Sonar & Wave Qs: High-Freq Signals, Resolution & Feasibility

[adam84]

Why are High-Frequency (Ultrasound?) signals used in sonar applications, what are the properties of high frequency that make it suitable? Is it that High frequency signals are more directional than low-frequency signals? Is it that High signals have a smaller wavelength so they give a better resolution?

When a sound wave leaves a source what properties of the wave determine the width or the peripheral distance of the signal. for example how far will the wave travel from the sides of the source?

When a sound wave is reflected from an object what properties of the reflected wave differ from the source wave? does the frequency remain the same? does the amplitude change?

This all leads to my main question, Is it feasible to create a acoustic distance measuring program using a desktop computers speakers (20Khz signal) and microphone to measure distance of objects?

Thanks in advance

 

[adam84]

Any ideas?

 

[sir-pinski]

High-frequency signals, specifically ultrasound, are used in sonar applications because they have certain properties that make them suitable for this purpose. First, high-frequency signals have a shorter wavelength compared to low-frequency signals. This means that they can travel through water more easily and are less affected by obstacles or interference. This makes them ideal for use in underwater environments where obstacles and interference are common.

Additionally, high-frequency signals have a higher directionality compared to low-frequency signals. This means that they can be focused in a specific direction, allowing for more precise and accurate detection of objects. This is important in sonar applications where the goal is to accurately locate and track objects underwater.

When a sound wave leaves a source, the width or peripheral distance of the signal is determined by the frequency and amplitude of the wave. Higher frequencies have shorter wavelengths, which result in a narrower signal width. The amplitude of the wave also plays a role, with higher amplitudes resulting in a wider signal width.

When a sound wave is reflected from an object, the properties of the reflected wave can differ from the source wave. The frequency of the reflected wave may remain the same, but the amplitude can change depending on the reflective properties of the object. This change in amplitude is what allows sonar systems to detect and differentiate between various objects underwater.

As for the feasibility of creating an acoustic distance measuring program using a desktop computer's speakers and microphone, it is possible but may not be as accurate as other methods. The accuracy would depend on the quality of the speakers and microphone, as well as any interference or background noise that may affect the measurements. Additionally, the range of the measurement may be limited by the power and capabilities of the speakers and microphone. It would be more feasible to use specialized sonar equipment for more accurate and precise distance measurements.