OSCILADOR POR SÍNTESIS DIGITAL DIRECTA PARA EXPERIMENTOS DIDÁCTICOS DE ONDAS Y VIBRACIONES (DIRECT DIGITAL SYNTHESIS OSCILLATOR FOR DIDACTIC EXPERIMENTS ON WAVES AND VIBRATIONS)
Resumen
Algunos instrumentos comerciales, para realizar experimentos de fenómenos ondulatorios o vibracionales superan los US$900 dólares, por lo que su adquisición resulta difícil. En este artículo, se presenta el desarrollo de un oscilador para experimentos de ondas y vibraciones, como una herramienta para verificar modelos matemáticos y realizar experimentos para encontrar frecuencias de resonancia o nodos de vibración en: cuerdas, alambres, resortes, tiras metálicas o plásticas, y placas de Chladni. El instrumento se basa en un microcontrolador PIC18F27Q43 que incluye un convertidor digital-analógico. El prototipo puede operar a frecuencias de 0 a 100 Hz y 100 Hz a 1 k Hz. Tiene una resolución de 0.025 Hz, lo cual se considera adecuado para los fines didácticos y similar a las especificaciones de instrumentos de bajo costo. El prototipo tiene una carcasa de aluminio y un control remoto alámbrico de PVC. El costo total se estima en US$250 dólares.
Palabras Clave: experimentos de acústica, generadores de señales, microcontroladores PIC, ondas y vibraciones.
Abstract:
Some commercial instruments used to perform undulatory or vibrational phenomena experiments cost over US$900 dollars, making them difficult to acquire. In this paper, the development of an oscillator for experiments on waves and vibrations is presented, as a tool to verify mathematical models and perform experiments to find resonance frequencies or vibrational nodes in ropes, wires, springs, metallic or plastic strips, and Chladni plates. The instrument is based on a PIC18F27Q43 microcontroller, which includes a digital-to-analog converter. The prototype can operate with frequencies from 0 to 100 Hz and 100 Hz to 1 kHz. It has a resolution of 0.025 Hz, and this is considered appropriate for didactic purposes and comparable to the specifications of low-cost instruments. The prototype has an aluminum case and a PVC wired remote control. It is estimated to have a total cost of US$250 dollars.
Keywords: experiments on acoustics, signal generators, PIC microcontrollers, waves and vibrations.
Texto completo:
324-341 PDFReferencias
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