Influence of Waveform Characteristics on LiDAR Ranging Accuracy and Precision

Li, Xiaolu; Yang, Bingwei; Xie, Xinhao; Li, Duan; Xu, Lijun

doi:10.3390/s18041156

Cited by 53 publications

(35 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Time-to-digital converters (TDCs) are vital components in numerous scientific applications, such as positron emission tomography (PET) [1][2][3][4][5][6], time-of-flight (ToF) image sensors [3][4][5][6][7], and light detection and ranging (LiDAR) [8][9][10]. Especially in ToF imaging and LiDAR applications, high-resolution TDCs affect overall performance.…”

Section: Introductionmentioning

confidence: 99%

Time Resolution Improvement Using Dual Delay Lines for Field-Programmable-Gate-Array-Based Time-to-Digital Converters with Real-Time Calibration

Chen

2018

Applied Sciences

View full text Add to dashboard Cite

This paper presents a time-to-digital converter (TDC) based on a field programmable gate array (FPGA) with a tapped delay line (TDL) architecture. This converter employs dual delay lines (DDLs) to enable real-time calibrations, and the proposed DDL-TDC measures the statistical distribution of delays to permit the calibration of nonuniform delay cells in FPGA-based TDC designs. DDLs are also used to set up alternate calibrations, thus enabling environmental effects to be immediately accounted for. Experimental results revealed that relative to a conventional TDL-TDC, the proposed DDL-TDC reduced the maximum differential nonlinearity by 26% and the integral nonlinearity by 30%. A root-mean-squared value of 32 ps was measured by inputting the constant delay source into the proposed DDL-TDC. The proposed scheme also maintained excellent linearity across a range of temperatures.

show abstract

Section: Introductionmentioning

confidence: 99%

Time Resolution Improvement Using Dual Delay Lines for Field-Programmable-Gate-Array-Based Time-to-Digital Converters with Real-Time Calibration

Chen

2018

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…This stress distribution can be approximately treated as an ellipse with tiny differences between the long axis and the minor axis. Hereby, determination of the ovality and formation of the three-dimensional visualization deformation nephogram are employed to indicate the radial deformation of the tunnel structure [33].…”

Section: Extraction Of Circular Tunnel Deformationmentioning

confidence: 99%

Automatic and Visual Processing Method of Non-Contact Monitoring for Circular Stormwater Sewage Tunnels Based on LiDAR Data

Xie

Zhao

et al. 2019

Energies

View full text Add to dashboard Cite

The application of Light Detection And Ranging (LiDAR) technology has become increasingly extensive in tunnel structure monitoring. The proposed processing method aims to carry out non-contact monitoring for circular stormwater sewage tunnels and provides an efficient workflow. This allows the automatic processing of raw point data and the acquisition of visualization results to analyze the health state of a tunnel within a short period of time. The proposed processing method employs a series of algorithms to extract the point cloud of a single tunnel segment without obvious noise by main three steps: axis acquisition, segment extraction, and denoising. The tunnel axis is extracted by fitting boundaries of the tunnel point cloud projection in the plane. With the guidance of the axis, the entire preprocessed tunnel point cloud is segmented by equal division to get a section of the tunnel point cloud which corresponds to a single tunnel segment. Then, the noise in every single point cloud segment is removed by clustering the algorithm twice, based on the distance and intensity. Finally, clean point clouds of tunnel segments are processed by an effective deformation extraction processor to determine the ovality and to get a three-dimensional visual deformation nephogram. The proposed method can significantly improve the efficiency of LiDAR data processing and extend the application of LiDAR technology in circular stormwater sewage tunnel monitoring.

show abstract

“…Far better results could be reached with a time of flight (ToF) distance sensor, which is typically used as a scanning device [12][13][14][15] rang finder [16][17][18] and gesture detection sensor [19]. The used VL53L0X module is capable of capturing distances up to a maximum range of 2 m with a very high accuracy.…”

Section: Combination Of the Sensorsmentioning

confidence: 99%

Development of a Sensor to Measure Physician Consultation Times

Gabl

Stummer

2019

Sensors

View full text Add to dashboard Cite

The duration of patient–physician contact is an important factor for the optimisation of treatment processes in healthcare systems. Available methods can be labour-intensive and the quality is, in many cases, poor. A part of this research project is to develop a sensor system, which allows the detection of people passing through a door, including the direction. For this purpose, two time of flight sensors are combined with a door sensor and a motion detection sensor (for redundancy) on one single side of the door frame. The period between two single measurements could be reduced to 50 ms, which allows the measurement of walking speed up to 2 ms − 1 . The accuracy of the time stamp for each event is less than one second and ensures a precise documentation of the consultation time. This paper presents the development of the sensor system, the miniaturisation of the installation and first measurement results, as well as the measurement’s concept of quality analysis, including multiple door applications. In future steps, the sensor system will be deployed at different medical practices to determine the exact duration of the patient–physician interaction over a longer time period.

show abstract

Influence of Waveform Characteristics on LiDAR Ranging Accuracy and Precision

Cited by 53 publications

References 20 publications

Time Resolution Improvement Using Dual Delay Lines for Field-Programmable-Gate-Array-Based Time-to-Digital Converters with Real-Time Calibration

Time Resolution Improvement Using Dual Delay Lines for Field-Programmable-Gate-Array-Based Time-to-Digital Converters with Real-Time Calibration

Automatic and Visual Processing Method of Non-Contact Monitoring for Circular Stormwater Sewage Tunnels Based on LiDAR Data

Development of a Sensor to Measure Physician Consultation Times

Contact Info

Product

Resources

About