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Estimation of the influence of the parameters of electrical signals when measuring the contact potential difference

Keywords:

V.V. Kalmykov – Senior Lecturer, Kaluga branch of the Bauman MSTU
E-mail: kalmykovvv@bmstu.ru
M.V. Mousokhranov – Ph.D.(Eng.), Associate Professor, Kaluga branch of the Bauman MSTU
E-mail: marls77@ya.ru
O.O. Smirnov – Undergraduate, Kaluga branch of the Bauman MSTU
E-mail: olegsmirnov2010@yandex.ru


The most important requirement for choosing a method for determining surface energy for practical applications is the simplicity of its implementation and the achievable accuracy of measurements.
The most convenient from the point of view of the continuous non-destructive control of the energy state of the surfaces of machine parts are the methods for determining the work function of an electron over a contact potential difference. The electronic solid state theory, which connects surface energy with the magnitude of the work function of an electron, most accurately describes the energy state of the surface layer.
The measurement of the contact potential difference is realized by a rather simple method, called the method of a non-vibrating ca-pacitor.
One of the main elements of the device for measuring the contact potential difference is the pulse generator.
The results of measurements of the contact difference of the potentials of signals of different shapes and frequencies are investigated. The most stable results and results with the smallest variance of values were determined.
As a result of the experiments, it was found that the shape of the pulse signal and its frequency affect the accuracy and robustness of the results of measurements of the contact potential difference.

References:
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