SU393667A1 - DEVICE FOR CONTACTLESS CONTROL OF PHYSICAL PARAMETERS OF A MOVING OBJECT - Google Patents

Description

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The invention can find the use of fl in different fields of industry, nalimer in hichmicheskoy, in which case, when non-continuous automatic control of the parameters of moving objects.

From the device for contactless monitoring of the physical parameters of a moving object, containing two echolocation channels, each consisting of an acoustic receiving-emitting head, an impulse generator, a selector amplifier, and a selector imager, the output of the nepBOiro amplifier of the channel is connected to the generator input, in the waiting mode of the second channel. In addition, the devices contain a measuring time. The inputs of which are connected respectively to the generator of the first channel and through the shaping stage to the amplifier of the second channel, and the first output is connected to the recording unit.

The prior art devices do not allow the -control with high accuracy due to the unstable rate of ultrasound propagation in the gaseous medium surrounding the object being monitored.

In the proposal, the device eliminates this disadvantage due to the fact that the RAO is equipped with an installed “emd on opposite sides of the object in the same plane as the main head; M | And a reflector and an additional head, Vkoy, connected to the second output of the generator (First Channel) and additional selector amplifier The amplifier inputs are connected to the additional head and the selector pulse shaper, and the output to the controlled input of the first channel generator.

Schemes and the proposed device for controlling the physical parameters of a moving object is shown in the drawing.

Device Contains / Whale:

first channel: 1 - acoustic voice, 2 - it has a pulse generator, 3 - “supervises my object; 4- selector amplifier, 5 - selector imPSlsov shaper;

Second channel: 6 - impulse generator, 7 - acoustic head, 8 - selector amplifier, 9 - shaper of selector Emuls;

measuring unit: 10-forming cascade, 11 - time measuring unit, 12 - recording unit;

additional channel: 13 - acoustic head, / 4-reflector, 15 - selector amplifier.

The principle of the actual control device, for example, the maximum size of a moving object in a cross section, is as follows.

The acoustic head 1, excited by an electrical impulse generator 2, radiates a short ultrasonic pulse towards the object 3 passing by it. The ultrasonic impulse reflected from object 3 is received by that head and converted into an impulse electrical signal, fed to a selector amplifier 4, controlled by a rectangular and myosymo former 5, which is triggered by a geerator 2.

The pulse signal from the amplifier 4 is fed to the control input of the next-generation oscillator 6, the pulse of which excites the acoustic head 7 of the second channel, radiating the ultrasonic pulse in the direction of the other side of the object being monitored 3. The ultrasonic pulse separated from the object is received by the head 7, converted into an electrical signal that is passed through a selector amplifier 8, controlled by the pulses of the imaging unit 9, and the shaping cascade 10.p. one of the pz inputs of the imitation module of the i / i unit //.

To the second input, the time of the measuring unit comes a pulse from the generator 2 of the first channel. As a result, the block //. Measures the interval equal to the difference between the shells by the period following the impulses of the generator 2 and the total time of propagation of the echo pulses in the first and second channels. This interval is proportional to the size of the controlled object. The output electrical voltage of unit 11, proportional to the time interval measured, is supplied to the recording unit 12.

The readings of the device depend on the stability of the period of sending pulses of the generator 2 and on the speed of ultrasound. In order to eliminate the measurement error caused by these instabilities, additional heads were introduced into the proposed device; ka 13 and a reflector 14, which are installed next to the main heads / and 7, and the selector amplifier 15.

The heads, 13, being excited: given by the pulse of the generator 2, emit an ultrasonic pulse that passes by object 3 to the reflector 14 and, after reflection from it, returns to this head. The latter transforms the received echo pulse 1 V electrical pulse, which, through a selector amplifier

15, controlled by a rectangular pulse of the former 5, is fed to the input of a pulsed generator, agora 2 for its synchronization with a period equal to the echo and mpulse time in the up to 1 channel.

Thus, the period of sending pulses of the generator is inversely proportional to the speed of ultrasound. Since the output voltage is measured by an analog or digital unit 11, proportional to the product of the duration of the EM0 interval and the frequency of these intervals, the display of the device becomes independent of the changes in the ultrasound velocity, which increases the accuracy and stability of measurements .

Generator 2 is performed on the basis of a blocking generator in the sense of free oscillations, the frequency of which is set to a smaller value, inverse of the maximum time of the double run of the ultrasonic pulse between the main heads in the absence of a controlled object.

Subject invention

A device for contactless monitoring of physical parameters of a moving object, naimer, of maximal cross-sectional size, containing two echo-location channels located on the object sides, each of which consists of an acoustic receiving-emitting head, a pulse generator, a selector amplifier and a selector pulse former , the output of the amplifier of the first canal is connected to the input of the generator of the second canal, and the time of the measuring unit, the inputs of which are separately connected to the generator at the first channel and through the forming kaokad to the amplifier of the second channel, and the output is connected to the registering blocks, characterized in that, in order to increase accuracy, the OIO is equipped with a reflector installed on opposite sides of the object and an additional head connected to the second output of the first channel generator, and an additional selector amplifier, whose inputs are connected to the additional head and shaper of the pulse pulses, and the output to the controlled input of the nepiBoro generator Nala,

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