Design of dual-phase lock-in amplifier used for weak signal detection

2016 ◽  
Author(s):  
Chao Qi ◽  
Yiyi Huang ◽  
Wensheng Zhang ◽  
Di Zhou ◽  
Yanmin Wang ◽  
...  
Keyword(s):  
Signal Detection ◽  
Dual Phase ◽  
Weak Signal ◽  
Weak Signal Detection ◽  
Phase Lock ◽  
Lock In

Weak Signal Detection System Based on Lock-in Amplifier Technology

2013 ◽  
Vol 389 ◽  
pp. 489-493
Author(s):  
Yong Lv ◽  
Chun Hui Niu ◽  
Yue Qiang Li ◽  
Qing Shan Chen ◽  
Xiao Ying Li ◽  
...  
Keyword(s):  
Signal Detection ◽  
Detection System ◽  
Signal To Noise Ratio ◽  
Weak Signal ◽  
Weak Signal Detection ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
Phase Sensitive ◽  
Lock In

In order to detect the weak signal deeply buried in the noise, a weak signal detection system based on lock-in amplifier is proposed. The system includes the preamplifier circuit, active low pass filter circuit, AC amplifying circuit and phase sensitive demodulation circuit. Test results show that it can greatly increase the signal-to-noise ratio (SNR) up to 12.7db.

scholarly journals Circular Regression in a Dual-Phase Lock-In Amplifier for Coherent Detection of Weak Signal

Sensors ◽  
2017 ◽  
Vol 17 (11) ◽  
pp. 2615 ◽  
Author(s):  
Gaoxuan Wang ◽  
Serge Reboul ◽  
Jean-Bernard Choquel ◽  
Eric Fertein ◽  
Weidong Chen
Keyword(s):  
Coherent Detection ◽  
Dual Phase ◽  
Weak Signal ◽  
Phase Lock ◽  
Circular Regression ◽  
Lock In

The Application of Lock-in Amplifier in Weak Signal Detection

2011 ◽  
Vol 403-408 ◽  
pp. 2650-2653 ◽  
Author(s):  
Jia Tian Zhang ◽  
Gang Liu
Keyword(s):  
Signal Detection ◽  
Input Signal ◽  
Basic Concept ◽  
Electric Signal ◽  
Band Pass Filter ◽  
Weak Signal ◽  
Weak Signal Detection ◽  
Pass Filter ◽  
Band Pass ◽  
Lock In

The paper introduces the lock-in amplifier, the basic concept of weak signal detection, and analyzes its application in weak electric signal detection.The results show that: lock-in amplifier has a very strong resistance to noise. Compared to band-pass filter, the output signal is not amplify input signal, but amplify the AC signal and turn it into DC signal.

Lateral growth of indium(III) selenide nanoribbons and their optoelectronic performance for weak signal detection

2021 ◽  
Vol 546 ◽  
pp. 149166
Author(s):  
Haibo Gan ◽  
Jidong Liu ◽  
Qiaoyan Hao ◽  
Di Wu ◽  
Peng Li ◽  
...  
Keyword(s):  
Signal Detection ◽  
Weak Signal ◽  
Lateral Growth ◽  
Weak Signal Detection
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