed inside the microcontroller. The statement of basic materials. The tilt sensor can be mounted inside the problematic vehicles to detect dangerous tilt angle and also automatic system for change the center of gravity position can be designed. The system will compensate the dangerous tilt angle. Conclusions. Evaluated uncertainties are related to overall sensing system and not only for sensor. Only sensor alone cannot be tested, because the sensor has no indication module. Expanded uncertainty of the system for measurement of tilt has been obtained and it is value should be taken into account before the sensor using.

Mode-locked ring laser with output pulse width of 0.4 ps

1999 ◽  
Vol 48 (6) ◽  
pp. 1018-1022 ◽  
Author(s):  
K. Kuroda ◽  
H. Takakura
Keyword(s):  
Pulse Width ◽  
Ring Laser ◽  
Output Pulse

The Study of Four-Position North Seeking System under Vibration Environment

2014 ◽  
Vol 668-669 ◽  
pp. 990-993
Author(s):  
Ming Hui Zong ◽  
Deng Hua Li
Keyword(s):  
Fiber Optic ◽  
Reference Signal ◽  
Vibration Signal ◽  
Pi Controller ◽  
Angle Sensor ◽  
The North ◽  
External Reference ◽  
Tilt Sensor ◽  
The Relationship ◽  
Better Than

In order to develop north seeking system with strong anti-interference ability, the influence caused by the swaying base on the performance of north seeker was investigated. The influence of sinusoidal signal of gyros and tilt sensor's output was analyzed based on four-position north seeking system which was consisted of a single axis gyro and a tilt sensor. Fiber optic gyros and tilt sensor are interference by the same vibration signal, according to the relationship between the output signal of gyro and the angle sensor, a PI controller was designed to compensate the gyro's output error. This real time compensation can effectively improve the north seeking accuracy and speed without complicated calculation or external reference signal. The north seeking accuracy is better than 0.03o. Simulation and actual north seeking result proved that this method significantly improves the north seeking performance in vibrant environment.

scholarly journals A Robust Two-axis Tilt Angle Sensor Based on Air/Liquid Two-phase Dielectric Capacitive Sensing Structure

2018 ◽  
Vol 66 (5) ◽  
pp. 685-696 ◽  
Author(s):  
Ha Tran Thi Thuy ◽  
Tiep Dang Dinh ◽  
Tuan Vu Quoc ◽  
Thinh Pham Quoc ◽  
Masahiro Aoyagi ◽  
...  
Keyword(s):  
Tilt Angle ◽  
Capacitive Sensing ◽  
Two Phase ◽  
Angle Sensor

Flow Similarity Applied in Convection-Based Tilt Sensor

2007 ◽  
Author(s):  
Shiliu Peng ◽  
Yonghong Zheng
Keyword(s):  
Heat Source ◽  
Temperature Difference ◽  
Tilt Angle ◽  
Temperature Drift ◽  
Perpendicular Line ◽  
Environment Temperature ◽  
Tilt Sensor ◽  
Line Cross ◽  
Flow Similarity ◽  
Tilt Sensors

The environment temperature has inevitable effects on property of the convection-based tilt sensors. It not only redefines the application, but also prevents the improvement of the sensor performance. Numerical simulation of the fluid flow in the chamber of a sensor was performed and the influence of the environment temperature was studied in this paper. At zero tilt angle, the temperature distribution along the perpendicular line cross the heat source at various environment temperatures was presented. It was found that the flow varied dramatically at different environment temperatures, which would cause the output signal vary accordingly, even when the tilt angle was kept at a constant, because this device works by sensing the change of flow. At the same condition, we present the numerical results when the temperature difference across the heat source and the environment was kept at the same, in those results, it was found that the temperature difference at every point along the perpendicular line cross the heat source keep the same, this result confirms the similarity principle of nature convection. Second, A method of eliminating environment temperature infect on property of convection-based tilt sensor, which is based on the theory of flow similarity, is proposed. It was found that a thermal transistance can be piped on the circuit of heat source to compensate the temperature of the heat source. A compensative circuit was specially designed which can keep flow similarity by changing heat source temperature in order to eliminate the influence of environment temperature. The experiment results show that above 70% temperature drift can be eliminated by this compensative circuit.

PWM Chopper of Ultrasonic Power Supply Based on FPGA

2012 ◽  
Vol 476-478 ◽  
pp. 1305-1308
Author(s):  
Chun Feng Sun ◽  
Wei Guang Zhang
Keyword(s):  
Power Supply ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Output Pulse ◽  
Open Loop ◽  
Control Circuit ◽  
Ultrasonic Power ◽  
Pwm Control ◽  
Power Regulation ◽  
Regulation Method

Pulse width modulation (PWM) is often one of the important power regulation method of ultrasonic power supply. The traditional PWM control circuit has the shortcomings of complex design structure, slow dynamic response and low reliability. An advanced PWM technique for choppers of ultrasonic power supply based on FPGA is proposed. Through open-loop operation, it regulates the output pulse width of ultrasonic power supply dynamically. The simulation result shows that the PWM control circuit based on FPGA can realize to adjust the width of PWM signal and power regulation conveniently.

scholarly journals Symmetry Two-axis Tilt Angle Capacitive Sensor System

2019 ◽  
Vol 35 (2) ◽  
Author(s):  
Tran Thi Thuy Ha ◽  
Nguyen Dac Hai ◽  
Bui Thanh Tung
Keyword(s):  
Tilt Angle ◽  
Printed Circuit Board ◽  
Capacitive Sensor ◽  
Dielectric Medium ◽  
Circuit Board ◽  
Sensor System ◽  
Angle Sensor ◽  
Printed Circuit ◽  
Measurement Results ◽  
3D Printed

Abstract: This paper presents the design, fabrication and operation of a highly symmetrical two-axis capacitive sensor. The proposed sensor consists of five electrodes, including of an excitation electrode and two pairs of sensing electrodes with exactly the same dimensions, arranged at identified symmetrically locations on a 3D printed hollow sphere, which containing dielectric medium formed by the partly filled oil and the remaining air. The proposed sensor can measure the tilt angle about the x-axis and y-axis with symmetrical outputs. The proposed sensor is fabricated using a rapid prototyping technology and mounted on the surface of a printed circuit board (PCB) for mechanical packaging and signal processing. Experimental measurement results show that the sensor system can measure the tilt angle in both the x- and y-axis with sensitivity of 103 mV/degree and resolution of ±1 degree in the range of -30 degree to +30 degree. This sensor system can be used in many military and consumer applications. Keywords: Capacitive sensor, Fluidic sensor, Two-axis tilt angle sensor.

scholarly journals Research on a novel magnetic tilt sensor designed using Hall elements and ferrofluid

2019 ◽  
Vol 70 (5) ◽  
pp. 406-411
Author(s):  
Yavuz Öztürk ◽  
Ismail Yariçi
Keyword(s):  
Magnetic Field ◽  
Hall Effect ◽  
Tilt Angle ◽  
Face To Face ◽  
Restoring Forces ◽  
Working Principle ◽  
Tilt Sensor ◽  
Hall Effect Sensors ◽  
Two Sides ◽  
The Magnetic Field

Abstract In this study, a simple, adjustable, bidirectional tilt sensor was designed using a pair of linear Hall effect sensors and magnets. Theoretical analysis and experimental results of the sensor system were presented. The working principle of the designed sensor is based on sensing the magnetic field of a mobile magnet which displaces with respect to the tilt angle. Two magnet sets were placed at the two ends of the system to apply repulsive restoring forces on the mobile magnet. The mobile magnet was coated with a light hydrocarbon based ferrofluid as a lubricant to reduce friction. Fixed Hall effect sensors were placed face to face at the two sides of the mobile magnet to monitor the magnetic field of the mobile magnet. It was shown that both experimentally and theoretically, it is possible to measure the approximate tilt angle linearly and quadratically by calculating the sum and difference of the Hall sensor voltages for the relatively small movements of the mobile magnet. Moreover, the system was also examined for the different sets of side magnets. For three different side magnet configurations, approximately 0.7, 1.1 and 1.68 V/rad sensitivity values were observed in the linear range.

Capacitive Tilt Sensor Using Metallic Ball

2009 ◽  
Author(s):  
Chang Hwa Lee ◽  
Seung S. Lee
Keyword(s):  
Contact Problem ◽  
Linear Relationship ◽  
Tilt Angle ◽  
Linear Displacement ◽  
Fabrication Process ◽  
Capacitive Sensing ◽  
Plate Spacing ◽  
Polystyrene Tube ◽  
Tilt Sensor ◽  
Test Result

A new capacitive type of tilt sensor using metallic ball is proposed primarily to get over the contact problem in measurement of tilt angle. Its structure and fabrication process are simpler than other previous sensors. Capacitive sensing type has many advantages such as simplicity, non-contact measurement of angle, long-throw linear displacement, and sub-micron plate spacing comparing to other types. The dimension of this prototype sensor is 20mm × 20mm and the diameter of the polystyrene tube is 5mm and the thickness of the tube is 0.15mm. The test result shows the linear relationship between tilt angles and capacitances.

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