Aeroines concentration detector

FIELD: measurement technology.

SUBSTANCE: detector can be used in concentration meters as positive and negative aeroiones. Aeroion concentration detector has bias voltage source and receiving probe. Detector additionally has two resistors connected in series, auxiliary electrode and electrometer for measuring output voltage that is proportional to measured concentration of aeroiones. Receiving probe has to be volumetric electrode made of metal grid inside which the auxiliary electrode is located. The latter is isolated from volumetric electrode.

EFFECT: improved functional abilities.

1 dwg

 

The invention relates to measuring devices and can be used in measuring the concentration of both negative and positive ions, as well as in systems automatically maintain the intensity of artificial ionization of the air.

The opportunity to use the device in vivo can be used for the purposes of geophysical exploration and engineering Geology.

Currently known for a qualitative measure of the concentration of ions [1]. It includes a fan for blowing air through the suction chamber. The contacting of small elements with a relatively large amount of the blown air leads to rapid contamination, especially in conditions of high humidity. Therefore, to conserve and maintain the measurement accuracy at an acceptable level requires systematic cleaning and drying apparatus. Working with outdoors almost bezrezultatno. The latter may fail at the first measurement.

More reliable in this regard are the measures with the receiving probe [2]. At the same time, this device is taken as a prototype, is also not designed to work outdoors. The main reason for this is the presence of conduction between the probe and the earth by air humidity. The resulting leakage current may be much greater than the measured ion current, making the measurements unreliable.

The main technical problem on which the invention is directed, is the creation of a probe concentration of ions with compensation error due to the humidity.

This technical result is achieved in that the sensor concentration of ions containing the source bias voltage and the receiving probe, additionally introduced two series-connected resistors, the auxiliary electrode, the electrometer to measure the output voltage, proportional to the measured concentration of the ions, and the receiving probe consists of a solid electrode made of metal mesh, inside of which is insulated from the support electrode connected with the first of two series-connected resistors, the second of which is grounded, and the source bias voltage has one pole connected to the receiving probe, and the second to the middle connection point of the resistors.

Sensor schematic concentration of ions is shown in the drawing, where indicated:

1 - receiving probe;

2 - auxiliary electrode;

3 - source bias voltage;

4; 5 - resistors;

6 - electrometer;

Rutut2 - equivalent resistance of the leakage caused by the humidity of the air between the receiving probe and the auxiliary electrode and between the receiving probe and the earth.

The principle of the device is as follows: when applying a bias voltage to the receiving probe oppositely charged air ions from the surrounding space closer to him and, in contact with its surface, giving the charge. The latter is compensated by the electric current passing from the source of bias voltage 3 chain: a receiving probe 1, the air, the earth, the resistor 5. Component of the voltage across the resistor 5, the resulting current is a useful signal proportional to the specific concentration of ions. For this circuit the current flows due to the presence of a leak resistance Rut2. The leakage current between the receiving probe 1 and the auxiliary electrode 2 passes through the Rut1 and the resistor R4. It is easy to see that the currents passing through the resistors R4 and R5, are directed towards each other, therefore, the voltage drops at the resistors caused by leakage currents, can be mutually compensated, if the input voltage of the electrometer 6 is the total voltage across the resistors R4 and R5. Full compensation is achieved by adjusting, which is cheese in a closed room with the absolute absence of ions. is this the case, by varying the value of resistor R4, to achieve a zero reading of the electrometer. The effect of the adjustment will be more sustainable if the equality leakage currents, i.e. when Rut1=Rut2. The approximate equality of these values achieve the selection arrangement and geometrical dimensions of the receiving probe 1 and the auxiliary electrode 2.

Changing the polarity of the power source, it is possible to measure the specific concentration of both negative and positive ions. The magnitude of the voltage bias source is in the order of 1.5 kV.

The proposed device is tested experimentally. Experimental layout the receiving probe was performed in the form of triangular prisms, mounted on three legs of insulating material. The side faces are aluminum frame and strained wire mesh and have dimensions of 50×50 see Auxiliary electrode has the shape of a triangular prism with a solid metal sides with dimensions 35×35 see the Resistance of the resistors was 22 Megohms. As an electrometer was used electrometer model 614 company CARD with the value of the input resistance 5×1013Om. Instrument setup was carried out in dense fog conditions by changing the working area of the auxiliary electrode. In a result to regulate the and the value of the output voltage, due to the leakage current decreased from 14 to 0.06 Century Then adjusted the device was tested in a dry place under conditions of artificial ionization of the air. As a control for measuring concentration of ions were used device MAC-01 and as a source of ions - ionizer “Alit-01”. Experimental testing has shown that the error due to humidity in the proposed sensor weakened many times while maintaining the sensitivity on the useful signal at an acceptable level. It is established that for this version of the sensor, the concentration of the ions is determined by the expression:

N≈17 A,

where,

N is the number of thousands of ions in 1 cm3the investigated volume of air;

And the electrometer readings in volts.

Literature:

1. The counter ions MAC-01. Manual.

2. Measuring the concentration of negative ions. Patent RU 2077713. (Prototype)

The sensor concentration of ions containing the source bias voltage and the receiving probe, characterized in that the sensor further comprises two series-connected resistors, the auxiliary electrode, the electrometer to measure the output voltage, proportional to the measured concentration of the ions, and the receiving probe consists of a solid is electrod, made of metal mesh, inside of which is insulated from the support electrode connected with the first of two series-connected resistors, the second of which is grounded, and the source bias voltage has one pole connected to the receiving probe, and the second to the middle connection point of the resistors.



 

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