diff --git a/esbo_etc/classes/sensor/ASensor.py b/esbo_etc/classes/sensor/ASensor.py
new file mode 100644
index 0000000..1cd727b
--- /dev/null
+++ b/esbo_etc/classes/sensor/ASensor.py
@@ -0,0 +1,54 @@
+from ..IRadiant import IRadiant
+import astropy.units as u
+from abc import abstractmethod
+
+
+class Sensor:
+    """
+    Abstract super class for sensor models
+    """
+    def __init__(self, parent: IRadiant):
+        """
+        Initialize a new sensor
+
+        Parameters
+        ----------
+        parent : IRadiant
+            The parent element of the optical component from which the electromagnetic radiation is received
+        """
+        self._parent = parent
+
+    @abstractmethod
+    @u.quantity_input(exp_time="time")
+    def getSNR(self, exp_time: u.Quantity):
+        """
+        Calculate the signal to noise ratio (SNR) for the given exposure time.
+
+        Parameters
+        ----------
+        exp_time : time-Quantity
+            The exposure time to calculate the SNR for.
+
+        Returns
+        -------
+        snr : float
+            The calculated SNR
+        """
+        pass
+
+    @abstractmethod
+    def getExpTime(self, snr: float):
+        """
+        Calculate the necessary exposure time in order to achieve the given SNR.
+
+        Parameters
+        ----------
+        snr : float
+            The SNR for which the necessary exposure time shall be calculated.
+
+        Returns
+        -------
+        exp_time : Quantity
+            The necessary exposure time in seconds.
+        """
+        pass