SU842889A1 - Device for monitoring and signalling object displacements - Google Patents

Description

The invention relates to means of monitoring and control, more precisely to means of monitoring biological objects, and can be used for security alarm systems in biology, medicine, etc. A device for controlling the motor activity of objects is known, which contains an amplifier tuned to an ultrasonic one; frequency, electroacoustic transducers connected to its input and output so that positive feedback is formed, causing generation in the amplifier. The movement of an object in the control zone formed by the output and input converters causes the H3MeHei6ie pair of generated signal C l.lv The specified device has the stability of the parameters of the generated signal. The closest to the present invention is a device for monitoring and saping the movements of an object, comprising a generator, the output of which is connected to the first inputs of the controlled phase-to-phase. rotator and phase meter, the output of which through the filter is connected to the indicator and the second input of the controlled photo-rotator, whose output is connected to the radiating electrode, the output of the receiving electrode is connected to the second input of the phase meter 12. The disadvantage of this device is the limitation of sensitivity due to signal phase fluctuations due to destabilizing effects factors (power instabilities, temperature drifts, etc.) to the matching and shaping devices of the measuring channel, as well as the instrumental phase error meter In addition, the introduction of positive phase feedback can lead to self-excitation of the entire device. These phenomena lead to an increase in the number of false positives of the device.

The purpose of the invention is to increase the sensitivity and reduce the likelihood of false alarms of the device.

The goal is achieved in that a device containing a series connected generator, a controlled phase shifter and a radiating electrode, a receiving electrode, a phase meter whose reference input is connected to the generator output, the first filter whose output is connected to the indicator input, an adjusting phase shifter, two switches , two peak detectors, a second filter, an arithmetic unit, a frequency divider and a pulse shaper, the first input of the first switch is connected to the receiving electrode, the output is controlled through the adjusting phase shifter connected to the second input of the first switch, the output of which is connected to the input of the phase meter, output F1

The 1V is connected to the input of the second switch, the first and second outputs of which are through the first and second respectively peak detectors are connected to the first and second inputs of the arithmetic unit whose output is connected to the input of the first filter; the output of the first peak detector is connected via the second filter the control input of the controlled phase shifter, the generator output is connected via a frequency divider to the input of a pulse shaper, the first and second outputs of which are connected to the control inputs of the first and second commutators.

The structural scheme of the proposed ycTpducTBia is shown in the drawing.

The device for monitoring and signaling the movements of an object contains a generator 1, a controlled phase shifter 2, radiating 3 and receiving 4 electrodes, the first switch 5, the adjusting phase shifter 6, the phase meter 7, the second switch 8, two peak detectors 9, and 9, the arithmetic unit 10, filters 11 and 13, indicator 12, frequency divider 14, shaper 15 pulses of controlled object 16,

The generator 1 is connected to the input of the controlled phase shifter 2 and to the reference input of the phase meter 7, the output of the controlled phase shifter 2 is connected to the radiating electrode 3 and to the input of the adjustment phase shifter 6, the receiving electrode 4 and the output of the adjustment phase shifter 6 are connected to the inputs of the switch 5, the output of which is connected with the measuring input of the phase meter 7. The output of the phase meter 7 is connected to the input of the switch 8, the outputs of which are connected to the inputs of two peak Detectors 9, the outputs of which are connected to the inputs of the arithmetic unit 10, and course of one of the peak detector 9 via the filter 13 is connected to a control input of phase shifter 2. Yield arithmetic 9 through the filter 11 is connected sovhdom indicator 12. The control input switches 5 and 8 are connected to the outputs of the formation. bodies 15, whose input is through a divider 14 frequency with the output of the generator 1. The controlled object-16 is placed in the zone between the radiating 3 and the receiving 4 electrodes.

The generator 1 serves to generate a harmonic or pulsed voltage with a high frequency and amplitude stability sufficient for the normal operation of the phase detector. As the generator 1 can be used harmonic or relaxation generator, stabilized by quartz,

Control: my. phase shifter 2 serves to provide phase feedback, as well as for initial installation and calibration of the device. As an phase shifter, for example, an RC circuit with a varicap or a field effect transistor can be used as a control element.

Measuring 3 and receiving 4 electrodes are used to create an alternating electric field in the controlled area. As electrodes can be used metal plates, wires and t, n,

The adjusting phase shifter 6 serves to supply a voltage of the same amplitude and phase to the input of the phase meter 7 as that on the receiving electrode 4. A capacitor can be used as an adjustment phase shifter 6 or a tunable circuit.

Switches 5 and 8 are used to serially connect the receiving electrode 4 or the output of the adjustment phase shifter 6 to the input of the phase meter 7 and to switch the output of the phase meter

7 between the inputs of peak detectors 9,

8 The quality of switches 5 and 8 can be used electromagnetic

5.842889

relays, reed switches or electronic keys on bipolar or MOS transistors. Phase meter 7 compares the reference signal produced by generator 1 with the voltage modulated by the motor activity of the object, coming from the receiving electrode 4, or with the signal coming from the output of the adjusting phase shifter 6, and produces a voltage proportional to the phase change. A phase meter 7 can be used with a phase discriminator with appropriate matching devices. Peak detectors 9 serve to convert sequences of amplitude-modulated pulses from the output of the second switch 8, c. continuous signal. Peak detectors 9 serve to envelope the envelope of amplitude-modulated pulses from the outputs of the switch 5 and 8, and can be performed on semiconductor diodes according to well-known circuits. The arithmetic unit 10 produces a voltage proportional to the difference of the signals present at its inputs. As an arithmetic unit 10, for example, a differential amplifier can be used. Filters 11 and 13 serve for frequency selection of signals. Passive and active low-pass filters or bandpass filters can be used. The indicator 12 converts the information about the motor activity of the object 16 into an easy-to-perceive operator form. As an indicator 12, an oscilloscope, a recorder, a threshold light or sound signal feeder, etc. can be used. The pulse shaper 15 produces pulses to control the switches 5 and 8. As the driver 15, for example, a transistor switch can be used. The frequency divider 14 serves for business. neither the frequency of the signal produced 1; o generator 1, a certain number of times in order to provide the necessary switching duration and synchronization switching. As a frequency 14, for example, a digital counter can be used. The device works as follows.

Generator I produces a variable voltage with frequency fp. The radiating electrode 3 creates in the surrounding space an alternating electric field, which induces an emf at the receiving electrode 4, which enters one of the inputs of the Si switch. The second input of the switch 5 receives the voltage from the output of the adjusting phase shifter 6, These voltages alternately enter the input of the measuring channel of the phase meter 7 with a frequency much lower than the frequency f, but greater than the average frequency of the signal of the motor activity of the object 16, where it is compared with the reference voltage coming from generator I. Phase meter 7 produces a voltage proportional to the phase difference between the signals in the reference and measurement channels. At the same time, when the input of the phase meter 7 is connected to the receiving electrode 4, its output is present as a useful signal due to the motor activity of the object 16, as well as interference caused by fluctuations of the output voltage of the phase meter 7, At the same time intervals when the input of the phase meter 7 is connected to the output of the adjusting phase shifter 6, only a disturbance voltage is present at its output. Switch 8 is synchronized with switch 5 connects you-, the phase meter 7 to the inputs of two peak detectors 9j and 9g, which convert the PAM signal generated by the switch into continuous voltages corresponding to either the sum of the useful signal and interference (the first peak detector 9) , or only interference (second detector 9). At the output of the arithmetic unit 10, a voltage is generated that contains only the useful signal. This voltage is selected by the filter 11 and supplied to the indicator 12. At the same time, the voltage from the output of the peak detector 9 through the bandpass filter 13 is fed to the control input of the controlled phase shifter 2. so that negative phase feedback is formed. Thus, additional compensation / interference occurs. The depth of the feedback is determined by the transfer coefficient of the peak detector 9 and filter 13, the advantage; the predictable device is to increase the ratio

Claims (1)

Claim A device for monitoring and signaling the movements of an object, containing a series-connected generator * a controlled phase shifter and a radiating electrode, a receiving electrode, a phase meter, the reference input of which is connected to the output of the generator, the first 15 filter, the output of which is connected to the indicator input, characterized in that, in order to increase the sensitivity of the jb device, an adjustment phase shifter two comp-20 mutators, two peak detectors, a second filter, an arithmetic unit, a frequency divider and a pulse shaper were introduced , the first input of the first switch is connected to the receiving electrode 25, the output of the controlled phase shifter through the adjustment phase shifter is connected to the second input of the first switch, the output of which is connected to the input of the phase meter, the output of the phase meter is connected to the input of the second switch, the first and second outputs of which are peak detektory.podklyucheny to first and second inputs of the arithmetic unit, whose output is connected to the input of the first filter, the output ^x of the first peak detector through a second filter with union of co-managing control input of the phase shifter, the output of the generator via a frequency divider coupled to the pulse shaper Sat input, first and second outputs are connected to control inputs of the first and second com * · mutators.