SU518663A1 - Method for measuring pressure in a two-electrode electrovacuum device - Google Patents

Description

On the KKfOR diode, a constant potential potential UQ / {isiuppa is applied. H) A potentiator variable of the 1 / -harmonic form, varying with the backwater.

lU Ul "-GCStotV, ®

the amplitude of the variable harmonic potential U, W - is the circular frequency of the variable harmonic

potential. Uo5Ш

% - current time (plot v},

When the condition UQ is fulfilled, the resulting potential U of the cathode is made up of the constant populite potential of UQ and the variable harmonic potential of Sapur's monic potential (§), the anode of the diode has a constant potential Ug. |

Accelerated motion of thermoelectrons Cagoda to the anode of the diode 1 is overpowered

phase interval. variable potential C (see figo 1, ...), when the potential U i of the cathode becomes lower than the potential U of the anode (see Fig. 1, C and c) In phases - alternating

U / ci -, O -, 1 h-, S & -.-. / - (see fig 1 d) selection

electrons from the cathode of the diode is terminated, since the potential of the UK cathode becomes higher than the potential U, JQ of the anode: (eshores.), and the electrons emitted from

the cathode in the phase range f - f (the plot of j. continues, by inertia, the motion to the anode in the decelerating electric field, the movement of electrons in the direction from the cathode to the anode stops completely until the phase fg "

and before the phase, all the electrons return to the cathode, the potential of which is Uj in the phase 1 interval. - f above the potential of the U anode (plot & u). The phase interval ' - f l during which the processes described above occur less than 2, k (plot i5), thereby eliminating the possibility of a thermoelectric falling. cathodes on the anode for a period of variable harmonic potential U. In the following periods, the cycles are repeated. In their movement from the cathode to the anode and the reverse of the 1O, the cathode's thermionic electrons, when colliding with gas molecules, produce ionization. Positive ions are trapped by the diode anode having a negative potential C compared with the potential of the cathode.

During the greater part of the perturbed harmonic potential period C (Eschores T, and and J), the constant component of the ion current is a measure of pressure.

This electrical mode is implemented in the circuit diagram shown in FIG. 2. The cathode of diode 1 is under a constant positive potential Uo of the bias voltage source 2 and a variable harmonic potential U. of the high frequency generator 3 Separating the bias voltage source 2 and the high frequency generator 3 by alternating current is realized, for example, throttle 4., in a constant manner - using a capacitor 5. To power the channel of diode 1, a voltage source of voltage 6 is used. And, the node of diode 1 has zero potential, since it is. the alternating current is connected to the housing with the aid of a capacitor 7, in a constant manner through a measuring device 8.

Ф орм ул а and 3 о брэ ё н and

The method of measuring pressure in a two-electrode electro-vacuum device by supplying a voltage to it electrically and recording the rate of formation of ions

When electrons interact with gas molecules, it is due to the fact that, in order to increase the measurement accuracy, a constant voltage is applied between the cathode and the anode

. positive polarity at the cathode and harmonic, the voltage of such a frequency that provides oscillation during the movement of the electron without falling on the anode, and then measuring the value of constant mean

setting ion current proportional to the pressure measured.

Sources of information taken into account in the expert:

1. Groshkovsky I ,. Technologists of high vacuum, IL, M., 1957, p. 308 (SV proto....

:TYPE OF). ::

2. Korotchenko V. A, Solomennikova V. S Solomennikov G, V, Method of recording pressure measurement in an open diode, Sat,

g Electronics, Proceedings of the Radio Institute, vol. 35, P; 1973.