How to use a stroboscope

1. Display the current flash frequency

2. The LED indicator lights up, indicating that the time unit is minutes

3. The main menu button, the LED indicator lights up , for function selection

4. Intelligent regulator, which can be used for frequency and menu selection. When pressed, it is a stroboscope switch

5. Pressed to adjust the current frequency 2 times

6. Power switch

7. External synchronization interface

8. Press to 1/2 times the current frequency

9. Press to indicate external synchronization control

10. The LED indicator lights up, indicating that the time unit is seconds. 1) First estimate the movement frequency of the pattern. When measuring the operation of objects that work in straight lines, such as printing presses and inspection machines, the stroboscope is not used to measure the rotational speed of the "printing roller or motor", but to obtain synchronized still images to monitor the printing quality. In other words, when you want to adjust the flash rate of the stroboscope, you should adjust it based on the frequency of "how many pictures are pulled out per minute" rather than "how many meters it is pulled out per minute." In practice, we take a printing machine as an example:

Assuming that the printing machine prints 100 Meters per minute and the length of the printed drawing is 10cm, then the machine should print 1,000 drawings per minute. .The calculation method is as follows:

1 meter ÷ 10cm = 10 pictures………… means that each meter includes 10 pictures.

10 sheets × 100 meters (per minute) = 1000 sheets...means 1000 sheets of pictures are printed per minute.

At this time, if you adjust the flash rate of the stroboscope to 1000FPM, you can easily obtain clear synchronized still images. Therefore, if you are looking for synchronized still pictures of pictures during linear transportation, you should use the above calculation method to calculate how many pictures are printed per minute, and then adjust the flash rate of the stroboscope. This will make it easier to obtain synchronized still pictures. picture. In the same way, the output of the equipment can also be easily calculated.

2) Shine the flash source of the stroboscope on the object being measured.

3) Adjust from high frequency to low frequency to the estimated frequency, and then fine-tune until the measured object shows the first clear synchronized still picture. When confirming the still picture, you can use the appearance, outline, mark, etc. of the measured object to confirm whether it is exactly the same as the picture when it is stationary. You can also adjust its frequency by twice to confirm whether there are two overlaps. The image, thereby determining the image at twice the frequency, is definitely a real synchronized still picture, and is also its real RPM or FPM.

4) Read the value displayed on the digital screen, which is the number of operations per minute (RPM; FPM) of the object being measured.

The above steps are suitable for situations where the machine speed is relatively stable, because at this time the observed object also appears at a stable frequency, thus achieving better observation results. In addition, when the machine speed keeps changing, the frequency of the observed object also keeps changing. At this time, the internal control mode of flashing at a fixed frequency cannot adapt. At this time, the external control mode should be used. Through the automatic synchronization of the external sensor of the stroboscope, the signal of the external image is acquired. When a pattern comes, the stroboscope will flash once, thereby realizing automatic synchronization tracking of the pattern. The appearance of the specially designed and serialized stroboscope is as shown in the figure, and the main technical indicators are as follows:

(1) Power supply: AC 220 ± 10%V, 2A, 50Hz.

(2) Power: The maximum power is less than 200W. (3) Internal trigger frequency range: 1～500Hz.

(4) External trigger frequency range: 1～500Hz.

(5) Single working time: set arbitrarily by function keys (unit: 30 s).

(6)Ambient illumination: less than 10 000 lx.

(7) External trigger signal range: 5~12V pulse signal.

(8) Maximum irradiation width: depends on the length of the video flasher.

(9) Dimensions (length × width × height): 800mm × 115mm × 180mm (triple), 1250mm × 115mm × 180mm (quadruple). 1. Quick conversion of internal trigger/external trigger selection; double frequency and half frequency fast frequency modulation function; 2. When working in external trigger mode (using photoelectric signals), the automatic tracking function of the pattern can be realized;

3. Built-in memory, with automatic memory function of flash frequency and internal parameters, providing convenience for next use;

4. Using imported encoders and streamlined operating software, the knob adjustment is faster, more accurate and more practical. , convenient and handy to use;

5. The software has a strobe phase angle adjustment function;

6. Automatic flash stop and other functions save electricity while improving the strobe light. Long service life;

7. Use strobe light tubes imported from Germany and built-in high-performance switching power supply module to improve flash brightness and working reliability;

8. The latest product with advanced performance The first frequency is stable, has a long service life, and has very few faults.

Stroboscopes have been widely used in military industry, aerospace, steel industry, printing and packaging industry, paper industry, shipbuilding, automobile industry, tire testing, motor testing, measurement, product research and development and other industries. Specific applications: visual monitoring of aircraft engine operation and vibration; visual monitoring of product surface defects in steel cold rolling workshops and thin plate coating workshops; monitoring of cavitation phenomena in propellers, turbines and propulsion systems; surface quality inspection of paper products and paper Inspection of the web forming process; quality inspection of the printing and packaging production process: such as visual quality inspection of milk bag production; visual inspection of impellers; monitoring of fuel injection performance during engine development; vibration frequency analysis of exhaust gas treatment devices; tire testing; photography , high-speed imaging and video technology; monitoring of cable marking and twisting machine operation; non-contact rotational speed measurement; online product inspection in the beverage processing industry; microscope and endoscope applications of stroboscopic detectors with photoconductors, etc.

The printing machine vision system mainly includes: stroboscopic lighting source, CCD camera, image processing unit (or image capture card), image processing software, monitor, communication/input and output unit, etc. First, a camera is used to obtain the image signal of the target being measured, and the collected signal must be illuminated and sampled by the stroboscope according to the CCD sampling frequency (capturing high-quality images), and then converted into a digital signal through A/D conversion and sent to a dedicated image The processing system performs various operations to extract the characteristics of the target based on information such as pixel distribution, brightness and color, and then outputs the judgment results according to the preset discrimination criteria to control the drive actuator for corresponding processing.

In this system, high-quality light sources and lighting solutions are often the key to the success or failure of the entire system and play a very important role. It does not simply illuminate objects. The combination of light source and lighting scheme should highlight the object features as much as possible; there should be as obvious a difference as possible between the parts of the object that need to be detected and those unimportant parts, increasing the contrast; and at the same time, sufficient overall brightness should be ensured; Changes in object position should not affect the quality of imaging. In machine vision application systems, transmitted light and reflected light are generally used. For reflected light, the relative position of the light source and the optical lens, the texture of the object surface, the geometric shape of the object, the background and other factors should be fully considered. The selection of light source must comply with the required geometry, lighting brightness, uniformity, spectral characteristics of luminescence, etc.; at the same time, the luminous efficiency and service life of the light source must also be considered.

The system uses a camera in conjunction with a stroboscope to capture high-quality images of printed products on the production line, and displays the images on the monitor. The image refresh speed is adjustable to facilitate inspection personnel to inspect printed products. Sampling inspection, through the processing and analysis of captured images, can accurately detect vertical and horizontal color registration deviations and use a fully digital alternating frequency servo drive for position correction. At the same time, other important factors such as various colors of inks can be detected through quantitative analysis of relevant parameters of the image. quality, ink chips, etc. In modern industrial automated production, it involves a variety of inspection, measurement and parts identification work. The most common characteristics are continuous mass production and very high requirements for appearance quality. Usually this kind of highly repetitive work This can only be done by manual inspection. Accurate and rapid measurement of small dimensions, shape matching, color identification, etc. on the production line. Due to the high-speed movement of the observed object, the human eye cannot observe and inspect continuously and stably, and it is prone to errors. Stroboscope observation technology can better solve this problem.

Stroboscope, also called stroboscope or tachometer, is an optical measurement device that can make components that vibrate, rotate at high speed or move periodically into "stationary" components.

The stroboscope itself can emit short and frequent flashes. When the flashing frequency of the strobe is adjusted so that it is close to or synchronized with the rotation or movement speed of the object under test, although the object under test is high-speed It is moving, but appears to be moving slowly or relatively still. This phenomenon of persistence of vision allows people to easily observe the surface quality and operating conditions of high-speed moving objects visually, and the flash speed of the stroboscope is the object being detected. (For example: motor) speed and movement frequency (printing bag), you can also use a stroboscope to analyze the vibration of objects, the movements of high-speed moving objects, and high-speed photography, etc. The observation and inspection technology using stroboscopes has been widely used in Europe and the United States. With the rapid development of my country's economy, more and more industries have begun to use stroboscopes to help solve product quality inspection problems.