Method for measuring Pohl resonance phase difference by using digital oscilloscope

Abstract

The invention provides a method for measuring a Pohl resonance phase difference by using a digital oscilloscope and relates to the field of physical experiment parameter measurement. The method for replacing a stroboscopic method for measuring the phase difference is proposed. According to the technical scheme, a swing wheel and a rocker are respectively and fixedly provided with a touch jaw which is in a 7 shape; soft conductor wires are suspended above the swing wheel and the rocker respectively; the swing wheel swings to the position where the touch jaw touches the corresponding soft conductor wire, a circuit is made to be connected to a power source, a pulse voltage is output at an open circuit end, and open circuit voltages generated due to connection at the upper end of the swing wheel and the upper end of the rocker are connected to the an X input port and a Y input port of the double-tracking digital oscilloscope respectively; an input signal is obtained through a time measurement tool of the digital oscilloscope, a vibration cycle T is measured on an oscilloscope display screen, the time interval delta T between the high levels of two signals is measured, and when the delta T is smaller than T / 2, the phase difference is 360 degrees*delta T / T. The method for measuring the Pohl resonance phase difference by using the digital oscilloscope has the advantages that the influences on the working state of an electronic circuit of a large current instrument are avoided, and the prior art is expanded.

Description

technical field [0001] The invention relates to the field of physical experiment parameter measurement, in particular to the measurement of the phase difference between an external force and a balance wheel when a Bohr resonance instrument is forced to vibrate. Background technique [0002] In the university physics laboratory, the Bohr resonance instrument generally uses the stroboscopic method to measure the phase difference between the external force and the balance wheel. The experimental device is as follows: figure 1 . [0003] Device structure: the angle disc is fixed on the outside of the motor. The angle disc is not connected with the motor shaft and is in a static state, that is, it does not rotate with the motor shaft. The angle disc and the motor shaft have a common center of circle. The upper semicircle of the angle disc has a scale. The minimum scale is 1 degree; the outside of the angle disc is the angle pointer disc, which is a plastic disc, and the angle po...

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Problems solved by technology

[0007] Due to the high current of the flash lamp, the internal partial voltage of the experimental instrument is insufficient when the flash lamp is used, which may cause abnormal working status of the electronic circuit of the measuring instrument. It has been found in the experiment that the displayed cycle data has abnormal changes, usually when the flash occurs. The significant reduction has caused many students to question: Is the phase difference data accurate?

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