SU1206735A2 - Apparatus for measuring strength of variable and pulse magnetic fields - Google Patents

Description

The invention relates to magnetic measurements, can be used to measure variable and pulsed magnetic fields in a wide frequency range and is an improvement of the invention according to the author's basic certificate No. 20595.

. The aim of the invention is to expand the functionality of the device by measuring pulses of complex shape.

Fig, 1 shows a structural diagram of the proposed device; Fig. 2 is a block diagram of a control pulse shaping unit; Fig, 3 - timing charts of the device.

A device for measuring the voltage of variables and pulses of magnetic fields contains a measuring coil 1 connected to an integrating amplifier 2 with a resistor 3 enclosed by a feedback circuit

including connected in series.

4 voltage divider, emitters

a repeater 5, an electronic key 6 and a memory block 7. The output of the integrating amplifier 2 is connected to the measuring input of the analog-digital converter 8, the control input of which is connected to the second output of the unit; 9 formations: control pulses, the first output of which is connected to the control input of the electronic switch 6, the first input to the additional measuring coil 10, and the second input to the output of the first zero of the organ 11, whose input is connected to the output of the integrating amplifier 2,

The control pulse shaping unit 9 consists of the first driver I2, the input of which is the second input 13 of the shaping unit 9. control pulse, and the output is connected to the I-input of the RS-flip-flop 14, the first input 15 of the control-pulse-shaping unit 9 is connected to the input of the second null-organ 16, the output of which is connected to the S-input of the short-circuiting trigger 14 17, which was the second output of the impuser forming unit {{bs control}.

five

0

five

The device works as follows

Measuring coil 1 and additional measuring coil 10 are placed in the magnetic field under study. Electric signals proportional to the first derivative of the magnetic field strength are fed to the integrating amplifier 2 and the input 15 of the control pulse shaping unit 9, Crushes the second zero-organ 16 and sets using a trigger 14 state of the logical unit at the output 18 of the control pulse shaping unit 9. The electronic key 6 opens and breaks the active negative coupling circuit of the integrated amplifier 2 which integrates the signal from the measuring coil 1, restoring the shape of the voltage pulse. When the magnetic field strength reaches the extremum, the magnitude of the signal of the additional coil 10 becomes zero, causes the second zero-body 16 to be triggered. In this case, the second shaper 17 generates a pulse at the output 19, according to which the analog-to-digital converter 8 converts the signals

0 digitalization formation

If the magnetic field pulse has several peaks of intensity, then the corresponding number of control signals of the analog-digital pulse converter, however, is formed at the output 19, however, the integration of the signal does not stop.

The end of the integration, t, e, the moment of the electronic key 6 closure,

0 leading to the restoration of an active negative coupling circuit, is determined by the first null organ 11, which is triggered when the voltage at the output of the integrating amplifier 2 becomes

5 equals zero. On the trailing edge of the pulse at the output of the first null-gorgan 11, the first driver 12 generates a pulse that returns the RS flip-flop 14 to the zero state on the output. This leads to the acquisition of the electronic key 6 and the restoration of the feedback circuit. The integration of the signal stops and the drift of the integrating amplifier 2 is compensated.

five

0

Hit

L // 2

Claims (2)

1. DEVICE FOR MEASURING TENSION OF VARIABLE AND PULSE MAGNETIC FIELDS according to ed. St. P 920595, characterized in that, in order to expand the functionality of the device when measuring pulses of complex shape, a zero-organ is additionally introduced into it, and the control pulse generation unit is equipped with a second input connected to the output of the zero-organ, the input of which is connected to the output integrating amplifier. 2. The device according to π. 1, characterized in that the pulse forming unit is made in the form of a second null organ, a first and second formers, and an RS trigger, the output of which is connected to the first output. control pulse generation unit, the R-input is connected to the output of the first driver, the S-input is connected to the output of the second 'zero-organ and the input of the second driver, the output of which is connected to the second output of the control pulse generation unit, with the first and second inputs of the unit® the formation of control pulses / are respectively the inputs of the second * zero-organ and the first driver. 1 1206735