Micro-power measuring device and method based on precise torsion balance cycle method
A measuring device and micro-electricity technology, which is applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve problems such as small torsion angle, low accuracy of torsion angle or swing measurement, and unstable balance position drift of torsion balance, etc., to achieve high precision Improve and reduce external interference and reduce the effect of manpower and material resources
Inactive Publication Date: 2013-05-01
SOUTH CHINA AGRI UNIV
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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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Embodiment 1
[0037] like figure 1 As shown, the micro electricity measuring device in this embodiment includes a precision torsion balance 1, a laser 2, a lens 3, a PSD optical displacement sensor 4, a digital storage oscilloscope 5 and a computer 6; the precision torsion balance 1 includes two metal balls 1 -1. Quartz glass rod 1-2, flat mirror 1-3 and two iron plates 1-4 parallel to each other and facing each other; the length l of the glass rod 1-2 is 6cm, the diameter φ is 50μm, and the The metal balls 1-1 are respectively pasted on both ends of the glass rod 1-2; the reflection surface of the plane mirror 1-3 is on the same plane as the two metal balls 1-1; the two iron plates 1- The length of 4 is 30cm, the width is 20cm, and the distance between the two iron plates 1-4 is 10cm, which is perpendicular to the glass rod 1-2 and the flat mirror 1-3, and is relative to the metal ball 1-1. It is large enough to generate a uniform electric field in the facing area when the high voltage el...
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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 measuring device and method, in particular to a micro-electricity measuring device and method based on a precision torsion balance periodic method, and belongs 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 electric charge e, has always been a difficult problem for experimental physicists, until 1907-1913 American Physics This problem was solved by experiments conducted by Millikan to determine the charge of electrons. However, there are not many solutions to achieve micro-electricity measurement, and the electron holography method achieves about 10 -16 Coulomb's micro-electricity measurement, but requires a special test sample; electrolyzed water...
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IPC IPC(8): G01R29/24
Inventor 谭穗妍李海黎永耀陈东辉骆注明陈旻
Owner SOUTH CHINA AGRI UNIV