Micro-power measuring device and method based on precise torsion balance cycle method

Abstract

The invention discloses a micro-power measuring device and method based on a precise torsion balance cycle method. The measuring device comprises a precise torsion balance, a laser, a lens, a PSD (phase sensitive detection) optical displacement sensor, a digital storage oscilloscope and a computer; the precise torsion balance comprises two metal balls, a glass rod, a plane reflective mirror and two parallel metal plates which face to each other; the digital storage oscilloscope is connected with the output end of the PSD optical displacement sensor; the computer is connected with the digital storage oscilloscope; the measuring method comprises the following steps that the glass rod with micro-power balls performs cyclic swinging under the coaction of static field moment and tungsten wire restoring moment, the plane reflective mirror reflects the light beam of the laser to a photosensitive surface of the PSD optical displacement sensor, so that the swing of the precise torsion balance is converted into cyclic movement of spot displacement. The device provided by the invention adopts a measuring technology based on a dynamic cycle method, and small ball micro-power can be obtained through measuring the swing cycle.

Description

technical field [0001] The invention relates to a micro-electricity measurement device and method, in particular to a micro-electricity measurement device and method based on a precision torsion balance periodic method, belonging to the technical field of micro-electricity measurement. Background technique [0002] The measurement of micro-electricity makes physical analysis leap from qualitative to quantitative calculation and precise measurement. At present, the measurement of micro-electricity, especially the detection of elementary charge e, has been a difficult problem for experimental physicists until 1907-1913. The experiment of determining the charge of electrons done by Jia Millikan solved this problem. However, there are not many solutions to realize micro-electricity measurement, and the electronic holography method realizes about 10 -16 Coulomb's micro-electricity measurement, but requires a special test sample; the electrolytic water method can measure the elec...

AI Technical Summary

Problems solved by technology

However, the torsion angle is extremely small when measuring micro-electricity. Due to the influence of air disturbance and various environmental factors, the balance position of the torsion balance drifts uncertainly, resulting in low accuracy of torsion angle or swing amplitude measurement.

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