The Detection System of Adaptive Electrochemical Micro Electric Current

2013 ◽  
Vol 313-314 ◽  
pp. 304-307
Author(s):  
Sheng Qian Ma ◽  
Man Hong Fan
Keyword(s):  
Signal Detection ◽  
Detection System ◽  
Current Signal ◽  
Weak Current ◽  
Large Size ◽  
Detection Circuit ◽  
Circuit Structure ◽  
Electrochemical Current ◽  
High Degree ◽  
Current Detection

The existing micro current detecting apparatus is of large size and is manual controlled. When the detected currents sensitivity is higher, however, stability will be worse. In order to solve this problem, an adaptive detection system is proposed in this paper. The system designed a micro current signal detection circuit based on OK6410 embedded with development board. The Weak current signal is collected with the high precision ADC. Automatic adjustment circuit gain is from 1 to 10000. Spectrometer wavelength size is changed in real-time. Current resolution can reach nA. The experimental results show that this system can collect the micro current effectively. The main characteristics of the system are simple circuit structure, small volume, high degree of automation, and strong reliability, and it greatly improves the anti-interference performance of the circuit. The system can not only be applied in electrochemical current detection, but also be widely used in weak signal detection.

scholarly journals A highly sensitive wide-range weak current detection circuit for implantable glucose monitoring

2016 ◽  
Vol 13 (8) ◽  
pp. 20150616-20150616 ◽  
Author(s):  
Xi Tan ◽  
Sizheng Chen ◽  
Xiao Yan ◽  
Yibo Fan ◽  
Hao Min ◽  
...  
Keyword(s):  
Glucose Monitoring ◽  
Weak Current ◽  
Highly Sensitive ◽  
Wide Range ◽  
Detection Circuit ◽  
Current Detection

Simulation Study on Multi-Frequency Signal Detection in Perimeter Intrusion Detection System by Matlab

2014 ◽  
Vol 530-531 ◽  
pp. 293-296
Author(s):  
Zhi Gang Li ◽  
Ling Yun Chen ◽  
Ming Ji Wang ◽  
Yu Shuang Li
Keyword(s):  
Intrusion Detection ◽  
Signal Detection ◽  
Simulation Study ◽  
Intrusion Detection System ◽  
Detection System ◽  
Electromagnetic Disturbance ◽  
Frequency Signal ◽  
Detection Circuit ◽  
One Machine ◽  
Processing Circuit

Multi-domain perimeter intrusion detection system by one machine is based on leaky cable. To solving the problem that the multi-frequency electromagnetic disturbance signal detection circuit is complex and repeated, a method is raised, which is without processing by different frequency, sending the intrusion disturbance signal from multisport to processing circuit to perform FFT, contrasting it with signal spectra without disturbance by frequency analysis, and determining if intrusion happened, the number of intrusion case, detailed place and domain. Simulation study is performing by Matlab, which demonstrated the feasibility and advantage in the project.

A Weak Current Detection Circuit Design of Organophosphorous Pesticides Rapid Detection Portable Instrument

2011 ◽  
Vol 403-408 ◽  
pp. 2569-2572
Author(s):  
Xia Sun ◽  
Xiang You Wang ◽  
Shu Yuan Du ◽  
Ying Zhu
Keyword(s):  
Rapid Detection ◽  
Electrochemical Analysis ◽  
Cyclic Voltammograms ◽  
Portable Instrument ◽  
Organophosphorous Pesticides ◽  
Weak Current ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Detection Circuit ◽  
Current Detection

In this paper, a weak current detection circuit is designed for developing organophosphorous pesticides rapid detection portable instrument. The detection principle is based on the electrochemical characteristic of enzyme catalyzing substrate of acetylcholinesterase biosensor for detecting pesticide residues. Based on the behavior of cyclic voltammograms (CV) of the acetylcholinesterase biosensor, the data acquisition and processing circuit of the weak current signals generated by the biosensor is designed, which including the I/V conversion, differential amplification , low-pass filter, A/D conversion etc. Eventually, the 0~5V voltage signal are obtained and they are proportional to the weak current from the enzyme biosensor. The designed detection circuit has a good consistence compared with electrochemical analysis instrument, which can establish a good base for developing organophosphorous pesticides rapid detection portable instrument.

Ion Current Detection During Cold Starting and Idling in Diesel Engines

2012 ◽  
Author(s):  
Sanket Gujarathi ◽  
Tamer Badawy ◽  
Naeim Henein
Keyword(s):  
Feedback Control ◽  
Signal Detection ◽  
Fuel Consumption ◽  
Diesel Engines ◽  
Ion Current ◽  
Current Signal ◽  
Gasoline Engines ◽  
Cold Starting ◽  
High Concentrations ◽  
Current Detection

Cold starting of diesel engines is characterized by inherent problems such as long cranking periods and combustion instability leading to an increase in fuel consumption and the emission of high concentrations of hydrocarbons which appear as white smoke. The ion current signal has been considered for the feedback control of both gasoline and diesel engines. However, the ion current signal produced from the combustion of the heterogeneous charge in diesel engines is weaker compared to that produced from the combustion of the homogeneous charge in gasoline engines. This presents a problem in the detection of the ion current signal in diesel engines, particularly during starting and idling operations. This paper investigates and addresses the ion current detection problems pertaining to cold starting and various idling speeds. Also, different approaches have been investigated to improve the signal detection under these conditions.

Design of micro current detection circuit for FAIMS

2011 ◽  
Vol 25 (8) ◽  
pp. 711-715 ◽  
Author(s):  
Shujiang Yan ◽  
Fei Tang ◽  
Xiaohao Wang ◽  
Fan Wang ◽  
Tao Yang
Keyword(s):  
Detection Circuit ◽  
Current Detection

scholarly journals Vocal plasticity in a reptile

2017 ◽  
Vol 284 (1855) ◽  
pp. 20170451 ◽  
Author(s):  
Henrik Brumm ◽  
Sue Anne Zollinger
Keyword(s):  
Signal Detection ◽  
Communication Systems ◽  
Vocal Communication ◽  
Animal Communication ◽  
High Amplitude ◽  
Vocal Plasticity ◽  
Lombard Effect ◽  
Gekko Gecko ◽  
High Degree ◽  
Signalling Systems

Sophisticated vocal communication systems of birds and mammals, including human speech, are characterized by a high degree of plasticity in which signals are individually adjusted in response to changes in the environment. Here, we present, to our knowledge, the first evidence for vocal plasticity in a reptile. Like birds and mammals, tokay geckos ( Gekko gecko ) increased the duration of brief call notes in the presence of broadcast noise compared to quiet conditions, a behaviour that facilitates signal detection by receivers. By contrast, they did not adjust the amplitudes of their call syllables in noise (the Lombard effect), which is in line with the hypothesis that the Lombard effect has evolved independently in birds and mammals. However, the geckos used a different strategy to increase signal-to-noise ratios: instead of increasing the amplitude of a given call type when exposed to noise, the subjects produced more high-amplitude syllable types from their repertoire. Our findings demonstrate that reptile vocalizations are much more flexible than previously thought, including elaborate vocal plasticity that is also important for the complex signalling systems of birds and mammals. We suggest that signal detection constraints are one of the major forces driving the evolution of animal communication systems across different taxa.

Acousto‐optic signal detection system

1986 ◽  
Vol 79 (2) ◽  
pp. 586-586
Author(s):  
Otis G. Zehl ◽  
Michael G. Price ◽  
Edward H. David ◽  
Jerome C. Kremen
Keyword(s):  
Signal Detection ◽  
Detection System
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