Conductance and differential conductance synchronous measuring device and method

A differential conductance, synchronous measurement technology, applied in measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve the problems of impossible weak signal detection, complex conductance measurement circuit boards, and difficult device fabrication.
CN101666828BInactive Publication Date: 2011-07-20NANCHANG HANGKONG UNIVERSITY
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
NANCHANG HANGKONG UNIVERSITY
Publication Date
2011-07-20
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

A conductance and differential conductance synchronous measuring device comprises a DC signal source, an AC signal source, an operational amplifier, a feedback resistor and a Fourier spectrum analyzer, and is characterized in that the AC signal source is connected with the positive input end of the operational amplifier; the DC signal source is connected with a tested sample and then connected with the negative input end of the operational amplifier, the output end of the operational amplifier is connected with the Fourier spectrum analyzer; and the feedback resistor is connected between the negative input end of the operational amplifier and the Fourier spectrum analyzer. The invention has the following advantages: firstly, the interaction of AC / DC voltage signals can be prevented so as to improve the signal-to-noise ratio; secondly, the accuracy of measurement results is monitored; thirdly, a measuring circuit can synchronously measure conductance and differential conductance to realize ultra-high resolution measurement on sample conductance variation; and fourthly, the measuring circuit is simple and easy in implementation.
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Description

technical field

[0001] The invention relates to a synchronous measuring device and method, in particular to a synchronous measuring device and method for conductance and differential conductance. Background technique

[0002] Conductivity testing technology is widely used in electronics, chemical industry, biology, medicine, environmental protection and other fields, such as measurement of electronic tunneling characteristics, liquid composition analysis, biological tissue detection, etc. The usual method is to measure the current-voltage relationship, and then perform numerical differentiation to obtain the conductance [(Thomas D.E., et al.. Rev Sci Ins, 1963.34 (8): 920), (William R, et al.. Rev Sci Ins, 1964.35( 12): 1704)], but because the accuracy of the voltage source meter is low, and the jump point will occur when the range is changed, which seriously affects the conductance measurement result. There is also the use of lock-in amplification technology [Huang Zhiyao,...

Claims

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