SU1348660A1 - Optronic function vibrator power supply - Google Patents

Abstract

This invention relates to a measurement technique. The aim of the invention is to expand the capabilities of the device by measuring the logarithmic damping factor. The optoelectronic functional vibration transducer contains a linear gas-discharge indicator (ICH) 1, optically coupled to a photoreceiver 2, which is rigidly fixed on the object under study and electrically connected to one of the arms of the bridge circuit 3. When a mechanical oscillation of the object occurs, the photoreceiver 2 will also begin to oscillate and its illumination will vary in accordance with these fluctuations, which will lead to a change in voltage at the output of circuit 3. Amplifier 4 amplifies the output voltage of circuit 3 and supplies it to the input of the SID 1, changing the length of the column of gas light in order to restore the initial state of the circuit 3. Thus, the signal at the output of the circuit 3 is similar in shape to the mechanical damped oscillations of the object. The first positive signal amplitude from the output of circuit 3 is memorized through the first key 7 by the first amplitude detector 9, the second through the second key 8 by the second amplitude detector 10, from where they go to dividing unit 11 and then to logarithmic unit 12, where the logarithmic decrement decrement is calculated. Further positive amplitudes of the signal from the output of circuit 3 do not arrive at amplitude detectors 9 and 10, since the signal from dividing unit 14 closes keys 7 and 8. 2 Il. Q 3 fco 00 05 SG Fig. /

Description

The invention relates to a measurement technique and can be used to measure the amplitude and the logarithmic decrement of freely damped oscillations.

The aim of the invention is to expand the functionality due to the possibility of measuring the logarithic damping decrement.

Figure 1 shows the block diagram of the proposed vibrator; Fig, 2 - diagrams of the device.

The optoelectronic functional i vibration transducer contains a linear gas-discharge indicator (DIG) 1, a photodetector 2, optically coupled to the DIG 1, a bridge circuit 3, in one of whose arms is connected a photographic receiver 2, an amplifier 4, the output of which is connected to the input of DIG 1, in series connected pulse generator 5, trigger 6 and first key 7, the second input of which is connected to the output of bridge circuit 3, input of amplifier 4 and input of driver 5 of pulses, the second key 8 whose first input is connected to second output of trigger 6 and second input trigger 6, the second v input is connected to the output of the bridge circuit 3, the first amplitude detector 9, the second amplitude detector 10, the serially connected dividing unit 11 and the logarithmic unit 12, the first input of the dividing unit 11 are connected to the output of the first amplitude detector 9, the input of which is connected to the output of the first key 7, the second input of the division unit 11 is connected to the output of the second amplitude detector 10, the input of which is connected to the output of the BTOpqro key 8, connected in series to the differentiation unit 13 and the division unit 14 into three, the output of which is connected to t the secondary inputs of the first and second keys 7 and 8, the input of the differentiation unit 13 is associated with the output of the driver 5 pulses and the first input of the trigger 6,

The device works as follows.

In the absence of mechanical oscillations of the object, the photodetector 2 is illuminated by a column of light of the gas of the LGI 1 gas half. In this case, scheme 3 is in a state close to equilibrium. At the output of circuit 3 there is a voltage determined by the coefficient

0

five

0

0

Statism of the LI system - photo detector - bridge - amplifier. This voltage, uschunnoe amplifier 4, feeds the SHI 1 so that the column of light of the gaseous gas spreads to the distance along the SHI.

At occurrence of damped mechanical oscillations of the photoreceiver object; 2, it is rigidly connected to it, it also begins to oscillate, and its illumination varies in accordance with these oscillations. When moving the photodetector 2 along the propagation of the glow of the MGR 1, its illumination decreases, and when moving towards the propagation of the glow, the illumination of the photoreceiver 2 increases. This leads to a change in the state of circuit 3, the output voltage of which repeats the change in illumination of the photodetector 2, i.e. its variations in size and shape correspond to mechanical damped oscillations of the object. The voltage at the output of circuit 3 is amplified by amplifier 4, fed to the input of LGI 1, changing the length of the column of gas light in order to restore the initial state of circuit 3. The output voltage of circuit 3 is an electric two-polar damped signal, similar in form to the mechanical damped vibrational displacements of the object. Therefore, the task of the mechanical logarithmic damping decrement is to find the logarithmic damping factor

0 curve Uj (Fig. 2a). Dp this goal, you must first find the relationship UMAKCJ. In the circuit, this is done as follows: From the output of circuit 3, the signal is received

5 at the input of the imager 5, the output

the voltage of which has a rectangular shape, the same amplitude and positive polarity. This voltage is applied to the first input of the D-trigger 6, which is tilted by the leading edge of the rectangular pulses Ui (Fig. 2b). From the moment the first pulse arrives and until the second pulse arrives at the first output Q of flip-flop 6, there is a signal (Fig. 2c) that opens the key 7, and the voltage Uj through the key 7 passes to the first amplitude detector 9, At the output of the first amplitude de5

five

The vector 9 has a voltage proportional and arriving at the first input of dividing unit 11, the Alalogov amplitude detector has the property of storing the amplitude value of the voltage, which is provided by a large time constant of the capacitor discharge circuit. Therefore, with the arrival of the second pulse of the imaging unit 5, when the trigger 6 changes its state, at its first output Q the pulse is not present and the key 7 is closed, the output of the first amplitude detector 9 remains voltage proportional to UHC, the second pulse of the imaging generator 5 flips the trigger 6 and now a signal appears at the second output Q, which opens the second key 8, and a second positive voltage amplitude and begins to pass to the second amplitude detector 10, at the output of which a voltage appears proportional to. -postupaet the second input unit 1 1 digit, the output voltage which yields a value proportional to the ratio, and "" uc / UstAHc, the latter will prologarfimirovana unit 12. The logarithm give logarithmic decrement.

The voltage from the output of the imaging unit 5 also flows through the differentiation unit 13 to the division unit 14 into three (Fig. 2e). Therefore, when the third pulse of the driver 5 passes, the third short pulse enters the input of the block 14 and, (FIG. 2d). Block 14 is triggered, a signal appears at its output, which closes the keys 7 and 8, thereby terminating the

48660

start-up of the third positive amplitude voltage Uj B blocks 9 and 10.

Claims (1)

Invention Formula Optoelectronic functional a vibration transducer containing an optical radiation source, made Q as a linear gas discharge indicator, associated with an object a photodetector optically coupled to a linear gas discharge indicator, serially connected A bridge circuit and an amplifier, the output of which is connected to the input of a linear gas discharge indicator, the photodetector is included in one of the arms of the bridge circuit, which is equivalent to 2Q in order to expand its functionality, it is equipped with serially connected pulse generator, trigger, first key, first amplitude detector, division unit and logarithm unit, serially connected with a second key and second amplitude detector, serially connected with a differential unit 2Q and a unit dividing three, the output of which is associated with the third input of the first key and the third input of the second key, the second input of which is associated with the second input of the first key, the input ormirovatel pulses and the output of the bridge circuit, a first input coupled to the second output of the flip-flop and the second input flip-flop, which first communication Szasz input, to the input of differentiating unit, the second output 35., 40 an amplitude detector associated with a second. eye input block division. FIG. 2