Merge branch '93-error-in-unit-documentation-of-test-mass-noise' into 'master'

Resolve "Error in unit documentation of test-mass noise"

Closes #93

See merge request !115

lisainstrument/noises.py

@@ -221,7 +221,7 @@ def ranging(fs, size, asd=3E-9):
 
 
 def testmass(fs, size, asd=2.4E-15, fknee=0.4E-3):
-    """Generate test-mass acceleration noise [ffd].
+    """Generate test-mass acceleration noise [m/s].
 
     Expressed in acceleration, the noise power spectrum reads
 
@@ -229,8 +229,8 @@ def testmass(fs, size, asd=2.4E-15, fknee=0.4E-3):
 
     Multiplying by 1 / (2π f)^2 yields the noise as a velocity,
 
-        S_delta(f) [ffd] = (asd / 2π)^2 [ f^(-2) + (fknee^2 / f^4) ]
-                         = (asd / 2π)^2 f^(-2) + (2 asd fknee / 2π)^2 f^(-4) ].
+        S_delta(f) [m/s] = (asd / 2π)^2 [ f^(-2) + (fknee^2 / f^4) ]
+                         = (asd / 2π)^2 f^(-2) + (2 asd fknee / 2π)^2 f^(-4).
 
     Args:
         asd: amplitude spectral density [ms^(-2)/sqrt(Hz)]
@@ -251,7 +251,7 @@ def oms(fs, size, asd, fknee):
     Multiplying by (2π f / c)^2 to express it as fractional frequency deviations,
 
         S_oms(f) [ffd] = (2π asd / c)^2 [ f^2 + (fknee^4 / f^2) ]
-                      = (2π asd / c)^2 f^2 + (2π asd fknee^2 / c)^2 f^(-2)
+                      = (2π asd / c)^2 f^2 + (2π asd fknee^2 / c)^2 f^(-2).
 
     Note that the level of this noise depends on the interferometer and the type of beatnote.