Add powermeter

cfg/terascan.cfg

@@ -1,6 +1,6 @@
 global:
     # list of modules to load when starting
-    startup_modules: [photon_counts_time_average_gui, terascan_gui]
+    startup_modules: [photon_counts_time_average_gui, powermeter_gui, terascan_gui]
 
     # Module server configuration for accessing qudi GUI/logic/hardware modules from remote clients
     remote_modules_server:
@@ -44,6 +44,11 @@ gui:
             swabian_timetagger: 'swabian_timetagger'
         options:
             ring_buffer_length_s: 5
+
+    powermeter_gui:
+        module.Class: 'powermeter.powermeter_gui.PowermeterGui'
+        connect:
+            powermeter_logic: powermeter_logic
 
 logic:
     terascan_logic:
@@ -59,6 +64,11 @@ logic:
             mode_hop_overlap_med: 0.001 # in nm, from the SolsTiS control panel. This is how far back we go to discard data every time a mode hop occurs
             mode_hop_overlap_fine: 0.00025 # ""
 
+    powermeter_logic:
+        module.Class: 'powermeter.powermeter_logic.PowermeterLogic'
+        connect:
+            powermeter: powermeter_thorlabs
+
     # daq_reader_logic:
     #     module.Class: 'common.daq_reader_logic.DAQReaderLogic'
     #     connect:
@@ -117,6 +127,12 @@ hardware:
             host_ip_addr: '192.168.1.225' # IP address of control computer
             laser_ip_addr: '192.168.1.222' # IP address of laser
             laser_port: 39900 # Port number to connect on
+
+    powermeter_thorlabs:
+        module.Class: 'powermeter.thorlabs_power_meter.ThorlabsPowerMeter'
+        options:
+            average_count: 5
+            update_period: 100  # in ms, hardware will emit data ~10 times/second
 
     # Dummy Hardware:
     # daq_reader_dummy:

src/qudi/gui/powermeter/powermeter_gui.py

@@ -0,0 +1,53 @@
+from PySide2 import QtCore
+from qudi.core.module import GuiBase
+from qudi.core.connector import Connector
+from qudi.core.statusvariable import StatusVar
+
+from .powermeter_main_window import PowermeterMainWindow
+
+class PowermeterGui(GuiBase):
+    """
+    GUI module to display power meter readings with a multiplication factor.
+    
+    Example config:
+        powermeter_gui:
+            module.Class: 'powermeter.powermeter_gui.PowermeterGui'
+            connect:
+                powermeter_logic: powermeter_logic
+    """
+    # Connector to the logic module (which emits power readings)
+    _powermeter_logic = Connector(name='powermeter_logic', interface='PowermeterLogic')
+    # StatusVar to store the multiplication factor between sessions
+    _multiplication_factor = StatusVar(name='multiplication_factor', default=1.0)
+
+    def on_activate(self):
+        self._mw = PowermeterMainWindow()
+        # Initialize the main window's multiplication factor from the status variable.
+        self._mw.set_multiplication_factor(self._multiplication_factor)
+        # Set the spinbox value accordingly.
+        self._mw.mult_factor_spinbox.setValue(self._multiplication_factor)
+        # Connect spinbox changes to our handler.
+        self._mw.mult_factor_spinbox.valueChanged.connect(self._on_mult_factor_changed)
+        # Connect logic's power update signal to the main window update slot.
+        self._powermeter_logic().sigPowerUpdated.connect(
+            self._mw.update_power, QtCore.Qt.QueuedConnection
+        )
+        self.show()
+
+    def on_deactivate(self):
+        self._powermeter_logic().sigPowerUpdated.disconnect(self._mw.update_power)
+        self._mw.mult_factor_spinbox.valueChanged.disconnect(self._on_mult_factor_changed)
+        self._mw.close()
+
+    def show(self):
+        self._mw.show()
+        self._mw.raise_()
+
+    @QtCore.Slot(float)
+    def _on_mult_factor_changed(self, factor: float):
+        """
+        Slot called when the multiplication factor is changed via the spinbox.
+        Updates the StatusVar and informs the main window.
+        """
+        self._multiplication_factor = factor
+        self._mw.set_multiplication_factor(factor)

src/qudi/gui/powermeter/powermeter_main_window.py

@@ -0,0 +1,102 @@
+from PySide2 import QtWidgets, QtCore, QtGui
+
+class PowermeterMainWindow(QtWidgets.QMainWindow):
+    """
+    Main window for displaying the Thorlabs Power Meter reading.
+    Features:
+      - Automatic unit conversion.
+      - A multiplication factor control (for correcting losses) in the lower right,
+        where the user types in the value (no increment arrows).
+      - Dynamic font scaling: as the window is resized, the power reading text scales.
+    """
+    def __init__(self, parent=None):
+        super().__init__(parent)
+        self.setWindowTitle('Thorlabs Power Meter')
+        self.resize(400, 180)
+
+        # Initialize multiplication factor (default 1.0)
+        self._mult_factor = 1.0
+
+        # Set up central widget and main layout
+        central_widget = QtWidgets.QWidget()
+        self.setCentralWidget(central_widget)
+        main_layout = QtWidgets.QVBoxLayout(central_widget)
+        main_layout.setContentsMargins(10, 10, 10, 10)
+        main_layout.setSpacing(5)
+
+        # Create power reading label with initial font
+        self.power_label = QtWidgets.QLabel("--", self)
+        self.power_label.setAlignment(QtCore.Qt.AlignCenter)
+        initial_font = QtGui.QFont("Arial", 24)
+        self.power_label.setFont(initial_font)
+        main_layout.addWidget(self.power_label)
+
+        # Add a stretch to push the following controls to the bottom
+        main_layout.addStretch()
+
+        # Create a horizontal layout for the multiplication factor controls
+        h_layout = QtWidgets.QHBoxLayout()
+        h_layout.addStretch()  # Pushes items to the right side
+
+        self.mult_factor_label = QtWidgets.QLabel("Multiplication Factor:", self)
+        self.mult_factor_spinbox = QtWidgets.QDoubleSpinBox(self)
+        self.mult_factor_spinbox.setDecimals(4)
+        self.mult_factor_spinbox.setRange(0.0, 1000.0)
+        self.mult_factor_spinbox.setSingleStep(0.1)
+        # Remove the up/down arrows so the user types the value
+        self.mult_factor_spinbox.setButtonSymbols(QtWidgets.QAbstractSpinBox.NoButtons)
+        self.mult_factor_spinbox.setValue(self._mult_factor)
+
+        h_layout.addWidget(self.mult_factor_label)
+        h_layout.addWidget(self.mult_factor_spinbox)
+        main_layout.addLayout(h_layout)
+
+    @QtCore.Slot(float)
+    def update_power(self, power: float):
+        """
+        Update the label text with the new power reading.
+        The raw power (in Watts) is multiplied by the multiplication factor, then
+        converted into a suitable unit (pW, nW, µW, mW, or W).
+        """
+        corrected_power = power * self._mult_factor
+        abs_pwr = abs(corrected_power)
+
+        if abs_pwr < 1e-12:
+            display_val = corrected_power
+            display_unit = "W"
+        elif abs_pwr < 1e-9:
+            display_val = corrected_power * 1e12
+            display_unit = "pW"
+        elif abs_pwr < 1e-6:
+            display_val = corrected_power * 1e9
+            display_unit = "nW"
+        elif abs_pwr < 1e-3:
+            display_val = corrected_power * 1e6
+            display_unit = "µW"
+        elif abs_pwr < 1:
+            display_val = corrected_power * 1e3
+            display_unit = "mW"
+        else:
+            display_val = corrected_power
+            display_unit = "W"
+
+        self.power_label.setText(f"{display_val:.4f} {display_unit}")
+
+    def set_multiplication_factor(self, factor: float):
+        """
+        Update the multiplication factor.
+        """
+        self._mult_factor = factor
+
+    def resizeEvent(self, event):
+        """
+        Dynamically scale the font size of the power reading label based on the
+        available width of the central widget.
+        Adjust the divisor (here, 10) to fine-tune scaling.
+        """
+        available_width = self.centralWidget().width()
+        new_font_size = max(12, int(available_width / 8))
+        font = self.power_label.font()
+        font.setPointSize(new_font_size)
+        self.power_label.setFont(font)
+        super().resizeEvent(event)