Abe, Marc

Following the 3 maps measurements we performed again the bulk calibration where this time we moved the imagining unit by 0.32 mm in order to compensate the thickness difference between surface and bulk reference samples. We got the following result (also see last figure of this entry) :

AC_bulkref = 0.0731;
DC_bulkref = 4.164;
ACDC = 0.01755;
P_in = 29.5e-3;
P_t = 13.3e-3;
T_bulkref = P_t/P_in;
abs_bulkref = 1.04;
R_bulk = AC_bulkref/(DC_bulkref*sqrt(T_bulkref)*P_in*abs_bulkref) = 0.852 cm/W

Using this new calibration factor and using :

P_t = 6.25 W;
P_in = 7.322 W;

the absorption of this sample seems to be around 60 ppm/ cm for all 3 maps (see attached figures)

Today we will double check the bulk calibration as the change was quite larger than expected.