Device for measuring the linear dimensions of moving objects

 

(57) Abstract:

The invention relates to measuring equipment. The purpose of izobreteniya is to improve the accuracy in the determination of small linear dimensions of the object. This is achieved by introducing into the device control object 18, the data on the dimensions of which are recorded in the storage device 15 as a fixed constant velocity movement of the controlling object. When determining the size of the measured object when the speed of its movement, different from the reference velocity of the moving object, the measured value is adjusted by the appropriate factor received from the divider 16. 1 Il.

The invention relates to measuring technique and can be used in systems of technical control in optical systems.

A device for measuring the linear dimensions of objects [1], in which by means of a continuous laser is measuring the linear dimensions of the object. In it, the laser is mounted on the platform, moved with drive controlled by the actuator control module. The speed sensor platform travel provides information about the velocity of the platform in the processing unit, where the records of the final information about the object size after continuous irradiation by a laser beam.

Drawback - the need for additional illumination of the object and the inability to measure the linear dimensions of an object with a complex configuration.

A device for measuring the linear dimensions of moving objects [2], in which by means of a continuous laser is irradiating the measured object. The emitted light energy passes through the opening of the reflective mirror with a hole and feed, mounted on the platform. The reflected light energy reflected from the irradiator and the reflective mirror with a hole and falls on the photodetector where it is converted into an electrical signal, which is supplied to the processing unit of the signal at the input of the amplitude selector. The latter produces a signal at the moment of changing its amplitude in the analyzer. If the amount of change of the amplitude corresponds to the configuration of the inspected object, the analyzer outputs a signal, the duration of which depends on the size of the object and the speed of movement of the platform. This signal shall permit the passage of pulses the number of which depends on the size of the scanned object, and the frequency of the speed of movement of the platform. This number is displayed in the display unit, which sbsa from the speed sensor, representing a bulky design. In addition, the pulse frequency is limited by the technical capabilities of the speed sensor that is not possible with a sufficient degree of accuracy to measure small linear dimensions.

The purpose of the invention is to simplify the design and increase the accuracy in the determination of small linear dimensions of the object.

This is achieved by introducing into the processing unit of the signal amplitude selector, two blocks define the duration of the signal, each of which consists of a clock generator, schema matching and counter, as well as the introduction of unicast permanent storage, divider, multiplier and control of the object, while the light energy from the irradiator is reflected from the reference object and comes back to the irradiator, and the output of the photodetector through the first input unit, processing the signal through additional amplitude selector and the first input of the first block define the duration of the signal connected to the first input circuit matches with the second input, connected to the output of the clock generator and an output connected to the first input of the counter, the second input is a second input of the first block definition deities second input block signal processing, via a second input of the second block define the duration of the signal from the second counter input, the first input connected to the output of the circuit matches, and having a first input connected through a first input of the second block define the duration of the signal, with the output of the analyzer and having a second input connected to the output of the clock generator. The output of the meter across the output of the second block for determining the duration of the signal and the first output of the processing unit of the signal connected to the first input of the multiplier, the output of which is connected to the second input of the display unit and the second input - output divider, having a first input connected to the output unicast permanent storage device, and a second input connected through the second output unit of the signal processing and the output of the first block to define the duration of the signal with the output of the counter.

The drawing shows a functional diagram of the device.

It contains a panel reset 1, block 2 signal processing, the amplitude selector 3, the analyzer 4, block 5 define the duration of the signal, the clock generator 6, the schema matching 7, a counter 8, block 9 display, additional amplitude selector 10, block 11 define the duration of the signal, tachometer 17, the control object 18, the source 19 of the radiation, the movable platform 20, the actuator 21, block 22 of the drive control, the irradiator 23, the reflective mirror 24 with a hole and a photodetector 25.

Light energy from a source 19 of the radiation passes through the reflective mirror 24 with a hole to feed 23 and reflected from the reference object 18, is again sent to the irradiator 23 having rigid connection with the movable platform 20, is rigidly connected with a gear 21 having an input connected to the block 22 by the drive control.

Then, from the irradiator 23 light energy is again supplied to the reflective mirror with a hole and then to the photodetector 25, the output of which is connected via the first input unit 2 signal processing: through the amplitude selector 3 - input analyzer 4 and through the first input unit of signal processing 2, additional amplitude selector 10, the first input unit 11 define the duration of the signal to the first input of schema matching 13, having a second input connected to the output of the clock generator 12, and an output connected to the first input of the counter 14. The second input through the second input unit 11 define the duration of the signal, the second input unit 2, the signal processing is connected to the output of the AC 5 with a second input of the counter 8, first input connected to the output of the circuit matches 7, having a first input connected through a first input of the block define the duration of the signal from the output of the analyzer 4, and a second input connected to the output of the clock generator 6.

The output of the counter 8 through the output unit 5 and the first output unit 2 is connected to the first input of the multiplier 16, the output of which is connected to the second input of the display unit 9, and the second input with the output of the divider 16 having a first input connected to the output unicast permanent storage device 15, and a second input connected through the second output unit of the signal processing and output unit 11 with the output of the counter 14.

The operation of the device is as follows.

The source 19 of the radiation, which may be a helium-neon continuous laser emitter, carries out emission of light energy with a narrow radiation pattern. The beam from the radiation source passing through the apertures of the reflective mirror 24 with a hole and lands on the irradiator 23, which represents a reflective mirror located on the movable platform 20. The platform moves with the actuator 21, the driven unit 22 of the drive control. In the process Drogo needs to be defined.

Thus the control object is located in front of the measured object and has a pre-known linear dimensions. Reflected from the object light energy again hits the irradiator 23, reflected on it and then is reflected from the reflective mirror 24 with a hole and falls on the sensitive area of the photodetector 25. In the photodetector of the light energy is converted into an electrical signal, which is supplied to the unit 2, to the input of the amplitude selector 3 and additional selector 10. The control surface of the object 18 is made of a material whose reflectivity is different from the reflectivity of the scanned object. Additional amplitude selector 10 outputs a signal, the amplitude of which has a certain value characteristic of a signal formed by reflection of light energy from the reference object 18. The amplitude selector 3 selects the signal amplitude which is characteristic of the signal formed by reflection of light energy from the scanned object, and generates a pulse at the time of change of the amplitude in the analyzer 4. The number of these pulses is characterized by the configuration of the scanned object. Analyzer scitable 5 define the duration of the signal.

The design of the amplitude selector 3 and the analyzer 4 is not different from the design of the corresponding nodes of the prototype. The duration of the signals from the outputs of the analyzer 4 and additional amplitude selector 10 depends on the speed of movement of the movable platform 20 and the linear dimensions of the irradiated objects. The outputs of the additional selector 10 is fed to the input circuit 13 matching unit 11, allowing passage through this scheme of clock pulses from the clock generator 12 to the input of counter 14 which counts these pulses and outputs them to the first input of the divider 16. To the second input of the divider 16 receives data from the unicast permanent storage device 15, where it is recorded in the calibration process, which is carried out as follows.

After setting the control object 18 is controlling the irradiation. The speed of movement of the movable platform 20 is defined as a reference. After exposure of the control object by a laser beam with an oscilloscope is determined by the information in the counter 13 and written to a persistent storage device 15. Next, using the panel reset 1 set the counter 13 in the source put the and output of the divider 16 after exposure of the control object will have a coefficient which in the case of differences from the reference speed of the mobile platform will be more or less than one.

The value of this coefficient is multiplied in the multiplier 17 to the code coming from the counter 8 of block 5. This counter receives clock pulses from the clock generator 6, a resolution the passage of which is given schema matching 7 analyzer 4. Thus, the multiplier 17 is correction information of the linear dimensions of the inspected object-dependent differences in the speed of movement of the movable platform 20 from the reference. From the output of the multiplier 17, the information is passed to the block 9 display that displays.

Information displayed on the display unit 9, is considered to be true after exposure of the inspected object by a laser beam. The dump occurs with relief panel 1, which are also set to the initial state of the counters 8 and 14.

Thus, thanks to the introduction of additional electronic assemblies and the control object simplifies the design and increases the accuracy of detection of small linear dimensions.

DEVICE FOR MEASURING the LINEAR DIMENSIONS of MOVING OBJECTS, comprising the drive control, the photodetector, relief panel, the display unit, the processing unit of the signal consisting of a series of amplitude selector and analyzer, characterized in that, to increase the accuracy of detection of small linear dimensions of the object, it is provided with additional amplitude selector and two nodes define the duration of the signal, each of which consists of a clock generator, schema matching and counter, as well as unicast permanent storage device, a divider, a multiplier and a control object, the first node determining the duration of the signal connected to the output of the analyzer processing unit signal, a second node coupled to the output of the additional analyzer, connected to the input of the amplitude selector, the irradiator installed between the control object and a mirror with holes and optically connected with them, the output of the photodetector through the AUX input of the amplitude selector, which is the first input of the processing unit of the signal, and through the first input of the first circuit matches the first node to define the duration of the signal, the second input of which is connected with a clock generator this circuit, connected to the first input of the first counter circuit, the inputs dopolnitelnym input schema matches the second node define the duration of the signal, the second input of which is connected to the clock generator and the output to the first input of the counter to the second node, the second input of the counter is connected to the second input of the counter of the first node and the second input signal processing unit connected to the panel reset associated with the output display unit, the outputs of the counters of the first and second nodes define the duration of the signal are, respectively, the first and second outputs of the processing unit of the signal, are connected respectively to the first input of the multiplier, the second input is connected to the output of the divider and the second input of the divider, the first input of which is connected with unicast permanent storage device, and the output of the multiplier is connected to the input of the display unit.

 

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