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Beat Frequency


Beat frequencies are periodic vibrations that result from the addition and subtraction of two or more sinusoids. For example, in the case of two turbine aircraft engines that are rotating at nearly the same frequency but not precisely at the same frequency; Four frequencies are generated:(f1) the rotational frequency of turbine one, (f2) the rotational frequency of turbine two, (f1 + f2) the sum of turbine rotational frequencies one and two, and (f1 - f2) which is the difference or "beat" frequency of turbines one and two. The difference of the two frequencies is the lower frequency and is the one that is "felt" as a beat or "wow" in this case.

 

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Sources:    
National Instruments www.windmill.co.uk www.omega.com
   

 

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Experts in the design of sensor instrumentation treat smart sensors and sensor systems, presenting an alternative to the classical approach to data acquisition and covering signal processing methods for digital and quasi-digital sensors. Coverage ranges from a detailed analysis of available conversion methods to software level smart sensor design and smart sensor buses and interface circuits. Material is of interest to instrumentation and measurement professionals, advanced students and researchers in microelectronics, and engineers and developers of microsensor systems. Kirianaki is affiliated with the International Frequency Sensor Association, Ukraine.