Electroelastic tolevamer

 

(57) Abstract:

Usage: in the measuring technique can be used to measure the mass of dielectric liquids. The inventive tolevamer contains a level sensor 1, the reference capacitor 2, the voltage generator 4, amps DC 5, an adjustable amplifier 6. The sensor and reference capacitor included in the diagonal of the diode circulator, to another diagonal which is connected a DC amplifier, and the oscillator through an adjustable divider is connected to the connection point between the sensor and the reference capacitor. 1 Il.

The invention relates to measuring technique and can be used to measure the mass of dielectric liquids, such as aviation fuels.

Closest to the present invention is tolevamer that contains a level sensor with a pair of diodes, a current amplifier channel level sensor connected to its output indicator, generator periodic signal with a constant product of the voltage amplitude on the frequency, the sensor hub with a pair of diodes, a reference (constant) capacitor with its pair of diodes and a current amplifier of the reference channel. All diodes are placed in the liquid, i.e., have him pace the current is directly proportional to the current through the corresponding capacitor, define the capacitive resistance of the capacitor and the voltage drop at a particular diode in a particular half-cycle of the voltage generator. The summation of the constant current circuits of the compensator and the reference capacitor allows you to choose the gear ratio of the total chain depending on the ratio of the capacitances of these capacitors in accordance with the fuel index, and using a voltage amplifier channel compensation by converting this voltage into a current, offset current at the input of the amplifier channel level sensor, i.e., to compensate for the initial capacity level sensor.

The prototype disadvantages are the complexity of the technical solution, due to the presence of the sensor compensator dielectric constant and the gain channel his power and presence of the truncation error caused by the existence of immeasurable amounts of fluid in the sensor zone compensation in the tank with the liquid.

The aim of the invention is to improve the accuracy of measurement of the mass of fuel by eliminating immeasurable volume of the tank and simplification of the device.

This is achieved by the fact that in electroelastic tolevamer containing the sensor and the reference capacitor, included the prison to the other diagonal of the diode circulator, adjustable amplifier connected between the generator voltage and the connection point of the sensor with the reference capacitor. Thus, there are no additional communication line and an additional measurement channel on the fuel temperature. Function armament perform diodes, rectifying currents of the level sensor and the reference capacitor. And to the capacitance sensor and temperature were multiplicative used the reference capacitor with a pair of diodes, the output current which is opposite in direction to an output current of the diodes of the level sensor. Adjustable air amplifier is a simple amplifier with the possibility of setting its gain voltage.

The drawing shows a diagram of the proposed tolevamer.

Electroelastic tolevamer contains a level sensor 1, the reference capacitor 2, four diode 3, the generator voltage AC 4, a DC amplifier sensor 5 and an adjustable amplifier 6.

The output of the generator 4 is connected through an adjustable amplifier 6 to the connection point of the first plates of the sensor 1 with the reference capacitor 2, the DC amplifier 5 is connected to the cathode of the first and the anode of the fourth diode, the second of obedinena with the anode of the third and the cathode of the fourth diode.

Tolevamer works as follows.

In the connection point of the sensor 1 with the reference capacitor 2 is fed through an adjustable amplifier 6 voltage Uggenerator 4. Output current sensor 1 according to the scheme has a negative polarity, and the output current of the reference capacitor 2 positive polarity. If the capacitance of the reference capacitor 2 is equal to the capacity of "dry", i.e., not immersed in fuel sensor 1, it is equal and the currents on the module, and therefore, the total current on the line is equal to zero. This compensated for the initial capacity of the sensor 1. Since the parameters of the diodes 3 are close to each other, with equal currents voltage drops on them differ very little due to the smallness of the differential resistance of the diode. This ensures high stability of the zero tolevamer. Also due to the coincidence or proximity parameters of their temperature diodes care almost the same, i.e., the temperature stability of the zero tolevamer also high.

When filling sensor 1 fuel increases the capacity by increasing the liquid column level. This leads to an increase in the current and, consequently, to increase the output voltage of tolevamer Uoat the output of the DC amplifier e and density p. This leads to the change of the indication level. To compensate for these changes in the measurement of the mass of fuel should be adjusted according to the temperature so as to compensate for temperature changes of level. As the temperature is increased the values of e, p (and the fuel index 1) decrease, the decrease in the current through the capacitance of the sensor due to 1 should be offset by the corresponding increase of the current by reducing the voltage drop Udin particular diode in a particular half-cycle voltage of the alternator. A corresponding increase in current is achieved by selecting the value of the voltage Uggenerator 4 by an adjustable amplifier 6.

ELECTROELASTIC TOLEVAMER containing the generator AC voltage, a DC amplifier, chetyre diode sensor and the reference capacitor, the first plates of which are connected, characterized in that it introduced an adjustable amplifier connected between the generator voltage and the connection point between the plates of the sensor and the reference capacitor, and the anode and first cathode of the second diode is connected to the second plate of the sensor, the anode of the third and the cathode of the fourth diode with and grounded, and the fourth anode and the cathode of the first diode is connected to the input of the DC amplifier.

 

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