The development of a high-speed digitizer system to measure time-domain voltage pulses in nanoseconds range is presented in this work. The digitizer design includes a high performance digital signal processor, a high-bandwidth analog-to-digital converter of flash-type, a set of delay lines, and a computer to achieve the time-domain measurements. A program running on the processor applies a time-equivalent sampling technique to acquire the input pulse. The processor communicates with the computer via a serial port RS-232 to receive commands and to transmit data. A control program written in LabVIEW 7.1 starts an acquisition routine in the processor. The program reads data from processor point by point in each occurrence of the signal, and plots each point to recover the time-resolved input pulse after n occurrences. The developed prototype is applied to measure fluorescence pulses from a homemade spectrometer. For this application, the LabVIEW program was improved to control the spectrometer, and to register and plot time-resolved fluorescence pulses produced by a substance. The developed digitizer has 750 MHz of analog input bandwidth, and it is able to resolve 2 ns rise-time pulses with 150 ps of resolution and a temporal error of 2.6 percent.
En este artículo se describe el diseño y la implementación de un robot tipo acuático para trabajar como un sistema distribuido para la limpieza superficial de piscinas. La comunicación se realiza mediante la red WLAN entre el robot y una computadora personal con el objetivo de implementar algoritmos de control que permitan optimizar las rutas y poder experimentar con perturbaciones en el medio. Para la recolección de la suciedad se utiliza una malla colectora para contener objetos que flotan como lo pueden ser hojas de árbol. Estos robots están fabricados en acrílico, acetato de etileno y vinilo utilizados para flotar; Cuentan con la electrónica de potencia y control, sensores de proximidad, motores, un magnetómetro y módulo de comunicación inalámbrica.
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