39results about How to "Maintain energy" patented technology

A semiconductor wafer marking apparatus and a semiconductor wafer marking method includes a laser head unit including a flowcell having a laser radiation region and a laser source radiating laser energy on the laser radiation region in response to an input current. An optical system radiates a laser beam on the semiconductor wafer. A cooling water reservoir stores cooling water. A pipe is disposed in the flowcell and connected to the cooling water reservoir. A marking interlock system detects leakage of cooling water from the pipe, an abnormal temperature of the laser radiation region, and an abnormal input current supplied to the laser source, and generates a marking interlock signal to terminate a marking operation of the semiconductor wafer. A marking unit turns off the laser source to terminate the marking of the semiconductor wafer in response to the marking interlock signal.

The present invention provides an FMCW broadband life detection radar breathing and heartbeat signal extraction algorithm. Compared with the prior art, the algorithm has the advantages that breathing and heartbeat signals of multiple persons can be obtained simultaneously, the boundaries and energy of reconstructed breathing signals can be very well kept by using Coiflets wavelets compared with traditional frequency-domain filtering, especially processing conducted on short-time signals is obvious, higher harmonics of the breathing signals are filtered out by adopting a double-coefficient based LMS self-adaptive filtering algorithm, and the self-adaptive filtering algorithm does not need additional reference signals. Due to the fact that a degressive search step size coefficient is adopted in the algorithm, the heartbeat signals can be better retained while breathing signal harmonics are filtered out, the heartbeat signals can be rapidly converged by selecting the appropriate search step size coefficient and adopting the double-coefficient based LMS self-adaptive filtering algorithm, and smaller stable imbalance is kept in longer time, so that finally separated heartbeat signals are more accurate in frequency component within a long time.