SU786529A1 - Gas discharge sensor - Google Patents

Description

(54) DISCHARGE SENSOR

Isobregevism refers to taz-discharge jQbiM (instruments and can be used to measure constant and variable magnetic fields.

The following devices are known from Europe: 1, which, however, have significant drawbacks: sensitivity is low, the equipment is cumbersome, and it is impossible to measure constant and variable magnetic fields with the same device.

Closest to this device is a gas discharge sensor 2 with a narrow tube effect, containing a gas-enclosed flask with an anode, cathode and two recording electrodes placed in it, all four electrodes are made in the form of metal rods parallel to the longitudinal axis of the flask and at the same distance from it, with the anode and cathode spaced opposite ours each other, datacha can differ by the fact that the ends of all four electrodes lie iB in the same plane, the perpendicular axis of the axis K | alba, the sensor m / can differ so that the ends of the anode and cathode are separated by a height relative to a plane extending through the ends of recording electron genera pe1rpendikul 1rio iroschyulnoy dat1chika axis.

The electrode system of the device allows realizing the potential distribution of the plasma with characteristic potential. in the primeval region due to the so-called narrow-effect effect.

Such devices include: an intense spreading of the cathode material and, associated with it, gas absorption (rigidity) of a metal film sprayed onto the walls (getter film action), the reliability of the device is essential; large variation in ignition voltage; low mechanical strength; impossibility of operation at high temperatures of the environment (which is caused by the softening of the glass of the flask).

The purpose of the invention is to increase the reliability and stability of the sensor ignition potential due to the stiffness of the gas and the inertia of the instrument.

The goal is achieved by the fact that in the device the anode and cathode are placed opposite each other, and an additional anode is inserted between them, made in the form of a metal washer with a central hole, the diameter of the hole corresponds to the diameter of the cathode, and the anode and the measuring electrodes are coplanar by

one side. relative an additional aioda.

An additional difference is that the gas cylinder of the three-dimensional sensor is made in the form of a metal-ceramic "obstruction containing a ceramic stan with an anode and an electrode, an additional ring anode, a ceramic washer and a metal electrode fixed in the bottom. ooHiOBiaHMe, connected to Melchda by saboi, through soldering, the cathode is made in the form of a metal cylinder, a ceramic washer inserted into the hole and connected to the metal: a keystone.

An additional anode with a central hole, -injected into the sensor design, as indicated above, reduces the area of the internal surface of the flask, which is subject to dusting by the cathode substance as a result of cathode sputtering, and thereby suppresses the effect of gas stiffening. In addition, an additional anode allows for the implementation of the sensor / preparatory discharge, which 3 | Significantly reduces the static lag time of the ignition of the discharge, therefore, reduces also: power | sensor:. All this contributes to the reliability and stability of the ignition potential of the sensor.

Such an implementation of structural elements also makes it possible to realize the advantages of the metal-ceramic structure, to increase the mechanical and thermal resistance.

FIG. 1 shows schematically the structure of the device; FIG. 2 - electric An automatic device switching circuit.

The sensor bulb is a ceramic cup 1, a ceramic washer 2, an additional anode 3 made in the form of a ring. Metal base 4 and metal, rod 5, connected to each other By soldering. The sensor is pumped out and filled with gas, for example, neonOM, to a pressure of: 5-ilO T. Anode 6 (center) and Я3me are in the bottom of the ceramic cup 1 and the 3mme: p1 electrodes 7 and 8. Cathode 9 n in a metal base and placed in the hole of a ceramic washer, which serves. For fixing the position of the cathode. In the metal base, which serves as the electrical output of the cathode, the armature is siphoned off by the vortex, in the form of a metal tube, which, after pumping and filling the sensor with gas, is sealed off with a cold onocoi6oM. For pumping out and filling with gas, the holes 10 and 11 serve. The additional anode serves to create a batch discharge.

The electrical circuit for switching on the device (Fig. 2) contains optics 12 and 13 connected to the plus of source 14.

electric energy and, respectively, with the anode —and an additional anode, resistances 15–17, connected to the measuring electrodes and cathodes of the bridge circuit, measuring device 18, connected to the measuring electrodes.

An example of a specific implementation of the design can serve as a device having the following parameters: internal diameter

flasks (1) 4 mm, distance between anode

6 and a cathode of 9–3 mm, the distance between

measuring electrodes 7 and 8 - 3 mm.

The anode and measuring electrodes are made of molybdenum wire - 0.4 mm, the material of the cathode 9 is molybdenum, diameter 1.5 mm, the material of the additional anode 3 is molybdenum, the hole diameter is 1.5 MM.

The flask is supplemented with gas, such as neoi or argon, to a pressure of 5-10 torr. The limit sensor works as follows.

When applying a constant voltage

additional anode 3 in the gap cathode 9 — an additional anode 3 ignites a preparatory discharge. When a constant voltage is applied to the anode 6, the main discharge is ignited. On electrodes 7

And 8, the potentials of the insulated electrode are automatically set in the plasma: me, corresponding to the points where the electrodes are located. These potentials can reach several tens of volts relative to the potential of the cathode, etc. They are equal, since the electrodes are located symmetrically with respect to the discharge axis.

When the sensor is switched on to the circuit, the currents flowing through the resistances 15 and 16, equal to 1 MΩ, and the shoulders of the variable resistance 17 can be compensated so that the arrow and the measuring device 18 will point to zero. When a sensor is placed in a magnetic field, an imbalance of the shoulders will occur and the measuring device will show the potential difference across the measuring electrodes.

The described gas-discharge sensor can be universally used to measure large and 1-small, constant and variable magnetic fields under conditions of increased mechanical and thermal effects, since the use of a cermet balloon increases the thermal resistance of shanstruktsni to 500 ° C (the glass smears three 300 ° C).

The impact strength of devices with a metal-ceramic enclosure reaches 1500 m / s 10 kHz with a shortening effect (for glass it is 4 kHz).

Vibration resistance at (accelerating effect of 1500 kHz (in arsenic-2 kHz).

The presence of a preparatory discharge stabilizes the ignition potential of the gas discharge sensor.

The design of the zhatod eliminates the intensive evaporation of the material of the cathode, on the walls of the volume, where the main discharge is burning.

Claims (2)

1. A gas discharge sensor with a narrow tube suction tube for measuring taostoyannyh and 1p. Of variable, small-sized loli containing a filling flask with an anode, a cathode and two recording electrodes, each of which is filled in (View metal rods, parallel to the longitudinal axis of the flask, and the ends of the recording electrodes are placed in one plane, the perpendicular to the longitudinal flask, characterized in that, in order to increase the reliability of the ignition potential of the la-rca for icn & f reduced e and zhestcheni gas and inertia of the device, in iem anode and the cathode are arranged coaxially opposite one another and between them introduced dopol1nitelny anode 1vypol1nenny a metal washer with a central hole, and the diameter of the hole corresponds to the diameter of the cathode, and the anode and the measuring electrodes are located on the same side relative to the additional anode. 2. The sensor according to claim 1, characterized in that, in order to increase the mechanical and thermal strength, the cylinder of the gas discharge sensor is made in the form of a metal-ceramic structure containing a ceramic cup with core electrode and measuring electrodes fixed in the bottom, an additional annular anode, ceramic plate and a metal base interconnected by means of an aiki, the cathode is made in the form of a metal cylinder placed in a hole of a ceramic plate and connected to a metal base. Sources of information taken into account in the examination: 1.Afanasyev, Yu.V., et al., Mapnitometric transducers, instruments, equipment, L., Energie, 1972, p. 78 2. Authors certificate of the USSR but for application number 2381964/25, .kl. G 01 R 19/00, 1976 (prototype).