| 摘要 |
<p>A coating material dispensing system (10) that dispenses coating material onto a substrate (18) in a moving pattern or fiber (20) is provided with a monitor that senses a medium such as sound near the space between the dispensing device nozzle (16) and the substrate (18), and extracts information relating to the pattern motion, and generates a signal representative of characteristics of the motion of the pattern in the space. One or more transducers (38) extract the information, and the extracted information is analyzed, preferably by comparison of a frequency spectrum of the signal with a spectrum of standard signal, to detect deviations in the system operation from desired criteria, and optionally, to control parameters of the system (10). In another embodiment, plural spaced transducers (38) detect the phase or orientation of the moving pattern and remove background noise, by inverting, summing, multiplying, and otherwise combining the signals. The invention is useful for detecting malfunctions of the system components, for real-time closed loop control of the process, and for quality control inspection of dispensing device components during manufacture. <IMAGE></p> |
