Feb 25, 2010 #1 H harryd Member level 1 Joined Nov 22, 2009 Messages 38 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,286 Activity points 1,549 laser diode problem i need to find out the beam width using the knife edge technique , so i need find out what type of detector should be used in the experiment and why ?
laser diode problem i need to find out the beam width using the knife edge technique , so i need find out what type of detector should be used in the experiment and why ?
Feb 25, 2010 #2 K karesz Advanced Member level 5 Joined Apr 13, 2008 Messages 2,328 Helped 327 Reputation 654 Reaction score 52 Trophy points 1,328 Location EU Activity points 14,592 laser diode problem Hi, Your detector must have sensitivity at the desired wavelength & speed for the pulsing, than applicable packaging... K.
laser diode problem Hi, Your detector must have sensitivity at the desired wavelength & speed for the pulsing, than applicable packaging... K.
Feb 25, 2010 #3 H harryd Member level 1 Joined Nov 22, 2009 Messages 38 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,286 Activity points 1,549 Re: laser diode problem would a simple photo diode do the trick ?
Feb 25, 2010 #4 K karesz Advanced Member level 5 Joined Apr 13, 2008 Messages 2,328 Helped 327 Reputation 654 Reaction score 52 Trophy points 1,328 Location EU Activity points 14,592 laser diode problem Whats your wavelength and power pls?
Feb 26, 2010 #5 H harryd Member level 1 Joined Nov 22, 2009 Messages 38 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,286 Activity points 1,549 well i am using a simple laser point so thats about 630 nm and 2mw i think . anyways, i think i will just use a simple photodiode.
well i am using a simple laser point so thats about 630 nm and 2mw i think . anyways, i think i will just use a simple photodiode.
Feb 26, 2010 #6 K karesz Advanced Member level 5 Joined Apr 13, 2008 Messages 2,328 Helped 327 Reputation 654 Reaction score 52 Trophy points 1,328 Location EU Activity points 14,592 Or you can take in these case a simple Photoresistor too... I think is the indication some easyer K.
Mar 3, 2010 #7 H harryd Member level 1 Joined Nov 22, 2009 Messages 38 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,286 Activity points 1,549 ok i am using a transistor, i need a circuit for the transistor to detect the a red light from a laser pointer. i also need to know how to calculate the resistance required for the circuit etc... thanks in advance
ok i am using a transistor, i need a circuit for the transistor to detect the a red light from a laser pointer. i also need to know how to calculate the resistance required for the circuit etc... thanks in advance
Mar 3, 2010 #8 K karesz Advanced Member level 5 Joined Apr 13, 2008 Messages 2,328 Helped 327 Reputation 654 Reaction score 52 Trophy points 1,328 Location EU Activity points 14,592 Hi, Maybe their helps; www.tpub.com/neets/book7/26g.htm Light Detector Circuits: www.discovercircuits.com/DJ-Circuits/light-det-circuits.htm www.faqs.org/patents/app/20090108176 www.evilmadscientist.com/article.php/nightlight Photodetector circuit with BP103 Phototransistor Siemens: www.free-circuit.com/photodetector-circuit-with-bp103-phototransistor-siemens/ Photo Sensor Application Note: www.marktechopto.com/Engineering-Services/photo-sensor-application-note.cfm K.
Hi, Maybe their helps; www.tpub.com/neets/book7/26g.htm Light Detector Circuits: www.discovercircuits.com/DJ-Circuits/light-det-circuits.htm www.faqs.org/patents/app/20090108176 www.evilmadscientist.com/article.php/nightlight Photodetector circuit with BP103 Phototransistor Siemens: www.free-circuit.com/photodetector-circuit-with-bp103-phototransistor-siemens/ Photo Sensor Application Note: www.marktechopto.com/Engineering-Services/photo-sensor-application-note.cfm K.