Added to and from json.

src/nqrduck_spectrometer/measurement.py

@@ -1,4 +1,5 @@
 import logging
+import numpy as np
 from nqrduck.helpers.signalprocessing import SignalProcessing as sp
 
 logger = logging.getLogger(__name__)
@@ -25,6 +26,29 @@ class Measurement():
         self.fdx, self.fdy = sp.fft(tdx, tdy, frequency_shift)
         self.IF_frequency = IF_frequency
 
+    # Data saving and loading
+
+    def to_json(self):
+        """Converts the measurement to a json-compatible format."""
+        return {
+            "tdx": [[x.real, x.imag] for x in self.tdx], # Convert complex numbers to list
+            "tdy": [[x.real, x.imag] for x in self.tdy], # Convert complex numbers to list
+            "target_frequency": self.target_frequency,
+            "IF_frequency": self.IF_frequency
+        }
+    
+    @classmethod
+    def from_json(cls, json):
+        """Converts the json format to a measurement."""
+        tdx = np.array([complex(x[0], x[1]) for x in json["tdx"]])
+        tdy = np.array([complex(y[0], y[1]) for y in json["tdy"]])
+        return cls(
+            tdx,
+            tdy,
+            json["target_frequency"],
+            json["IF_frequency"]
+        )
+
     # Measurement data
     @property
     def tdx(self):