Multichannel Simultaneously Triggered Ultrasonic Ranging System by Optimized Chaotic Frequency Modulation Excitation Sequences

2012 ◽  
Vol 4 (4) ◽  
pp. 216-225
Author(s):  
Zhenjing Yao ◽  
Jingsong Yang
Keyword(s):  
Frequency Modulation ◽  
Ultrasonic Ranging ◽  
Modulation Excitation

Optimization of Matched Chaotic Frequency Modulation Excitation Sequences for Multichannel Simultaneously Triggered Ultrasonic Ranging System

2012 ◽  
Vol 4 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Zhen-Jing Yao ◽  
Tao Gao
Keyword(s):  
Frequency Modulation ◽  
Ultrasonic Sensors ◽  
Narrow Bandwidth ◽  
Correlation Characteristic ◽  
Ultrasonic Ranging ◽  
Working Together ◽  
Spectrum Matching ◽  
Nondominated Sorting ◽  
Lfm Excitation ◽  
Modulation Excitation

The matched spectrum and correlation characteristics are both important to realize the multichannel ultrasonic sensors working together. The spectrum matching can make full use of the bandwidth of the ultrasonic ranging system, and the good correlation characteristic can eliminate crosstalk among multichannel ultrasonic sensors triggering simultaneously. Linear frequency modulation (LFM) excitation sequences have been used as transmission signals for ultrasonic sensors. Due to the narrow bandwidth of the ultrasonic ranging system, the number of available LFM excitation sequences is limited. The chaotic frequency modulation (CFM) excitation sequences, which can generate more available excitation signals, are proposed in this paper. The nondominated sorting genetic algorithm-II is adopted to optimize both the spectrum and correlation characteristic of the CFM excitation sequences. After optimization, the CFM excitation sequences are spectrally matched to the ultrasonic ranging system as well as have best correlation characteristic. Real experiments have been implemented using an ultrasonic ranging system consisting of eight-channel SensComp 600 series electrostatic sensors excited with 2 ms CFM sequences. Experimental results show that spectra of the optimized CFM excitation sequences can match to the system and can work together without crosstalk.

Wideband dipole logging based on segment linear frequency modulation excitation

2018 ◽  
Vol 15 (2) ◽  
pp. 197-207
Author(s):  
Xue-Shen Cao ◽  
Hao Chen ◽  
Ping Li ◽  
Hong-Bin He ◽  
Yin-Qiu Zhou ◽  
...  
Keyword(s):  
Frequency Modulation ◽  
Linear Frequency Modulation ◽  
Linear Frequency ◽  
Modulation Excitation

Frequency modulation excitation spectroscopy

1982 ◽  
Vol 41 (5) ◽  
pp. 369-373 ◽  
Author(s):  
W. Lenth ◽  
C. Ortiz ◽  
G.C. Bjorklund
Keyword(s):  
Frequency Modulation ◽  
Modulation Excitation Spectroscopy ◽  
Modulation Excitation

Demonstration of 6-bit, 0.20-mVpp Quasi-Triangle Voltage Waveform Generator Based on Pulse-Frequency Modulation

2014 ◽  
Vol E97.C (3) ◽  
pp. 194-197 ◽  
Author(s):  
Yoshitaka TAKAHASHI ◽  
Hiroshi SHIMADA ◽  
Masaaki MAEZAWA ◽  
Yoshinao MIZUGAKI
Keyword(s):  
Frequency Modulation ◽  
Pulse Frequency ◽  
Waveform Generator ◽  
Voltage Waveform ◽  
Pulse Frequency Modulation
Sign in / Sign up

Export Citation Format

Share Document