To calculate the Fresnel Distance (D):
\[ D = \frac{d^2}{4 \cdot \lambda} \]
Where:
Fresnel distance, also known as the Fresnel zone, is a concept in wave optics that describes the regions of constructive and destructive interference created by an obstacle in the path of a wave. It is particularly important in the fields of radio wave propagation, optics, and acoustics. The Fresnel distance is the distance over which the wavefronts remain relatively undisturbed by obstacles. It is used to determine the clearance required to avoid significant signal loss or distortion. This concept is crucial in designing communication systems, ensuring that the signal remains strong and clear over long distances.
Let's assume the following values:
Using the formula:
\[ D = \frac{(0.1)^2}{4 \cdot 0.0005} = 5 \text{ meters} \]
The Fresnel Distance is 5 meters.
Let's assume the following values:
Using the formula:
\[ D = \frac{(0.2)^2}{4 \cdot 0.001} = 10 \text{ meters} \]
The Fresnel Distance is 10 meters.