SU1420397A1 - Aneroid altimeter - Google Patents

Abstract

This invention relates to aeronautical engineering. The purpose of the invention is to improve the accuracy of measurement of barometric altitude. The device contains aneroid box 1, sensor 2 with a core 3, amplifier-converter 4, generator 5 pulses, register 8, motor 12 and bimetallic compensator 13. Introduction of a reversible counter 6, converter 7 code - voltage, adder 9, decoder 10 The recorder 11 and the formation of new connections between the elements of the device make it possible to obtain a sum signal arriving at the input of the decoder 10, which is a binary-decoding code encoder to a seven-segment with a digital recorder 11 and which displays a signal proportional to the measured height. 1 il.

Description

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This invention relates to aeronautical engineering, in particular to barometric altimeters.

The purpose of the invention is to improve the accuracy of measurement of barometric altitude.

The drawing shows a diagram of the barometric altimeter.

The altimeter contains a neroid box 1, an inductive sensor 2 with a king 3, an amplifier converter 4, a generator 5 pulses, a reversible counter 6, a converter 7 code - voltage, register 8, adder 9, a decoder 10, a recorder 11, a torque motor 12 and a bimetallic compensator 13.

Amplifier converter 4 is an analog device, the output of which takes the value of +1 and - 1 depending on the deviation of the core 3 of the inductive sensor from the average (zero position).

The pulse generator 5 is used as a source of reference pulses.

Register 8 serves as an input device to the altimeter for corrections to measure static pressure P.

Blocks 1,2,3,4,5,6,7,12 and 13 are directly involved in the measurement of barometric altitude, and blocks 8., 9, 10 and 11 are designed to display digital information about the current barometric altitude.

Barometric altimeter is as follows.

When measuring the flight altitude, the static pressure changes, which flows into the geometric housing of the barometric altimeter. The change in static pressure is perceived by the sensitive element aneroid box 1.

With a rise in height, the pressure on the aneroid box 1 decreases and under the action of elastic forces, it begins to expand. Moving through the hard center of the aneroid box 1 is transmitted to the bark 3 of the inductive sensor 2. A change in the position of the core 3 relative to the core of the inductive sensor 2 leads to the output of the error signal in the form of an alternating voltage proportional to the angle of deflection. This signal goes to the amplifier.

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the diverter 4, from the output of which the signal, taking values of +1 and -1, is fed to the first (controlled) input of the reversible counter 6. Reversible counter 6 accumulates the input pulses or reads them depending on the input signal. Thus, the expansion of the aneroid box leads to the accumulation of pulses in the counter, and compression - to read. The pulse generator 5 generates reference pulses for clocking the reversible counter 6. The output signal of the reversing counter 6, entering a code - voltage into the converter 7, is converted from. the value given by the binary number, to the proportional level of the alternating voltage. This voltage is applied to the control windings of the torque motor 12. The torque generated by the motor 12 is proportional to the control winding current. Under the action of the moment, the measles 3 of the inductive sensor returns to the middle (zero) position.

The signal from the output of the reversible counter 6 also enters the input of the adder 9. This signal is summed with the signals from the register 8, which is intended to introduce into the altimeter corrections to the change in static pressure at ground (P ,,). The total signal is fed to the input of the decoder 10, which is the code converter of the binary-decimal code to the seven-segment one with drivers for controlling the digital recorder 11, on which a signal proportional to the measured height is displayed.

In order to eliminate the temperature error caused by a change in the elastic modulus of the aneroid box, a temperature bimetallic compensator 13 was used, which is a bracket. This compensator provides temperature compensation for both of the first and second errors.

The use of a high-precision altimeter improves flight safety.

Claims (1)

Invention Formula A barometric altimeter containing an aneroid box connected to the core of an inductive sensor electrically connected to a converter amplifier, a bimetallic compensator connected to the aneroid box, a pulse generator, an electric recorder, so that Since it has a higher accuracy of measurement, it is equipped with a reversible counter with controlled and counting inputs, a code converter - voltage with a two-input combiner, a decoder and a register, while The peieepcHBoro meter's input is connected to the output of the amplifier-converter, and its counting input is connected to a pulse generator, the output of the reversible counter through a converter code - the voltage is connected to an electric motor, kinematically connected to the inductor sensor core, and the first input of the adder is connected to the output of the reversible counter , its second input is connected to the register, while the output of the adder is connected to the recorder via a deltator.