RU2360258C1 - Compensation accelerometre - Google Patents

Abstract

FIELD: instrument making.

SUBSTANCE: present invention is meant for use as a detecting element in stabilisation and navigation systems and can be used in devices for measuring compensation type mechanical quantities. The compensation accelerometre contains series connected to data inputs of the detecting element, angle-sensing transducer, preliminary and selective amplifiers, comparator, signal level converter, OR circuit, reserve binary counter, adder, electronic switch, current generator, moment detector, and negative feedback. Introduction into the compensation accelerometre of amplifiers, comparators, signal level converter, low-pass filter, adder, logic unit and OR circuit, reserve binary counter, adding binary counter, amplitude detector and modulator, connected in the negative feedback, allows for application of a discrete control signal on the moment detector.

EFFECT: discrete control signal provides for a wider bandwidth of the device and first order astaticism.

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Description

The invention relates to measuring equipment and can be used as an element in stabilization and navigation systems. It can find application in devices for measuring mechanical values of the compensation type.

A device for measuring accelerations is known (RF patent No. 2098833, IPC ⁶ G01P 15/13 publ. 10.12.97) containing a sensor element including two fixed electrodes and a movable plate, three amplifiers, two resistors, while the output of the first amplifier is connected to the first resistor, and the input of the second amplifier is connected to the second resistor and is the output of the device. To increase the noise immunity, under the influence of electrical interference, a reference voltage source, an electric signal generator, two transistor pairs, three resistors, two capacitors are introduced into it, which allow, due to the coverage of the amplifier with negative feedback, to compensate for electrical interference.

The disadvantage of this device is the low accuracy of the measurement, since the choice of gain, with hard negative feedback, is limited by the condition of stability of the system.

The closest in technical solution is the device (RF patent No. 2308039 IPC ⁶ G01P 15/13 (2006.01) published in Bulletin No. 28, 10/10/2007) containing a sensing element, an angle sensor and a torque sensor with an electronic key, two negative reverse connection, one from the output of the angle sensor to the input of the torque sensor through pre-and selective amplifiers connected in series through the information inputs, the first comparator, the first signal level converter, a pair of logic circuits AND, the first pair of ZhSG, a pair of circuits EXCLUSIVE OR, the main reversing a binary counter, a binary multiplier and an electronic key, a second negative feedback is introduced from the output of the selective amplifier to the inputs of a pair of EXCLUSIVE OR circuits through an adder, an amplitude detector, a high-pass filter, a second comparator, a second signal level converter, and a second pair of ZhSG , in addition, the additional inputs of the pair of logic circuits AND and the adder are connected to the output of the GON, and the additional inputs of the first and second pairs of JSG control circuits are connected to the output of auxiliary frequency generator through the auxiliary frequency generation circuit, the auxiliary input of the binary multiplier is connected to the output of the auxiliary reversible binary counter, the control circuit is introduced into the reverse circuit, the second input of the electronic key is connected to the output of the current generator, and the output of the main reversible binary counter is a digital output of the measuring device accelerations.

The disadvantage of this device is the low accuracy of the measurement, due to the accuracy of the analog amplifiers and the threshold element. In addition, the accuracy of the measurement depends on the parameters of the electronic key circuit that selects the information. This error leads to an aperture error inherent in a similar sampling and information processing scheme.

The present invention is to expand the bandwidth of the device and improve the accuracy of the measurement.

This is achieved due to the fact that in the compensation accelerometer, which contains, in series with the information inputs, a sensing element, an angle sensor, one of the inputs of which is connected to the output of the reference voltage generator, preliminary and selective amplifiers, negative feedback from the first output of the selective amplifier, in which includes a comparator, a signal level converter, a reversible binary counter, the output of which is a digital output of a compensation accelerometer, electronic a beam, the second input of which is connected to the output of the current generator, and a torque sensor, as well as an adder, one of the inputs of which is connected to the output of the reference voltage generator, an amplitude detector, two OR circuits, and an auxiliary frequency generator, a logic block is introduced whose input is connected to the output signal level converter, and outputs with corresponding inputs of OR circuits, two comparison circuits, a trigger, a high-pass filter, a second comparator and a modulator, while the reversible binary counter is connected to the electronic key via the first comparison circuit and the trigger, the second output of the selective amplifier is connected to the OR circuits through an adder, an amplitude detector, a high-pass filter, a second comparator and a modulator, the second inputs of the modulator and logic unit are connected to the output of the second comparison circuit, the second input of the first the comparison circuit is connected to the auxiliary frequency generator through a summing binary counter, and the additional input of the second comparison circuit is connected to the output of the reference voltage generator i.

The introduction of a preliminary and selective amplifiers, a high-pass filter, comparators, an amplitude detector, a modulator, comparing devices, a trigger, a signal level converter, OR circuits, a logic block, a reversing and summing binary counters, adder into the compensation accelerometer made it possible to create a device for measuring accelerations with an extended bandwidth and with astatism for deviation.

Figure 1 shows a functional diagram of a compensation accelerometer, figure 2 is a structural diagram of a compensation accelerometer, figure 3 is a transient in an analog model of a compensation accelerometer.

The compensation accelerometer contains a sensing element 1, the deviation of which captures the angle sensor 2. The output of the angle sensor 2 is connected to the input of the pre-amplifier 3, the output of which is connected to the input of the selective amplifier 4. One of the outputs of the selective amplifier 4 is connected to the input of the first comparator 5, the output of which is connected with the input of the signal level converter 6. The output of the signal level converter 6 is connected to one of the inputs of the logic block 7. The outputs of the logic block 7 are connected to the corresponding inputs of the pair OR circuits 8 and 9. The outputs of OR circuits 8 and 9 are connected to the inputs of the reversible binary counter 10. Another output of the selective amplifier 4 is connected to the input of the adder 11, the output of which is connected to the input of the amplitude detector 12. The output of the amplitude detector 12 is connected to the input of the high-pass filter 13. The output of the filter 13 is connected to the input of the second comparator 14. The output of the second comparator 14 is connected to one of the inputs of the modulator 15. The outputs of the modulator 15 are connected to the corresponding inputs of the circuits OR 8 and 9. The output of the reverse binary counter 10 is connected to one from the inputs of the first comparison circuit 16, the output of which is connected to the input of the trigger 17. The output of the trigger 17 is connected to one of the inputs of the electronic key 18, the other input 18 is connected to the current generator 19. The output of the electronic key 18 is connected to the input of the torque sensor 20. Another input the first comparison circuit 16 is connected to the output of the summing binary counter 21, the input of which is connected to the output of the auxiliary frequency generator 22. The output of the reference voltage generator (GON) 23 is connected to the inputs of the angle sensor 2, adder 11 and the second comparison circuit 24. The output to Ora comparison circuit 24 is connected to an input of modulator 15 and to an input of a logic unit 7.

The internal contents of preliminary and selective amplifiers, comparators, a high-pass filter, a reversing and summing binary counters, an adder, a signal level converter, OR circuits, a current generator, an electronic key circuit, a voltage reference generator and auxiliary frequency generation are described in the book: P. Horowitz, W. Hill. The art of circuitry. M.: Mir, t.1-3, 1993.

A device for measuring acceleration works as follows. Under the action of acceleration, the inertial moment acts on the sensitive element 1. Under the influence of this moment, the sensor 1 deviates, which is detected by the angle sensor 2, the windings, the excitations of which are connected to the output of the reference voltage generator GON 23. The signal from the angle sensor 2, after amplification by the preliminary amplifier 3, is fed to the input of the selective amplifier 4, which selects signal at the carrier frequency f ₁ (GON). The signal in the form of voltage ± U ₄ from amplifier 4 is fed to the input of the first comparator 5. The voltage from comparator 5 is fed to the input of signal level converter 6, in which a signal is generated in the form of a voltage from 0 to ± 2.5 (V). The signal level converter 6 provides the necessary signal level for the operation of logic block 7. The signal from output GON 23 is supplied to the second input of logic block 7 through the second comparison circuit 24. Logic block 7 performs the operation of multiplying signals from output 6 and output 24, and triggers 7 is carried out depending on the phase of the deviation 1. The signal from the output of the logic unit 7 is fed to the corresponding inputs of the pair of circuits OR 8 and 9. The signal from the output of the selective amplifier 4 is also fed to one of the inputs of the adder 11, to the other input of which A signal is received from the output of the GON 23. The signal from the output 11, at the carrier frequency of the GON 23, is fed to the input of the amplitude detector 12, which converts the signal at the carrier frequency into a DC signal. The high-pass filter 13, connected to the output from the amplitude detector 12, provides stability and a given transient in the compensation accelerometer. The signal from the output of the filter 13 goes to the input of the second comparator 14, and then to the input of the modulator 15. The signal from the output of the modulator 15 goes to the inputs of a pair of circuits OR 8 and 9. As a result of the logical addition of signals by circuits 8 and 9, depending on the phase of deviation 1 , we have a logical "0" or a logical "1". Pulses from 8 or 9 are fed either to the summing input of the reversing binary counter 10, or to the subtracting input 10. Information equal to the difference between the "positive" and "negative" pulses is transferred from 10 in the first comparison circuit 16, according to the pulse of the summing binary counter 21. The generation of count pulses, circuit 16, is carried out in accordance with the frequency of the auxiliary frequency generator 22 connected to input 21. Pulses from 16 are fed to the input of trigger 17, which is triggered by the sign from 16, and then to one of the inputs of the electric ronnogo key 18. Another input of the electronic key 18 is connected to a current generator 19. The signal 18 in the form of a level in accordance with the sign of deviation of the sensor element 1 is supplied to the input torque sensor 20, which compensates for an angular deviation 1 caused by the action of acceleration. The signal from the output of the reversible binary counter 10 is a discrete output of the device, proportional to the input acceleration.

The introduction of amplifiers, comparators, a signal level converter, a high-pass filter, an adder, a logic unit and OR circuits, a reversible binary counter, a summing binary counter, an amplitude detector and a modulator included in the feedback into the compensation accelerometer allows implementing a discrete control signal to the torque sensor . A discrete control signal provides first-order astatism and the expansion of the bandwidth of the proposed device. The analog model of the compensation accelerometer (Fig. 2) is modeled with the parameters of the sensitive element, filter and summing binary counter: T = 0.2 s, T ₁ = 0.2 s, T ₂ = 0.01 s, K ₁ = 0.1, with the width of the ambiguity zone of the threshold element, included in the feedback equal to 0.01, and the simulation results are presented in figure 3. From the analysis of the transition process it follows that the device is stable, stability provides a high-pass filter, and at the output of the model we have a discrete control signal that provides bandwidth expansion and deviation astatism.

Claims (1)

Compensation accelerometer containing a sensing element sequentially connected through the information inputs, an angle sensor, one of the inputs of which is connected to the output of the reference voltage generator, preliminary and selective amplifiers, negative feedback from the first output of the selective amplifier, which includes a comparator, signal level converter, and reverse a binary counter, the output of which is the digital output of a compensation accelerometer, an electronic key, the second input of which is connected with the output of the current generator, and a torque sensor, as well as an adder, one of the inputs of which is connected to the output of the reference voltage generator, an amplitude detector, two “OR” circuits and an auxiliary frequency generator, characterized in that a logic unit is inserted into it, the input of which is connected with the output of the signal level converter, and the outputs with the corresponding inputs of the OR circuit, two comparison circuits, a trigger, a high-pass filter, a second comparator and a modulator, while the reversible binary counter is connected to the electronic key through the first comparison circuit and trigger, the second output of the selective amplifier is connected to the OR circuits through an adder, an amplitude detector, a high-pass filter, a second comparator and a modulator connected in series to the information inputs, the second inputs of the modulator and logic unit are connected to the output of the second comparison circuit, the second input the first comparison circuit is connected to the auxiliary frequency generator through a summing binary counter, and the additional input of the second comparison circuit is connected to the output of the reference voltage generator I am.

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