SU1512566A1 - Reflexometer - Google Patents

Abstract

The invention relates to medical technology. The purpose of the invention is to expand the range of measurements of the reflectometer by eliminating the influence on the measurement results of the initial location of the limb in the sensor measurement field. The reflexometer contains a transducer of the motor reaction of a limb into an electrical signal, the sensitive element of which is made in the form of a plate of a capacitive sensor, an amplifier 8 and a recording unit 9. The goal is achieved by introducing a full signal extraction unit 4, a unit for extracting a constant component 5 signal, adder 6 and controlled voltage divider 7. 2 Il.

Description

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- 31512566

The invention relates to medical technology, namely reflexometers, and can be used to study the state of the human neuroreflecting system.

The aim of the invention is to expand the measurement range of the device by eliminating the influence on the measurement results of the initial location of the limb in the sensor measurement field.

Fig, 1 shows a structural diagram of a reflexometer; Fig, 2 - waveform at the points indicated at 15

Fig 4 I,

The reflex meter contains a finite motor response converter 1 into an electrical signal, made in the form of successively connected 20 generator of 2 pulses and connected to a plate of a capacitive sensor 3 of the location of the final modulus — the pulse width generator, which output the full signal and the block 5 in the division of the constant component of the signal are connected respectively to the non-inverting and inverting inputs of the adder 6 g,

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the output of which is connected to the signal

the input of the controlled voltage divider 7, the control input of which is connected to the output of the full-signal output unit 4, and the output, respectively, through the amplifier 8 to the recording unit 9.

Reflexometer works as follows.

The patient's foot positioned in the measurement field of the capacitive sensor location of the limb. When the milk strikes the tendon, the limb is deflected, resulting in a change in the capacitance of the capacitor formed by the foot and the plate of the capacitive sensor, which causes a change in the duration of the pulses at the output of the modulator 3,

The amplitude of the signal at the output of block 4, the selection of the full signal: sieves both from the initial distance of the limb to the plate of the capacitive sensor, and from the amplitude of the displacement -. nor a limb resulting from a response to irritation. The amplitude of the signal at the output of block 5 of the gap and the constant component of the signal is determined only by the initial distance

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limb to the plate capacitive signal sensor,

The signal at the output of the adder 6 is proportional to the movement of the foot, since it is the difference between the output signals of blocks 4 and 5,

From the output of the adder 6, the signal is fed to the signal input of the controlled voltage divider 7, which varies the amplitude of the signal depending on the output signal of the block 4 of the complete 4 signal,

From the output of the controlled voltage divider 1, the signal is fed through the amplifier 8 to the recording unit 9,

Depending on the initial distance of the foot to the plate of the capacitive sensor, the output signal of the adder 6 can vary widely, due to the nonlinear characteristic of the capacitive sensor of the limb position (the pulse duration at the output of the transducer 1 is inversely proportional to the square of the distance between the foot and the sensor plate), Since the control input of the voltage divider 7 receives a full signal, the transmission coefficient of the block 7 depends on both the constant component and the instantaneous useful signal. This makes it possible to compensate for the nonlinearity of the sensor characteristic, which is approximately opposite to the transfer characteristic of unit 7, which expands the measurement range of the reflectometer.

Claims (1)

Invention Formula A reflexometer containing a transducer of a motor reaction of a limb into an electrical signal, the sensitive element of which is made in the form of a plate of a capacitive sensor of the location of a limb, an amplifier and a recording unit, so that, in order to extend the range of measurements of the reflexometer by eliminating the influence on the measurement results of the original limb location. In the sensor measurement field, a full signal extraction block, a constant signal component block, a spsmmator and a controlled voltage divider, and a transducer of the motor reaction of the limb into an electric 51151 The cue signal is in the form of a pulse generator connected in series and connected to a plate of a capacitance sensor of an impulse duration modulator, the output of the modulator being connected via a full signal extraction unit and a DC component of the signal 25666 directly with non-inverting and inverting inputs of an adder, the output of which is connected to the signal input of a controllable voltage divider, the control input of which is connected to the output of a full signal extraction unit, and the output through an amplifier with a recording unit. (ig.2