SU1530172A1 - Sensor for recording low-frequency electric field of biological objects - Google Patents

Abstract

The invention relates to medical devices for recording and measuring the physiological characteristics of biological objects and allows for improved measurement accuracy by eliminating the influence of a pulse wave. The device consists of a measuring head connected to the recording system and consisting of a body 6 with a screen 7, a microphone 8 on a membrane 9 mounted on a rod 10 with a measuring plastic 11. The measuring head 1 is mounted on the surface of the patient's body in the area of interest. An excitation system creates a magnetic field that causes the membrane 9 to vibrate and is transmitted to plate 11. When plate 11 is placed in a measured electric field, an alternating electric current is induced in it, the amplitude of which is proportional to the measured field. 2 Il.

Description

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The invention relates to medical technology, in particular, to d / t devices for recording and measuring the physiological characteristics of biological objects.

The purpose of the invention is to improve the measurement accuracy by eliminating the influence of the pulse wave.

FIG. 1 11) a block diagram of the device; in fig. 2 - sensor design.

The device comprises a measuring head 1 connected to the measuring amplifier 2, the detector 3 and the excitation generator 4 connected to the power supply 5. Measuring head 1 consists of

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Unit 4 excites alternating current in the induction coil of microphone 8, creating a magnetic field causing vibration of the membrane of microphone 8 at the frequency of generator 4. Since membrane 9 is rigidly connected to the measuring plate 11, it vibrates at the same frequency. When a vibrating plate 11 is mixed, an alternating electric current with a generator frequency of 4 and an amplitude proportional to the measured field and reflecting its dynamics in time is induced in the measured electric field. The variable signal from the output of J2 is fed to the input of the detector 3 to highlight the envelope

housing 6, which is rigidly fixed Ek-i5 current, i.e. the inverse transform of the signal occurs, which can be used for discrete measurements of the level of the electric field due to the surface electrical gap.

wounds, made in the form of a hemisphere 7. Inside the case 6 is placed an electromagnetic drive, made in the form of a microphone 8 on a membrane 9 connected to the excitation generator 4 and mounted on a dielectric rod 10, on the opposite end of which a measuring element in the form of a plate 11 is mounted, which is connected to the input of the measuring amplifier 2 with the power of a conductor, BbinOviHeHHoro V of the helix 12. In this case, the microphone 8 is fixed in the housing 6 of the measuring head 1 with epoxy glue 13.

The device works as follows.

The measuring head 1 of the sensor is mounted on the surface of the subject in the area of interest. In this case, the measuring plate 11 of the sensor is located at a distance of 0.5 cm from the surface of the body and is limited by the dimensions of the screen 7.

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Claims (1)

Invention Formula A sensor for detecting a low-frequency electric field of biological objects, comprising a housing with a measuring element m, a recording device, wherein the measuring element is placed in an open-ended screen with holes, characterized in that, in order to improve the measurement accuracy by eliminating the influence of a pulse wave, it is equipped with an electromagnetic actuator, made in the form of a microphone on a membrane, which is fixed on the rod and connected to a high-frequency generator, while the open screen is made in the form of a semi sphere rigidly fixed to the body. Unit 4 excites alternating current in the induction coil of microphone 8, creating a magnetic field causing vibration of the membrane of microphone 8 at the frequency of generator 4. Since membrane 9 is rigidly connected to the measuring plate 11, it vibrates at the same frequency. When a vibrating plate 11 is mixed, an alternating electric current with a generator frequency of 4 and an amplitude proportional to the measured field and reflecting its dynamics in time is induced in the measured electric field. The variable signal from the output of J2 is fed to the input of the detector 3 to highlight the envelope current, i.e. the inverse transform of the signal occurs, which can be used for discrete measurements of the level of the electric field due to the surface electrical gap. Invention Formula A sensor for detecting a low-frequency electric field of biological objects, comprising a housing with a measuring element m, a recording device, wherein the measuring element is placed in an open-ended screen with holes, characterized in that, in order to improve the measurement accuracy by eliminating the influence of a pulse wave, it is equipped with an electromagnetic actuator, made in the form of a microphone on a membrane, which is fixed on the rod and connected to a high-frequency generator, while the open screen is made in the form of a semi sphere rigidly fixed to the body. Gratilo Compiled by E. Titova Tehred I. Veres- Circulation 643 (Rig.1 Proofreader M. Maksimishinets