Electromagnetic induction timing gate
A technology of electromagnetic induction and inductance coil, which is applied in the field of teaching and scientific research, can solve problems such as narrow induction range, difficult control, and low success rate of operation, and achieve the effects of improving success rate, reducing precision requirements, and simplifying test operations
Active Publication Date: 2018-12-18
NORTHEASTERN UNIV
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Problems solved by technology
[0003] The falling ball method experiment requires the ball to fall along the central axis of the container, and the time for the ball to pass through a certain distance at a uniform speed is measured through the photogate, so as to reflect the viscosity coefficient of the liquid. Narrow, requires the metal balls to be placed along the axis of the oil barrel (that is, aligned with the photoelectric gate), which is difficult to control and the success rate of operation is not high
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Embodiment Construction
[0014] In order to solve the problems existing in the existing technology, such as Figure 1 to Figure 2 As shown, the present invention provides an electromagnetic induction timing gate, including a container, a timer, a first circuit and a second circuit, the first circuit and the second circuit have the same structure, and both include an oscillator, an amplifying circuit and a NE555 chip, and the first circuit The inductance coil of the oscillator of the first circuit is wound on the upper part of the container, and the inductance coil of the oscillator of the second circuit is wound on the lower part of the container;
[0015] When the metal ball passes through the inductance coil of the first circuit, the oscillation amplitude of the oscillator of the first circuit becomes smaller or stops, and the oscillation current is amplified by the amplifier circuit and then transmitted to the NE555 chip of the first circuit, and the NE555 chip of the first circuit The processing i...
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The invention relates to an electromagnetic induction timing gate which comprises a container, a timer, a first circuit and a second circuit. The first circuit and the second circuit are the same in structure and both comprise oscillators, amplification circuits and NE555 chips; an inductance coil of the oscillator of the first circuit is wound at the upper part of the container; and an inductancecoil of the oscillator of the second circuit is wound at the lower part of the container. According to the invention, an oscillation circuit is utilized; inductance is formed by winding the coils onthe container; component parameters are regulated to enable the oscillators to normally work; when a metal ball passes through the inductance coils, the inductance of the inductance coils is changed so as to damage the oscillation condition and reduce an amplitude of oscillation or stop oscillation; and according to such amplitude change, by amplification and shaping, a suitable level is output and transmitted to the timer so as to fulfill the timing aim. The accuracy requirement required by ball putting is reduced, the test operation is simplified, and the success rate of the test is improved.
Description
technical field [0001] The invention belongs to the technical field of teaching and scientific research, and relates to the measurement of liquid viscosity coefficient, in particular to an electromagnetic induction timing gate. Background technique [0002] Liquid viscosity coefficient is an important parameter to characterize the ability of liquid to resist deformation, and has important applications in production, life, engineering technology and medicine. There are many methods for measuring the viscosity coefficient, such as falling ball method, capillary method, rotating drum method, etc. Among them, the falling ball method is the most basic method, and the method of measuring the viscosity coefficient of a liquid by the falling ball method is only suitable for measuring the viscosity coefficient. Transparent or translucent liquids, such as castor oil, glycerin, etc., but because of the obvious physical phenomena, intuitive principles, and more experimental operations a...
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IPC IPC(8): G01N11/12
CPCG01N11/12
Inventor 王旗朱盼盼朱雨莲胡广兴
Owner NORTHEASTERN UNIV