Summary

The YMP-6117 Millikan oil drop experimental device controls the charged oil droplets in a uniform electric field, uses a CCD imaging system, observes and measures the movement of the charged oil droplets in the uniform electric field and gravitational field, and calculates the charge of the entire oil droplet. After repeating the experiment on many oil droplets, Millikan found that the total charge value of all oil droplets was a multiple of the same number, so he determined that this value was the charge of a single electron: e=1.602^-19 coulomb. This experimental device is classified according to the mode of movement, and the oil drop method for measuring electron charge is divided into a balanced measurement method and a dynamic measurement method. The experimental system consists of a host, a CCD imaging system, an oil drop box, a sprayer and other components, among which the host includes controllable high-voltage power supply, a timing device, A/D sampling, data communication and other unit modules.

Experiments

• Learn the principles and methods of measuring electron charge by oil drop experiments.

• Verify the discontinuity of charge and measure the basic charge e.

• Understand the working principle of CCD optical imaging system.

• Cultivate students' rigorous attitude and meticulous scientific experimental methods through the selection, patient tracking and measurement of oil droplets.

  
  

Features

• Adopts color high-definition CCD imaging system;

• The experimental host and oil drop box are separated to ensure the isolation of oil mist from the control circuit;

• The software has the function of real-time display of voltage, timing and image, and automatically processes experimental data;

• Two experimental interfaces for equilibrium method and dynamic method;

  
  

  
  

Software

Typical Data

Table 1 Balance voltage and falling time records

Table 2 Calculation of e