Differences

This shows you the differences between two versions of the page.

--- un:radio-inter [2024/09/08 23:17] – [1.2 Correlation interferometer] asad
+++ un:radio-inter [2024/09/08 23:26] (current) – [1.2 Correlation interferometer] asad
@@ Line 59: / Line 59: @@
 Here you see the fringe oscillations (cycles) for a point source located on the celestial equator observed by a two-element interferometer lying along the terrestrial equator creating a 15-$\lambda$ long east-west baseline.
-The fringes oscillate around a zero mean and there are exactly 15 maxima on each side of the center, where $\theta=0^\circ$. The fringes near the center are more sinusoidal because there the small-angle approximation ($\sin\theta=\theta$) is more applicable. As $b_\lambda=15$, $\lambda/b=1/15 \sim 4^\circ$ which is the angular separation between successive lobes.
+The fringes oscillate around a zero mean and there are exactly 15 maxima on each side of the center, where $\theta=0^\circ$. The fringes near the center are more sinusoidal because there the small-angle approximation ($\sin\theta=\theta$) is more applicable. As $b_\lambda=15$, $\lambda/b=1/15 \sim 4^\circ$ which is the angular separation between successive lobes. The //fringe spacing// increases away from the center because the projected baseline $b\cos\theta$ decreases.