Design of Distance Measuring System Based on MEMS Accelerometer

2019 ◽  
Vol 14 (4) ◽  
pp. 1675-1682
Author(s):  
Lei Xu ◽  
Liqing Fang ◽  
Chunsheng Lin ◽  
Deqing Guo ◽  
Ziyuan Qi ◽  
...  
Keyword(s):  
Measuring System ◽  
Mems Accelerometer ◽  
Distance Measuring

scholarly journals Displacement Estimation Based on Optical and Inertial Sensor Fusion

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1390
Author(s):  
Tomasz Ursel ◽  
Michał Olinski
Keyword(s):  
Sensor Fusion ◽  
Inertial Sensor ◽  
External Disturbance ◽  
Linear Displacement ◽  
Measuring System ◽  
Displacement Estimation ◽  
Mems Accelerometer ◽  
Pedestrian Navigation ◽  
Complementary Filter ◽  
Optical Flow Sensor

This article aims to develop a system capable of estimating the displacement of a moving object with the usage of a relatively cheap and easy to apply sensors. There is a growing need for such systems, not only for robots, but also, for instance, pedestrian navigation. In this paper, the theory for this idea, including data postprocessing algorithms for a MEMS accelerometer and an optical flow sensor (OFS), as well as the developed complementary filter applied for sensor fusion, are presented. In addition, a vital part of the accelerometer’s algorithm, the zero velocity states detection, is implemented. It is based on analysis of the acceleration’s signal and further application of acceleration symmetrization, greatly improving the obtained displacement. A test stand with a linear guide and motor enabling imposing a specified linear motion is built. The results of both sensors’ testing suggest that the displacement estimated by each of them is highly correct. Fusion of the sensors’ data gives even better outcomes, especially in cases with external disturbance of OFS. The comparative evaluation of estimated linear displacements, in each case related to encoder data, confirms the algorithms’ operation correctness and proves the chosen sensors’ usefulness in the development of a linear displacement measuring system.

An inexpensive microwave distance measuring system

1993 ◽  
Vol 6 (5) ◽  
pp. 287-292 ◽  
Author(s):  
David A. Noon ◽  
Marek E. Bialkowski
Keyword(s):  
Measuring System ◽  
Distance Measuring

Ultrasonic Ranging System Based on Single Chip Microprocessor

2013 ◽  
Vol 441 ◽  
pp. 360-363
Author(s):  
Xian Cheng Fu ◽  
Lei Zhou ◽  
Guo Jun Wen
Keyword(s):  
Ultrasonic Wave ◽  
Lower Price ◽  
Measuring System ◽  
Single Chip ◽  
Combined System ◽  
Display Module ◽  
General Plan ◽  
Ultrasonic Ranging ◽  
The Cost ◽  
Distance Measuring

Ultrasonic ranging (UR) technology has being used widely in many industries around the world. This paper aims to design and manufacture an ultrasonic distance measuring system with lower price and higher accuracy. Based on the deep study of principle of ultrasonic ranging, we designed the general plan and detailed electrical circuits for the ultrasonic distance measuring system based on single chip microprocessor of AT89S52, including the transmitter module of ultrasonic wave, receiving module of ultrasonic wave, display module etc. Then, we compiled the relative driven programs for all modules. After that, we debugged the combined system of hardware and software system. At last, the experimental results show that the cost is about 300RMB for 3 prototypes, measuring rang is 0.16~1.5m with the accuracy of 0.001mm, which means the ranging system meets the design requirements of lower price and higher accuracy.

Intelligent Robot Obstacle Avoidance Perception Method Using a High-Precision Laser Distance Measuring System

2021 ◽  
Vol 16 (3) ◽  
pp. 471-478
Author(s):  
Yuzhou Liu
Keyword(s):  
Mobile Robots ◽  
Real Time ◽  
Obstacle Avoidance ◽  
High Precision ◽  
Large Scale ◽  
Measuring System ◽  
Channel Modulation ◽  
Avoidance Control ◽  
Modulation Signal ◽  
Distance Measuring

Laser distance measuring is increasingly used in large-scale and real-time scanning measurement, including three-dimensional map construction, size measurement of large-scale buildings, and real-time surface information acquisition. Therefore, there are high-precision and high-efficiency requirements for the laser distance measuring system. Based on the phase laser distance measuring, a laser parallel distance measuring system is proposed as per the frequency division multiplexer principle. The system uses multi-channel modulation signals with different frequencies to drive multiple lasers to emit light intensity in parallel, and then the light wave is measured according to the change of the modulation signal. The single-channel modulation signal adopts the multi-scale composite wave to eliminate the uncertainty of the whole wavelength by using the combination of two scales and distance measurement. The multiple echo signals after diffuse reflection of the measured target are mixed and received by the same photodetector and go through signal amplification, clutter filtering, etc., and then are sent to the mixing unit together with the reference signal, followed by down-frequency processing, with the effective signal obtained through the low-frequency filter. In the experiment, the laser distance measuring system is used for obstacle avoidance control of mobile robots, and fuzzy control is used to design the corresponding obstacle avoidance controller. The robot lateral deviation and heading angle are used as the input of the fuzzy controller, and the track variation is the output. The test verifies that the obstacle avoidance control is effective, that is, the laser distance measuring system designed in this research can be used for the obstacle avoidance control of mobile robots.

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