An Optical Signal Processing Technique for Directional Systems Using Circular Arrays

1970 ◽  
Vol 17 (1) ◽  
pp. 19-36 ◽  
Keyword(s):  
Signal Processing ◽  
Optical Signal Processing ◽  
Optical Signal ◽  
Processing Technique ◽  
Signal Processing Technique ◽  
Circular Arrays

All-optical signal processing technique for secure optical communication

2015 ◽  
Author(s):  
Feng-chen Qian ◽  
Bing Su ◽  
Ya-lin Ye ◽  
Qian Zhang ◽  
Shao-feng Lin ◽  
...  
Keyword(s):  
Signal Processing ◽  
Optical Communication ◽  
Optical Signal Processing ◽  
Optical Signal ◽  
Processing Technique ◽  
Signal Processing Technique ◽  
All Optical

Optical Signal Processing Using Nonlinear Period-One Dynamics of Semiconductor Lasers

2014 ◽  
Vol 1 ◽  
pp. 462-465
Author(s):  
Sheng-Kwang Hwang ◽  
Sze-Chun Chan ◽  
Yu-Han Hung ◽  
Shiuan-Li Lin ◽  
Cheng-Hao Chu
Keyword(s):  
Signal Processing ◽  
Semiconductor Lasers ◽  
Optical Signal Processing ◽  
Optical Signal

Micro-Structured Materials for Generation of Coherent Light and Optical Signal Processing

2008 ◽  
Author(s):  
M. M. Fejer ◽  
R. K. Route ◽  
M. Charbonneau-Lefort ◽  
J. Huang ◽  
D. Hum ◽  
...  
Keyword(s):  
Signal Processing ◽  
Optical Signal Processing ◽  
Optical Signal ◽  
Coherent Light ◽  
Structured Materials

scholarly journals A Remote Sensor System Based on TDLAS Technique for Ammonia Leakage Monitoring

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2448
Author(s):  
Hongbin Lu ◽  
Chuantao Zheng ◽  
Lei Zhang ◽  
Zhiwei Liu ◽  
Fang Song ◽  
...  
Keyword(s):  
Signal Processing ◽  
Limit Of Detection ◽  
Processing Technique ◽  
Tunable Diode Laser ◽  
Sensor System ◽  
Signal Processing Technique ◽  
Suppression Effect ◽  
Output Wavelength ◽  
Deviation Analysis ◽  
Remote Sensor

The development of an efficient, portable, real-time, and high-precision ammonia (NH3) remote sensor system is of great significance for environmental protection and citizens’ health. We developed a NH3 remote sensor system based on tunable diode laser absorption spectroscopy (TDLAS) technique to measure the NH3 leakage. In order to eliminate the interference of water vapor on NH3 detection, the wavelength-locked wavelength modulation spectroscopy technique was adopted to stabilize the output wavelength of the laser at 6612.7 cm−1, which significantly increased the sampling frequency of the sensor system. To solve the problem in that the light intensity received by the detector keeps changing, the 2f/1f signal processing technique was adopted. The practical application results proved that the 2f/1f signal processing technique had a satisfactory suppression effect on the signal fluctuation caused by distance changing. Using Allan deviation analysis, we determined the stability and limit of detection (LoD). The system could reach a LoD of 16.6 ppm·m at an average time of 2.8 s, and a LoD of 0.5 ppm·m at an optimum averaging time of 778.4 s. Finally, the measurement result of simulated ammonia leakage verified that the ammonia remote sensor system could meet the need for ammonia leakage detection in the industrial production process.

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