added loopscan_bool option, helper function for the scanning loop and implemented the possible loopscan logic conditional in the scanning loop

20240709SerdarModScript.py

@@ -8,6 +8,7 @@ Lightfield + Positioner
 # Packages from Ryan
 import re
 import pyvisa
+import threading
 # from pyvisa import ResourceManager, constants
 
 # B Field Limits (in T)
@@ -31,6 +32,7 @@ from System import String
 import numpy as np
 import matplotlib.pyplot as plt
 import datetime
+from typing import Union
 
 
 #First choose your controller
@@ -351,19 +353,22 @@ def write_no_echo(instr:pyvisa.resources.Resource, command:str, sleeptime=0.01)-
     except pyvisa.VisaIOError as e:
         print(f"Error communicating with instrument: {e}")
 
-# TODO: implement the reverse scan and zero when finish functionality 
 # receive values in units of T, rescale in kg to talk with the power supplyy. 1T = 10kG
+# NOTE: removed singlepowersupply_bool, reading serial-nr. of the device instead.
+# TODO: add a param to allow the 
 def sweep_b_val(instr:pyvisa.resources.Resource, min_bval:float, max_bval:float, 
-                res:float, Settings:str, base_file_name='', path_save="C:/Users/localadmin/Desktop/Users/Lukas/2024_02_08_Map_test",
+                res:float, magnet_coil:str, Settings:str, base_file_name='', path_save="C:/Users/localadmin/Desktop/Users/Lukas/2024_02_08_Map_test",
-                singlepowersupply_bool=False, reversescan_bool=False, zerowhenfin_bool=False)->None:
+                reversescan_bool=False, zerowhenfin_bool=False, loopscan_bool=False)->None:
-    """ this function performs a sweep of the B field of the chosen magnet coil. It creates a list o B values from the given min and max values, with the given resolution. For each value, a measurement of the spectrum
+    # TODO: update docs in the end
-    of the probe in the cryostat is made, using the LightField spectrometer.
+    """ this function performs a sweep of the B field of the chosen magnet coil. It creates a list o B values from the given min and max values,
+    with the given resolution. For each value, a measurement of the spectrum of the probe in the cryostat is made, using the LightField spectrometer.
 
     Args:
         instr (pyvisa.resources.Resource): chosen power supply device to connect to
         min_bval (float): min B value of the scan (please input in units of Tesla)
         max_bval (float): max B value of the scan (please input in units of Tesla)
         res (float): resolution of the list of B values (please input in units of Tesla)
+        magnet_coil (str): select magnet coil to be used. String should be 'x-axis','y-axis' or 'z-axis'.
         Settings (str): experiment settings, included in file name.
         base_file_name (str, optional): base file name. Defaults to ''.
         path_save (str, optional): file path where the file will be saved. Defaults to "C:/Users/localadmin/Desktop/Users/Lukas/2024_02_08_Map_test".
@@ -375,31 +380,69 @@ def sweep_b_val(instr:pyvisa.resources.Resource, min_bval:float, max_bval:float,
         ValueError: when By limit is exceeded.
         ValueError: when Bz limit is exceeded.
         ValueError: when Bx limit is exceeded.
+        ConnectionError: when no device is connected.
     """    ''''''
+    def pyramid_list(lst) -> Union[list, np.ndarray]:
+        """reverses the list and removes the first element of reversed list. Then, this is appended to
+        the end of the original list and returned as the 'pyramid' list.
+
+        Args:
+            lst (list or np.ndarray): 
+        Raises:
+            TypeError: if the input object isn't a list or np.ndarray
+        Returns:
+            Union[list, np.ndarray]: the pyramid list
+        """    ''''''
+        if isinstance(lst, list):
+            return lst + lst[-2::-1]
+        elif isinstance(lst, np.ndarray):
+            return np.append(lst, lst[-2::-1])
+        else:
+            raise TypeError('Please input a list!')
+    
     if base_file_name =='':
         base_file_name = datetime.datetime.now().strftime('%Y_%m_%d_%H.%M')
 
-    start_time = time.time()
+    start_time = time.time()  # start of the scan function
+
+    instr_info = query_no_echo(instr, '*IDN?')
+
     instr_bsettings = list(sep_num_from_units(el) for el in query_no_echo(instr, 'UNITS?;LLIM?;ULIM?').split(';'))  # deliver a 3 element tuple of tuples containing the set unit, llim and ulim 
 
     if instr_bsettings[0][0] == 'T':
         instr_bsettings[1][0] = instr_bsettings[1][0]*0.1  # rescale kG to T, device accepts values only in kG or A, eventho we set it to T
         instr_bsettings[2][0] = instr_bsettings[2][0]*0.1
 
-    if singlepowersupply_bool:  # checks limits of By
+    # if singlepowersupply_bool:  # checks limits of Bx or By
+    #     if (min_bval< -BY_MAX) or (max_bval > BY_MAX):
+    #         raise ValueError('Input limits exceed that of the magnet By! Please input smaller limits.')
+    # elif '1' in query_no_echo(instr, 'CHAN?'):  # check if its the coils for Bz
+    #     if (min_bval < -BZ_MAX) or (max_bval > BZ_MAX):
+    #         raise ValueError('Input limits exceed that of the magnet (Bz)! Please input smaller limits.')
+    # else:  # checks limits of Bx
+    #     if (min_bval< -BX_MAX) or (max_bval > BX_MAX):
+    #         raise ValueError('Input limits exceed that of the magnet Bx! Please input smaller limits.')
+ 
+    if '2101014' in instr_info and (magnet_coil=='y-axis'):  # single power supply
         if (min_bval< -BY_MAX) or (max_bval > BY_MAX):
             raise ValueError('Input limits exceed that of the magnet By! Please input smaller limits.')
-    elif '1' in query_no_echo(instr, 'CHAN?'):  # check if its the coils for Bz
+    elif '2301034' in instr_info:  # dual power supply
-        if (min_bval < -BZ_MAX) or (max_bval > BZ_MAX):
+        if magnet_coil=='z-axis':  # check if its the coils for Bz
-            raise ValueError('Input limits exceed that of the magnet (Bz)! Please input smaller limits.')
+            if (min_bval < -BZ_MAX) or (max_bval > BZ_MAX):
-    else:  # checks limits of Bx
+                raise ValueError('Input limits exceed that of the magnet (Bz)! Please input smaller limits.')
-        if (min_bval< -BX_MAX) or (max_bval > BX_MAX):
+            write_no_echo(instr, 'CHAN 1')
-            raise ValueError('Input limits exceed that of the magnet Bx! Please input smaller limits.')
+        elif magnet_coil=='x-axis':  # checks limits of Bx
+            if (min_bval< -BX_MAX) or (max_bval > BX_MAX):
+                raise ValueError('Input limits exceed that of the magnet Bx! Please input smaller limits.')
+            write_no_echo(instr, 'CHAN 2')
+    else:
+        raise ConnectionError('Device is not connected!')
 
     write_no_echo(instr, f'LLIM {min_bval*10};ULIM {max_bval*10}')  # sets the given limits, must convert to kG for the device to read
     bval_lst = np.arange(min_bval, max_bval + res, res)  # creates list of B values to measure at, with given resolution, in T
 
-    init_bval = sep_num_from_units(query_no_echo(instr, 'IMAG?'))[0]*0.1  # queries the initial B value of the coil, rescale from kG to T
+    # TODO: unused, see if can remove
+    # init_bval = sep_num_from_units(query_no_echo(instr, 'IMAG?'))[0]*0.1  # queries the initial B value of the coil, rescale from kG to T
 
     init_lim, subsequent_lim = 'LLIM', 'ULIM'
     init_sweep, subsequent_sweep = 'DOWN', 'UP'
@@ -417,24 +460,18 @@ def sweep_b_val(instr:pyvisa.resources.Resource, min_bval:float, max_bval:float,
         init_lim, subsequent_lim = subsequent_lim, init_lim
         init_sweep, subsequent_sweep = subsequent_sweep, init_sweep
 
+    if loopscan_bool:
+        bval_lst = pyramid_list(bval_lst)
+
     total_points = len(bval_lst)
+    middle_index_bval_lst = total_points // 2 
     intensity_data = []  # To store data from each scan
     cwd = os.getcwd() # save original directory
-    
-    #This gives a directory, in which the script will save the spectrum of each spot as spe
-    #However, it will open the spectrum, convert it to txt, add it to the intensity_data and delete the spe file
-    #scanning loop
-    for i, bval in enumerate(bval_lst):
 
-        # if init_bval == bval:
+    # NOTE: helper function for the scanning loop
-        #     # if initial bval is equal to the element of the given iteration from the bval_lst, then commence measuring the spectrum
+    def helper_scan_func(idx, bval, instr=instr, init_lim=init_lim, init_sweep=init_sweep,
-        #     pass
+                         subsequent_lim=subsequent_lim, subsequent_sweep=subsequent_sweep, sleep=5):
-        # else:
+        if idx == 0:  # for first iteration, sweep to one of the limits 
-
-        # TODO: improve the conditional block later on... try to shorten the number of conditionals needed/flatten the nested conditionals
-        # else, travel to the lower or higher limit, depending on how far the init val is to each bound, and commence the measurement from there on
-        # if not reversescan_bool:
-        if i == 0:  # for first iteration, sweep to one of the limits 
             write_no_echo(instr, f'{init_lim} {bval*10}')  # convert back to kG
             write_no_echo(instr, f'SWEEP {init_sweep}')
         else:
@@ -449,6 +486,40 @@ def sweep_b_val(instr:pyvisa.resources.Resource, min_bval:float, max_bval:float,
             actual_bval = sep_num_from_units(query_no_echo(instr, 'IMAG?'))[0]*0.1 
                 # update the actual bval
             print(f'Actual magnet strength: {actual_bval} T,', f'Target magnet strength: {bval} T')
+    
+    #scanning loop
+    for i, bval in enumerate(bval_lst):
+        # if init_bval == bval:
+        #     # if initial bval is equal to the element of the given iteration from the bval_lst, then commence measuring the spectrum
+        #     pass
+        # else:
+
+        # NOTE: original code without the loop scan
+        ################################################
+        # if i == 0:  # for first iteration, sweep to one of the limits 
+        #     write_no_echo(instr, f'{init_lim} {bval*10}')  # convert back to kG
+        #     write_no_echo(instr, f'SWEEP {init_sweep}')
+        # else:
+        #     write_no_echo(instr, f'{subsequent_lim} {bval*10}')  # convert back to kG
+        #     write_no_echo(instr, f'SWEEP {subsequent_sweep}')
+
+        # actual_bval = sep_num_from_units(query_no_echo(instr, 'IMAG?'))[0]*0.1  # convert kG to T
+        # print(f'Actual magnet strength: {actual_bval} T,', f'Target magnet strength: {bval} T')
+
+        # while abs(actual_bval - bval) > 0.0001:
+        #     time.sleep(5)  # little break
+        #     actual_bval = sep_num_from_units(query_no_echo(instr, 'IMAG?'))[0]*0.1 
+        #         # update the actual bval
+        #     print(f'Actual magnet strength: {actual_bval} T,', f'Target magnet strength: {bval} T')
+        ###############################################
+        if not loopscan_bool:
+            helper_scan_func(i, bval)
+        else:
+            if i <= middle_index_bval_lst:
+                helper_scan_func(i, bval)
+            else:
+                helper_scan_func(i, bval, instr=instr, init_lim=subsequent_lim, init_sweep=subsequent_sweep,
+                            subsequent_lim=init_lim, subsequent_sweep=init_sweep, sleep=5)
         
         time.sleep(5)
         # we acquire with the LF 
@@ -476,6 +547,8 @@ def sweep_b_val(instr:pyvisa.resources.Resource, min_bval:float, max_bval:float,
     elapsed_time = (end_time - start_time) / 60
     print('Scan time: ', elapsed_time, 'minutes')
 
+    write_no_echo(instr, f'LLIM {instr_bsettings[1][0]*10};ULIM {instr_bsettings[2][0]*10}')  # reset the initial limits of the device after the scan
+
     if zerowhenfin_bool:
         write_no_echo(instr, 'SWEEP ZERO')  # if switched on, discharges the magnet after performing the measurement loop above
     
@@ -514,8 +587,9 @@ powerbox_dualsupply = rm.open_resource('ASRL8::INSTR',
 
 write_no_echo(powerbox_dualsupply, 'REMOTE')  # turn on the remote mode
 
+# TODO: test functionality of the magnet_coil param later on, should work... as this code below is basically implemented inside the scan func.
 # select axis for the dual supply, either z-axis(CHAN 1 ^= Supply A) or x-axis(CHAN 2 ^= Supply B)
-write_no_echo(powerbox_dualsupply, 'CHAN 1')
+# write_no_echo(powerbox_dualsupply, 'CHAN 1')
 
 # Setup connection to AMC
 amc = AMC.Device(IP)
@@ -550,17 +624,13 @@ experiment_settings = 'PL_SP_700_LP_700_HeNe_52muW_exp_2s_Start_'
 #The program adds the range of the scan as well as the resolution and the date and time of the measurement
 experiment_name = f"{set_llim_bval}T_to_{set_ulim_bval}T_{set_res_bval}T_{datetime.datetime.now().strftime('%Y_%m_%d_%H%M')}"
 
-# # TODO: write the bval scan here
-# for idx, bval in enumerate(bval_lst):
-#     write_no_echo(powerbox_dualsupply, '')
-
 # this moves the probe in xy-direction and measures spectrum there
 # move_scan_xy(range_x, range_y, resolution, experiment_settings, experiment_name)
 
 # perform the B-field measurement for selected axis above
 # sweep_b_val(powerbox_dualsupply, set_llim_bval, set_ulim_bval, set_res_bval, experiment_settings, experiment_name)
-sweep_b_val(powerbox_dualsupply, set_llim_bval, set_ulim_bval, set_res_bval, 
+sweep_b_val(powerbox_dualsupply, set_llim_bval, set_ulim_bval, set_res_bval, 'z-axis',
-            experiment_settings, experiment_name, singlepowersupply_bool=False, zerowhenfin_bool=True, reversescan_bool=False)
+            experiment_settings, experiment_name, zerowhenfin_bool=True, reversescan_bool=False)
 
 # Internally, axes are numbered 0 to 2