From 8ee61713d5a86f8062a1649b3ad876a5b84a3a9e Mon Sep 17 00:00:00 2001
From: Laurent Mercadier <laurent.mercadier@xfel.eu>
Date: Wed, 25 Sep 2019 21:17:11 +0200
Subject: [PATCH] Adds function to convert a delay stage motor position into
 time

---
 Laser_utils.py | 15 +++++++++++++++
 __init__.py    |  1 +
 2 files changed, 16 insertions(+)
 create mode 100644 Laser_utils.py

diff --git a/Laser_utils.py b/Laser_utils.py
new file mode 100644
index 0000000..0af4c88
--- /dev/null
+++ b/Laser_utils.py
@@ -0,0 +1,15 @@
+def positionToDelay(data, key, origin=0, invert = False, reflections=1):
+    ''' converts a motor position in mm into optical delay in picosecond
+        Inputs:
+            data: dataset containing delay stage motor position
+            key: key of the delay stage
+            origin: motor position of time zero in mm
+            invert: bool, inverts the sign of delay if True
+            reflections: number of bounces in the delay stage
+
+        Output:
+            delay in picosecond
+    '''
+    c_ = 299792458 *1e-9 # speed of light in mm/ps
+    x = -1 if invert else 1
+    return 2*reflections*(data[key]-origin)*x/c_
\ No newline at end of file
diff --git a/__init__.py b/__init__.py
index 654b00f..9266141 100644
--- a/__init__.py
+++ b/__init__.py
@@ -2,3 +2,4 @@ from ToolBox.Load import *
 from ToolBox.xgm import *
 from ToolBox.XAS import *
 from ToolBox.knife_edge import *
+from ToolBox.Laser_utils import *
-- 
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