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data/photocurrent_data/Information about Si_256 and Si_2_256 datasets.txt

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+1. This is the description of the 2 datasets (4 files in total) of photocurrent mapping of 2 different samples:
+- a 2 cm x 2 cm silicon photovoltaic device (Si_2_256)
+- a 10 cm x 10 cm silicon photovoltaic device (Si_256)
+the devices were measured using NPL's projection based photocurrent mapping measurement system, using Hadamard patterns. the raw measurements acquired are included in the .txt files. The reconstructed current map (100% samples used, no undersampling) is provided in the .txt.map file in each case. 
+
+
+2. The .txt file contains the raw measurements. For each Hadamard order there are two patterns projected on the sample, a positive and a negative pattern, with the photocurrent response measured in each case (in A, Amperes). an example is given below, with comments after the % symbol:
+
+Pattern Index	Measured current (A)
+0.00000000E+0	-7.37760591E-3  %<---- Zero order Hadamard positive pattern
+0.00000000E+0	-1.21208239E-5  %<---- Zero order Hadamard negative pattern
+1.00000000E+0	-3.65906235E-3  %<---- First order Hadamard positive pattern
+-1.00000000E+0	-3.71676451E-3	%<---- First order Hadamard positive pattern
+-2.00000000E+0	-3.42848764E-3	%<---- Second order Hadamard positive pattern
+2.00000000E+0	-3.94105072E-3	%<---- Second order Hadamard positive pattern
+
+these measurements are the raw photocurrent measurements of the sample for each projected pattern. The Hadamard ordering we are using are [Andrew to confirm]
+
+3. Using the raw data, one can reconstruct a current map using the inverse Hadamard transform. The dataset one needs for this is the difference between the positive and the negative pattern each time. 
+
+Hadamard patterns consist of ones and minus ones. Nevertheless, in our projection system we can only project patterns where at each pixel you have light, and no light, negative light does not exist! Hence we project the normal Hadamard pattern with ones and zeros (instead of minus one - positive pattern) and the same pattern but with zeros and ones (inverted - negative pattern). To process the measurements, one would subtract the negative from the positive to get the difference, which is used to reconstruct the map. 
+
+4. Both maps are 256 x 256 pixels
+
+For more information contact:
+George Koutsourakis george.koutsourakis@npl.co.uk
+Andrew Thompson andrew.thompson@npl.co.uk
+James Blakesley james.blakesley@npl.co.uk
+
+

data/photocurrent_data/Si_256.npy

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data/photocurrent_data/Si_256_512x512.npy

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data/photocurrent_data/Si_256_hadamard_measurement_vector.npy

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data/photocurrent_data/Si_2_256.npy

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data/photocurrent_data/example_measurement_data.txt

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+Output from Current mapping V2
+
+Pattern Index	Measured current (A)
+0	            -7.37760591E-3  %<---- Zero order Hadamard positive pattern
+-0	            -1.21208239E-5  %<---- Zero order Hadamard negative pattern
+1	            -3.65906235E-3  %<---- First order Hadamard positive pattern
+-1	            -3.71676451E-3  %<---- First order Hadamard negative pattern
+-2	            -3.42848764E-3  %<---- Second order Hadamard negative pattern
+2	            -3.94105072E-3  %<---- Second order Hadamard positive pattern
+-3	            -3.66897412E-3
+3	            -3.70271425E-3
+-4	            -3.75217006E-3
+4	            -3.62834115E-3
+-5	            -6.29545434E-3
+5	            -1.08624884E-3
+-6	            -3.74282921E-3
+6	            -3.63866788E-3
+-7	            -3.87284080E-3
+7	            -3.50183586E-3
+-8	            -3.56461227E-3
+8	            -3.81642808E-3
+-9	            -3.66546225E-3
+9	            -3.71354506E-3
+10	            -1.54606425E-3
+-10	            -5.81768411E-3
+-11	            -3.68815990E-3
+11	            -3.68544175E-3
+-12	            -3.68479285E-3
+12	            -3.68706818E-3
+13	            -3.59447012E-3
+-13	            -3.77143103E-3
+-14	            -3.64053661E-3
+14	            -3.72985117E-3
+-15	            -2.17455802E-3
+15	            -5.20006015E-3
+...
+...

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data/photocurrent_data/photocurrent_data_description.txt

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+[text here]