CONTACT POTENTIAL DIFFERENCE DETERMINING DEVICE Russian patent published in 2021 - IPC G01R19/00 

FIELD: measurement.

SUBSTANCE: invention relates to measurement equipment, in particular to physical and analytical equipment for investigation and monitoring of surface properties of materials in vacuum, as well as for monitoring characteristics of interphase boundaries, and can be used in production of film systems, in electrochemistry, in material science. Device for measuring contact potential difference comprises an electron gun with an electron beam former and with a cathode assembly consisting of a cathode and a modulator with a diaphragm, inside which there is a cathode, as well as a holder of the measured object, a gun power supply, a voltage source with switched polarity of the output voltage, a voltage meter connected to the holder of the measured object and to the cathode of the electron gun, a current meter between the object holder and the electron gun cathode. To achieve the technical result, the cathode of the electron gun is made of a flat tape with a width greater than the diameter of the opening of the diaphragm of the modulator and located parallel to the plane of the diaphragm of the modulator at a distance less than the diameter of the opening of the diaphragm, and the electron beam former contains not less than four electrodes of the lens systems.

EFFECT: technical result is aimed at improvement of reliability and accuracy of results of contact potential difference determination.

1 cl, 1 dwg