33 results about "Digital delay generator" patented technology

A femtosecond-nanosecond ultra-pulse laser smoothing processing system for ceramic matrix composite materials, including a computer control system, the computer control system is respectively connected with the ultra-pulse optical path system, monitoring system and laser processing system, and the computer control system first controls the ultra-pulse optical path The system emits light and adjusts parameters, and then feedbacks the status of the optical path through the monitoring system. After confirming that the ultra-pulse optical path system is normal, the sample preparation is finally performed through the laser processing system; the computer control system includes a computer, and the computer is connected to the femtosecond laser and the laser through a digital delay generator. Nanosecond laser; the ultra-pulse optical path system includes femtosecond laser double pulse sequence optical path, nanosecond laser single pulse sequence optical path and femtosecond-nanosecond laser beam combining optical path; the present invention utilizes femtosecond laser double pulse sequence and nanosecond laser single pulse Sequences are combined to form an ultra-pulse laser with pulse timing control and parameter matching coupling to achieve efficient and high-quality surface smoothing of ceramic matrix composites.

The invention discloses a high-speed train energy-saving resistance reducing method and device. Air flow is induced to change on a headstock windward side so as to change the layering condition of an air flow boundary layer, and the headstock wind resistance is reduced. By changing input voltage, the speed and size of induced air flow generated by a plasma generation device are controlled, the plasma generation device is adjusted at the same time, the geometric structure and position of an electrode of the plasma generation device are changed, the speed and direction of the generated induced air flow are adjusted, and induced air flow needed for achieving the optimal resistance reduction of a high-speed train can be obtained; and the two ends of the plasma generation device are connected with an electrical parameter measurement device, a power amplifier switch thyristor is triggered by a digital delay generator, and a pressure monitoring system is connected with a PC terminal. The high-speed train energy-saving resistance reducing method and device can effectively reduce pneumatic resistance borne in the driving process of the high-speed train and achieve the purposes of saving energy and improving operation safety.

The invention discloses a device and a method for measuring flame form and temperature synchronously. According to the method, the transient flame form is detected with high-speed schlieren, and the flame temperature is detected with TDLAS (tunable diode laser absorption spectroscopy); detection zones of the high-speed schlieren and the TDLAS are focused in the same detection zone in a constant-volume combustion bomb respectively, the high-speed schlieren and the TDLAS are controlled synchronously by a digital delay generator, and synchronous detection for the flame form and temperature in thetransient flame propagation process is realized. The device comprises the visual constant-volume combustion bomb, a light source, a pinhole diaphragm, an achromatic Fourier transform lens, an adjustable diaphragm, a high-speed camera, a laser, a laser driver, a function generator, an etalon, a reflector, a photoelectric detector, a data acquisition unit and the like. According to the device and the method, the problem about synchronous measurement for the transient flame form and temperature is solved, the clear flame form is obtained with the high-speed schlieren, the high-temporal-resolution flame temperature is obtained with the TDLAS, and combustion characteristics of transient flame are researched through combination of two results of the flame form and temperature.