12/24/2023 0 Comments Vesper simplenote nvalt![]() After recording the light spatial distribution image, the CCD camera is removed and the BGA is put in the soldering plane. Then the beam is applied to the BGA, and by means of a thermography camera ThermaCAM E25 from Flir TM systems, the thermal distribution in the BGA is obtained. The experimental setup mounted on an optical table is shown in figure 5. R ESULTS In order to confirm the theoretically calculated light spot horizontal and vertical lengths D FT at the BGA location in the proposed optical setups for FILSS, the light spots were captured by means of a CCD camera. The images that were captured are shown in figure 6. For figure 6(d), the center square of homogenized superimposed beamlets was calculated by means of Eq. (2), obtaining 15.38 x 11.53 mm horizontal and vertical D FT lengths, respectively, for the parameters of P LA1 = 4 (horizontal) x 3 (vertical) mm, f FL = 150 mm, f LA1 = f LA2 = 38.1 mm, and a 12 = 39 mm. The measured lengths of the light spot shown in figure 6(d) are 15.37 x 11.53 mm, which are in agreement with the theoretical calculation. The main results presented in this paper are the temperature distributions measured at the surface area of a 35x35 mm BGA, for each of the proposed optical setups for FILSS. In order to obtain these temperature distributions, the reflow soldering temperature profile was applied to the BGA for each of the proposed optical setups for FILSS. The captured thermal images are shown in figure 7.īy means of measuring the temperature distribution on the surface area of the BGA with an IR thermography camera, thermal images were captured at the peak temperature stage of the reflow soldering profile, in order to analyze the soldering capacity for each of the proposed optical setups for FILSS. The thermal images analysis gives a peak temperature of 241 ° C reached in the basic optical setup for FILSS, as can be seen in figure 7(a). This episode of The Talk Show was edited by Caleb Sexton.This peak temperature is enough to melt lead free solder (~217 ° C for commonly used SnAgCu solder alloy), which is a main performance parameter to be obtained in the proposed optical setups for FILSS. PredictIt - Website where you can gamble on election and political predictions.Last year’s day-after-the-election “Holiday Party” episode.The Elements of Eloquence - the book that explains the implicit rules of adjective order in English. ![]()
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