Low-Cost Ultrasonic Distance Sensor Arrays with Networked Error Correction

Dai, Hongjun; Zhao, Shulin; Jia, Zhiping; Chen, Tianzhou

doi:10.3390/s130911818

Cited by 5 publications

(4 citation statements)

References 29 publications

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“…The distance measurement of the TOF technique is based on Reference [12], S=ct/2 where S is the distance between the measurement spot and the obstacle; c is the speed of sound; and t is the return time between the emitter and obstacle.…”

Section: Influencing Factors On Obstacle Distance Measurementmentioning

confidence: 99%

A Guided Vehicle under Fire Conditions Based on a Modified Ultrasonic Obstacle Avoidance Technology

Feng

Liang

et al. 2018

Sensors

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Low visibility and hot smoke environment under fire conditions can largely hamper the related fire rescue processes. Ultrasound obstacle avoidance technology is then useful for guidance. However, the biggest challenge of adopting ultrasound technology comes from accurate distance measurements under the disturbances of high temperature and soot particle concentration. It is critical to measure the propagation speed under the complicated fire conditions. Therefore, in this study, a baffle calibration method was proposed to improve the accuracy of distance measurement of an obstacle. The method is based on two ultrasound measurement systems, while one is used to calibrate the propagation speed of ultrasound based on the fixed distanced baffle and the other is for the dynamic measurement of obstacle distance based on the calibrated speed. The viability of this method on the guided vehicle was confirmed based on the experiments. From its comparison to those existing methods, such as constant speed and temperature compensation methods, it was known from that the proposed baffle calibration method provides the best prediction. It was obtained that the maximum errors based on the baffle calibration method are 2.75% and 2.62% under the two representative fire scenarios, respectively, which are much lower than those of constant speed (7.81% and 8.4%) and temperature compensation methods (10.4% and 5.12%).

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Section: Influencing Factors On Obstacle Distance Measurementmentioning

confidence: 99%

A Guided Vehicle under Fire Conditions Based on a Modified Ultrasonic Obstacle Avoidance Technology

Feng

Liang

et al. 2018

Sensors

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“…The performance of the ultrasonic module with 4 units was not acceptable from the initial tests. Based on a literature review, however, accuracy improvement was expected to be enhanced through the increased number of the modules and their layout [25] . The number of the modules was increased to 12 and 20.…”

Section: Figure 1 Schematic Diagram Of the Tech Bench Constructed Formentioning

confidence: 99%

Grain flow rate sensing for a 55 kW full-feed type multi-purpose combine

Choi¹,

Lee²,

Jang³

et al. 2018

International Journal of Agricultural and Biological Engineering

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Real time sensing of crop yield is critical for a successful implementation of precision agriculture. Yield monitoring system is an optional component of a 55 kW multipurpose combine harvester, developed in Korea, for both domestic and global markets, especially Asian countries where field sizes are relatively small. The aim of the present study was to fabricate and evaluate the performance of a grain flow sensor suitable to the mid-sized full-feed type combine for rice, soybean, and barley. Firstly, commercially available non-contact type sensing modules (optical, ultrasonic, laser, and microwave modules) were chosen for alternative candidates, to be further tested in a laboratory bench. Through the laboratory tests, the ultrasonic module was selected as a potential approach and the performance was improved by increasing the number of modules and their layout. Finally, the improved grain flow sensor was evaluated during field harvesting operation. Field tests with the improved grain flow sensor showed a good potential for rice (R 2 =0.85, RMSE=126.14 g/s), soybean (R 2 =0.78, RMSE=43.87 g/s), and barley (R 2 =0.83, RMSE=37.39 g/s). Further research would be necessary for improvement and commercialization, through various signal processing and field tests under different field and crop conditions.

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“…Nodes follow a neighbor discovery wakeup schedule that defines the time pattern required to wake up or sleep, so that nodes in the network can discover their respective neighbors in an energy-efficient manner. Neighboring nodes share common neighbors by using many techniques [ 13 , 14 ]. If nodes broadcast their two-hop neighbor tables in active slots, a node can indirectly discover its new neighbors through a direct rendezvous with assistance from the already discovered neighbor.…”

Section: Literature Reviewmentioning

confidence: 99%

Handling Neighbor Discovery and Rendezvous Consistency with Weighted Quorum-Based Approach

Own

Meng

Liu

2015

Sensors

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Neighbor discovery and the power of sensors play an important role in the formation of Wireless Sensor Networks (WSNs) and mobile networks. Many asynchronous protocols based on wake-up time scheduling have been proposed to enable neighbor discovery among neighboring nodes for the energy saving, especially in the difficulty of clock synchronization. However, existing researches are divided two parts with the neighbor-discovery methods, one is the quorum-based protocols and the other is co-primality based protocols. Their distinction is on the arrangements of time slots, the former uses the quorums in the matrix, the latter adopts the numerical analysis. In our study, we propose the weighted heuristic quorum system (WQS), which is based on the quorum algorithm to eliminate redundant paths of active slots. We demonstrate the specification of our system: fewer active slots are required, the referring rate is balanced, and remaining power is considered particularly when a device maintains rendezvous with discovered neighbors. The evaluation results showed that our proposed method can effectively reschedule the active slots and save the computing time of the network system.

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Low-Cost Ultrasonic Distance Sensor Arrays with Networked Error Correction

Cited by 5 publications

References 29 publications

A Guided Vehicle under Fire Conditions Based on a Modified Ultrasonic Obstacle Avoidance Technology

A Guided Vehicle under Fire Conditions Based on a Modified Ultrasonic Obstacle Avoidance Technology

Grain flow rate sensing for a 55 kW full-feed type multi-purpose combine

Handling Neighbor Discovery and Rendezvous Consistency with Weighted Quorum-Based Approach

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