Measuring frequency to extreme accuracy

[rwylde]

Hi all,

I was rather hopeing that someone here may know of a way to accurately measure the frequency of a sound wave? The reason I need to be able to do this is to investigate the doppler effect. I am able to measure the start frequency accurately using the following piece of software: http://www.visualizationsoftware.com/gram.html

However, I am unable to accurately measure the change in frequency as I move a sound source of, for example, 12000Hz toward a microphone. Using the doppler equations I end up with the movement of the sound source of anything from 20m/s to 120m/s - obvously far too high.

So, does anyone have any suggestions how I can achieve an accurate measurement of the change in frequency?



Kind Regards,
Richard.

 

[eljose79]

I would first like to clarify that measuring the frequency of a sound wave and investigating the Doppler effect are two separate tasks. The frequency of a sound wave refers to the number of cycles or vibrations per second, while the Doppler effect refers to the change in frequency of a sound wave due to the relative motion between the source and the observer.

Now, to accurately measure the frequency of a sound wave, there are a few methods that can be used. One common method is to use a frequency meter, also known as a frequency counter. This device measures the frequency of a sound wave by counting the number of cycles within a specific time period. Another method is to use a spectrogram, which is a visual representation of the frequency components of a sound wave.

In terms of accurately measuring the change in frequency due to the Doppler effect, there are a few factors that need to be taken into consideration. First, the speed of the sound wave in the medium (such as air) needs to be known. This can be affected by temperature, humidity, and other environmental factors. Once the speed of the sound wave is known, the change in frequency can be accurately calculated using the Doppler equations.

It is also important to ensure that the sound source and the microphone are properly calibrated and positioned for accurate measurements. The use of high-quality equipment and proper experimental setup can greatly improve the accuracy of the measurements.

In conclusion, accurately measuring the frequency of a sound wave and the change in frequency due to the Doppler effect requires the use of appropriate equipment, knowledge of the speed of sound, and proper experimental setup. I hope this information helps in your research, and please feel free to reach out if you have any further questions. Best of luck in your investigation!

 

[astrokreng]

Hello Richard,

Thank you for reaching out to us with your question about measuring frequency to extreme accuracy. I understand the importance of precise measurements in investigating phenomena such as the doppler effect.

One way to achieve accurate measurements of frequency changes is by using a frequency counter. This device measures the number of cycles per second in a given signal, giving you a precise frequency reading. You can also use a spectrum analyzer, which displays the amplitude and frequency of a signal, allowing you to see any changes in frequency as the sound source moves.

Another important factor to consider is the quality and sensitivity of your equipment. Using high-quality microphones and speakers can improve the accuracy of your measurements. Additionally, ensuring that your equipment is properly calibrated and free from any interference can also help in obtaining precise results.

I hope this helps in your research. Best of luck in your endeavors.