harryd
Member level 1
hi
i am doing an experiment to measure the beam width. my task right now is measure the light coming out from the fiber using a simple common collector ( phototransistor). now , the detector is working because when i apply the laser pointer( 633nm 5mw) on the detecotr it reads around 3 volts. i , also, polished the fiber and it transmits light ( a small red dot is seen at the end of the fiber).
However, when i apply the laser in the fiber and the fiber infront of the detector it doesnt read anything and i mean anything ,abloute zero.
so i concluced one of these 2 solutions:
1- change the laser pointer with a stronger one
2- change the phototransistor with something more sensitive ( suggest plz)
plz help asap
i am doing an experiment to measure the beam width. my task right now is measure the light coming out from the fiber using a simple common collector ( phototransistor). now , the detector is working because when i apply the laser pointer( 633nm 5mw) on the detecotr it reads around 3 volts. i , also, polished the fiber and it transmits light ( a small red dot is seen at the end of the fiber).
However, when i apply the laser in the fiber and the fiber infront of the detector it doesnt read anything and i mean anything ,abloute zero.
so i concluced one of these 2 solutions:
1- change the laser pointer with a stronger one
2- change the phototransistor with something more sensitive ( suggest plz)
plz help asap