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    Difference between Laser and CNC Engraving Machine
    The most obvious difference between a laser engraving machine and a CNC engraving machine is that the laser engraving machine performs engraving by laser melting or burning. CNC engraving machine uses digital technology to control the cutting tool, bit or laser head, ultrasonic head for engraving. The laser engraving machine can be a CNC engraving machine, and the CNC engraving machine can also be equipped with a laser head for laser engraving. Therefore, the two have a cross and intersection relationship. Although both the laser engraving machine and the CNC engraving machine adopt a numerical control system, they have different working principles and different mechanical structures. In comparison, the CNC engraving machine has a simpler structure. Through the control of computer numerical control system, the engraving machine can automatically select the appropriate engraving tool to engrave on the X, Y, and Z axes of the machine tool. The biggest difference in structure between laser engraving machine and CNC engraving machine is that the cutter of laser engraving machine is a complete set of optical components, while the cutter of CNC engraving machine is a variety of entity engraving cutters.
    Laser Distance Meter vs. Ultrasonic Distance Measure
    Laser distance measurement and radio detection radars follow the same operating principle: Emit the laser towards the target object, measure the time for the laser to travel back and forth, and calculate the distance by multiplying the recorded time and the velocity of light. The laser is characterized by such merits as high directivity, monochromaticity, and power, which play critical roles in measuring a long distance, judging the target object's direction, raising the reception system's SNR, and guaranteeing the measurement accuracy. With these features, laser distance meters receive growing attention. Laser radars, which have been developed based on laser distance meters, measure not only distances but also the target object's direction, movement velocity, and acceleration.