The hottest high-speed and accurate digital laser

2022-10-15
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The invincible combination of high-speed and accurate digital laser marking system

digital servo control technology and high repetition frequency fiber laser realizes high-quality marking

using digital state space servo control and "low-order mode" high repetition rate, the extruded carbon fiber composite ink pulsed fiber laser technology, which will form a part of the rocket nozzle, can realize high-speed and accurate laser marking, and is used in production lines that require automatic control and monitoring, high output and minimal laser maintenance. The significance of this laser technology is that it matches with the high-speed scanner to achieve high-quality marking

the digital servo controller includes a high-speed digital signal processor (DSP) to perform all necessary calculations for the digital control of the servo motor in torque, speed or position mode. The controller interface connected with control and feedback signals (such as motor current and voltage, position encoder measurement) is provided by high-resolution analog-to-digital conversion (ADC) integrated circuit. Parameter tuning can be extracted from the self-tuning process and stored digitally in hardware. It can also eliminate the manual potentiometer adjustment and problems caused by analog circuit drift and aging. In addition, using high-performance DSP technology can also implement advanced motor control algorithms, such as model-based high-performance broadband predictive control. The prediction model is derived from the state space equations of laser scanner motor motion and observed motor position, as well as other dynamic variables (such as simulated current and voltage). The servo mechanism predicts the movement of the laser scanner in advance and generates a motor voltage signal to ensure that the source signal is limited by the power system. Compared with the analog servo mechanism, the driver with integrated state space model can greatly enhance the bandwidth

compared with existing lasers (such as nd:yag, nd:yvo4 and CO2 lasers), pulsed fiber lasers have many advantages, such as laser parameter M2

high performance servo mechanism also has such characteristics: during rapid acceleration and deceleration, torque is generated to control the motor. Figure 2a and figure 2B respectively show the horizontal line marking pattern when the servo mechanism of the digital and analog system performs the same marking speed (10kmm/sec). Two areas of different point spaces can be seen in the two drawings. Area 1 is an area with different point spaces, corresponding to the acceleration/deceleration phase of the scanner. Area 2 is an area with a constant point space, corresponding to the stable scanning phase of the scanner. Since the length (~310um) of region 1 in Figure 2a is shorter than that of region 1 in Figure 2B (~2600 UM), we can deduce from this phenomenon that the short-term burst performance of digital servo mechanism in dealing with torque pulse is better than that of analog servo mechanism. This inference is also an argument for the previous marking results, strengthening our statement that the performance of digital state space systems exceeds that of analog systems in terms of speed

in the third experiment, we also studied the difference of the scanning galvanometer angle response to the input command between the digital system and the analog system, indicating that the digital state space servo technology has been improved. As before, two servos drive a CTI 6230 scanning galvanometer equipped with a 10mm mirror. In Figure 3, the black line and the red line represent the angular path (time-dependent) of the servo controller and the analog servo controller when the load acts preferentially along the fiber direction using digital. The rotation angle of the mirror is drawn along the Y axis and is represented by any internal unit. The path of the digital servo mechanism cannot be input on the new starting line, which closely matches the input command, and neither of the two tracks can be recognized. The red line is deformed due to 1 The dynamic response is good because the analog PID servo mechanism cannot accurately track the input signal due to the limitation of bandwidth

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