Biophysommeter for diagnosing the functional state of a person. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Biophysommeter for diagnosing the functional state of a person. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur

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Such a device, developed by Alexander Grachev and Alexei Starygin, allows for express diagnostics of a person's functional state depending on physical and mental stress. Conductivity of the skin and biopotentials are examined, which are compared with the "reference" indicators obtained during the normal state of the body (it is desirable to undergo a medical examination).

The device (Fig. 12) consists of two units: a biopotential meter and a skin resistance meter. The first one is made on the operational amplifier DA1 and the pointer indicator PA1 with a full deflection current of the pointer 100 - 200 μA, in the second one - the pointer indicator and the limiting resistor R4 are used. Depending on the type of measurement, either the X1 or X3 connector is connected to the X4 connector of the instrument. Power is supplied to the meters from a block made on a step-down transformer T1 and a bridge of diodes VD6 - VD9. The voltage to the operational amplifier is supplied from a divider of zener diodes VD3 - VD5.

(click to enlarge)

The biopotential meter is a sensitive voltmeter. The sensor is a rod with contact cylinders made of various metals (in Fig. 13 it is connected to the device). This provides a potential difference (mV) when the sensor is placed on the palms of both hands. Further, the signal is amplified and fed through pins 4, 1 of the X1 connector to the RAXNUMX indicator. The indicator needle deviates to a certain angle.

Biophysommeter for diagnosing the functional state of a person

The second meter is a sensitive ohmmeter. Its sensor is the same rod, but with the same (copper) cylinders. It is also installed on the palms of the hands, the fingers should not hug the cylinders. The degree of touch, contact determines the weight of the rod and, therefore, is constant for a given subject.

When setting up the device, connect the X3 connector to it and by selecting the resistor R1 (it can be made up of a series-connected constant resistor with a resistance of 10 kOhm and a variable resistance of 22 kOhm), the indicator arrow is deflected no further than the final division of the scale when the sensor is installed on the palm of wet hands. By selecting the same resistor R4, the indicator needle is set to the final division of the scale with a constant resistor with a resistance of 1 kOhm connected to slots 2 and 1 of connector X200.

The indicator scale can be calibrated either by a multimeter, or simply make a table of correspondence of the arrow deviation to the values of the measured parameters.

Author: L.Ponomarev, Tula

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