White LED-based visible light ranging and detecting system
In this project, another application of light emitting diodes (LEDs) is explored, which is a ranging and detecting system. This project aims to carry out experimental work on the theory explained below. The theoretical process is as follows: a predetermined sinusoid signal at a fixed frequency i...
| Main Author: | |
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| Other Authors: | |
| Format: | Final Year Project (FYP) |
| Language: | English |
| Published: |
2016
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/68280 |
| _version_ | 1811691366812483584 |
|---|---|
| author | Li, Xiang |
| author2 | Zhong Wende |
| author_facet | Zhong Wende Li, Xiang |
| author_sort | Li, Xiang |
| collection | NTU |
| description | In this project, another application of light emitting diodes (LEDs) is explored, which
is a ranging and detecting system. This project aims to carry out experimental work on
the theory explained below.
The theoretical process is as follows: a predetermined sinusoid signal at a fixed
frequency is intensity modulated on LED light source. By comparing the detected
signal reflected from the object with the original signal, a phase shift can be obtained.
The travel distance of the light can then be decided based on the calculation of this
phase shift.
Applying the theory, I tried to measure the exact distance from the lighting source to
the object in front of it. After many experiments and failures, an optimal setting is
found that could sense stable phase shifts, as well as reduce the measurement error to
a reasonable range.
An automation software program is developed using National Instruments’s
LabVIEW. The program could automatically obtain the original and received signals,
process them, measure the phase shifts, averaging in order to reduce error, and lastly
calculate the distance.
Factors that affect the measurement accuracy are also analyzed in this report. These
include modulated signal’s frequency and amplitude, Oscilloscope’s sampling rate,
sample capacity, post signal amplification rate, receiver’s sensitivity, receiver’s
detecting area and filter’s bandwidth. These findings could be a solid groundwork for
future researches.
Accuracy of this system is also explored. If object is placed within a short distance
away from receiver, the precision is very good – relative error is as low as 1.58%. Plots
showing the relationship between distance and measurement error are also shown in
this report. |
| first_indexed | 2024-10-01T06:18:45Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/68280 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:18:45Z |
| publishDate | 2016 |
| record_format | dspace |
| spelling | ntu-10356/682802023-07-07T16:09:34Z White LED-based visible light ranging and detecting system Li, Xiang Zhong Wende School of Electrical and Electronic Engineering DRNTU::Engineering::Electrical and electronic engineering::Wireless communication systems In this project, another application of light emitting diodes (LEDs) is explored, which is a ranging and detecting system. This project aims to carry out experimental work on the theory explained below. The theoretical process is as follows: a predetermined sinusoid signal at a fixed frequency is intensity modulated on LED light source. By comparing the detected signal reflected from the object with the original signal, a phase shift can be obtained. The travel distance of the light can then be decided based on the calculation of this phase shift. Applying the theory, I tried to measure the exact distance from the lighting source to the object in front of it. After many experiments and failures, an optimal setting is found that could sense stable phase shifts, as well as reduce the measurement error to a reasonable range. An automation software program is developed using National Instruments’s LabVIEW. The program could automatically obtain the original and received signals, process them, measure the phase shifts, averaging in order to reduce error, and lastly calculate the distance. Factors that affect the measurement accuracy are also analyzed in this report. These include modulated signal’s frequency and amplitude, Oscilloscope’s sampling rate, sample capacity, post signal amplification rate, receiver’s sensitivity, receiver’s detecting area and filter’s bandwidth. These findings could be a solid groundwork for future researches. Accuracy of this system is also explored. If object is placed within a short distance away from receiver, the precision is very good – relative error is as low as 1.58%. Plots showing the relationship between distance and measurement error are also shown in this report. Bachelor of Engineering 2016-05-25T04:58:32Z 2016-05-25T04:58:32Z 2016 Final Year Project (FYP) http://hdl.handle.net/10356/68280 en Nanyang Technological University 46 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Electrical and electronic engineering::Wireless communication systems Li, Xiang White LED-based visible light ranging and detecting system |
| title | White LED-based visible light ranging and detecting system |
| title_full | White LED-based visible light ranging and detecting system |
| title_fullStr | White LED-based visible light ranging and detecting system |
| title_full_unstemmed | White LED-based visible light ranging and detecting system |
| title_short | White LED-based visible light ranging and detecting system |
| title_sort | white led based visible light ranging and detecting system |
| topic | DRNTU::Engineering::Electrical and electronic engineering::Wireless communication systems |
| url | http://hdl.handle.net/10356/68280 |
| work_keys_str_mv | AT lixiang whiteledbasedvisiblelightranginganddetectingsystem |